Cortex vs 
Nexa SDK
Cortex vs Nexa SDK compared for 2026 — features, license, ease of use, performance and which one to choose. Ollama-style runtime from the Jan team vs Run any model on any device — CPU, GPU, NPU.
Updated regularly · curated by OpenSourceAI.tech
Cortex vs Nexa SDK at a glance
| Spec | Cortex | Nexa SDK |
|---|---|---|
| Category | Run LLMs locally | Run LLMs locally |
| Type | Local runtime (CLI) | Local runtime (SDK) |
| License | Apache-2.0 | Apache-2.0 |
| Runs locally | Yes | Yes |
| Primary language | C++ | Python |
| Ease of use | Beginner | Intermediate |
| Best for | a clean Ollama alternative with swappable engines | developers targeting many device types from one codebase |
| GitHub stars | — | — |
How Cortex and Nexa SDK score
| Criterion | Cortex | Nexa SDK |
|---|---|---|
| Popularity | n/a | n/a |
| Maintenance | n/a | n/a |
| Ease of use | 5.0 | 3.5 |
| Privacy | 5.0 | 5.0 |
| License freedom | 5.0 | 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
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
Nexa SDK
Nexa SDK runs text, vision, audio and image models locally across CPU, GPU and NPU backends, with a single unified API and OpenAI-compatible server.
- Runs on NPUs, not just CPU and GPU
- One API for text, vision and audio models
- OpenAI-compatible local server
Key differences
Cortex is local runtime (CLI), while Nexa SDK is local runtime (SDK). Cortex leans more beginner-friendly, whereas Nexa SDK is more suited to intermediate users. In short, Cortex fits a clean Ollama alternative with swappable engines, and Nexa SDK fits developers targeting many device types from one codebase.
Which should you choose?
Choose Cortex for a clean Ollama alternative with swappable engines. Choose Nexa SDK for developers targeting many device types from one codebase.
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 Cortex or Nexa SDK easier to use?
Cortex is generally the easier of the two to get started with, while Nexa SDK rewards more setup with more control.
Are Cortex and Nexa SDK free?
Cortex is free and open source (Apache-2.0), and Nexa SDK is free and open source (Apache-2.0). Neither charges for the core software.
Can I run Cortex and Nexa SDK locally?
Cortex: yes · Nexa SDK: yes. Both can be used without sending your data to a third-party cloud where their setup allows.
Cortex vs Nexa SDK — which should I pick in 2026?
Choose Cortex for a clean Ollama alternative with swappable engines. Choose Nexa SDK for developers targeting many device types from one codebase.
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