By Day

By Day

One change at a time, measured

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Free
In-App Purchases

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Released
September 24, 2026
Updated
September 27, 2026

Features

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About

Pick one thing to improve. See whether it actually moved. By Day gives you a 21-day plan for one problem at a time: up to three small habits a day, each with plain instructions, and a recap at the end that compares you with your own baseline rather than a population average. PICK A PLAN - Fall asleep faster: for nights when sleep takes ages to come. - Wake up rested: a steadier schedule so mornings stop feeling like a fight. - Switch off in the evening: for evenings when work follows you home. - Remember what you study: swap rereading for quick self-tests spread over days. - Get fitter by walking: brisk walks that grow a little each week, no gym needed. Every plan says who it is for, how many minutes a day it takes and what you will need before you start. Optional extras are labelled Optional, and supplements are never required. HOW A DAY WORKS Today shows what is due now. Tap a task to see exactly what to do. Missed something? It stays on its day instead of piling up. After the first week, a short check-in shows how it went and asks whether to keep going or stop there. Stopping is a fine answer. SEE WHETHER IT MOVED Connect Apple Health or Oura if you want to. By Day compares recent readings against your own baseline, shows how much data is behind the number, and says plainly when a finding is still forming. Health data is optional; the app works without it. WORKS OFFLINE Complete tasks and write notes with no connection. Changes save on the device and sync when you are back. FREE DURING OPEN BETA, AND 200 LIFETIME SPOTS Everyone gets Explorer free while the open beta runs. When it ends, the first 200 people who finished their first 21-day plan with at least 80% of its required tasks done keep Explorer for life. BY DAY EXPLORER Explorer adds the full plan catalogue, advanced trends and connected health controls. Monthly and yearly plans are available. Payment is charged to your Apple Account at confirmation. Subscriptions renew automatically unless cancelled at least 24 hours before the period ends. Manage or cancel in your App Store account settings. By Day is for ages 13 and up. It is not a medical device and does not diagnose, treat, cure or prevent any condition. Talk to a qualified health professional about medical decisions. Terms: https://byday-app.com/terms Privacy: https://byday-app.com/privacy Support: https://byday-app.com/support
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What's New in By Day

1.0.2

September 27, 2026

Fixes for the Sprints tab: the active sprint's cover image and the featured program card now always draw. The account settings screen shows its text correctly again. Live Activity updates no longer fire while the app is in the background.

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Subscriptions & In-App Purchases

Explorer Monthly

Sprints, health trends and detailed stats

$6.991 Month
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