# Interval Randomizer vs Pass Alarm

The clearest difference is in-app purchases: Interval Randomizer at none against Pass Alarm's 2. Interval Randomizer also leads on ads (none vs shown). Pass Alarm's advantage is update cadence (daily vs monthly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Pass Alarm sells 2 in-app purchases, starting at $2.99 per month. Interval Randomizer asks for nothing beyond the download.

Interval Randomizer ships an update monthly, Pass Alarm daily. The most recent releases landed on October 6, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Interval Randomizer | Pass Alarm |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Daily** |
| Size | 6 MB | 19 MB |
| Requires iOS | 18.2 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hitfire Production AB](https://appshunter.io/developer/1517601288) | [no geass inc.](https://appshunter.io/developer/1879395534) |

## What reviewers say

### Interval Randomizer

[App page](https://appshunter.io/ios/app/interval-randomizer-hiit/id6742220783)

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

**In-app purchases:** none


### Pass Alarm

[App page](https://appshunter.io/ios/app/pass-alarm/id6759545599)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| パスアラーム Pro(月額) | $2.99 | per month |
| パスアラーム Pro(年額) | $22.99 | per year |


## Frequently asked questions

### Is Interval Randomizer free?

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

### Is Pass Alarm free?

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

### Do Interval Randomizer or Pass Alarm have ads?

Pass Alarm shows ads; Interval Randomizer does not.

### Which is updated more often, Interval Randomizer or Pass Alarm?

Interval Randomizer ships an update monthly, and Pass Alarm daily. Most recently, Interval Randomizer was updated on October 6, 2026 and Pass Alarm 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.*