# Owlculator vs Quietmarks

The clearest difference is price: Owlculator at Free against Quietmarks's $2.99. Quietmarks's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

Owlculator is free to download; Quietmarks costs $2.99 up front. Owlculator sells 1 one-off in-app purchase. Quietmarks asks for nothing beyond the download.

Owlculator ships an update every 4 days, Quietmarks weekly. The most recent releases landed on September 30, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Owlculator | Quietmarks |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Weekly |
| Size | 2 MB | 3 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Fishington Studios](https://appshunter.io/developer/344044425) | [Robert Corbin](https://appshunter.io/developer/1890247992) |

## What reviewers say

### Owlculator

[App page](https://appshunter.io/ios/app/owlculator-math-notes/id6761601067)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Pro | $4.99 | one-time |


### Quietmarks

[App page](https://appshunter.io/ios/app/quietmarks-noise-diary/id6777257413)

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

**In-app purchases:** none


## Frequently asked questions

### Is Owlculator free?

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

### Is Quietmarks free?

Quietmarks costs $2.99, with no in-app purchases.

### Do Owlculator or Quietmarks have ads?

Neither Owlculator nor Quietmarks shows ads.

### Which is updated more often, Owlculator or Quietmarks?

Owlculator ships an update every 4 days, and Quietmarks weekly. Most recently, Owlculator was updated on September 30, 2026 and Quietmarks on October 8, 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.*