Codeflash
AI-powered code optimization that helps you always ship performant code
Founded
2023
Starting Price
$0
Category
AI Coding Assistants
Last updated March 4, 2026
About Codeflash
Codeflash automatically discovers the fastest version of your Python, JavaScript, and Java code using AI-powered optimization workflows. It generates multiple optimization proposals via large language models, validates correctness through comprehensive regression testing, benchmarks performance improvements, and delivers merge-ready pull requests with zero runtime overhead.
Pros & Cons
Pros
- Verifies correctness before suggesting changes, reducing risk of introducing bugs
- Zero runtime overhead — optimizations happen at development time only
- Strong CI/CD integration via GitHub Actions for incremental adoption
- Free tier available for open-source and public projects
Cons
Key Features
Automatic Code Profiling
Identifies performance bottlenecks across entire codebases or individual scripts
AI-Generated Optimizations
Uses LLMs to generate multiple optimization proposals for each function, selecting the best-performing one
Correctness Verification
Runs existing tests plus generates comprehensive regression tests to guarantee identical behavior
GitHub Actions Integration
Automatically optimizes new code in pull requests via a CI/CD workflow
VS Code Extension
Continuous optimization directly in the editor during development
Multi-Language Support
Supports Python, JavaScript, TypeScript, Java, and Go
Zero Runtime Overhead
All optimization happens at development time with no performance penalty in production
Pricing
Free
$0
- 25 function optimization credits/month
- Community support
- Public GitHub repos only
Pro
$20/user/month
Best For
Python Performance Optimization
Automatically optimize Python backend services, ML pipelines, and numerical computing code
CI/CD Performance Gates
Prevent performance regressions by automatically optimizing new code in pull requests
Legacy Code Speedup
Profile and optimize existing codebases to find quick performance wins without manual effort
