Interval Voice Clock vs PencilCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Interval Voice Clock
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.
- Customizable announcement intervals
- Adjustable announcement volume
- Choice of male or female voice
- Background playback support
- Offline functionality
- Multiple announcement types
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Signal Time is a simple and easy-to-read app that announces the time at regular intervals. By default, it announces the time every 10 seconds (customizable). Use it in various situations—have it read the time aloud while you're busy getting ready in the morning, or check the time hands-free in the kitchen while waiting for your favorite show to start. No internet connection is required; the app works entirely offline. * Adjust the volume of both the second-hand sound and voice announcements (can be muted) * Set the announcement interval (from every 10 seconds to every hour) * Choose the type of voice used for announcements (female or male) * Supports background playback * Choose the type of announcements (Standard, Simple and Minimal)
PencilCalc
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PencilCalc PencilCalc displays calculation results in the vertical arithmetic format taught in Japanese elementary schools. Even when used like a regular calculator, the answers appear neatly in the traditional pencil-and-paper style, helping children intuitively understand how addition and subtraction work. It’s perfect for classrooms, home study, or even as brain training for seniors. You can also enjoy ad-free use for 48 hours by watching a short ad — making it safe and comfortable for anyone to use. Main Features • Displays addition and subtraction in vertical (column) format • Supports numbers up to 999,999 • non-personalized ads only
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Interval Voice Clock | PencilCalc |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.0 (2 ratings) — better | — |
| Positive reviews | 62.5% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 2 weeks | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 32 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Ryo Okamoto | YASUHIDE MATSUMOTO |
In-app purchases
Interval Voice Clock
No in-app purchases
PencilCalc
No in-app purchases
Questions
Is Interval Voice Clock free?
Is PencilCalc free?
Do Interval Voice Clock or PencilCalc have ads?
Which is updated more often, Interval Voice Clock or PencilCalc?
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