| What it does | Free online developer tools that run privately in your browser
| A Rust performance profiler for finding CPU, memory, async, SQL, HTTP, I/O and lock bottlenecks
|
|---|
| Key features | - JSON formatter, validator, and converter to YAML, CSV or TypeScript
- JWT decoder for inspecting token header, payload and expiry
- QR code and barcode generator with custom colors and download options
- Image compressor for batch processing to WebP, JPEG or PNG with quality slider
- curl converter between curl, fetch, axios, Python, Go, Node and PHP
- Hash generator supporting MD5, SHA-1, SHA-256, SHA-384, SHA-512
- Cron expression builder and parser with next run times
- JSON diff tool with structural comparison and collapsible tree
- SQL formatter and dialect converter for MySQL, PostgreSQL, SQLite and SQL Server
- Certificate decoder for PEM certificates, chains and CSRs with SANs and fingerprints
| - Time, CPU & memory profiling
- Async observability for futures, channels and streams
- I/O monitoring for files, TCP and compression streams
- SQL query profiling for sqlx and Diesel
- HTTP calls profiling for reqwest and ureq
- HTTP server profiling for axum routes
- Concurrency metrics for Mutex and RwLock
- Tokio runtime monitoring
- Prometheus & Grafana integration
- CI regression detection with automatic benchmarking
|
|---|
| What makes it different | - All tools run client-side in your browser with no data uploads to servers
- Fast static site served from global edge network with no sign-up required
- Clean interface available in 10 languages with dark mode and keyboard shortcuts
- Free to use forever with non-intrusive ads never accessing tool data
- Built as static Next.js export preventing server-side processing of sensitive data
| - No overhead when disabled—all macros compile to no-ops
- Deterministic instruction counts with Callgrind for stable CI regression checks
- Instruments real applications with real workloads, not isolated benchmarks
- MCP server for AI agent integration
- Live TUI dashboard and static reports
|
|---|