# Flat Habits vs Keel

The clearest difference is price: Keel at Free against Flat Habits's $5.99. Flat Habits's advantage is update cadence (every 9 days vs every 5 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Keel is free to download; Flat Habits costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Flat Habits ships an update every 9 days, Keel every 5 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Flat Habits | Keel |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[4.9 (58 ratings)](https://appshunter.io/ios/app/flat-habits/id1558358855/reviews)** | — |
| Number of ratings | **58** | — |
| Positive reviews | 87.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 5 months |
| Monetization | Free | — |
| Size | 2 MB | 29 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Xenodium Ltd.](https://appshunter.io/developer/304568690) | [ALASDAIR CUNNINGHAM](https://appshunter.io/developer/1889323128) |

## What reviewers say

### Flat Habits

[App page](https://appshunter.io/ios/app/flat-habits/id1558358855)

Track daily or weekly habits with a focus on privacy and ease of use. Receive timely notifications and quickly log progress directly from alerts. Review your streaks and commitment, with options for offline use and data export.

**Highlights:** Set daily/weekly habits, Due habit notifications, Quick notification actions, Review day streaks, Offline use, Export habit data, Org mode compatible

**Features:** Vision Pro support

**In-app purchases:** none


### Keel

[App page](https://appshunter.io/ios/app/keel-weight-tracker/id6761394184)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flat Habits free?

Flat Habits costs $5.99, with no in-app purchases.

### Is Keel free?

Keel is free to download, with no in-app purchases.

### Do Flat Habits or Keel have ads?

Neither Flat Habits nor Keel shows ads.

### Which is updated more often, Flat Habits or Keel?

Flat Habits ships an update every 9 days, and Keel every 5 months. Most recently, Flat Habits was updated on November 3, 2026 and Keel on October 31, 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.*