# Master Flash® Calculator vs Relax Before Sleep

The clearest difference is update cadence: Master Flash® Calculator at weekly against Relax Before Sleep's every 10 months. Master Flash® Calculator also leads on iOS requirement (12.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Master Flash® Calculator ships an update weekly, Relax Before Sleep every 10 months. The most recent releases landed on September 20, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | Master Flash® Calculator | Relax Before Sleep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 10 months |
| Size | 33 MB | 55 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Aztec International S.A.](https://appshunter.io/developer/1726986799) | [Hangzhou Plastic Engine Technology Co., Ltd](https://appshunter.io/developer/1761472358) |

## What reviewers say

### Master Flash® Calculator

[App page](https://appshunter.io/ios/app/master-flash-calculator/id6476518905)

**Features:** macOS Compatibility

**In-app purchases:** none


### Relax Before Sleep

[App page](https://appshunter.io/ios/app/relax-before-sleep/id6755080401)

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

**In-app purchases:** none


## Frequently asked questions

### Is Master Flash® Calculator free?

Master Flash® Calculator is free to download, with no in-app purchases.

### Is Relax Before Sleep free?

Relax Before Sleep is free to download, with no in-app purchases.

### Do Master Flash® Calculator or Relax Before Sleep have ads?

Neither Master Flash® Calculator nor Relax Before Sleep shows ads.

### Which is updated more often, Master Flash® Calculator or Relax Before Sleep?

Master Flash® Calculator ships an update weekly, and Relax Before Sleep every 10 months. Most recently, Master Flash® Calculator was updated on September 20, 2026 and Relax Before Sleep on September 6, 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.*