Apps for Apple platforms

Tools that do one job, beautifully.

Puff Labs builds focused apps for iPhone, iPad, Mac, Apple Watch and Apple Vision Pro. Every one of them keeps your data on your device. No account to create, no tracking, no subscriptions.

On the App Store

One purchase covers every device it runs on.

Runlow: AI Usage Meter

See how much of your Claude, Codex, Gemini, Cursor, Copilot and OpenRouter usage is left, at a glance, on every device you own.

£0.99iPhone · iPad · Mac · Watch · Vision Pro
›

Reprompt: Teleprompter

A teleprompter for people who film themselves. On the Mac it is a proper Mac app, with a real menu bar and real keyboard control.

£14.99iPhone · iPad · Mac · TV
›

Recast: File Converter

Convert almost any file on your iPhone. Everything happens on the device, so nothing you convert ever leaves it.

£1.99iPhone · iPad
›

Coming soon

Built and with Apple for review.

Merestone

Habitat and protected site mapping for ecologists, built for the field. Works fully offline and exports a desk study as a PDF when you are back at the laptop.

iPhone · iPad · Mac

GainScout

Find land with biodiversity net gain potential, with the habitat and constraint data already layered on the map.

iPhone · Mac

Refast

A 16:8 fasting timer that shows you the one thing you actually want to know: how long is left.

iPhone · Mac

Recomp

Make videos and photos smaller without watching the quality fall apart. On your device, like everything else here.

iPhone · iPad

Gridsong

Write music on a grid. Tap out a pattern, press play, keep going until it sounds right.

iPhone · Mac

Latest update

All updates →

Runlow 1.7 · A proper meter for OpenRouter

See what you have spent today, this week and this month, plus your credit balance and a heads up before a key expires.

About

Puff Labs is a small independent studio based in the UK, run by Leon Figueira. The person who answers your email is the person who built the app. Every app here works entirely on your device, with nothing sent to a server of ours, because the best way to keep your data private is not to collect it.

Something not working, or an idea for what to build next? Get in touch.