# Owlculator vs SignalProof

The clearest difference is in-app purchases: SignalProof at none against Owlculator's 1. Owlculator's advantage is update cadence (every 4 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Owlculator sells 1 one-off in-app purchase. SignalProof asks for nothing beyond the download.

Owlculator ships an update every 4 days, SignalProof every 3 weeks. The most recent releases landed on July 8, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Owlculator | SignalProof |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Size | 2 MB | 7 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Fishington Studios](https://appshunter.io/developer/344044425) | [Borealbit Technology Limited](https://appshunter.io/developer/1808424081) |

## 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 |


### SignalProof

[App page](https://appshunter.io/ios/app/signalproof-tone-generator/id6785174973)

**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 SignalProof free?

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

### Do Owlculator or SignalProof have ads?

Neither Owlculator nor SignalProof shows ads.

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

Owlculator ships an update every 4 days, and SignalProof every 3 weeks. Most recently, Owlculator was updated on July 8, 2026 and SignalProof on September 11, 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.*