66 Days vs Map+Line
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 66-day habit building system
- Project-based goal setting
- Daily progress tracking
- Memo and photo recording
- Dark mode support
- Push notifications
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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/
Map+Line
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Map를 활용한 1. 도형 및 선 그리기 2. 다양한 좌표 표시(경위도, mgs, 국가지점번호) 3. 방위각 및 고도 표시 4. 좌표 및 지명을 이용한 경로 안내 5. 좌표 및 지명 검색을 통한 위치 확인
Screenshots
Verdict
The clearest difference is in-app purchases: Map+Line at none against 66 Days's 5. Map+Line also leads on update cadence (every 6 days vs every 3 weeks). 66 Days's advantage is device support (3 vs 1). On price, ads and iOS requirement 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
Both are free to download. 66 Days sells 5 in-app purchases, starting at $1.99 per month. Map+Line asks for nothing beyond the download.
66 Days ships an update every 3 weeks, Map+Line every 6 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.
| Parameter | 66 Days | Map+Line |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (9 ratings) — better | — |
| Positive reviews | 72.9% of reviews | — |
| Number of ratings | 9 — better | — |
| Update frequency | Every 3 weeks | Every 6 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone |
| Requires iOS | 18.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 19 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Epipherse | Hean Woo Ko |
In-app purchases
66 Days
- Premium 1 Month$1.991 Month
- Premium 3 Month$4.993 Months
- Premium 1 Year$9.991 Year
- Project Streak Recovery$2.99
- Premium Lifetime$22.99
Map+Line
No in-app purchases
