280+ Offline Dev Tools

280+ Offline Dev Tools puts the utilities you reach for every day on your phone: format JSON, decode a JWT, test a regex, convert timestamps, generate UUIDs, inspect a hex dump and a lot more. Every tool runs on your device, so it works on a plane, on a locked-down network, or anywhere you have no signal.

WHY DEVELOPERS KEEP IT INSTALLED

• Works offline. No connection needed for the tools.

• Private. No account, no sign-up, and what you type into a tool is never uploaded.

• Fast. Lightweight tools update as you type, and results copy or share in one tap.

• Share text from any app straight into a tool.

• Search, favorites and recents get you to the right tool in seconds.

• Tap Sample in any tool to see how it works.

WHAT'S INSIDE

FORMATTERS & VALIDATORS

Beautify, minify and validate JSON, XML, YAML, SQL, HTML and CSS.

CONVERTERS

Switch between JSON, YAML, XML and CSV, convert units and number bases, turn cURL into code.

ENCODERS & DECODERS

Base64, URL, JWT, Unicode, hex, QR codes and classic ciphers.

HASHING, CRYPTO & SECURITY

Hashes, HMAC, password generator, AES, key generation, bcrypt, scrypt, Argon2 and an encrypted vault.

GENERATORS

UUIDs, fake data, lorem ipsum, licenses, .gitignore files, Dockerfiles and project boilerplate.

TEXT, DIFF & REGEX

Regex tester, text and JSON diff, find and replace, counters and slug tools.

DATE, TIME & CRON

Unix timestamps, time zones, date math and a cron explainer with next run times.

WEB & FRONTEND

Color converter, contrast checker, gradients, CSS generators, meta tags and SVG tools.

NETWORKING & APIs

Subnet calculator, URL parser, REST client, DNS lookup, ping, port check and OpenAPI viewer.

DATA & DATABASES

JSONPath, jq-style filters, XPath, SQL helpers and a SQLite playground that runs on your phone.

MATH & CS CALCULATORS

Programmer and scientific calculators, bitwise tools, IEEE 754 inspector and matrices.

CODE EDITING & ANALYSIS

Code runner, secret scanner, complexity checker, stack trace parser and log viewer.

BINARY & LOW-LEVEL

Hex dumps, struct layout, Protobuf, CBOR, ASN.1, compression and a file inspector.

MOBILE & LANGUAGE HELPERS

plist and localization converters, deep-link builder and Gradle snippets.

GIT & DEVOPS

Semver, commit linter, changelog, docker-compose, Kubernetes and GitHub Actions generators, .env manager.

CHEAT SHEETS & REFERENCE

Quick references for Git, HTTP, Linux, regex, CSS, Docker, OWASP and more.

LEARN & PRACTICE

Algorithm visualizers, recursion trees, a DFA simulator and flashcards.

PRODUCTIVITY

Pomodoro timer, command templates and tool pipelines.

FREE AND PRO

Free: a large set of everyday tools, supported by a small banner ad.

Pro: one payment, no subscription. It unlocks all the advanced tools (code runner, SQLite playground, REST client, secure vault, Argon2, bcrypt, scrypt, Protobuf and CBOR decoders and more), removes every ad, and includes the Pro tools we add in the future. You can restore it any time with the same Google account.

PRIVACY

The tools never upload what you type. The free version shows ads from Google AdMob, with a consent prompt where required. A few optional tools (REST client, DNS lookup, ping and port check) connect only to the address you enter, when you tap Run.