Fellou vs Tandem Browser
Fellou
fellou.ai
Tandem Browser
tandembrowser.orgSide by side
| Figure | Fellou | Tandem Browser |
|---|---|---|
| Price from | $19/mo | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Windows | — | Yes |
| macOS | Yes | Yes |
| Linux | — | Yes |
| API | — | Yes |
| Plans published | 7 | 1 |
| Spec score · AI Browsers | 8.1 (#8) | 7.4 (#18) |
| Spec score · Browser Agents | 8.0 (#7) | 7.5 (#11) |
| Product | Fellou describes itself as an agentic AI browser that takes automated web action. | Tandem Browser is an open-source, local-first browser where AI agents share the user's browser session, tabs, cookies, and DOM. |
| Security | The privacy policy says it uses commercially reasonable technical, administrative, and organizational measures to protect personal data. | The maker describes an eight-layer security pipeline with an 811K-plus-entry blocklist, YARA-style rules, AST fingerprinting, entropy detection, and 51 automated tests. |
| Support | The policy says privacy inquiries will receive a response within fifteen working days after identity verification. | The maker directs users to GitHub Discussions for questions and troubleshooting, and GitHub issues for bugs and concrete feature requests. |
Plans
Fellou
- FreeFree
- Plus$19 a month
- Pro$39.90 a month
- Ultra$199.90 a month
- Plus (annual)$19,216 a year
- Pro (annual)$38,432 a year
- Ultra (annual)Price not published
In their own words
Fellou
Fellou is an agentic AI browser for automating web and desktop work on macOS. Users describe a task in natural language, then can review, edit, or approve the step-by-step workflow before it runs. Its research tools work across the internet, including logged-in accounts such as Reddit, and create reports with verifiable sources. Browser Use can scrape data and fill forms; with permission, Computer Use can operate local apps and manage files. Workflows can connect apps, with LinkedIn-to-Notion data transfer given as an example, and can be scheduled once or on a recurring basis. Users can monitor progress and intervene during execution. Developers can use the open-source Eko 2.0 framework to build custom agents with natural language and JavaScript. A free plan is listed, alongside paid options including Plus at $19 a month and Pro at $39.90 a month. Fellou says Spark use varies significantly with workflow complexity, so task estimates are approximate. Its privacy policy says service content and output may be used to improve services after encryption and de-identification; users can object to data use for service training.
Tandem Browser
Tandem Browser is a free, MIT-licensed browser in developer preview for running AI agents alongside a person’s browsing session. Agents share tabs, cookies, and the DOM, and can work with the accessibility tree, rendered DOM, network requests, console output, and DevTools. If an agent reaches a CAPTCHA, unclear form, or judgment call, it pauses for user help. MCP- or HTTP-speaking agents can connect locally or through a private Tailscale network, with separate workspaces and tab locks. The documented API includes more than 280 HTTP endpoints and 257 MCP tools, protected by bearer tokens. Tandem has no cloud backend, subscription, or telemetry according to its FAQ; browsing data remains on the machine unless sent elsewhere. It can run offline with Ollama or LM Studio. Daily-driver features include extensions, bookmarks, history, a local password vault, workspaces, and sidebar apps. It uses Chromium and supports macOS Apple Silicon, Windows 11 x64, and Linux on a best-effort basis.