Corti.com Apps

Small, focused utilities for Mac and iPhone, built by Sascha Corti. Free where possible, open source where it makes sense, and private by design throughout.

Jump to: CatPaws · PictureFramer · ZoomIt4Mac

CatPaws

Protect your work from curious cats.

macOS 14+ · Apple silicon & Intel · Free & open source

A menu bar app that detects when a cat walks on your keyboard — the characteristic pattern of multiple adjacent keys pressed simultaneously — and instantly locks all keyboard input before random cat-generated text lands in your documents.

Smart detection that distinguishes paws from normal typing
Locks input within milliseconds, with a clear on-screen notification
Unlocks automatically when the keys are released — or with a mouse click or 5× Esc
Adjustable detection sensitivity and launch at login
Statistics on your cat's keyboard visits
No data collection, no network access — everything stays on your Mac

Requires Input Monitoring and Accessibility permissions to detect keyboard patterns.

Download for Mac · Website · GitHub

PictureFramer

Photograph a painting at an angle. Get it back perfectly straight — frame, wall and all.

iPhone · iOS 17+

Made for museum days: PictureFramer finds the outer edge of the artwork, fixes rotation, horizontal and vertical keystone in a single transform, and keeps an adjustable strip of the real wall around the frame — not synthetic padding.

Automatic frame detection, with hand-adjustable corners
True perspective correction in one pass — not just a crop
Full-resolution output rendered from your original pixels
Works on unframed canvases too — anything with a clean rectangular edge
AI reflection removal: mark glare on protective glass and let AI repaint only the masked pixels
Bring your own OpenAI or Google Gemini API key, stored in the iOS Keychain

Straightening runs entirely on your iPhone — no accounts, no tracking. The optional reflection remover sends only the marked region to the AI provider you pick, with your own key, only when you tap Remove.

Website · Support

ZoomIt4Mac

The Sysinternals ZoomIt experience — native on your Mac.

macOS 14+ · Apple silicon & Intel · Free & open source · MIT

Zoom, draw, record and snip your screen straight from the menu bar — a native macOS re-implementation of the classic presentation tool, always one keystroke away.

Zoom ⌃1 from 1× to 8×, plus Live Zoom ⌃4 on moving content
Draw ⌃2: pen, lines, arrows, shapes in six colors, highlighter H and blur pen X
Type T directly on screen, resizable on the fly
Break Timer ⌃3 for workshop pauses
Snip ⌃6 to clipboard, or OCR Snip ⌃⌥6 for on-device text capture
Screen Recording ⌃5 / region ⌃⇧5 as compact HEVC with optional audio
Rebindable hotkeys with conflict detection, launch at login, automatic updates

brew install TechPreacher/tap/zoomit4mac

Download .dmg · Website · GitHub

ZoomIt is a Sysinternals tool by Mark Russinovich; ZoomIt and Sysinternals are trademarks of Microsoft Corporation. ZoomIt4Mac is an independent re-implementation for macOS and is not affiliated with or endorsed by Microsoft.