# Systems vs One Habit

The clearest difference is iOS requirement: One Habit at 15.0 against Systems's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Systems sells 4 in-app purchases, starting at $3.99 per 7 days and One Habit sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Systems ships an update every 4 weeks, One Habit monthly. The most recent releases landed on October 3, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Systems | One Habit |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Monthly |
| Size | 70 MB | 51 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | +4 | 4+ |
| Developer | [Adam Kovacs](https://appshunter.io/developer/1814096456) | [Sandra Zanglein](https://appshunter.io/developer/1895452172) |

## What reviewers say

### Systems

[App page](https://appshunter.io/ios/app/systems-checklists/id6746172413)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Systems Pro Weekly | $3.99 | per 7 days |
| Systems Pro (1 Month) | $4.99 | per month |
| Systems Pro (1 Year) | $19.99 | per year |
| Systems Pro (Lifetime) | $49.99 | one-time |


### One Habit

[App page](https://appshunter.io/ios/app/one-habit-remember-why/id6763713166)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Habit Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Systems free?

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

### Is One Habit free?

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

### Do Systems or One Habit have ads?

Neither Systems nor One Habit shows ads.

### Which is updated more often, Systems or One Habit?

Systems ships an update every 4 weeks, and One Habit monthly. Most recently, Systems was updated on October 3, 2026 and One Habit on October 1, 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.*