DevBuddy: Offline Dev Toolkit

CosmoVex

Contains adsIn-app purchases

About this app

DevBuddy is an offline developer toolkit with 27 utilities for everyday coding, debugging, and API work. No accounts, no cloud round-trips. Everything runs on your phone.

WHY OFFLINE
- Paste sensitive tokens, payloads, and secrets without sending them anywhere
- Works on flights, in tunnels, behind strict firewalls
- Nothing logs, nothing syncs, nothing leaves the device

WHAT'S INSIDE — 27 TOOLS

Formatters
- JSON formatter and validator
- XML formatter
- SQL formatter
- Markdown preview
- Diff tool with line-level compare

Encoders and Decoders
- Base64 encoder and decoder
- URL encoder and decoder
- HTML entity encoder and decoder
- JWT decoder (header, payload, signature)
- Markdown to JSON
- API payload explorer

Generators
- UUID generator (v1, v4)
- Hash generator (MD5, SHA-1, SHA-256, SHA-512)
- QR code generator
- Lorem ipsum generator
- Prompt template builder

Converters
- Unix timestamp converter (epoch, ISO, human-readable)
- Color picker (HEX, RGB, HSL)
- Number base converter (binary, octal, decimal, hex)
- YAML to JSON converter
- Text chunker for prompts and RAG workflows

Testers
- Regex tester with live match groups
- Token counter
- AI safety checker

Security
- TOTP tester for 2FA codes
- AES encrypt and decrypt
- HMAC generator and verifier

MADE FOR
- Developers and software engineers
- QA engineers and API testers
- DevOps and SREs on call
- Students learning JSON, regex, JWT, hashes
- Technical writers and prompt engineers

COMMON TASKS
- Pretty print and validate a JSON response
- Decode a JWT to inspect claims and expiry
- Test a regex against sample input with live highlighting
- Generate a UUID or strong hash for a quick script
- Convert a Unix timestamp during incident triage
- Encode or decode base64, URLs, and HTML entities
- Format SQL or XML before pasting into a ticket or PR
- Generate a QR code from any text or URL
- Verify a TOTP code against a shared secret
- Encrypt or decrypt text with AES, sign with HMAC

DARK MODE
DevBuddy runs in dark mode by default and follows your system theme.

LANGUAGES
Available in 14 languages: English, Hindi, Spanish, French, German, Portuguese, Arabic, Bengali, Indonesian, Japanese, Korean, Russian, Turkish, and Chinese.

PRIVACY
DevBuddy does not collect your inputs. Every tool runs locally on your device. No telemetry on tool content.

What’s new

Bug fixes and performance improvements