TL;DR
- Intercom Fin is the best AI chatbot for a website.
- Crisp is the one most readers should actually buy.
- AI rates run from 5.6 cents to 99 cents a conversation.
- Several free tiers ship with the AI switched off.
- Work out cost per conversation before you sign.
Intercom charges 99 cents every time its AI closes a conversation. Crisp charges about five and a half cents every time its AI has one. That is an eighteenfold gap on what looks like the same job, and it is the number that decides this purchase far more than any feature list. Intercom Fin is the best product here and the best-evidenced by a distance. Crisp is the one most people reading this should try first.
Best AI chatbots for websites at a glance
Short on time? Here is the ranked shortlist, with the free tier, the published AI rate where there is one, the entry price and the review score from whichever platform actually carries volume for that vendor.
| Tool | Best for | Free tier | Published AI rate | Entry price | Rating |
|---|---|---|---|---|---|
| Intercom Fin | Best overall | Trial only | 0.99 a resolution | 29 dollars a seat | G2 4.5 (3,907) |
| Crisp | Best value on AI conversations | Yes | about 0.056 a conversation | 45 dollars a workspace | G2 4.5 (202) |
| Tidio | Best for small ecommerce | Yes | Tiered by AI conversation | Free to start | G2 4.6 (1,962) |
| Botpress | Best for developers | 100 conversations | 0.65 then 0.50 a conversation | 150 dollars a month | G2 4.5 (511) |
| Landbot | Best no-code builder | 100 chats | 0.10 euro an AI chat | 32 euro a month | G2 4.7 (334) |
| Chatbase | Best for a bot trained on your own documents | 50 credits | 0.04 a message credit | 40 dollars a month | G2 4.8 (25) |
| Jotform AI Agents | Best free tier for a simple site bot | Yes | Not published | 34 dollars a month | G2 4.5 (778) |
| Chatling | Best cheap all-rounder | Yes | Credit-based | 21 dollars a month | G2 4.7 (78) |
| Voiceflow | Best for design-led CX teams | Trial only | Not published | Not published | G2 4.6 (111) |
| Algomo | Best for pipeline rather than deflection | No | Not published | 200 dollars a month | Product Hunt 5.0 (6) |
What you are actually buying
Two different products are sold under the same phrase. A support agent reads your help centre and answers questions so a human does not have to; success is a ticket that never reaches anyone. A sales agent works out who the visitor is and tries to book something; success is a meeting. Eight of the ten tools below do the first job. Landbot straddles both. Algomo only does the second.
Buying the wrong one is the common and expensive mistake, because the pricing units are built around the intended outcome. A support agent priced per resolution gets more expensive as it gets better at its job. A sales agent priced per month does not care how many conversations it has. Neither model is wrong; they are answers to different questions.
The third thing worth separating is who builds it. Chatbase and Jotform want a URL and some documents. Landbot wants you on a canvas. Botpress and Voiceflow want an engineer or a designer who will own the agent as a product. That choice constrains the price more than the feature comparison does.
How we ranked these
Four criteria, in this order.
- Independent review evidence. Score and volume from the platform that carries the reviews for that vendor, read on 26 August 2026. Where the base is under a hundred, the entry says so, and where it is under thirty the score is reported but not relied on.
- A published AI rate. Four of these ten publish what an AI conversation costs. The rest bundle it into a plan or route you to sales, and that is treated as a mark against them.
- What the free tier actually lets you test. A free live-chat inbox with the AI switched off is not a free AI chatbot, and the table says which is which.
- Whether the price survives contact with a busy month. Seats, credits, extra channels and overage rates, all of which arrive on the invoice and not on the pricing card.
All figures are US dollars unless the vendor prices in euros, as of 25 August 2026. Ranking last on thin evidence is a legitimate outcome and is said out loud where it applies, which is why Algomo sits at the bottom despite being the only tool here aimed at pipeline.
The 10 best AI chatbots for websites
1. Intercom Fin: Best overall
Intercom Fin has the strongest evidence base in this category by a distance, 3,907 G2 reviews at 4.5, and it is the tool the rest are measured against. It is also the only one that charges nothing until the AI actually finishes the job: Fin bills 0.99 dollars per resolution, once per conversation, and a conversation the AI fails to close costs you nothing. Seats are separate, from 29 dollars on Essential up to 132 on Expert, with free Lite seats for people who only need to read. There is no free plan, only a 14-day trial. The economics are covered further down and they are not as unfavourable as 99 cents sounds.
Key details:
- Best for: support teams with real ticket volume who want the AI to close cases, not just deflect them.
- What it does: AI agent across chat, email and messaging, inbox for human agents, Copilot for agents, knowledge base, workflows, reporting.
- Free tier: no. A 14-day free trial. Startups can get up to 93 percent off and a year of Fin free through the Early Stage programme.
- Pricing: Fin AI Agent 0.99 a resolution. Seats: Essential 29 a seat (currently offered at 19), Advanced 85 with 20 free Lite seats, Expert 132 with 50 free Lite seats. Copilot add-on 29 a seat annually or 35 monthly. The Pro add-on is 99 a month and covers 1,000 conversations analysed.
- Rating: G2 4.5 from 3,907 reviews
- Watch for: the resolution meter has no ceiling. At the 50 percent resolution rate Intercom quotes from its own customers, 10,000 conversations a month is roughly 4,950 dollars in Fin charges before a single seat is counted.
Pros
- The largest independent review base in the category, by a wide margin.
- You pay for outcomes, so a conversation the AI cannot close is free.
- Free Lite seats on the higher tiers keep read-only access cheap.
Cons
- No free plan at all, and no published cap on the resolution meter.
- The most expensive published AI rate here, at 99 cents an outcome.
The best product in the category, and the one most likely to surprise you on the invoice.
2. Crisp: Best value on AI conversations
Crisp is the cheapest way to put a competent AI agent on a website, and it is not close. Its plans include AI credits denominated in dollars, and the vendor states how many automated conversations those credits buy: 5 dollars for about 90 on the 45-dollar plan, 25 for about 450 on the 95-dollar plan, 75 for about 1,350 on the 295-dollar plan. Those three pairs all work out to the same rate, a little under 5.6 cents per automated conversation. Pricing is also per workspace rather than per seat, which is unusual here and matters for a team of five. The evidence base is thinner, 202 G2 reviews against Intercom’s 3,907.
Key details:
- Best for: small teams that want an AI agent and a shared inbox without a per-seat bill.
- What it does: omnichannel inbox, AI agent (Hugo), chatbot workflows, campaigns, knowledge base, CRM, Shopify and WooCommerce sync.
- Free tier: yes, though it carries no AI credits. The AI starts on the paid plans.
- Pricing: Mini 45 a month per workspace with 5 dollars of AI credits. Essentials 95 with 25 dollars of credits. Plus 295 with 75 dollars of credits. Enterprise is quoted. 14-day trial on any plan.
- Rating: G2 4.5 from 202 reviews
- Watch for: the free plan has no AI credits at all, so the free tier is a live-chat inbox rather than a chatbot.
Pros
- Roughly 5.6 cents per automated conversation, the cheapest published rate here.
- Priced per workspace, not per seat, so adding people costs nothing.
- Five channels and a knowledge base included at the entry tier.
Cons
- No AI on the free plan, so you cannot test the agent without paying.
- Two hundred reviews is a fraction of the evidence behind Intercom or Tidio.
The value pick, and the one most readers of this article should try first.
3. Tidio: Best for small ecommerce
Tidio sells Lyro, an AI agent aimed squarely at online shops, and it is the second most reviewed tool here at 1,962 G2 reviews and the highest scoring of the three big ones at 4.6. Pricing works on two separate meters that you set independently: billable conversations for the human inbox, stepping from 50 to over 2,000 a month, and Lyro AI conversations, stepping from 50 to over 1,000. That means you can run a lot of human chat and very little AI, or the reverse, without paying for both. Annual billing gives two months free.
Key details:
- Best for: Shopify and WooCommerce stores that want order questions answered without a human.
- What it does: live chat, Lyro AI agent trained on your content, flows, ticketing, product cards in chat, email and Messenger channels.
- Free tier: yes, free to start, with the AI conversation meter set to zero until you choose a Lyro tier.
- Pricing: two independent meters. Billable conversations at 50, 100, 250, 400, 600, 800, 1,000, 1,500, 2,000 and above per month. Lyro AI conversations at 50, 100, 150, 200, 300, 500, 750, 1,000 and above. Annual billing gives 2 months free. Custom plans above the top tiers.
- Rating: G2 4.6 from 1,962 reviews
- Watch for: two meters means two ways to run out. A busy month can exhaust the Lyro allowance while the human inbox tier still has room, and the agent stops.
Pros
- Second-largest review base here and the highest score of the three biggest tools.
- AI and human conversation volumes are metered separately.
- Built around ecommerce, with order lookups and product cards in the chat.
Cons
- Two meters make the monthly total harder to predict than a flat plan.
- Aimed at retail, so B2B use cases get less of the product.
The default for an online shop, and the safest big-name alternative to Intercom.
4. Botpress: Best for developers
Botpress is the builder’s option: agents that take real actions on refunds, account updates and multi-step workflows rather than answering from a document. It publishes the clearest conversation pricing of anyone here. The Plus plan is 150 a month for 250 conversations, with extra packs of 100 at 65 dollars, which is 65 cents a conversation. The Team plan is 750 for 1,500, with packs of 100 at 50, so 50 cents. AI model usage is included up to 25 dollars on Plus and 150 on Team, then metered. The free plan gives 100 conversations, which is enough to build and test something real.
Key details:
- Best for: teams with a developer who want the agent to do things, not just say things.
- What it does: visual and code-first agent building, tool calling and actions, knowledge bases, help centre with custom domain, human handoff, multi-channel deployment.
- Free tier: yes: 100 conversations a month.
- Pricing: Plus 150 a month with 250 conversations, extra packs of 100 at 65, and 25 dollars of AI usage included. Team 750 a month with 1,500 conversations, packs of 100 at 50, and 150 dollars of AI usage. Enterprise is quoted, with a resolution SLA.
- Rating: G2 4.5 from 511 reviews
- Watch for: the conversation packs get cheaper as you climb, so the effective rate on Plus is 30 percent worse than on Team for exactly the same conversation.
Pros
- Publishes a plain per-conversation rate, which most of this category does not.
- Agents take actions rather than only retrieving answers.
- One hundred free conversations is enough to build something and see it work.
Cons
- You need engineering time to get the value out of it.
- Model usage is metered on top of the conversation packs.
The right pick when the bot has to change something in another system.
5. Landbot: Best no-code builder
Landbot is the strongest visual builder in this list, with a drag-and-drop canvas that a marketer can use without help, and the highest G2 score of any tool here with more than a hundred reviews, 4.7 across 334. It splits chats into two kinds and prices them separately: ordinary rule-based chats at 5 cents each beyond the plan allowance, and AI chats at 10 cents. The free plan gives 100 chats a month and no AI chats at all, which makes it a decent way to build the flow before deciding whether the AI is worth paying for.
Key details:
- Best for: marketers who want to design the conversation themselves and see it on a canvas.
- What it does: no-code conversational builder for web and WhatsApp, AI agents, lead qualification, handoff to live chat, integrations.
- Free tier: yes, free forever: 100 chats a month, no AI chats included, no card, no expiry.
- Pricing: Starter 32 euro a month billed annually (40 monthly) for 500 chats and 100 AI chats. Professional 80 euro annually (100 monthly) for 2,500 chats and 300 AI chats. Extra chats 0.05 euro, extra AI chats 0.10 euro. WhatsApp is 100 euro a month on top. Enterprise is contracted.
- Rating: G2 4.7 from 334 reviews
- Watch for: the AI allowance is small next to the chat allowance. Starter includes 500 chats but only 100 AI chats, so an AI-first bot burns the smaller meter five times faster.
Pros
- The highest G2 score here on a base worth trusting, 4.7 from 334.
- Genuinely no-code, so the person who wants the bot can build it.
- Publishes a plain overage rate for both chat types.
Cons
- The included AI-chat allowance is a fifth of the ordinary chat allowance.
- WhatsApp is a separate 100 euro a month.
Build the flow free, then decide whether the AI layer earns its 10 cents.
6. Chatbase: Best for a bot trained on your own documents
Chatbase is the fastest route from a pile of documentation to a working agent: point it at your site and files, and it answers from them. It sells message credits rather than conversations, which makes it look cheaper than it is, because one conversation consumes several messages. At 40 dollars per 1,000 auto-recharge credits the headline unit is 4 cents, but the comparable figure depends entirely on how chatty your visitors are. It holds the highest score in this list at 4.8, on 25 reviews, which is too few to lean on.
Key details:
- Best for: getting a documentation-trained agent live this afternoon.
- What it does: trains agents on URLs, files and Q&A pairs, AI actions, multiple agents per workspace, outbound campaigns, personalisation, attachments.
- Free tier: yes: 50 message credits a month, and agents are deleted after 14 days of inactivity.
- Pricing: Hobby 40 a month for 700 message credits. Standard 150 for 4,000. Pro 500 for 15,000. Auto-recharge at 40 per 1,000 credits. Extra agents 25 each a month. Enterprise is quoted. 7-day trial on paid plans.
- Rating: G2 4.8 from 25 reviews, too small a base to read as a verdict
- Watch for: credits are messages, not conversations, so the per-conversation cost is a multiple of the 4-cent headline. And free-plan agents are deleted after 14 days idle.
Pros
- Point it at your docs and it works, with almost no setup.
- Cheapest entry paid tier of any dedicated AI agent here.
- Auto-recharge means the agent does not simply stop mid-month.
Cons
- Billed per message, which is not comparable to per-conversation rates.
- Twenty-five reviews is not enough evidence for a 4.8.
The quickest way to find out whether an AI agent helps you at all.
7. Jotform AI Agents: Best free tier for a simple site bot
Jotform AI Agents is the option most people already have an account for. It bolts a conversational agent onto the form builder, so the bot collects and validates data rather than only answering questions, and it deploys to web, phone and messaging. It carries 778 G2 reviews at 4.5, more than every tool below it here. The catch for a price comparison is that it publishes plan prices but not a per-conversation AI rate: the AI agent allowances are described as limits that scale with the plan, without a public number attached.
Key details:
- Best for: sites where the bot’s job is to collect an enquiry, a booking or an application.
- What it does: AI agents trained on your content, form-filling and validation in conversation, web chat, phone and SMS channels, agent templates, handoff.
- Free tier: yes, the Starter plan: 5 forms, 100 monthly submissions and an AI agent allowance, with Jotform branding.
- Pricing: Bronze 34 a month billed annually, Silver 39, Gold 99, Enterprise quoted. AI agent limits scale with the plan. Dedicated phone number is a paid add-on. 50 percent discounts for nonprofits and education.
- Rating: G2 4.5 from 778 reviews
- Watch for: no published per-conversation AI rate, so you cannot model the cost of a busy month before you commit.
Pros
- A real free plan with an AI agent on it, no card required.
- The bot fills and validates forms, not just answers questions.
- Seven hundred and seventy-eight reviews at 4.5 is solid evidence.
Cons
- The AI conversation allowance has no published number.
- Free-plan forms and agents carry Jotform branding.
The pragmatic choice if the conversation ends in a form.
8. Chatling: Best cheap all-rounder
Chatling positions itself against the rest of this list explicitly, with a homepage headline about resolution rather than deflection, and it undercuts almost everyone: 21 dollars a month on annual billing for the entry paid plan, against 40 at Chatbase and 45 at Crisp. It deploys to web, WhatsApp, Instagram, Telegram and Messenger, and hands off to a human when the agent gets stuck. Its 4.7 across 78 G2 reviews is a real if modest evidence base. Credits, seats and custom domains are all separately metered above the plan.
Key details:
- Best for: a small team that wants the cheapest credible paid plan across several channels.
- What it does: AI agents on web and messaging channels, actions, human handoff, round-robin routing, full appearance customisation, team seats.
- Free tier: yes, with an AI credit allowance.
- Pricing: 25 a month, or 21 billed annually at 250 a year. 75 a month, or 63 annually at 750. 295 a month, or 246 annually at 2,950. Extra AI credits sold per 1,000. Extra seats 35 a month. Custom domains charged per domain.
- Rating: G2 4.7 from 78 reviews
- Watch for: the add-on list. Seats at 35 a month each can double a 21-dollar plan before you have added any credits.
Pros
- The cheapest credible paid plan in this list at 21 a month annually.
- Five channels including WhatsApp and Instagram at the entry tier.
- Free plan includes AI credits, unlike Crisp's.
Cons
- Seats, credits and domains are three separate add-on meters.
- Seventy-four reviews is modest next to the leaders here.
The budget pick that does not feel like one, provided you stay off the add-ons.
9. Voiceflow: Best for design-led CX teams
Voiceflow is an agent design platform rather than a chat widget: teams map, build, test and measure agents across channels, with conversation-level analytics and model-based evaluations of the agent’s own answers. It is aimed at enterprise CX teams and it shows, most obviously in the pricing page, which carries no prices at all. There is a free trial with no card, and everything past that is a conversation with sales. It holds 4.6 across 111 G2 reviews.
Key details:
- Best for: a CX team with designers and analysts who own the agent as a product.
- What it does: agent design and orchestration across channels, versioning, testing, LLM-based evaluations, conversation analytics, enterprise deployment controls.
- Free tier: no published free plan. A free trial, no credit card required.
- Pricing: not published. The pricing page names plan tiers without rates and routes to sales.
- Rating: G2 4.6 from 111 reviews
- Watch for: you cannot model the cost at all before a sales call, which rules it out for anyone who needs a number this week.
Pros
- Evaluation tooling that scores the agent's own answers at scale.
- Genuine multi-channel orchestration rather than a single widget.
- One hundred and eleven reviews at 4.6 from an enterprise buyer base.
Cons
- No published pricing of any kind.
- Overkill for a website that needs one bot on one page.
The enterprise option, priced the way enterprise options are priced.
10. Algomo: Best for pipeline rather than deflection
Algomo is the odd one out here, and deliberately so. Every other tool on this list exists to answer a question so a human does not have to. Algomo exists to identify who is on your site and book a meeting with them, which is a sales job rather than a support one. Its own chat widget describes the method plainly: IP resolution and firmographic data, no form required. Pricing starts at 200 dollars a month with no per-seat charge. It ranks last here on evidence rather than capability: its G2 profile carries no reviews at all, and the only independent signal anywhere is six Product Hunt reviews.
Key details:
- Best for: B2B sites where the goal is a booked meeting, not a closed ticket.
- What it does: AI inbound agent that qualifies and books, website personalisation by account, visitor identification, personalised LinkedIn ads, outbound landing pages.
- Free tier: no. Demo-led, with pricing from 200 a month.
- Pricing: from 200 a month, no per-seat pricing. Enterprise is quoted with custom integrations.
- Rating: Product Hunt 5.0 from 6 reviews. Its G2 profile has none
- Watch for: visitor identification is regulated differently by country, and the accuracy of IP-to-company resolution varies enough that it is worth testing on your own traffic before committing.
Pros
- Aimed at pipeline, which nothing else in this list is.
- Flat pricing with no per-seat charge from 200 a month.
- Identification and conversation run in one product rather than two.
Cons
- No G2 reviews and only six on Product Hunt, the thinnest evidence here.
- No free tier and no self-serve, so evaluating it means booking a demo.
A different product to the rest of this list, on the least evidence in it.
What an AI conversation actually costs
Four of these ten publish a rate you can put in a spreadsheet. Here they are next to each other, with the unit each vendor actually bills, because the units are not the same thing.
| Tool | Published rate | What the unit is |
|---|---|---|
| Intercom Fin | 0.99 dollars | one resolution, charged once per conversation, only when the AI closes it |
| Botpress Plus | 0.65 dollars | one conversation, in packs of 100, closed or not |
| Botpress Team | 0.50 dollars | the same unit, on the larger plan |
| Landbot | 0.10 euro | one AI chat beyond the plan allowance, closed or not |
| Crisp | about 0.056 dollars | one automated conversation, derived from the credits and conversation counts on their own plans |
| Chatbase | 0.04 dollars | one message credit, and a conversation is several messages |
The Crisp figure is arithmetic on their own numbers rather than a rate they print. Their three paid plans include 5, 25 and 75 dollars of AI credits and are described as buying about 90, 450 and 1,350 automated conversations. All three pairs come out at a shade under 5.6 cents.
Now the part that matters. Intercom charges only when the AI resolves the conversation; Botpress and Landbot charge whether it does or not. Intercom’s own pricing page quotes a customer running a 50 percent resolution rate. At that rate, 100 conversations produce 50 resolutions and cost 49.50 dollars, which is 49.5 cents per conversation. Botpress Team charges 50 cents per conversation. The two pricing models look nothing alike and land within half a cent of each other.
So the 18x headline gap is real but it is not the whole picture. The genuine spread, once you convert everything to cost per conversation attempted, runs from roughly 5.6 cents at Crisp to roughly 50 cents at Intercom and Botpress. That is still ninefold, and it is still the biggest single number in this decision.
Where this goes wrong
The free tier often has the AI switched off. Crisp’s free plan carries no AI credits at all, so what you are testing is a live-chat inbox. Landbot’s free plan gives 100 chats and zero AI chats. Chatbase gives 50 message credits and deletes idle agents after 14 days. Only Jotform, Chatling, Tidio and Botpress let you put a working AI agent in front of a visitor without paying.
A resolution rate is not a fixed property of the tool. It depends on how good your documentation is, which is the input nobody sells you. A tool billed per resolution rewards you for writing better help content, because the AI closes more and you pay more. A tool billed per conversation rewards you for the same thing in the opposite direction. Model both before you decide which meter you prefer to be on.
The widget is not free in performance terms either. Every one of these ships a third-party script that loads on every page, and chat widgets are a recurring offender in interaction latency. Measure before and after, using the method in INP and Core Web Vitals, and read the result against the page speed correlation study before deciding the trade is worth it.
And the bot is a page on your site. Whatever it says becomes part of what people, and increasingly machines, understand your product to be. The same content that makes an AI agent accurate is the content that makes you quotable elsewhere, which is the subject of the GEO audit checklist and keeping an update history AI search can read.
AI chatbots for websites compared
| Rank | Tool | Best for | Free tier | Published AI rate | Entry price | Rating |
|---|---|---|---|---|---|---|
| 1 | Intercom Fin | Best overall | Trial only | 0.99 a resolution | 29 dollars a seat | G2 4.5 (3,907) |
| 2 | Crisp | Best value on AI conversations | Yes | about 0.056 a conversation | 45 dollars a workspace | G2 4.5 (202) |
| 3 | Tidio | Best for small ecommerce | Yes | Tiered by AI conversation | Free to start | G2 4.6 (1,962) |
| 4 | Botpress | Best for developers | 100 conversations | 0.65 then 0.50 a conversation | 150 dollars a month | G2 4.5 (511) |
| 5 | Landbot | Best no-code builder | 100 chats | 0.10 euro an AI chat | 32 euro a month | G2 4.7 (334) |
| 6 | Chatbase | Best for a bot trained on your own documents | 50 credits | 0.04 a message credit | 40 dollars a month | G2 4.8 (25) |
| 7 | Jotform AI Agents | Best free tier for a simple site bot | Yes | Not published | 34 dollars a month | G2 4.5 (778) |
| 8 | Chatling | Best cheap all-rounder | Yes | Credit-based | 21 dollars a month | G2 4.7 (78) |
| 9 | Voiceflow | Best for design-led CX teams | Trial only | Not published | Not published | G2 4.6 (111) |
| 10 | Algomo | Best for pipeline rather than deflection | No | Not published | 200 dollars a month | Product Hunt 5.0 (6) |
Prices are each vendor’s own published rates, read on 25 August 2026. Annual billing where the vendor presents it by default.
Related reading
A chatbot is one of several places AI now sits between you and a buyer. The outbound equivalent is the 10 best AI SDR tools, and the voice equivalent is the 12 best AI voice agents, which has the same pricing problem in a different unit.
For the wider stack around all of this, the 12 best AI sales tools covers the revenue layer and the 8 best AI SEO tools covers the search side.
If the reason you want a bot is that visitors cannot find answers, the cheaper fix is often the content itself. The GEO content audit framework is where to start, and headless CMS rendering covers the case where the answers exist but nothing can read them.
And if the bot is going to be the busiest thing on your site, it is worth knowing when the site is down. We ranked that category in the 10 best website monitoring tools.
Conclusion
Intercom Fin is the best AI chatbot for a website, and the evidence is not close: 3,907 G2 reviews at 4.5, an AI that resolves rather than deflects, and a bill that only starts when it works. If you have the support volume to justify it, buy it.
Most people reading this do not. For them the answer is Crisp, at 45 dollars a workspace with AI at about 5.6 cents a conversation and no per-seat charge. An online shop should look at Tidio instead, a developer at Botpress, a marketer who wants to build the flow themselves at Landbot, and anyone who just wants a bot trained on their documentation by lunchtime at Chatbase.
Whichever you pick, work out your cost per conversation before you sign, not after. It is the only number in this category that moves by an order of magnitude.