Comparison

66 Days vs enough.

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

66 Days

This app helps you build lasting habits by encouraging daily repetition over a 66-day period. Set project-specific goals and track your progress with features like memos, photos, and notifications.

Highlights
  • 66-day habit building system
  • Project-based goal setting
  • Daily progress tracking
  • Memo and photo recording
  • Dark mode support
  • Push notifications
Features
Read full description

According to a landmark study by University College London (UCL), it takes an average of 66 days for a new behavior to become an automatic, lifelong habit. You don't need extreme willpower or superhuman effort. By repeating small, consistent actions every day, your brain naturally transforms them into effortless routines. 66 Days is designed to help you organize your life goals into actionable projects, maintain daily streaks, and conquer the 66-day milestone to transform your lifestyle. [ 66 Days Key Features ] 1. Project-Based Habit Building • Set meaningful goals like 'Lose 10 kg' or 'Read 20 Books' and attach daily micro-actions (e.g., 30 push-ups, read 15 mins). • Completing just one habit action per day keeps your streak alive! 2. Break Bad Habits & Quit Tracker • Track your clean streaks for quitting smoking, junk food, procrastination, or screen time. • Log reflections when overcoming cravings and watch your milestone gauges grow. 3. Insightful Analytics & Milestones • Visualize your consistency with heatmap calendars, weekly trends, and overall statistics. • Reach 66 days to enshrine your achievement in the permanent 'Success Collection' and unlock badges. 4. Personalized Cards & iOS Widgets • Customize each habit card with custom photos, elegant color palettes, and blur themes. • Stay on top of your daily routines directly from your Home Screen with beautiful widgets. 5. Privacy & Biometric Lock • Keep your personal habit journal safe with Face ID and Touch ID biometric locking. 6. Lifetime Access & Premium • Unlock all premium features permanently with a single one-time purchase—no subscription stress. Start today. In 66 days, you will meet a completely new version of yourself! Terms of Use (EULA): https://66days.epipherse.com/terms/ Privacy Policy: https://66days.epipherse.com/privacy/

About

enough.

Features
Read full description

Your to-do list keeps growing. The energy you have in a day does not. enough plans your day by energy instead of hours. Rather than slicing the day into 30-minute blocks, you decide how much you can carry today, then plan only within that. ■ Plan with an Energy Budget Set today's Energy Budget when you start — Light, Steady, or Full, whatever matches how you actually feel. Give each Action an energy value and watch what's left. Once the budget is spent, nothing more fits, so overcommitting gets harder. ■ Backlog and Focus Dump everything into Backlog. Sorting it out can wait. Move only today's work into Focus, and that's your list. When the day goes sideways, plan again. ■ Wrap the day Finish every Action in Focus and you can close the day. Things left in Backlog are fine. Some days, what you did is enough. ■ A reset time that fits you Your budget resets at the hour you choose, because a day that ends at 2am isn't the same as one that ends at 10pm. While travelling, the reset follows your device's local time. ■ Also included · Save frequent Actions as shortcuts · Due dates and times · Sort by date created, energy, or due date · Multi-select to move items in one go · Log how it felt — easier, about right, or harder · See your weekly energy trend · Sign in with Apple to sync across devices · Start straight away without an account · Works offline · English and Korean Do less. Finish more.

Screenshots

66 Days4 screens
enough.4 screens

Verdict

The call

The clearest difference is in-app purchases: enough. at none against 66 Days's 5. enough. also leads on update cadence (daily vs every 3 weeks) and iOS requirement (16.4 vs 18.0). 66 Days's advantage is device support (3 vs 1). On price and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. 66 Days sells 5 in-app purchases, starting at $1.99 per month. enough. asks for nothing beyond the download.

UpkeepUpdate frequency

66 Days ships an update every 3 weeks, enough. daily. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

Scorecard4 real differences · 6 level
66 Days versus enough.: the parameters behind the verdict, then further details
Parameter66 Daysenough.
PriceFreeFree
Rating4.1 (9 ratings) — better—
Positive reviews72.9% of reviews—
Number of ratings9 — better—
Update frequencyEvery 3 weeksDaily — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, Apple Watch — betteriPhone
Requires iOS18.016.4 — better
Further details — not scored
Size19 MB49 MB
Age rating4+4+
DeveloperEpipherseHyeryung Choi

In-app purchases

5 purchases

66 Days

Subscriptions3
  • Premium 1 Month$1.991 Month
  • Premium 3 Month$4.993 Months
  • Premium 1 Year$9.991 Year
One-time2
  • Project Streak Recovery$2.99
  • Premium Lifetime$22.99
None

enough.

No in-app purchases

Questions

Is 66 Days free?
66 Days is free to download, with in-app purchases available.
Is enough. free?
enough. is free to download, with no in-app purchases.
Do 66 Days or enough. have ads?
Neither 66 Days nor enough. shows ads.
Which is updated more often, 66 Days or enough.?
66 Days ships an update every 3 weeks, and enough. daily. Most recently, 66 Days was updated on November 2, 2026 and enough. on October 31, 2026.

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