Build a Habit Tracker App With Claude (Charts, Streaks, Your Data)

A real personal app: daily check-ins, streak counting, progress charts, and data export — in one file that's yours forever. The template for every 'tracker' app idea you have.

DifficultyBeginner+

Time90 min

You'll needClaude (free tier works) · A browser

You'll buildA polished habit tracker: add habits, check them off daily, see streaks and a month grid, chart your consistency, and back up your data — no account, no subscription, no server.

Tracker apps are a $5/month subscription category built on functionality that fits in one HTML file. Habits, mood, expenses, workouts, reading — the architecture is identical: a list of things, dated check-ins against them, and views that summarize. Build this one and you've built them all.

Step 1 — The build prompt

Build a habit tracker as a single HTML file (HTML/CSS/JS, Chart.js from the cdnjs CDN allowed, no other libraries). Features: add/archive habits; a 'today' view with one-tap check-off per habit; current streak and best streak per habit; a GitHub-style month grid of completions; a Chart.js line chart of weekly completion rate; all data in localStorage; an Export Data button that downloads everything as JSON and an Import button that restores it. Design: calm, modern, mobile-first — this will be used on a phone every morning. Output the complete file.

Worth knowingThe export/import buttons are non-negotiable in any localStorage app. Browser data can be wiped by a cache clear; one JSON backup button turns 'lost six months of streaks' into a non-event. Demand it in every personal app you build.

Step 2 — Understand where your data lives

localStorage means the data is inside this browser on this device — no account, total privacy, works offline. The honest trade-offs: it doesn't sync between your phone and laptop, and it dies with the browser profile. For a personal tracker, export-to-JSON weekly is a perfectly good backup strategy. When you genuinely need sync, that's the Supabase tutorial — same app, cloud spine.

Step 3 — Iterate toward the app you'd actually use

First draft will be generic. Make it yours, one request at a time: 'habits should have optional reminder times shown on the today view', 'add a notes field per check-in', 'weekends shouldn't break streaks for habits marked weekdays-only', 'dark mode that follows system preference'. Five rounds in, it fits your life better than anything in the App Store — because it was specified by its only user.

Step 4 — Put it on your phone

Upload the file to any host (or free static hosting — see the hosting guide), open it on your phone, then Share → Add to Home Screen. It gets an icon and opens full-screen like a native app. Ask Claude to 'add a web app manifest and meta tags so this installs cleanly to a phone home screen with a custom icon and name' for the polished version.

Step 5 — Fork the pattern

Now reread your file's structure: items + dated entries + summary views. Swap the nouns and reprompt: expenses with categories and a monthly pie chart; workouts with sets and personal records; books with pages read and a yearly goal bar. Each fork is a 20-minute conversation, because the architecture — the hard part — is already proven.

Keep going

Need somewhere to put it live? See where to host AI-built sites. Compare tool costs on the pricing tracker (or stick to the free options), then pick your next build.