Chatbase alternatives for website and WhatsApp chatbots

Short answer: pick Botpress if you want more control over the conversation and WhatsApp on a free plan. Pick Retell AI if the same business needs a phone agent too, because it runs chat and voice from one knowledge base and charges per message. Look at Voiceflow if you are an agency building many client bots. If the problem is wrong answers, look at what the bot was trained on before you move, because that problem comes with you.

Figures below are from each company's own pages, checked on 21 September 2026.

Where Chatbase stands

Chatbase is the fastest way to get a chatbot trained on a business: point it at the website, add files, and it's live. Its plans on the day we checked:

Plan	Price a month	Message credits	Agents	Training data
Free	$0	50	1	1 MB
Hobby	$40	700	2	10 MB
Standard	$150	4,000	3	20 MB
Pro	$500	15,000	5	40 MB
Enterprise	Contact sales	Custom	Unlimited	Higher limits

Yearly billing takes 20% off, and extra credits are $40 per 1,000. An agent can be trained from files, websites, text, Q&A pairs, Notion pages and support tickets. With auto-retrain switched on, it retrains every 7 days to pick up changes. Voice and telephony start on the Standard plan, and removing the Chatbase branding is $99 a month.

People usually leave over one of three things. The credits run out on a busy site. Agencies hit the agent limit (two on Hobby, three on Standard, then $25 a month each). Or the bot confidently gives a wrong price.

Chatbase alternatives compared

	Chatbase	Botpress	Retell AI (chat agents)	Voiceflow
Starting price	$0, then $40/mo	$0, then $150/mo (billed yearly)	From $0.002 per message, no monthly fee	Not listed on its pricing page when we checked
What you get	700 credits on Hobby	25 conversations free, 250 on Plus	Pay per message	Free trial, no card
Agents	2 on Hobby	3 free, unlimited on Plus	Not listed on the pages we checked	Not listed
WhatsApp	Yes	Yes, Free and Plus	Not covered on the pages we checked	Not covered on the pages we checked
Voice	Standard plan and up	Enterprise only	Yes, same platform	Not covered on the pages we checked
Knowledge base from a website	Yes, retrain every 7 days	Yes, discovers pages from a root domain	Yes, re-crawled every 24 hours	Not covered on the pages we checked

Botpress: more control, WhatsApp included

Botpress counts conversations instead of messages. A conversation is "any exchange with at least two messages from the end user in the billing month". The free plan includes 25 a month, 3 seats and 3 agents. Plus is $150 a month billed yearly and includes 250 conversations, $25 of AI usage, unlimited agents, a white-label web chat and live support. Extra conversations cost $0.65 each on Plus. Team is $750 a month for 1,500 conversations. WhatsApp and web chat come with the Free and Plus plans. Voice is Enterprise only. Its knowledge base takes a website (give it a domain and it finds the pages), documents up to 50 MB, tables, pasted text, web search, and Notion or Google Drive through integrations.

Pick it if you want to design the flow as well as the answers, you build for Indian businesses that live on WhatsApp, or you need several agents without paying per agent.

Retell AI: chat and voice from one knowledge base

Retell is best known for phone agents, but it also runs chat agents from $0.002 a message, with no monthly fee on the self-serve tier. Chat and voice share the same knowledge base. It can crawl a whole website and refresh it every 24 hours, or sync from files, Google Drive, OneDrive and Notion. The first 10 knowledge bases are free and each one after that is $8 a month.

Pick it if the business answers phones as well as a website chat, and you don't want two sets of knowledge to keep in step.

Voiceflow: for agencies building many bots

When we checked, Voiceflow's pricing page described usage-based billing and a free trial with no credit card, but didn't list plan prices. It pitches directly to agencies and partners. Get a quote before you plan around it.

Pick it if you manage many client bots and want a platform that sells to agencies directly. Ask how its usage billing works out across your client list.

The wrong-answer problem travels with you

Chatbase, Botpress and Retell all do the same thing with a website. They cut it into chunks and hand the model the closest few when a customer asks something. Take a salon's price list: "Haircut 600, Colour 2,500, Keratin 4,500", spread across a table. It can end up with a price in one chunk and the service name in another. The bot reads out the number it was given, and it does so in writing, where the customer can screenshot it.

So before you migrate, fix the source. Every sentence with a price should name the service. Services should be listed by name, with no prices in the list. Where two pages disagree, settle it before the bot sees both. How to write a chatbot knowledge base goes through each step.

KB Builder turns a client's website into that kind of file, a Markdown document that trains Chatbase, Botpress or Retell equally well, plus a list of what the website never says.

Once you've chosen: set up its knowledge base properly

Each platform stores and searches a knowledge base differently: what files it takes, how many pieces it hands the agent per turn, and whether the agent searches at all without being told. Our setup guides cover that from each platform's own documentation, with the prompt lines we add after our own live calls:

• Setting up the Botpress knowledge base
• Setting up the Retell AI knowledge base
• Setting up the Voiceflow knowledge base

KB Builder is made by MasterBlocks, which also makes SpeakEdge, a voice agent platform. We are not affiliated with any platform named here.