——— free developer tools

Calculators for platform engineers

Interactive tools for Kafka sizing, API design, and rate limiting. No signup. No paywalls.

9 tools live0 signups<1s to result

—— All tools

Kafka Message Size Calculator

Calculate Kafka message size, storage, bandwidth and optimal configuration. Compression, batching and replication.

kafka message size calculatorOpen↗

Predict when your consumer group will overflow. Size consumers and simulate failures before production incidents.

kafka consumer lag calculatorOpen↗

Optimal rate limits from traffic and consumers. Nginx, Kong, AWS snippets and IETF headers.

api rate limit calculatorOpen↗

Interactive SemVer: decide major, minor, or patch bumps with clear rationale for API changes.

api versioningOpen↗

Build your architecture from reference hop latencies and see instantly if you fit your SLA — interactive latency numbers for engineers.

latency budget calculatorOpen↗

Analyze JavaScript-style regex for catastrophic backtracking: scores from redos-detector, static heuristics, evil inputs, and bounded timing.

redos vulnerability testerOpen↗

Paste two JSON Schemas and instantly see which changes are breaking, which are safe, and why. No signup, no CLI.

api breaking change checkerOpen↗

Calculate the optimal max_connections, work_mem, and PgBouncer pool size for your PostgreSQL server. Get a ready-to-paste postgresql.conf snippet.

postgresql connection pool calculatorOpen↗

Calculate DORA tiers (Elite/High/Medium/Low) from 30/90-day numbers. Find your bottleneck and get a recommendation — no GitHub integration.

dora metrics calculatorOpen↗