# CalcFormula vs VoiceTimeSignal

The clearest difference is in-app purchases: VoiceTimeSignal at none against CalcFormula's 1. VoiceTimeSignal also leads on iOS requirement (15.8.3 vs 26.0). CalcFormula's advantage is ads (none vs shown). On price and device support there is nothing between them.

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

## The numbers

| Metric | CalcFormula | VoiceTimeSignal |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | — | Every 2 weeks |
| Size | 16 MB | 35 MB |
| Requires iOS | 26.0 | **15.8.3** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [仲达 夏](https://appshunter.io/developer/1436433399) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### CalcFormula

[App page](https://appshunter.io/ios/app/calcformula/id1436433400)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CalcFormula PRO | $0.99 | one-time |


### VoiceTimeSignal

[App page](https://appshunter.io/ios/app/voicetimesignal/id6503018936)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CalcFormula free?

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

### Is VoiceTimeSignal free?

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

### Do CalcFormula or VoiceTimeSignal have ads?

VoiceTimeSignal shows ads; CalcFormula does not.

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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.*