PrismCat is a self-hosted, transparent proxy and debugging console for LLM APIs. Change one line — your base_url — and instantly see every request and response between your app and OpenAI / Claude / Gemini / Ollama / any LLM API, including streaming (SSE).
Publisher’s description
What is PrismCat?
PrismCat is an open-source ai assistants & llm program for Windows from Etgpao. It is written in TypeScript.
Installation and requirements
Official installers exist for 64-bit as Portable. It runs without installation (portable).
Updates and version history
The current version is 1.15.0, released on September 4, 2026. 15 versions are listed since March 6, 2026, each with links to its own installer files.
Popularity and file types
The source code on GitHub (paopaoandlingyia/PrismCat) has 133 stars. Similar programs include Claude Code, Codex CLI and ChatGPT.
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Portable: runs without installation
- Updated in the last two months
Cons
- No native ARM64 build
In short: PrismCat is an open-source ai assistants & llm tool for 64-bit PCs.
Is PrismCat safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
5F0819FACAB307D50ED641863CE1B55329B66161B10BC32C2C93ACE47BACE089· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 15 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 1.15.0Latest | September 4, 2026 | — | 64-bit Portable |
| 1.14.0 | August 14, 2026 | — | 64-bit Portable |
| 1.13.0 | August 11, 2026 | — | 64-bit Portable |
| 1.12.0 | July 16, 2026 | — | 64-bit Portable |
| 1.11.1 | July 10, 2026 | — | 64-bit Portable |
| 1.10.0 | June 5, 2026 | — | 64-bit Portable |
| 1.9.0 | May 29, 2026 | — | 64-bit Portable |
| 1.8.0 | May 21, 2026 | — | 64-bit Portable |
Install from the command line
Silent install ›winget install --id paopaoandlingyia.PrismCat -eProgram files (.exe): prismcat.exe
Related guide: How to use winget: install and update apps
Information
- Publisher
- Etgpao
- Category
- AI assistants & LLMs
- Licence
- MIT
- Price
- Free
- Source code
- github.com/paopaoandlingyia/PrismCat
- Written in
- TypeScript
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- Portable
- Version
- 1.15.0
- Released
- September 4, 2026
- Added to the catalogue
- April 7, 2026
- Versions listed
- 15
- GitHub stars
- 133
- GitHub forks
- 19
- Website
- github.com
- winget ID
- paopaoandlingyia.PrismCat
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is PrismCat free?
Yes. PrismCat is open-source software under the MIT licence.
Is PrismCat safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install PrismCat with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Does PrismCat run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of PrismCat?
The versions page lists all 15 versions with links to their official installer files, back to March 6, 2026.
Can I use PrismCat without administrator rights?
Yes, it is portable: unpack and run it.
What are alternatives to PrismCat?
Claude Code, Codex CLI, ChatGPT, GPT4All and Jan. The alternatives page compares them.
