psi
Not yet tested · pricing checked
psi is portable terminal coding agent written in ANSI C and Lua, shipped as a ~6.4 MB binary that runs on Linux, macOS, Windows, FreeBSD/OpenBSD and Haiku. Interactive TUI, REPL and one-shot modes, Lua extensions for commands and tools, append-only JSONL session trees, and providers for Anthropic, OpenAI Codex, OpenRouter or local Ollama models. MIT licensed (category: Coding Agents (CLI & Cloud)). Not yet tested by VibeToolRank. Pricing: Free and open source (MIT). Bring your own model provider key or a local Ollama model; no psi paid plan listed.. Free tier: Yes: MIT open-source binary, no psi account or card claimed (psicode.ai + GitHub, verified 2026-11-09).
Key facts
- VibeToolRank score
- Not yet tested
- Why not tested
- Not yet tested; likely headless-testable on Linux with an OpenRouter :free model.
- Category
- Coding Agents (CLI & Cloud)
- Free plan
- Yes: MIT open-source binary, no psi account or card claimed (psicode.ai + GitHub, verified 2026-11-09)
- Price
- Free and open source (MIT). Bring your own model provider key or a local Ollama model; no psi paid plan listed.
- Pricing checked
- 2026-11-09
Pricing and free tier
Current official pricing (checked ): Free and open source (MIT). Bring your own model provider key or a local Ollama model; no psi paid plan listed.
Is psi free? Yes: MIT open-source binary, no psi account or card claimed (psicode.ai + GitHub, verified 2026-11-09)
verified-official official source · full-page-read. Official plan limits can change; re-check the vendor page before paying. Figures from our tests are recorded observations, not a current-capacity promise.
Agent test verdict
Why not tested: Not yet tested; likely headless-testable on Linux with an OpenRouter :free model..
We will test it once this changes. See the methodology.
Pros, cons and who it's for
Who it's for: Developers who want a tiny, auditable, scriptable terminal coding agent that runs on unusual systems and any of several model providers.
FAQ
Is psi free?
Yes: MIT open-source binary, no psi account or card claimed (psicode.ai + GitHub, verified 2026-11-09).
Has VibeToolRank tested psi?
Not yet. Not yet tested; likely headless-testable on Linux with an OpenRouter :free model.
How much does psi cost?
Free and open source (MIT). Bring your own model provider key or a local Ollama model; no psi paid plan listed (from the official pricing page, checked 2026-11-09).
Related
Other Coding Agents (CLI & Cloud)
- Aider — 9.3/10
- Claude Code — 9.3/10
- Cline — 9.2/10
- GitHub Copilot CLI — 9.2/10
- OpenCode — 9.2/10
- Memdoor — 9.1/10
- OpenHands — 9.1/10
- Zerg Client — 9.1/10
- Amp — 9/10
- Reason — 8.6/10
- Alysis Code — 8.4/10
- Harness (Autonomous) — 8.4/10
- Jules — 8/10
- OpenAI Codex — 7.4/10
- Gemini CLI — 6.1/10
- Agent Manager — not yet tested
- Conducted — not yet tested
- Crewplane — not yet tested
- Devin — not yet tested
- Mirror (Reflection) — not yet tested
- Parallax (Conifer) — not yet tested
- Roomote (formerly Roo Code) — not yet tested
- Ski — not yet tested
- Wonder — not yet tested
Best Coding Agents (CLI & Cloud) · Best free Coding Agents (CLI & Cloud) · All tools · How we test
Sources
Scores come from our own tests and are never for sale; sponsored placements are always labelled. Some links are affiliate links (currently Railway). Disclosure