# Interval Randomizer vs Felt

The clearest difference is in-app purchases: Interval Randomizer at none against Felt's 7. Felt's advantage is update cadence (weekly vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Felt sells 7 in-app purchases, starting at $4.99 per 7 days. Interval Randomizer asks for nothing beyond the download.

Interval Randomizer ships an update monthly, Felt weekly. The most recent releases landed on October 6, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Interval Randomizer | Felt |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Size | 6 MB | 21 MB |
| Requires iOS | 18.2 | **18.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Hitfire Production AB](https://appshunter.io/developer/1517601288) | [Amirmahdi Fathi](https://appshunter.io/developer/1638616778) |

## 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


### Felt

[App page](https://appshunter.io/ios/app/felt-mood-tracker-and-journal/id6765470187)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Felt Pro Weekly | $4.99 | per 7 days |
| Felt Pro Monthly | $9.99 | per month |
| Felt Pro Annual | $19.99 | per year |
| Felt Pro Annual | $39.99 | per year |
| Felt Pro Annual | $39.99 | per year |
| Felt Pro Annual | $39.99 | per year |
| Felt Pro Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is Interval Randomizer free?

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

### Is Felt free?

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

### Do Interval Randomizer or Felt have ads?

Neither Interval Randomizer nor Felt shows ads.

### Which is updated more often, Interval Randomizer or Felt?

Interval Randomizer ships an update monthly, and Felt weekly. Most recently, Interval Randomizer was updated on October 6, 2026 and Felt 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.*