Jan vs Cortex
Jan vs Cortex compared for 2026 — features, license, ease of use, performance and which one to choose. Open-source, offline ChatGPT-style desktop app vs Ollama-style runtime from the Jan team.
Updated regularly · curated by OpenSourceAI.tech
Jan vs Cortex at a glance
| Spec | Jan | Cortex |
|---|---|---|
| Category | Run LLMs locally | Run LLMs locally |
| Type | Desktop app (open source) | Local runtime (CLI) |
| License | AGPL-3.0 | Apache-2.0 |
| Runs locally | Yes | Yes |
| Primary language | TypeScript | C++ |
| Ease of use | Beginner | Beginner |
| Best for | users who want an open-source LM Studio alternative | a clean Ollama alternative with swappable engines |
| GitHub stars | 43.6k | — |
Feature comparison
| Feature | Jan | Cortex |
|---|---|---|
| Runs locally | ✓ | ✓ |
| Graphical UI | ✓ | ✗ |
| OpenAI-compatible API | ✓ | ✓ |
| Docker | ✗ | ✓ |
| GPU acceleration | ✓ | ✓ |
| Built-in model library | ✓ | ✓ |
How Jan and Cortex score
| Criterion | Jan | Cortex |
|---|---|---|
| Popularity | 4.0 | n/a |
| Maintenance | 5.0 | n/a |
| Ease of use | 5.0 | 5.0 |
| Privacy | 5.0 | 5.0 |
| License freedom | 3.5 | 5.0 |
Scores are computed automatically from public signals — GitHub stars (popularity), recent commit activity (maintenance), license type (freedom), local-first design (privacy) and onboarding complexity (ease of use). Indicative, not a verdict.
What each one is
Jan
Jan is a fully open-source desktop assistant that wraps local models in a clean ChatGPT-style UI, with a built-in model hub and an optional local API server.
- Fully open source with a clean desktop UI
- Local API server and optional cloud model hybrid use
- Privacy-first, works entirely offline
Cortex
Cortex is a local AI engine with a simple CLI, an OpenAI-compatible API and multiple backends (llama.cpp, TensorRT-LLM), designed to power the Jan desktop app or run standalone.
- Multiple inference engines behind one CLI
- OpenAI-compatible server out of the box
- Backed by the team behind the Jan desktop app
Key differences
Jan is desktop app (open source), while Cortex is local runtime (CLI). Their licenses differ (AGPL-3.0 vs Apache-2.0), which matters if you ship a commercial product. In short, Jan fits users who want an open-source LM Studio alternative, and Cortex fits a clean Ollama alternative with swappable engines.
Which should you choose?
Choose Jan for users who want an open-source LM Studio alternative. Choose Cortex for a clean Ollama alternative with swappable engines.
There is rarely one winner — many setups use both. The right pick depends on your hardware, your team's skills, and whether you value simplicity or control.
Frequently asked questions
Is Jan or Cortex easier to use?
Both sit at a similar level (Beginner). Your choice should come down to fit rather than difficulty.
Are Jan and Cortex free?
Jan is free and open source (AGPL-3.0), and Cortex is free and open source (Apache-2.0). Neither charges for the core software.
Can I run Jan and Cortex locally?
Jan: yes · Cortex: yes. Both can be used without sending your data to a third-party cloud where their setup allows.
Jan vs Cortex — which should I pick in 2026?
Choose Jan for users who want an open-source LM Studio alternative. Choose Cortex for a clean Ollama alternative with swappable engines.
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