Cog - Dev Toolbox
Offline dev tools, one tap
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
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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Cog now works with Shortcuts.
• Shortcuts & Siri — every tool is a Shortcuts action. Build automations
like "hash my clipboard" or "decode this JWT", or just ask Siri.
• Lock Screen control — add Cog to your Lock Screen or Control Center
for one-tap access.
• Four new free tools — Text Stats, Number Base (bin/oct/dec/hex),
Line Tools (sort, dedupe, reverse, trim), and JSON Escape.
• Accessibility — full VoiceOver labels throughout the tool grid.
As always: no account, no tracking, and everything runs on your device.
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.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Gregory Manley
- Size
- 2.4 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.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Cog Pro $9.99
- Copyright
- © Gregory Manley 2026