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Independent iOS studio · since 2025

Small apps. Serious craft.

02apps is a tiny iOS studio building tools people actually open twice. Native SwiftUI, private by default, offline-first — and fast enough that logging a set, a feed or an expense takes a second, not a minute.

Multibaby app icon Strongbro app icon Simplebooks app icon Cashscreen app icon
The portfolio

Four apps.
Zero clutter.

Each one solves a single problem for a specific person — and refuses to grow into something bloated. Built, designed and shipped in-house.

Multibaby app icon
Health & Fitness

Multibaby: Two Baby Tracker

The baby tracker built for twins — and singletons too. Log feeds, sleep and diapers for each baby separately, then see them side by side. On-device AI learns each baby's rhythm and predicts the next nap before it happens.

Twins & multiples Voice logging Nap prediction WHO/CDC growth Family sync
App Store iOS 17.6+ · Free
Strongbro app icon
Health & Fitness

Strongbro: AI Workout Tracker

The workout tracker you talk to. Rack the bar, say “bench press, four sets of eight at 225” — logged. It understands real gym slang, catches every PR automatically, and ranks you up from Fresh Meat to Bro God as the plates add on.

Voice-first logging Auto PR detection AI physique scan 14 ranks Volume analytics
App Store iOS 18.2+ · Free
Simplebooks app icon
Business

Invoice Maker: Simplebooks

Everything a freelancer or small business actually needs, in one fast app. Professional PDF invoices and estimates in seconds, billable hours, IRS-ready mileage, expenses and clients — with reports that show what you really earned.

PDF invoices Estimates Time tracking Mileage & expenses Profit reports
App Store iOS 17.6+ · Free
Cashscreen app icon
Finance

Cashscreen: Expense Tracker

Logging a transaction is so fast you'll actually do it. Capture every coffee, subscription and splurge before you forget, then see exactly where the money went by category, period or your own tags — in any currency.

Seconds to log Custom tags Cash, cards & savings Multi-currency Budgets & goals
App Store iOS 18.6+ · Free
How we build

Three rules,
no exceptions.

01

Keep it simple

If a feature can't earn its place on the first screen, it doesn't ship. Every flow is measured in taps, and we keep cutting until it can't get shorter.

02

Private by default

On-device first, offline-first. Your data stays where it belongs, and nothing leaves the phone because it was convenient for us.

03

Fast or nothing

Native SwiftUI, no web wrappers, no loading spinners between you and your data. Instant launch, instant logging, instant answers.

Open for a good idea

Got something
worth building?

We take on a small number of outside projects a year — iOS only, and only when we'd use the thing ourselves. Tell us what you have in mind.

[email protected]