Comparison

Kelu vs Brainfish

Last reviewed:

Both platforms give cited AI answers for B2B support and flag knowledge gaps. Brainfish also runs actions and workflows and is priced by quote. Kelu publishes its prices, has a free plan, and answers from one knowledge base in a docs widget, Slack and Teams bots, an MCP server, a support form deflector and your helpdesk.

Short answer

Choose Brainfish if you want an AI support platform that also learns from calls and demos and runs actions and workflows, and you're happy to buy through sales. Choose Kelu if you want public pricing with a free plan to start, community and code sources like Discourse, Stack Overflow and GitHub, and an abstention gate that says it doesn't know when your docs don't cover a question.

Try Kelu FreeSee Pricing

Feature comparison

Brainfish details come from Brainfish's own website and help center, listed under the table.

Feature
Kelu
Brainfish
Retrieval
Hybrid: pgvector + full-text, RRF fusion, LLM query rewrite, cross-encoder reranking, abstention
Hybrid: full-text plus semantic search, with cited answers
Source citations
Yes
Yes
Source connectors
24 source types: websites, GitHub (docs, code, issues, PRs, discussions), Notion, Confluence, Google Drive, OneDrive, Zendesk Help Center and solved tickets, Jira, Jira Service Management, Linear, Salesforce Knowledge and Cases, Discourse, Stack Overflow, YouTube, OpenAPI, S3, files, curated Q&A
Notion, Confluence, Google Drive, Loom, Zendesk, Salesforce Knowledge, Help Scout, Helpjuice, Mintlify, ReadMe, OpenAPI specs and websites; also learns from calls, demos, tickets and Slack threads
GitHub / OpenAPI indexing
Yes: docs files, source code, issues, PRs and discussions; OpenAPI spec ingestion
Knowledge from GitHub PRs, and OpenAPI specs synced through GitHub Actions
Community forums (Discourse, Stack Overflow)
Yes
Not documented on their site as of Oct 2026
Chat surfaces
Docs widget, support form deflector, Slack, Microsoft Teams, MCP, REST and WebSocket APIs, and tickets in Zendesk, Intercom, Freshdesk, Front and Linear
Chat on your site and in your product, email through your helpdesk, help center, developer docs, Slack and Microsoft Teams
MCP server (Cursor / Claude / ChatGPT)
Yes: one per knowledge base, with search and ask tools
Yes: an MCP server with tools to search, read, write and answer, for Claude, Cursor and VS Code Copilot
Browser extension
Side panel for Chrome, Edge and Opera; not in the Chrome Web Store yet
Brainfish Assist, a Chrome extension that stays open as a sidebar
Knowledge gaps
Gap report of unanswered and weak questions, which can become doc proposals
Flags knowledge gaps and answers that could be better
Pricing transparency
Public: Free / $99 Pro ($79/mo billed yearly) / Enterprise custom
No prices on its pricing page (the Platform plan includes 5 seats and 5,000 queries/month); its help center says the Platform plan starts at $1,500/month
Free tier
Yes: 100 questions/month, no credit card
Not listed; a discounted startup plan is offered
Sources, checked October 29, 2026: Brainfish home · Brainfish pricing · Brainfish pricing (help center) · Brainfish product · Brainfish data sources · Brainfish MCP server · Brainfish Chrome extension

Where Kelu focuses differently

Public pricing and a free tier

Brainfish shows no prices on its pricing page; its help center puts the Platform plan at $1,500 a month. Kelu publishes its prices and offers a free plan with no credit card, so you can try it on your own docs before talking to anyone.

Community and code sources

Kelu indexes Discourse forums, Stack Overflow for Teams and YouTube next to GitHub code, issues, pull requests and discussions, useful when product knowledge lives in code and community threads as well as in docs.

Abstention enforced in code

When your sources don't cover a question, Kelu's abstention gate withholds both the excerpts and the citations, so the answer is "I don't know" rather than a guess. The question then shows up in your gap report.

Helpdesk answers you can rehearse

Kelu's Support Ticket AI answers tickets in Zendesk, Intercom, Freshdesk, Front and Linear. Simulations replay up to 100 recent resolved tickets first, so you set the confidence threshold on real data and start in Draft only.

Got questions?

Frequently asked questions

Is Kelu a good replacement for Brainfish?

For B2B support with docs, help center and tickets as sources, both give cited answers. Kelu adds community and code sources, public pricing and a free plan. If you need an assistant that learns from call recordings and demos, or runs actions and workflows, Brainfish covers more of that.

How does retrieval quality compare?

Both use hybrid retrieval: Brainfish combines full-text search over article content with semantic search. Kelu fuses PostgreSQL full-text and vector results with reciprocal rank fusion, rewrites the query with an LLM before search, reranks with a cross-encoder, and withholds citations when the sources don't cover the question.

Can I move from Brainfish to Kelu?

Yes. Reconnect the same sources (docs sites, Notion, Confluence, Google Drive, Zendesk), embed the widget, and install the Slack or Teams app. A first cited answer takes minutes once a docs source has synced.

How does pricing compare?

Kelu: Free (100 questions/mo), Pro $99/mo or $79/mo billed yearly (1,000 questions, 5 knowledge bases), Enterprise custom. Brainfish shows no prices on its pricing page; its help center says the Platform plan starts at $1,500/month.

Is my data used to train models?

No. Your connected content and end-user conversations are never used to train models. PII masking and zero retention are available on every plan.

See for yourself

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