# SBD vs Sleep Window

The clearest difference is in-app purchases: SBD at none against Sleep Window's 4. SBD also leads on update cadence (every 2 days vs every 10 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Sleep Window sells 4 in-app purchases, starting at $2.99 per month. SBD asks for nothing beyond the download.

SBD ships an update every 2 days, Sleep Window every 10 days. The most recent releases landed on October 28, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | SBD | Sleep Window |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sbd-big3/id6759197117/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 10 days |
| Monetization | **Free** | Free with in-app purchases |
| Size | 6 MB | 10 MB |
| Requires iOS | **16.0** | 16.1 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Fuchigami Sohta](https://appshunter.io/developer/1871797640) | [SAELI, LIMITED LIABILITY COMPANY](https://appshunter.io/developer/1450627776) |

## What reviewers say

### SBD

[App page](https://appshunter.io/ios/app/sbd-big3/id6759197117)

This app focuses on tracking your progress for the three main powerlifting exercises: squat, bench press, and deadlift. It automatically calculates estimated 1RM, hypertrophy range, and volume, and logs personal bests. You can also record daily conditions, trained muscles, and notes for supplementary workouts.

**Highlights:** Track squat, bench press, and deadlift, Automatic estimated 1RM calculation, Automatic personal best logging, Record daily condition and notes, View progress with calendar and graphs, Focus on BIG3 exercises

**Features:** macOS Compatibility

**In-app purchases:** none


### Sleep Window

[App page](https://appshunter.io/ios/app/sleep-window/id6759549503)

This app transforms your sleep into a currency that funds urban development. As you sleep, your "Sleep Yen" accumulates and is used to build and upgrade a city that evolves from gray concrete to a vibrant, glowing metropolis. Watch your city grow each morning through your window.

**Highlights:** Sleep converted to city development funds, AI-generated city evolution in 7 stages, Customizable city themes (Japanese, Cyberpunk), Morning window view of your city, Save completed cities to collection

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 特権階級 | $2.99 | per month |
| ベーシックプラン | $2.99 | per month |
| プレミアム | $5.99 | per month |
| 特別恩赦令（記録復元） | $0.99 | one-time |


## Frequently asked questions

### Is SBD free?

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

### Is Sleep Window free?

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

### Do SBD or Sleep Window have ads?

Neither SBD nor Sleep Window shows ads.

### Which is updated more often, SBD or Sleep Window?

SBD ships an update every 2 days, and Sleep Window every 10 days. Most recently, SBD was updated on October 28, 2026 and Sleep Window on October 7, 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.*