✓ Bring Your Own Keys · ✓ Local-First · ✓ Perpetual Licence · ✓ Desktop + Mobile
Works with: Anthropic · OpenAI · Mistral · Ollama (local, no key)
See it in action
Phengos puts the whole workflow — context files, prompt, providers, and saved output — in one window, on your machine.
Verify exactly what each run produced
In Pro, every run is sealed with a cryptographic integrity record you can re-verify at any time — so a saved run is byte-for-byte what the model produced, not something edited after the fact. The kind of proof that matters for compliance, audit, research, and any work that has to be trusted later.
A record, not just a chat log
Every run is saved as a self-contained, reproducible folder, organized into projects and sessions you can revisit, search, and reuse.
Turn responses into files on disk
Generated code and content land straight in your project's output folder, tracked with the run that produced them.
Why Phengos, when there are free chat clients?
Most AI clients focus on conversation. Phengos focuses on work.
Plenty of free tools let you chat with multiple providers — that part is a commodity. Phengos is for the work that has to be trusted and reproduced: every run is saved with its inputs, outputs, files, metadata, and integrity records, so you can reproduce, verify, and reuse it later. If all you need is a chat window, there are plenty of free options — and the free Community edition covers that too. If you need a trustworthy record of exactly what your AI produced, that's what Pro is built for.
Pro is a one-time perpetual licence — you own this version forever, with no subscription. Buy it once and use Phengos on every platform it supports, desktop and mobile alike; there's no separate purchase per device or per OS.
Free to start
The Community edition is free and always will be — the full Phengos workspace, not a stripped trial. Download it from GitHub, bring your own Anthropic key, and run local models through Ollama at no cost, with unlimited generations. Your keys stay in your OS credential store and your work stays on your machine, exactly like Pro. The only limits are practical ones: up to five reference and five source files per run, and the persistent history, sessions, and integrity verification are reserved for Pro.
When you need all three online providers (Anthropic, OpenAI, Mistral), integrity verification, persistent reproducible history, and the full chat interface, Pro is $49 as an introductory price — a one-time perpetual licence (regular price $79).
Running a larger team, or need editable provider endpoints and dedicated support? Enterprise is available — see the editions page for details.
Download Community free · Compare editions
Text and code output
Phengos saves model output as text and code files. It is built for text-based work — writing, code, structured data as text — and does not produce binary office formats (such as .xlsx or .docx) as generated output.
Anthropic, OpenAI, Mistral, and Ollama are trademarks of their respective owners. Phengos is an independent client and is not affiliated with, endorsed, or sponsored by any of them.
