# 66 Days vs Map+Line

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.

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 November 9, 2026 respectively.

## The numbers

| Metric | 66 Days | Map+Line |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (9 ratings)](https://appshunter.io/ios/app/66-days-habit-tracker/id1439590647/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 72.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | Freemium | — |
| Size | 19 MB | 2 MB |
| Requires iOS | 18.0 | **17.6** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Epipherse](https://appshunter.io/developer/1231938524) | [Hean Woo Ko](https://appshunter.io/developer/1801701349) |

## What reviewers say

### 66 Days

[App page](https://appshunter.io/ios/app/66-days-habit-tracker/id1439590647)

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:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium 1 Month | $1.99 | per month |
| Premium 3 Month | $4.99 | per 3 months |
| Premium 1 Year | $9.99 | per year |
| Project Streak Recovery | $2.99 | one-time |
| Premium Lifetime | $22.99 | one-time |


### Map+Line

[App page](https://appshunter.io/ios/app/map-plus-line/id6757662322)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 66 Days free?

66 Days is free to download, with in-app purchases available.

### Is Map+Line free?

Map+Line is free to download, with no in-app purchases.

### Do 66 Days or Map+Line have ads?

Neither 66 Days nor Map+Line shows ads.

### Which is updated more often, 66 Days or Map+Line?

66 Days ships an update every 3 weeks, and Map+Line every 6 days. Most recently, 66 Days was updated on November 2, 2026 and Map+Line on November 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*