# Interval Voice Clock vs PencilCalc

The clearest difference is price: PencilCalc at Free against Interval Voice Clock's $1.99. PencilCalc also leads on update cadence (every 2 days vs every 2 weeks). Interval Voice Clock's advantage is device support (4 vs 2) and iOS requirement (15.0 vs 18.6). On ads and in-app purchases there is nothing between them.

PencilCalc is free to download; Interval Voice Clock costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Interval Voice Clock ships an update every 2 weeks, PencilCalc every 2 days. The most recent releases landed on October 25, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Interval Voice Clock | PencilCalc |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/interval-voice-clock/id6476801545/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | Paid | — |
| Size | 32 MB | 4 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ryo Okamoto](https://appshunter.io/developer/418850607) | [YASUHIDE MATSUMOTO](https://appshunter.io/developer/1850732929) |

## What reviewers say

### Interval Voice Clock

[App page](https://appshunter.io/ios/app/interval-voice-clock/id6476801545)

This app announces the current time at customizable intervals, allowing for hands-free time checks. It offers adjustable volume, voice options, and background playback, functioning entirely offline.

**Highlights:** Customizable announcement intervals, Adjustable announcement volume, Choice of male or female voice, Background playback support, Offline functionality, Multiple announcement types

**Features:** Vision Pro support

**In-app purchases:** none


### PencilCalc

[App page](https://appshunter.io/ios/app/pencilcalc/id6754930533)

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

**In-app purchases:** none


## Frequently asked questions

### Is Interval Voice Clock free?

Interval Voice Clock costs $1.99, with no in-app purchases.

### Is PencilCalc free?

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

### Do Interval Voice Clock or PencilCalc have ads?

Neither Interval Voice Clock nor PencilCalc shows ads.

### Which is updated more often, Interval Voice Clock or PencilCalc?

Interval Voice Clock ships an update every 2 weeks, and PencilCalc every 2 days. Most recently, Interval Voice Clock was updated on October 25, 2026 and PencilCalc on October 14, 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.*