# Hidden Timer vs Smart Sleep Timer

The clearest difference is ads: Smart Sleep Timer at none against Hidden Timer's shown. Hidden Timer's advantage is update cadence (every 2 weeks vs every 8 months) and iOS requirement (15.8.3 vs 18.2). On price, 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.

Hidden Timer ships an update every 2 weeks, Smart Sleep Timer every 8 months. The most recent releases landed on October 2, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Hidden Timer | Smart Sleep Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/smart-sleep-timer/id6739953694/reviews)** |
| Number of ratings | — | **5** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 8 months |
| Monetization | — | Free |
| Size | 35 MB | 11 MB |
| Requires iOS | **15.8.3** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [BRIDGETECH SOLUTIONS LIMITED](https://appshunter.io/developer/497840921) |

## What reviewers say

### Hidden Timer

[App page](https://appshunter.io/ios/app/hidden-timer/id6502872588)

**Features:** macOS Compatibility

**In-app purchases:** none


### Smart Sleep Timer

[App page](https://appshunter.io/ios/app/smart-sleep-timer/id6739953694)

This app automatically pauses your media playback when you fall asleep or at a set time. It integrates with your favorite audio and video apps to prevent wasted battery and data.

**Highlights:** Snore detection for automatic pausing, Customizable manual timers, Seamless integration with media apps, Battery and data saving, Adjusts to user's sleep patterns

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

**In-app purchases:** none


## Frequently asked questions

### Is Hidden Timer free?

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

### Is Smart Sleep Timer free?

Smart Sleep Timer is free to download, with no in-app purchases.

### Do Hidden Timer or Smart Sleep Timer have ads?

Hidden Timer shows ads; Smart Sleep Timer does not.

### Which is updated more often, Hidden Timer or Smart Sleep Timer?

Hidden Timer ships an update every 2 weeks, and Smart Sleep Timer every 8 months. Most recently, Hidden Timer was updated on October 2, 2026 and Smart Sleep Timer on October 3, 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.*