Lift 404

A minimal workout tracker for iPhone, inspired by Liftoff. I was tired of paying a subscription for features that boil down to "log your sets and see them on a calendar," so I built my own with **Expo (React Native)

• TypeScript**. Everything lives on the phone — no account, no server, no internet required.

What it does

Home — create reusable routines (a named list of exercises) and start a workout, either empty or pre-loaded from a routine. A couple of stat cards up top show how many sessions you've logged and when you last trained.

Live workout — a big running timer starts the moment you begin. Add exercises as you go and log each set with dropdowns for weight and reps, while a PREV column reminds you what you hit last time. End the workout and it saves to today's date along with how long you trained.

Rest timer — pick a preset (30s / 1m / 1:30 / 2m / 3m) and it auto-starts the instant you check off a set, then buzzes when rest is up. It's driven off the wall clock so it stays accurate even after the app is backgrounded, and it schedules a local notification so you're still alerted while you're in another app.

Calendar — a "Memories"-style grid where every day you trained shows a drawn badge of that workout: a color-coded, hand-authored SVG icon per muscle group (chest, back, legs, arms, core, cardio). Tap a trained day to revisit that session — exercises, sets, volume, and duration — and see running totals for days trained and total time.

Engineering notes

• Expo + React Native + TypeScript, using Expo Router for file-based navigation (bottom tabs for Home and Calendar, plus a full-screen workout and per-session detail routes).
• Local-first storage — routines and sessions are persisted to AsyncStorage. There's no backend to run or pay for, and the app works entirely offline.
• Wall-clock rest timer — the countdown is anchored to an end timestamp rather than a decrementing counter, so it survives the JS timer being suspended when iOS backgrounds the app, and re-syncs on foreground.
• Persistent workout state — the running session lives in a React context that persists, so the timer keeps going even if the app is restarted mid-set.
• Drawn muscle-group badges — each exercise is classified into a muscle group by name, and every group has its own original SVG glyph and color, so workouts read at a glance with no image assets or licensing.

The whole thing runs free-forever inside Expo Go, so I can use it on my own phone today without an Apple Developer account. The full write-up on how it works — and why I stopped paying for Liftoff — is over on the dev log.