The Sintra alternative Stop chatting with helpers.
AI agents that build their own tools and run themselves. Free. Open source.
You run it vs it runs itself
Sintra
EXTREMELY
48,210 actions today1 time you stepped in
What runs
Side by side
| EXTREMELY | Sintra | |
|---|---|---|
| Roles | 10 agent packs, each agent its own job | 12 helpers, plus custom ones you build |
| Missing integration | ✓ Builds it itself | 1,000+ via Composio; more by request |
| Before it sends | Starts on Approval | Scheduled tasks run without approval |
| Runs on | Your computer | Sintra web and mobile apps |
| AI | Your plan, keys or local model | Claude 4.5 Sonnet, 250 credits/mo |
| Price | Free | $48.50/mo, or $187.20/yr (sale prices) |
Sintra details from sintra.ai, checked 5 November 2026.
Pick the right one
Sintra if
- Zero setup: just chat
- Web and mobile apps
- A named helper for each role
EXTREMELY if
- Agents that build their own tools
- Runs on your computer and your AI
- Free and open source
Questions
Is EXTREMELY a free Sintra alternative? Yes. Open source (AGPL-3.0), runs on your own computer, on the AI you already have. Optional hosting is US$399 a year.
What's the difference between Sintra and EXTREMELY? Sintra gives you 12 chat helpers, plus custom ones, on web and mobile, with scheduled tasks. EXTREMELY agents run on your computer with a job and a schedule, pick their own steps and build the tools they're missing.
Does EXTREMELY ask before acting? You choose. Every tool is Silent, Logged or Approval, and anything leaving the business, like an email or a post, starts on Approval.