# Constant Scale vs Habit Tracker

The clearest difference is in-app purchases: Constant Scale at none against Habit Tracker's 2. Constant Scale also leads on iOS requirement (11.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Habit Tracker sells 2 in-app purchases, starting at $1.99 per month. Constant Scale asks for nothing beyond the download.

Constant Scale ships an update every 4 weeks, Habit Tracker fortnightly. The most recent releases landed on November 8, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Constant Scale | Habit Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Fortnightly** |
| Size | 150 MB | 13 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yiwu Chaolan Import & Export Co., Ltd.](https://appshunter.io/developer/1788815884) | [Cortexlumora](https://appshunter.io/developer/1895714479) |

## What reviewers say

### Constant Scale

[App page](https://appshunter.io/ios/app/constant-scale/id6740186656)

**Features:** macOS Compatibility

**In-app purchases:** none


### Habit Tracker

[App page](https://appshunter.io/ios/app/habit-tracker-habitflow/id6766019130)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HabitFlow Pro | $1.99 | per month |
| HabitFlow Pro | $9.99 | per year |


## Frequently asked questions

### Is Constant Scale free?

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

### Is Habit Tracker free?

Habit Tracker is free to download, with in-app purchases available.

### Do Constant Scale or Habit Tracker have ads?

Neither Constant Scale nor Habit Tracker shows ads.

### Which is updated more often, Constant Scale or Habit Tracker?

Constant Scale ships an update every 4 weeks, and Habit Tracker fortnightly. Most recently, Constant Scale was updated on November 8, 2026 and Habit Tracker 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.*