Guidance vs 
Promptfoo
Guidance vs Promptfoo compared for 2026 — features, license, ease of use, performance and which one to choose. Interleave control and generation vs Unit tests for your prompts.
Updated regularly · curated by OpenSourceAI.tech
Guidance vs Promptfoo at a glance
| Spec | Guidance | Promptfoo |
|---|---|---|
| Category | LLM / RAG framework | LLM / RAG framework |
| Type | Constrained generation library | Prompt testing |
| License | MIT | MIT |
| Runs locally | Cloud-optional | Yes |
| Primary language | Python | TypeScript |
| Ease of use | Advanced | Beginner |
| Best for | developers scripting complex generation logic | teams shipping prompts to production |
| GitHub stars | 21.7k | 23.3k |
How Guidance and Promptfoo score
| Criterion | Guidance | Promptfoo |
|---|---|---|
| Popularity | 3.5 | 3.5 |
| Maintenance | 4.5 | 5.0 |
| Ease of use | 2.5 | 5.0 |
| Privacy | 3.5 | 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
Guidance
Guidance is a programming paradigm for steering LLMs that interleaves control flow with generation, with constrained decoding and rich templating.
- Fine control interleaved with generation
- Constrained decoding cuts token waste
- Works with local and hosted models
Promptfoo
Promptfoo runs your prompts against test cases across models, catching regressions before they reach production, and includes red-teaming checks.
- Regression tests for prompts
- Compares models side by side
- Built-in security red-teaming
Key differences
Guidance is constrained generation library, while Promptfoo is prompt testing. Guidance leans more advanced-friendly, whereas Promptfoo is more suited to beginner users. They also differ in how they run (Cloud-optional vs Yes). In short, Guidance fits developers scripting complex generation logic, and Promptfoo fits teams shipping prompts to production.
Which should you choose?
Choose Guidance for developers scripting complex generation logic. Choose Promptfoo for teams shipping prompts to production.
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 Guidance or Promptfoo easier to use?
Promptfoo is generally the easier of the two to get started with, while Guidance rewards more setup with more control.
Are Guidance and Promptfoo free?
Guidance is free and open source (MIT), and Promptfoo is free and open source (MIT). Neither charges for the core software.
Can I run Guidance and Promptfoo locally?
Guidance: cloud-optional · Promptfoo: yes. Both can be used without sending your data to a third-party cloud where their setup allows.
Guidance vs Promptfoo — which should I pick in 2026?
Choose Guidance for developers scripting complex generation logic. Choose Promptfoo for teams shipping prompts to production.
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