# Set One vs Mayim

The clearest difference is in-app purchases: Set One at none against Mayim's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Mayim sells 1 one-off in-app purchase. Set One asks for nothing beyond the download.

Set One ships an update every 4 days, Mayim every 5 days. The most recent releases landed on October 9, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Set One | Mayim |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 5 days |
| Size | 35 MB | 55 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [JAEYEOP KIM](https://appshunter.io/developer/1787511263) | [Ben Basha](https://appshunter.io/developer/1869851400) |

## What reviewers say

### Set One

[App page](https://appshunter.io/ios/app/set-one/id6753909776)

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

**In-app purchases:** none


### Mayim

[App page](https://appshunter.io/ios/app/mayim-water-tracker-and-widget/id6796484355)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mayim Premium | $6.99 | one-time |


## Frequently asked questions

### Is Set One free?

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

### Is Mayim free?

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

### Do Set One or Mayim have ads?

Neither Set One nor Mayim shows ads.

### Which is updated more often, Set One or Mayim?

Set One ships an update every 4 days, and Mayim every 5 days. Most recently, Set One was updated on October 9, 2026 and Mayim on October 25, 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.*