Yes, while we are getting started — the first 250 signups get lifetime Pro for free. After that, plans are $59/year or $100 lifetime, no card required to try.

What is the difference between the Free and Pro plans?

The Free plan gives you the core developer tools at no cost. Pro adds unlimited usage, private history, saved snippets, and priority support — all still fully offline on your device.

Your data stays on your device — there is no cloud sync. Vault-style data is additionally encrypted locally with a password only you know.

Do I need an account to use the tools?

Google Sign-In is required to save your data across sessions. Many public tool pages can be explored before opening the full app experience.

Does it work offline?

Yes. MyDevTools is a desktop app — most tools run fully offline on your machine. Tools that connect to external services or send API requests need a network connection.

All-in-One Developer Tools

80+ developer utilities in one desktop app. Runs fully offline and processes your data locally — nothing leaves your device.

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Bookmarks

Save and organize your favorite links and developer resources in one place.

Notes

Create and manage notes quickly. Markdown-supported note-taking for developers.

Code Snippet Manager

Save, edit, and copy code snippets with Monaco syntax highlighting, auto-detect language, view and edit modes, and format JSON, SQL, and more. Stored locally on your device.

Task Manager

Organize daily tasks, set priorities, and track your productivity. A to-do app built for developers.

API Keys

Store API keys and secrets per environment (dev / staging / prod). AES-256-GCM client-side encryption — server only sees encrypted blobs.

Email Validator

Verify and validate email addresses with MX record checks and RFC 5322 syntax validation.

Environment Manager

Organize environment variables by project and environment. Encrypted on your device with AES-256-GCM before sync.

JWT Decoder

Decode JSON Web Tokens locally: header, payload, exp, iat, and nbf. No server upload; signature not verified.

Certificate / PEM Decoder

Paste an X.509 PEM certificate or PKCS#10 CSR to inspect subject, issuer, validity, serial, SHA-256 fingerprint, and Subject Alternative Names. Runs locally on your device.

SSH / RSA Key Generator

Generate Ed25519 or RSA key pairs (2048/4096-bit) locally. Download private key (PKCS#8 PEM) and public key in OpenSSH and SPKI PEM formats. Nothing is uploaded.

Encryption Playground

AES-GCM encrypt and decrypt locally with a raw key (hex or Base64) or a passphrase (PBKDF2-SHA256 + AES-GCM). Outputs a small JSON bundle you can copy and decrypt locally—educational and occasionally practical. Nothing is uploaded.

Password Manager

Securely store and manage passwords with client-side AES-256 encryption. Zero-knowledge vault.

Bcrypt Generator & Checker

Generate bcrypt password hashes with a configurable cost factor and verify passwords against existing hashes. Runs entirely on your device.

JSON Editor

Format, validate, and edit JSON data with text and tree views. Supports JSONPath queries.

JSON Visualizer

Visualize JSON as an interactive node graph — pan, zoom, collapse, search, view arrays as tables, and export the diagram as PNG or SVG.

JSON Schema Generator

Generate JSON Schema (Draft 2020-12) and typed models for Python, TypeScript, Go, Rust, Java, C#, Dart, and Swift from sample JSON.

JSON to Code

Generate typed models — TypeScript, Go, Rust, Python, Java, Kotlin, Swift, and JSON Schema — from a sample JSON payload.

Beautify & Minify

Beautify or minify HTML, CSS, JavaScript, XML, and JSON in one tool with a language dropdown.

SQL Formatter

Pretty-print SQL locally with dialect-aware formatting for MySQL, PostgreSQL, and SQLite.

GraphQL Formatter

Format and minify GraphQL queries, mutations, and subscriptions with Monaco syntax highlighting and a simple query builder. Runs locally on your device.

YAML Formatter & Validator

Format and validate YAML locally. Supports pretty-printing, indentation control, and conversion to JSON. Nothing is uploaded.

Markdown Preview & HTML Converter

Live Markdown renderer with syntax highlighting, HTML export, and HTML → Markdown conversion. Runs entirely on your device.

Format Converter

Convert between JSON, YAML, TOML, and XML in any direction. All 12 combinations supported. Runs entirely on your device.

Text Diff Checker

Compare two texts side by side with additions and removals highlighted. Runs entirely on your device.

Regex Tester

Test JavaScript regular expressions with live match highlighting, flags (g, i, m, s, u), and match counts. Client-side only.

JSON Diff

Semantic JSON diff that ignores key order and formatting. See added, removed, and changed values with exact paths — runs entirely on your device.

JSONPath Playground

Query and extract data from JSON with JSONPath or JMESPath. Live results, match counts, and a built-in expression cheatsheet — all on your device.

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 strings instantly, with UTF-8 support. Runs entirely on your device.

URL Encoder / Decoder

Percent-encode or decode text for query strings and URI components with UTF-8 support.

URL Parser

Parse any URL into protocol, host, path, query parameters, and hash. Runs locally on your device.

Number Base Converter

Convert integers between number bases 2 through 36 with optional 0x/0b/0o prefixes. Runs entirely on your device.

Timestamp Converter

Convert Unix seconds or milliseconds, ISO-8601, and date strings. See UTC, local, and relative time with one-click copy.

Unit Converter

Convert between 323 units across 43 scientific and engineering categories including length, mass, pressure, viscosity, thermal, electrical, polymer, and materials science units.

CSV / Excel ↔ JSON Converter

Upload CSV or Excel files and convert to JSON, or export a JSON array of objects back to CSV and XLSX. Dates from Excel become ISO strings. Runs on your device.

Image to Base64 Converter

Convert images to Data URI or raw Base64 strings instantly. Drops local images and encodes them purely on your device.

String Case Converter

Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, and more.

Line Sort & Dedupe

Sort lines alphabetically or by length, remove duplicates, trim whitespace, and clean up lists locally.

String Inspector

Count characters, words, lines, and bytes, and reveal invisible or non-ASCII characters with their Unicode code points.

Escape / Encode

Escape and unescape HTML entities, backslash (JS/JSON) strings, hex ↔ ASCII, and Unicode \uXXXX sequences.

Chmod Calculator

Convert Unix file permissions between checkbox, octal (755), and symbolic (rwxr-xr-x) forms, including setuid, setgid, and sticky bits. Runs locally on your device.

Timezone Converter

Convert a date and time across multiple timezones at once, with UTC offsets, day-shift badges, and working-hours indicators for meeting planning.

LLM Token Counter

Count tokens for GPT-4o and GPT-4/3.5 encodings, approximate Claude tokens, visualize token chunks, and estimate API cost per call and per 1000 calls.

UUID / ULID Generator

Generate UUID v1–v7 or ULIDs with namespace options and bulk copy or download.

Secret / API Key Generator

Generate cryptographically random strings with a configurable alphabet and length. Bulk copy or download; pairs with the UUID generator.

QR Code Generator

Create PNG QR codes from any text or URL with error correction, colors, and margin. Runs entirely on your device.

.gitignore Generator

Generate .gitignore files instantly for a specific tech stack (Node, Python, macOS, etc.) or combination.

Docker Compose Generator

Pick PostgreSQL, Redis, NGINX, Kafka, Elasticsearch, Prometheus, Grafana, and dozens of other images — get a ready-to-edit docker-compose.yml for local development.

Lorem Ipsum Generator

Generate classical Lorem Ipsum as paragraphs, sentences, words, or lists. Export plain text or HTML.

Mock Data Generator

Build a field schema with dozens of data types, optional blanks, sequences, and export JSON, CSV, SQL, or XML up to thousands of rows — all locally on your device.

Cron Expression Builder

Build 5-field cron jobs with presets and quick picks, edit raw expressions, read plain-English schedules, and preview next run times.

Hash Generator

Compute MD5, SHA-1, SHA-256, SHA-384, and SHA-512 digests for text or files with hex output. All hashing runs locally on your device.

HMAC Generator

Compute HMAC-SHA1, HMAC-SHA256, HMAC-SHA384, and HMAC-SHA512 signatures in hex or Base64 for webhook signing and API integration testing. Runs entirely on your device.

TOTP / 2FA Code Generator

Paste a Base32 authenticator secret and see the current six-digit RFC 6238 TOTP code refresh every 30 seconds. SHA-1, 30-second step—ideal for testing MFA and sign-in flows. Runs entirely on your device.

Markdown Table Generator

Build Markdown tables in a spreadsheet-like editor. Paste from Excel or CSV, set column alignment, and copy pretty-aligned Markdown or HTML.

API Client

Test and debug HTTP requests with headers, body, and auth support. A lightweight Postman alternative for your desktop.

cURL to Code

Convert a curl command into ready-to-run request code for fetch, axios, Python, Go, PHP, Ruby, Java, and C#.

HTTP Status Codes Reference

Search and browse HTTP status codes (1xx–5xx) with short descriptions and RFC references.

DNS Lookup

Query DNS records for any domain: A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, and PTR. See TTL, mail server priority, and SOA details.

IP / Subnet Calculator

Compute IPv4 and IPv6 CIDR details: netmask, wildcard, broadcast, first and last host, and subnet size. Runs locally on your device.

User-Agent Parser

Paste a User-Agent string to see browser, OS, engine, device, and CPU breakdown instantly. Runs entirely on your device.

MIME Type Lookup

Look up MIME types by file extension or filename and copy the result instantly. Runs entirely on your device.

Webhook Tester

Create a temporary webhook URL, then capture and inspect incoming HTTP requests live — method, headers, query params, and body.

WebSocket Tester

Connect to any ws:// or wss:// endpoint, send and receive messages, pretty-print JSON, and auto-ping — all on your device.

Whois Lookup

Look up registration details for any domain or IP address using RDAP: registrar, status, key dates, nameservers, and contacts.

SQL Client

Connect to PostgreSQL, MySQL, and MariaDB databases from your desktop. Run queries, explore schemas, and export results. Credentials encrypted with AES-256 before storage.

Database Explorer

Explore and manage your MongoDB and SQL databases directly from your desktop.

S3 Drive

Manage AWS S3 and DigitalOcean Spaces buckets. Browse, upload, download, and delete files with end-to-end encrypted credentials.

Redis Commander

Browse keys, inspect values, run raw commands, and flush patterns against any Redis instance. Credentials are encrypted locally on your device.

Color Picker & Converter

Pick colors, convert between HEX, RGB, and HSL, and explore harmonic palettes — shades, complementary, triadic, and more.

WCAG Contrast Checker

Measure WCAG 2.1 contrast between two HEX colors, see AA and AAA pass/fail for normal and large text, and preview typography on the background.

CSS Gradient Builder

Visual CSS gradient builder with angle control, color stops, and one-click CSS copy.

Image Compressor

Compress JPEG, PNG, and WebP images locally on your device with an adjustable quality slider. No uploads.

SVG Optimizer / Minifier

Paste SVG markup and minify it locally with SVGO: drop comments, editor metadata, default attributes, and whitespace—then compare UTF-8 size before and after.

Code Screenshot

Create Carbon-style code screenshots with syntax highlighting, gradient backgrounds and window controls. Export as PNG, all on your device.

CSS Generators

Visual generators for CSS box-shadow layers, per-corner border-radius blobs, and fluid clamp() typography. Copy production-ready CSS instantly.

EXIF Viewer & Remover

View camera, GPS and EXIF metadata in your photos, then losslessly strip it. JPEG, PNG, WebP, HEIC and TIFF, all processed on your device.

Favicon Generator

Generate favicon.ico, Apple touch icons, PWA maskable icons plus manifest and HTML snippets from a single image. Runs entirely on your device.

Keycode Inspector

Press any key to inspect the JavaScript keyboard event: key, code, keyCode, which, location, and modifiers, with history and JSON export.