Plan and visualise an API latency budget. Enter a P99 target (e.g. ≤ 300ms) and per-stage allocations (DNS, TCP, TLS, TTFB, Processing, Network) to see a live waterfall, budget utilisation, and over-budget warnings. Optionally paste an OpenTelemetry or Datadog trace to reverse-engineer a measured allocation.

Development

Cron Expression Explainer

Parse a 5-part / 6-part / Quartz cron expression into a plain-language schedule description, show the field-by-field breakdown, and list the next N execution times in any IANA timezone — with an AI-generated natural-language explanation in your language

Development

ASCII Table Reference

Browse the complete ASCII character table (0–127) with decimal, hex, octal, binary, HTML entity, and control character names; filter by code or name

Development

API Response Diff & Semantic Analyzer

Compare two API response payloads, highlight field-level diffs, and classify likely functional changes versus harmless runtime drift

Development

API Contract Mutation Tester

Mutate OpenAPI request fields into semantically risky variants and optionally send them to a real backend to check defensive validation coverage

Development

API Response Contract Validator

Validate a real API response JSON against the response schema declared in an OpenAPI 3.x specification

Development

API Breaking Changes Detector & Migration Planner

Compare two OpenAPI 3.x schemas, identify breaking changes, grade client impact, and suggest migration or compatibility strategies

Development

Cron Job Simulator

Simulate the next runs of one or two 5-part cron expressions, highlight overlaps, and warn about overly dense schedules

Development

API Contract Stress Tester

Generate boundary-value test cases from an OpenAPI 3.x document and optionally send them to a real backend to spot contract mismatches

Development

Cron Expression Visualizer

Parse cron schedules, validate standard or Quartz syntax, and visualize the next execution times on a timeline and grouped calendar view

Development

API Doc Generator

Generate polished API documentation from OpenAPI or annotated comments