Free Tools
Developer utilities, built for the real stack.
Fast, zero-tracking, client-side developer utilities designed for backend engineers, DevOps specialists, and AI builders. No popups, no signups required.
JWT Decoder
Decode and inspect JSON Web Tokens instantly in your browser. Pure client-side parsing with expiration countdown, header/payload breakdown, and claim formatting. Zero network requests.
JSON to TypeScript
Convert JSON objects into clean, strongly typed TypeScript interfaces or type aliases. Handles deep nesting, union types, optional fields detection, and array type inference.
Cron Expression Generator
Interactive visual cron schedule builder and human-readable cron expression translator. Preview the next 5 execution timestamps and pick from standard production presets.
Regex Generator & Tester
Interactive regular expression builder, tester, explainer, and multi-language code generator. Real-time match highlighting, capture group extraction, and preset library.
UUID & ULID Generator
Generate and decode RFC 9562 UUIDv7 (timestamp-ordered), RFC 4122 UUIDv4, ULID, and NanoID. Zero B-Tree index fragmentation for modern database primary keys.
System Design Capacity Calculator
Calculate throughput (QPS), Peak multipliers, ingress/egress network bandwidth, 5-year storage growth with replication, and 80/20 cache RAM sizing.
Cloud & AWS Cost Calculator
Model realistic monthly and annual AWS cloud infrastructure budgets for Compute (EC2), RDS Databases, Redis Caches, S3 Storage, and Bandwidth Egress.
Dockerfile & Compose Generator
Generate hardened, multi-stage production Dockerfiles for Node.js, Go, Python, and Rust with unprivileged non-root users and companion docker-compose.yml files.
Encoder, Decoder & Hash Suite
Pure client-side Base64/Base64URL encoder, URL percent encoder, Hex converter, and SHA-256 / SHA-512 / HMAC cryptographic digest generator.
LLM Cost Calculator
Interactive token pricing matrix for OpenAI, Anthropic, Google Gemini, DeepSeek, and open-source models. Calculate cost per request, monthly bill estimates, and prompt caching savings.