The 7 Dollar Habit — Small habits. Big numbers.

The calculator

Run the numbers on your habit. Live.

Type in what you spend. Pick how often. Watch fifteen years of compounding land on you all at once. Yes, it stings — that's the point.

How much does it cost?

$ per day

Time horizon 15 years

Annual return (if invested) 7%

If you invested it instead, in 15 years you'd have

$51,684

vs. $27,375 just sitting in a savings jar.

That's roughly a down payment on a starter home — built one cup at a time.

What's inside

Everything you need. Nothing you don't.

No social feed, no streak shame, no upsell pop-ups. Just the smallest possible loop: see the cost, log the day, watch it compound.

Live calculator

Type the amount. Pick a cadence. See 15 years of compounding instantly. Adjust the rate and horizon to match your reality.

Saved vs. invested

Track every day as redirected, saved, invested, or skipped. The chart splits both lines so you can see compound interest do its thing.

Habit calendar

A clean year-long heatmap per habit. Current streak, longest streak, total saved — all where you can glance at it.

Themes that unlock

Start in Habit Green. Hit a 3-day streak for Ocean. 7 days for Ember. 30 days for Rose. The reward for showing up is a nicer-looking app.

Lock-screen widgets

Your streak and savings, visible without unlocking. A small, quiet nudge in the right direction.

Yours, privately

No ads. No analytics on your habits. Export your data to CSV any time. Delete it forever in two taps.

A look around

Designed to be glanced at, not lived in.

Four screens, one job. Open it, log today, close it. The good kind of habit app.

Overview

Today, this month, 15 years

Calendar

A year at a glance

History

Every habit, every day

Settings

Themes, exports, the rest

How it works

Three taps to your reckoning.

01 — NAME IT

Pick the habit that's quietly draining you.

Coffee. Takeout. That subscription you forgot about. Whatever it is, give it a name and an amount.

02 — SEE IT

Watch 15 years of it land in one number.

The calculator runs the math instantly. No spreadsheet. No financial-advisor jargon. Just the cost.

03 — LOG IT

Tap once a day. Saved, invested, or skipped.

The streak builds. The number grows. Your future self quietly thanks you.

That $7 a day is costing you $51,684.

Run the numbers on your habit. Live.