Independent App Studio

We build apps
people love to use.

Crafting native iOS apps with Swift and SwiftUI. Focused on clean design, great performance, and experiences that feel right.

See Our Apps Learn More

Our Work

Apps we've built and shipped.

📚 ReviseIt

A smarter way to study.

Flashcards, multiple choice quizzes, and exam practice with intelligent keyword matching. Create study sets, scan notes from photos, and track your revision progress — all designed to help you actually remember what you learn.

  • ✦ Interactive flashcards with flip-to-reveal
  • ✦ Multiple choice quizzes from your own sets
  • ✦ Exam mode with keyword mark schemes
  • ✦ Create notes from photos
ReviseIt home screen
ReviseIt flashcards
ReviseIt multiple choice
ReviseIt exam practice
PinIt Map with pinned location
📍 PinIt Map

Your world, pinned.

Save and organise the places that matter to you. Drop pins, add notes, and navigate back to them whenever you need — all on a beautiful interactive map.

SpendIt Tracker expenses list
SpendIt Tracker spending breakdown
💰 SpendIt Tracker

Know where your money goes.

Log expenses, view category breakdowns, and track spending by week, month, or year. Simple budgeting that actually makes sense.

SpinIt Wheel with custom options
🎡 SpinIt Wheel

Let the wheel decide.

Create custom wheels with your own options, hit spin, and let fate choose for you. Perfect for quick decisions, games, or just a bit of fun.

About

Built in the UK.
Made for everyone.

GrumpyFishDev is an independent app studio. We specialise in building native apps for iPhone, iPad, and Mac using Swift and SwiftUI.

We believe great software comes from caring deeply about the details — from pixel-perfect design to rock-solid performance. Every app we ship is something we're proud of.

The Developer

Hi! I'm Maddie — an LGBT university student and the solo developer behind GrumpyFishDev. I build these apps between lectures, late-night study sessions, and too much coffee. If you enjoy my work and want to support an indie dev, you can buy me a coffee.

☕ Buy Me a Coffee
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Native First

Built with Swift and SwiftUI, taking full advantage of Apple platforms.

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Quality Over Quantity

We'd rather ship one great app than ten mediocre ones.

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User Focused

Every decision starts with what's best for the people using our apps.

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Privacy Matters

Your data stays on your device. No tracking, no ads, no compromises.

Contact

Want to say hello?

Whether you have a question about one of our apps, want to report a bug, or just fancy a chat — we'd love to hear from you.

hello@grumpyfish.uk