Plan your workouts, watch the form clips, and log what you lift. Runs on a Raspberry Pi on your own tailnet, alongside LifeOS and MTG Tracker. Nothing leaves the Pi except YouTube embeds, which your browser loads from YouTube.

Today asks which workout you are doing and walks you through it one exercise at a time:

• the exercise's clip at the top, looping silently
• its target (3 × 10 · 95 lb each side) and what you did last time
• a row per set, filled in with a best guess: the set above, else last time's, else the target. The usual case is one tap on ✓. −/+ move the weight by 5 lb, and a change carries down to the sets you have not ticked.
• Next / Back, or All exercises to jump anywhere

Every tick is saved as you go, so a locked phone, a reload or a different device picks up where you were. There is one workout under way at a time; the screen is kept awake while it is.

Finishing shows what you did and, for every exercise where you lifted more than the target, suggests raising it: Hip Thruster 95 lb → 100 lb [Set to 100]. Nothing changes unless you tap it. A lighter day never suggests lowering a target.

Plan is your workouts and their exercises: name, section (Before, After, Pick one), sets, reps, target weight and a note on it (each side), notes, and any number of clips:

Import from Google Sheets. In the sheet, File → Download → Comma-separated values, then pick the file on the Plan tab. It shows what it found before adding anything. The layout it reads:

Legs,,,                          a name in the first column starts a workout
,Squat-All glute regions,,       an exercise: the name, then notes after "-" or "("
,Before,,                        a label whose next line is indented further
,,15 Minute Walk,Low Intensity     is a section, and the lines under it are in it
,Hip Thruster,,,,95 lbs          a number with a unit in any later cell is the target
,,MC Gillis 3,,https://...       any link is a clip

A line that sits under no workout is listed as left out rather than dropped.

History lists finished workouts; open one for every set, and any target it still suggests raising.

Profiles keep people apart, as MTG Tracker's do: each has its own workouts and history. A new browser asks who is using it, and anyone can add themselves. It is separation, not a login. To start from a friend's plan, Plan → Copy a friend's workout copies it into yours, targets and clips included, to change as you like.

Weights are in pounds.

Open it in Safari (with Tailscale connected), Share → Add to Home Screen, and it installs as Gains: full screen, its own icon. If the Pi cannot be reached it shows a page saying so with Try again.

npm install
npm run dev          # http://localhost:3000
npm test

Runs under systemd as gains on 127.0.0.1:3002, from ~/development/gains. Unit files are in deploy/.

bash scripts/backup.sh --force
git fetch && git reset --hard origin/main
npm ci && npx next build
sudo systemctl restart gains

It has its own hostname, https://gains.<tailnet>.ts.net, from a separate Tailscale node on the same Pi, tailscaled-gains.service, in userspace mode with its own state and socket. This is the same arrangement as MTG Tracker's, for the same reasons (see its README). It serves the app with:

sudo tailscale --socket=/run/tailscale-gains.sock serve --bg 3002

To let a friend in without giving them the rest of your tailnet, share the gains machine with them from the Tailscale admin console.

Backups: gains-backup.timer runs scripts/backup.sh --verify nightly. It snapshots the database to ~/backups/gains/ (skipped when unchanged, newest 30 kept) and mirrors the clips to ~/backups/gains/media/, keeping any that were deleted from the app.

Profiles can also be managed on the Pi. Stop gains first, since two processes writing the WASM SQLite file at once is unsafe:

node scripts/profile.cjs list
node scripts/profile.cjs add kevin "Kevin"
node scripts/profile.cjs rename kevin "Kev"

Next.js 16, React 19, Tailwind 4, TypeScript. SQLite through node-sqlite3-wasm, since the native addon segfaults on the Pi.

MIT