BYOAIK (Bring Your Own AI Key) is a directory of AI tools that run on your own API key.

WebBrain

Chrome and Firefox browsing agent that can point at any OpenAI-compatible server, including yours.

Website Source code

Category:
Browser Extensions
Maintenance:
Actively developed (last commit today)
Pricing:
Open Source
Open source:
Yes (GPL-3.0)
Self-hostable:
No
Local-first:
No
Platforms:
Browser Extension, Local-only
AI providers (bring your own key):
OpenAI, Anthropic, Ollama, Custom / OpenAI-compatible
API key storage:
Stored in browser storage
Key risk level:
MEDIUM
Trust score:
68/100

WebBrain is a browser agent for Chrome and Firefox that reads and acts on the page you are on. Its default model needs no key or local setup, and it can be pointed at any OpenAI-compatible server instead, which is the configuration worth choosing if you would rather your browsing context went to a machine you run. Licensed GPL-3.0: the repository's LICENSE opens with a project notice and then reproduces the GPL in full, which is why GitHub reports it as unlicensed.

How this tool was scored

Key handling 62/100 (where your key rests and who sees it, comparable across any licence) and verifiability 70/100 (how much of that BYOAIK could confirm, lower for closed source). Neither contains a popularity signal.

  • Key Safety 13/25: The key is persisted in browser local storage, which any script on the page can read.
  • Request Routing 17/20: Requests go straight from you to the AI provider.
  • Transparency 20/20: Source is public under GPL-3.0, so anyone can check how the key is handled.
  • Privacy 7/15: Nothing specific is known about its data handling beyond the key itself.
  • Maintenance 10/10: Actively developed, with commits within the last three months.
  • Verification Confidence 1/10: Compiled from public documentation by an AI-assisted pass, not independently confirmed.

What was checked

Verification tier RESEARCH_ASSISTED, derived from the evidence below and not set by hand.

  • [REPORTED · RESEARCH] This listing was compiled by an AI-assisted research pass over the tool's public website, README and documentation. No person independently confirmed it.
  • [STRONG · SOURCE_SCAN] Supports a local model backend, so it can run with no cloud provider key at all. source
  • [CONFIRMED · SOURCE_SCAN] Most recent commit 2026-09-29, about 0 month(s) ago. source

How your API key is handled

Your API key is stored in your browser's local storage. Requests are sent directly to the AI provider.

Setup

Open the extension/app settings, paste your provider API key (kept in your browser), and pick a model.