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, and no tracking.

On the App Store

Each one does a single job, on 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.

£1.99iPhone · iPad · Mac · Watch · Vision Pro
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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.

£6.99iPhone · iPad · Mac · TV
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Recast: Convert & Compress

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

FreeiPhone · iPad
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Refast: 16:8 Fasting Timer

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

FreeiPhone · Mac
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GainScout: BNG Land Finder

Check any field in England for biodiversity net gain potential, against official government data, with the source shown for every finding.

FreeiPhone · iPad · Mac
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Gridsong: Music Maker

Write music on a grid. Tap out a pattern, press play, keep going until it sounds right. Locked to a scale, so nothing you tap can sound wrong.

£1.99iPhone · Mac
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Coming soon

Finished, and on its way to the App Store.

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
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Latest update

All updates →

Runlow 1.8.5 · Themes, a setup wizard, and your Lock Screen card your way

Seven themes, nine typefaces, bars in blocks, a card that fits up to eight meters, and bigger widgets with a refresh button. With Apple for review now.

GainScout · Smoother by default

A progress bar while a check runs, a short walkthrough for anyone new, and quicker moves after saving a site or building a report. With Apple for review now.

Reprompt & Gridsong · Both are going free

Free downloads, with Pro as a single optional unlock you buy once. Already own either app? Pro comes with it, nothing more to buy.

GainScout and Gridsong · Both on the App Store

GainScout checks any field in England for biodiversity net gain potential against official government data. Gridsong is a music grid locked to a scale, so nothing you tap can sound wrong.

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.