Today, with room to miss once
Check-off, numeric goals, timed sessions, and photo proof — four habit types with colour, icon, and cover photo. Your daily routine stays clear without a streak that collapses on day one.
52%
of people quit a habit app within 30 days.
44%
drop off after breaking a streak.
66–254
days is how long the average habit takes to become automatic.
Streaks punish the day you missed.
We built the app around the day after.
How the 2 Day Rule works
One miss is a pause. Two in a row is how you break bad habits of quitting — and how good habits die. Two Days keeps the chain intact.
01
Show up most days
Log check-offs, numeric goals, timed sessions, or photo proof. Free tier covers five habits with the full engine.
02
Miss once — you’re at risk
Life happens. The habit turns signal orange. No zeroed streak. No shame spiral. Just a clear warning.
03
Come back the next day
Complete it and the chain holds. Comeback rate is the metric that matters — how often you return after a miss.
Built for daily routine, not perfect streaks
A habit app that expects interruptions — and designs the comeback into every screen.
Every habit, one clear chain
Open a habit to see the 2-Day Rule status, history, and what “safe” vs “at risk” means for that chain — so a single miss is a warning, not a wipe.
Insights that favour comebacks
ProActivity heatmap, strongest days of the week, time-of-day patterns, and which habits make your other habits more likely. Built around consistency, not a vanity streak.
Add habits your way
Create check-offs, numeric goals, timed sessions, or photo proof — with colour and schedule that fit your morning routine or evening wind-down.
Two Days on Apple Watch
ProCheck today’s habits and complete sessions from your wrist — the same 2-Day Rule, without unlocking your phone.
Free to start. Pro when you need more.
No account. No ads. Upgrade only if unlimited habits, insights, Watch, and widgets earn their keep.
Free
$0
The full 2-Day Rule engine, no account required.
- Up to 5 habits
- Full 2-Day Rule engine
- One reminder per habit
- Basic home screen widget
- iCloud sync
- Full data export (JSON & CSV)
Pro Monthly
14 days free$4.99/month
Unlimited habits and the full Pro toolkit.
- Unlimited habits
- Adaptive reminders
- Full insights
- Lock screen & interactive widgets
- Apple Watch
- Health verification
- Routine stacks
Pro Annual
Save 42%$34.99/year
Same Pro features, billed yearly.
- Everything in Pro Monthly
- Best value for daily use
- Billed once per year
- Cancel anytime in Apple ID settings
Pro Lifetime
$89.99 once
Pay once. Includes a monthly allowance of AI-assisted insights rather than unlimited.
- Everything in Pro
- One-time purchase
- Monthly AI-assisted insights allowance
Questions
Straight answers about the habit tracker and the 2 Day Rule.
What is the 2 Day Rule?
Skip a day if life gets in the way — but never skip two in a row. One missed day is a pause. Two is how habits die. Two Days marks the habit at risk after one miss and drives the comeback the next day, instead of resetting your streak to zero.
How is this different from other habit trackers?
Most habit apps punish a single miss by wiping your streak. That is why so many people quit after a break. Two Days treats one miss as at risk, not failed. The headline metric is comeback rate — how often you return the next day — not current streak. A streak can be lost. A comeback rate cannot.
Do I need an account?
No. There is no sign-up. Habit data stays on your device and syncs through your private iCloud database. We cannot read it.
What is included for free?
Free includes up to 5 habits, the full 2-Day Rule engine, one reminder per habit, a basic home screen widget, iCloud sync, and full data export in JSON and CSV — always.
What does Pro unlock?
Pro adds unlimited habits, adaptive reminders, full insights, lock screen and interactive widgets, Apple Watch, Health verification, and routine stacks. Start with a free trial on monthly, or choose annual or lifetime.
Does Two Days treat or diagnose ADHD?
No. Two Days is a habit tracker built for consistency. It does not treat, manage, diagnose, or claim clinical validation for ADHD or any medical condition.
Can I export or delete my data?
Yes. Full export to JSON and CSV is available on the free tier. You can delete all local data from within the app; iCloud copies follow Apple’s iCloud deletion behaviour for your account.
Which devices are supported?
iPhone on iOS 18+, with an Apple Watch app for Pro. Lock screen and home screen widgets are included (basic widget on free; lock screen and interactive widgets on Pro).