Cog - Dev Toolbox

Offline dev tools, one tap

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

19 developer tools in one fast, offline app. JSON, Base64, JWT, hashes, regex, diff, UUID/ULID and more. No account, no tracking — everything runs on your device. Cog is a fast, offline toolbox for developers — a whole shelf of the little utilities you reach for every day, in one clean app. No account. No network. No tracking. Everything runs on your device. Stop pasting sensitive tokens and payloads into random websites. Cog does it all locally. FREE TOOLS • JSON — pretty-print, minify, sort keys • Base64 — encode & decode • URL encode / decode • HTML entities — escape & unescape • JWT decode — inspect header & claims (decode only) • Hash — MD5, SHA-1, SHA-256, SHA-512 • UUID — generate v4 • Epoch time — convert Unix timestamps ↔ dates • Case convert — camelCase, snake_case, kebab, PascalCase, CONSTANT • Slugify — clean URL-safe slugs • Color — HEX ↔ RGB ↔ HSL with a live swatch • URL parse — break a URL into its components COG PRO (one-time purchase — yours forever) • Regex tester — live match highlighting & capture groups • Diff — line-by-line comparison • HMAC — keyed hashing with your secret • Cron explainer — understand any schedule • ID Generator — ULID, NanoID, UUID v7 • Password generator — strong, configurable • Lorem Ipsum — placeholder text BUILT FOR SPEED • Search every tool instantly • Favorites for the tools you use most • Live results as you type • Home Screen widget & Share Extension — run a tool on selected text from any app • History of your recent conversions, stored locally PRIVATE BY DESIGN Cog makes zero network calls. Nothing you paste ever leaves your phone. No analytics, no ads, no accounts. One honest price for Pro. No subscription.

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The developer, Gregory Manley, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Gregory Manley
    Size
    • 2.2 MB
    Category
    • Developer Tools
    Compatibility
    Requires iOS 18.0 or later.
    • iPhone
      Requires iOS 18.0 or later.
    • iPad
      Requires iPadOS 18.0 or later.
    • Mac
      Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © Gregory Manley 2026
  • Developer Website
  • Privacy Policy

    • More by Gregory Manley