Prompttools
Open-source Python tools for testing and evaluating models, vector DBs, and prompts.
Pricing
Free tier
Flat rate
Adoption
↘CoolingLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is Prompttools?
Prompttools is an open-source library that provides developers with the necessary tools to test and evaluate various AI models, vector databases, and prompts. It simplifies the process of ensuring these components meet performance standards before deployment.
Key differentiator
“Prompttools stands out as an open-source, Python-centric tool specifically designed for the rigorous testing and optimization of AI models and vector databases, offering flexibility and depth in performance analysis.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
API requires Python-specific patterns, TypeScript SDK is community-maintained
v0.1 to v0.2 migration required rewriting chain definitions
Examples in the official docs are basic, lack detailed explanations for complex configurations
Testing on large vector databases can lead to significant slowdowns and increased memory usage
Fit analysis
Who is it for?
✓ Best for
Developers who need to rigorously test and evaluate their AI models before deployment
Data scientists looking to optimize prompt generation for machine learning tasks
Teams working with vector databases that require performance testing
✕ Not a fit for
Projects requiring real-time model evaluation (batch processing only)
Users seeking a cloud-based service rather than a local library solution
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Alternatives
Next step
Get Started with Prompttools
Step-by-step setup guide with code examples and common gotchas.