Docker build context inspector
Explain missing or excluded Docker COPY sources using a local folder, Dockerfile and ignore rules.
See an example →Developer
Format JSON, convert CSV, compare text and check colour contrast locally. Selected tools have protected APIs.
Compose environment value explorer
Trace Docker Compose interpolation and service environment values through supplied files, shell fixtures and overrides locally.
See an example →npm workspace lockfile inspector
Explain how workspace dependency declarations map to supplied package-lock entries and identify missing or mismatched resolutions.
See an example →Avro migration replay
Replay sample records from a writer schema into a reader schema and inspect defaults, aliases, promotions and failures locally.
See an example →TypeScript configuration provenance explorer
Trace effective TypeScript settings back through inherited configuration files, with source locations and override history.
See an example →JUnit report comparison
Compare two local test reports to find new and resolved failures, ambiguous identities and duration changes.
See an example →OCI image archive inspector
Inspect local OCI and Docker-save archives, layer changes and the final path inventory without installing Docker.
See an example →ABNF grammar test bench
Run reusable pass/fail sample suites against an ABNF grammar, with failure offsets and successful rule spans.
See an example →Translation-file workbench
Edit Gettext PO translations and find missing, fuzzy or mismatched placeholders before export.
See an example →State-machine tester
Step through events in a deterministic state machine and generate shortest transition test sequences.
See an example →Prisma schema visualizer
Turn a Prisma schema into draggable UML and entity relationship diagrams with arranged SVG, reloadable layout JSON and Mermaid exports.
See an example →SQL schema diagrammer
Turn SQL table definitions into a diagram of tables, keys and declared relationships.
See an example →Protocol Buffers message workbench
Decode binary Protocol Buffers messages or encode validated JSON with a supplied schema.
See an example →WebAssembly module inspector
Inspect imports, exports, section sizes and memory declarations, and export readable WAT without running the supplied module.
See an example →OpenAPI change checker
Compare two OpenAPI 3.1 JSON specifications and flag potentially breaking changes and unsupported cases.
See an example →Local application-log explorer
Map JSONL log fields, filter a chronological timeline and inspect repeated error messages without uploading logs.
See an example →Offline certificate inspector
Inspect the subject, issuer, names, validity dates and SHA-256 fingerprint of a local public certificate.
See an example →Binary file/hex inspector
Browse local byte ranges, search hexadecimal sequences and decode numeric values with explicit byte order.
See an example →Local SQL workbench
Query CSV and Parquet files, join local tables and export results with DuckDB in your browser.
See an example →HAR performance viewer
Inspect local browser network logs for slow requests, timing phases and transferred bytes.
See an example →Keyboard event tester
Highlight pressed keys and inspect modifiers, repeats and a downloadable local keyboard test session.
See an example →Local MongoDB-style workbench — CamaDB
Import JSON collections, browse documents, run supported CamaDB queries, preview edits and export JSON locally.
See an example →Sprite-sheet packer
Pack small graphics into an atlas PNG and download a frame-coordinate JSON index.
See an example →IPv4 subnet calculator
Convert CIDR prefixes and netmasks, calculate address ranges and check whether an IPv4 address belongs to a subnet.
See an example →Text comparison
Find added and removed words or lines, privately in your browser.
See an example →CSV ↔ JSON converter
Convert CSV and flat JSON with delimiter controls, source-positioned CSV errors, previews and local downloads.
See an example →Colour contrast checker
Check text and background colours against WCAG AA and AAA contrast thresholds.
See an example →JSON formatter
Turn a wall of JSON into something you can read. Validate, format, and copy.
See an example →