Domain

Programming tools.

Encoders, regex, cron, schema converters and developer productivity utilities.

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APIEvery tool
API Testing Tool

Free in-browser API testing tool (Postman alternative). Fire HTTP requests (GET, POST, PUT, DELETE, etc.) against any URL straight from your browser with custom headers and body.

4 inputs
Cron Expression Builder

Build a cron expression part-by-part, get a plain-English description, and preview the next five scheduled runs in your timezone. Handles ranges, lists, step values, and named days.

6 inputs
Git Diff ↔ Patch File Converter

Convert raw git diff output to downloadable .patch files or compare code snippets to generate patches 100% client-side. Find common git diff commands.

5 inputs
LLM API Cost Calculator

Estimate monthly API cost for any LLM workload across Anthropic and OpenAI models. Includes prompt-cache and batch-API math so you see what you actually pay — not just the headline rate.

6 inputs