AI chatbot
By Saurav | Founder of saavos | Building in public toward $10k MRR
[!TLDR] Four platforms train a chatbot on your own website content for under $50/month: saavos ($19/mo, Claude Sonnet), Botsonic ($19/mo annual, GPT-4o mini), Wonderchat ($29/mo annual), and Chatbase ($32/mo annual). FastBots Essential ($39/mo) also fits but skews toward multi-channel rather than pure website FAQ deflection. All pricing confirmed from vendor pages on 2026-05-18.
The sub-$50 custom-chatbot tier is more crowded than most comparison posts let on. Every piece I find either covers tools at $0 (too limited to ship) or $99+ (enterprise). The $19–$49 band — where most indie SaaS founders actually land — gets lumped together as "cheap options" without real differentiation.
That's the gap this post is trying to fill.
I'm the founder of saavos, so I have a stake in this. I'll tell you where we win and where we don't. Four of the five products listed here I've actively watched; one (Botsonic) I pulled from their current pricing page specifically for this post. Numbers are as of 2026-05-18.
| Product | Entry paid | Billing | Messages/mo | Training sources | AI model | Free tier |
|---|---|---|---|---|---|---|
| saavos | $19/mo | Monthly | Unlimited* | URL, PDF | Claude Sonnet | Yes (50 msg/mo, permanent) |
| Botsonic | $19/mo | Annual only | 1,000 | URL, PDF, files | GPT-4o mini | No (7-day trial) |
| Wonderchat | $29/mo | Monthly ($25 annual) | 1,000 credits | URL, files | GPT-4o | Yes (20 credits/mo) |
| Chatbase | $32/mo | Annual ($40 monthly) | 500 credits | URL, PDF, Notion, YouTube | GPT-4o, Claude, GPT-5 | Yes (50 msg/mo, deletes after 14d inactivity) |
| FastBots | $39/mo | Monthly | 2,000 | URL, PDF, files | All major LLMs | Yes (50 msg/mo) |
*saavos conversation limits: Starter tier has per-month message caps — check saavos.com/pricing for current limits. Message "credits" on Chatbase/Wonderchat and flat message caps on other products are different unit structures; see below.
There's one immediate thing to flag: "message credits" and "messages" aren't the same unit across these products. Wonderchat and Chatbase both use credit-based systems where one user message might consume multiple credits depending on model and context length. A 1,000-credit month on Wonderchat doesn't translate to 1,000 conversations. I'll explain how this plays out in practice.
saavos is website-and-PDF only. You paste a URL or upload a PDF; the ingestion pipeline crawls and chunks your content; you embed a script tag on your site. The bot answers visitor questions citing back to your sources. It runs Claude Sonnet — the same model class as Anthropic's flagship — on every paid plan.
The permanent free tier (50 messages/month, no card required) is genuine — no time expiry unless you go inactive for a long stretch. The Starter tier's conversation cap is real; check the pricing page. Where saavos is thin: no multi-channel (WhatsApp, Instagram), no model selection, no Notion integration yet.
Pricing confirmed from saavos.com/pricing, 2026-05-18.
Botsonic's $19/month is annual-billing-only — $16/month billed annually equals roughly $192/year upfront. Month-to-month pricing is $19, but that's still annual-equivalent for a 12-month commitment. No permanent free tier: the trial is 7 days.
At entry tier: 1,000 messages/month, GPT-4o mini (not GPT-4o). That model distinction matters — GPT-4o mini is cheaper and faster but meaningfully less capable on nuanced retrieval questions than GPT-4o or Claude Sonnet. Upgrading to GPT-4o requires the $49/month Professional plan. Botsonic's entry tier is priced identically to saavos but ships a lower-tier model and caps messages at 1,000.
Pricing confirmed from botsonic.com/pricing, 2026-05-18. No permanent free tier — 7-day trial only.
Wonderchat's Starter is $29/month (billed monthly) or $25/month annually. The credit system: 1,000 credits/month, where each message exchange uses a variable credit amount depending on response length. For short FAQ answers — "what does your Pro tier include?", "do you have a free trial?" — you'll comfortably get 600-800 actual user exchanges from 1,000 credits. For long multi-paragraph responses, credits burn faster.
Wonderchat supports URL crawl and file uploads, monthly data sync to re-crawl sources, and basic lead collection. It runs GPT-4o at the entry tier. The permanent free tier gives 20 message credits/month — meaningful for testing, not for production. The $29/month Starter is solid for basic website chatbots but the credit math is something you should model against your expected traffic before committing.
Pricing confirmed from wonderchat.io/pricing, 2026-05-18.
Chatbase Hobby is $32/month on annual billing or $40/month month-to-month. The 500-credit/month cap at Hobby is the tightest limit in this table — roughly 300-500 actual conversations depending on response length. For a low-traffic site (under 200 unique visitors/month) that's fine. For anything above 500 monthly conversations, you'll hit the cap.
What Chatbase does that none of the other three match: training source breadth. Notion (native), Google Docs, YouTube transcripts, RSS feeds — all live in 2026 alongside URL crawl and PDF. Model selection includes GPT-4o, Claude Sonnet, and GPT-5 variants. If your docs live in Notion or you want to swap models per use case, Chatbase is the only one in this tier with those options.
The 14-day inactivity deletion on the free tier is a real gotcha — if you set up a test bot and don't check it for two weeks, it's gone. Pay attention to that if you're evaluating before buying.
Pricing confirmed from chatbase.co/pricing, 2026-05-18.
FastBots sits at $39/month — it raised its Essential tier from $16–19 in early 2026, which is why it's at the top of the price range here. The tradeoff for $39: multi-channel is included from entry tier. WhatsApp, Instagram, Messenger, Slack, Telegram — all live on Essential. If your audience is on WhatsApp or Instagram and you want one bot trained on your content that works across those surfaces, FastBots at $39 is the only product in this table with that in the entry tier.
2,000 messages/month, access to all major LLMs (GPT-4o, Claude, Gemini), Zapier integration. The message cap is the most generous in the table. FastBots lost its price advantage when it raised to $39, but it gained channel breadth most competitors charge extra for.
Pricing confirmed from fastbots.ai/pricing, 2026-05-18.
All five products use retrieval-augmented generation (RAG): your content gets chunked, embedded into a vector database, and the bot retrieves the most relevant chunks at query time before generating an answer. The underlying architecture is nearly identical.
Where they differ:
Source breadth. Chatbase wins: Notion, YouTube, Google Docs, plus the standard URL/PDF. FastBots and Botsonic support URL, PDF, and general file uploads. Wonderchat is URL and files. saavos is URL and PDF.
Crawl accuracy. URL crawlers vary in quality. Sites with JavaScript-heavy rendering, aggressive robots.txt, or deep paginated docs don't crawl cleanly on any of these tools. Chatbase and FastBots both let you manually add individual URLs if the crawl misses pages; saavos lets you specify source URLs directly. Test your actual site before buying, not a demo URL.
Source refresh cadence. Wonderchat: monthly re-sync on Starter. Chatbase: manual re-train triggered by you. saavos: manual re-train. FastBots Essential: manual + optional auto-retrain on higher plans.
This is the comparison that rarely gets run.
A typical indie SaaS site with 500 unique visitors/month and a 15% chatbot engagement rate generates ~75 chatbot sessions. Each session averages 3-4 messages. That's roughly 225-300 messages/month — comfortably under every cap in the table.
Double the traffic (1,000 uniques, same engagement rate): 450-600 messages. Chatbase's 500-credit Hobby tier becomes tight. saavos, Botsonic's 1,000 cap, and Wonderchat's 1,000 credits are fine. FastBots' 2,000 is extremely comfortable.
At 5,000 unique visitors/month (roughly when you're getting serious SaaS traction): 750-1,000 sessions, 2,250-3,000 messages. Every sub-$50 option is now too tight or borderline — you're looking at the next tier up on each platform ($49-$120/month range).
The message-cap question only bites above ~1,000 monthly visitors with normal engagement rates. Below that, every product in the table is sufficient.
Cheapest monthly commitment with a real permanent free tier: saavos. $19/month paid, genuine free tier with no time expiry, Claude Sonnet on paid plans.
Widest training source support: Chatbase. Notion, YouTube, Google Docs — nobody else in this tier has those live.
Multi-channel at the entry tier: FastBots. WhatsApp, Instagram, Slack, Telegram from $39/month — no one else includes that below $100/month.
Best credit-to-conversation ratio for a standard FAQ use case: FastBots (2,000 flat messages) or saavos if your traffic is under the Starter cap.
Model flexibility: Chatbase (GPT-5 variants, Claude, GPT-4o selectable per-account).
Pick saavos if: you want Claude Sonnet from a $19/month entry tier, a permanent free tier to test on your real docs first, and you're running a website-only chatbot for a small SaaS. No multi-channel, no Notion, but the fastest setup and the lowest monthly number.
Pick Botsonic if: you're OK with GPT-4o mini at entry, you're committing annually, and Botsonic's feature set aligns with your workflow. The identical $19/month price versus saavos means the model difference (Claude Sonnet vs GPT-4o mini) is the deciding factor.
Pick Wonderchat if: the credit model makes sense for your traffic pattern, you want GPT-4o at $29/month, and you want a simple chatbot without the deeper feature questions.
Pick Chatbase if: your docs are in Notion or YouTube, or you want model selection (GPT-5 variants are live), and you're comfortable paying $32–40/month for the feature depth.
Pick FastBots at $39/month if: multi-channel is a real requirement — WhatsApp, Instagram, Slack — and you want one trained bot that covers all of them.
I built saavos because I kept watching founders pay $150/month for Botpress or $0/month for something that didn't work. The $19-$39 tier is genuinely viable for the job most indie founders need done: website FAQ deflection, trained on your docs, embedded in under 20 minutes.
Every product in this table does that job. The differentiation is on source breadth, model choice, and channel coverage. If those dimensions don't matter for your use case, start with the lowest price — test on the free tier, check the conversation logs after two weeks, and upgrade only when you have evidence you're hitting a cap.
Try saavos free — no card, no time limit, 50 messages/month to test on your actual docs.
Related reading: saavos vs Chatbase vs FastBots: an honest 2026 comparison · AI chatbot pricing comparison 2026: what your $19 actually buys · Botpress vs saavos 2026: pricing breakdown for indie founders
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saavos and Botsonic both start at $19/month for custom-trained chatbots in 2026. The key difference: saavos uses Claude Sonnet on its $19 Starter tier and has a permanent free tier (no time expiry). Botsonic at $19/month is annual billing only, uses GPT-4o mini at the entry tier (not GPT-4o), and offers only a 7-day free trial. Wonderchat starts at $29/month ($25/month annual), Chatbase at $32/month annual ($40/month monthly). Pricing verified from vendor pages 2026-05-18.
It varies. saavos Starter: check current limits at saavos.com/pricing. Botsonic Starter: 1,000 messages/month. Wonderchat Starter: 1,000 credits/month (credit-to-message ratio varies by response length; expect 600–800 actual exchanges). Chatbase Hobby: 500 credits/month — the tightest cap in the sub-$50 tier. FastBots Essential ($39/month): 2,000 messages/month — the most generous flat cap. For a typical indie SaaS site at 500 unique visitors/month and 15% chatbot engagement, you need roughly 225–300 messages/month, so all tiers are sufficient until traffic scales past ~1,000 monthly visitors.
saavos runs Claude Sonnet on the $19 Starter tier. Botsonic runs GPT-4o mini at $19/month (GPT-4o requires the $49 Professional tier). Wonderchat runs GPT-4o at $29/month. Chatbase offers model selection at $32/month — GPT-4o, Claude Sonnet, and GPT-5 variants — the only sub-$50 option with multi-model choice. FastBots Essential ($39/month) supports all major LLMs. Model choice matters for retrieval quality on nuanced questions; GPT-4o mini is noticeably less capable than GPT-4o or Claude Sonnet on complex queries.
Yes, but only with Chatbase. Chatbase Hobby ($32/month annual) includes native Notion integration as a training source. No other sub-$50 platform in 2026 — saavos, Botsonic, Wonderchat, or FastBots — has Notion training live at the entry tier. If your knowledge base lives in Notion, Chatbase is the only verified option at this price point. Chatbase also supports YouTube transcripts and Google Docs, which the others do not.
FastBots Essential ($39/month) includes WhatsApp, Instagram, Messenger, Slack, and Telegram from the entry paid tier — the only sub-$50 platform with multi-channel included at launch. No other product in this comparison (saavos, Botsonic, Wonderchat, Chatbase) supports WhatsApp at the entry tier. If WhatsApp is a hard requirement, FastBots at $39/month is the minimum viable option in this price range.
Most do, but the quality varies. saavos: permanent free tier, 50 messages/month, no card required, no time expiry. Chatbase: free tier with 50 messages/month, but bots delete after 14 days of inactivity — test actively or your setup disappears. FastBots: free tier with 50 messages/month, no time expiry listed. Wonderchat: free tier with 20 credits/month — real but minimal. Botsonic: no permanent free tier, 7-day trial only.
Builds tools for solopreneurs and small SaaS teams who don't have an afternoon to spare.
Paste your URL. Train your bot. Drop one script tag. No credit card.