Interval Voice Clock vs RenjiCalc
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)
RenjiCalc
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“500W for 6 minutes… so how long in my 800W microwave?” Solve that confusion instantly. From conversion to timer start, everything is smooth and effortless. Make your microwave more useful and easier to use. 【Features】 ・Easy wattage conversion: Enter the original wattage and heating time, and it instantly calculates the right time for your microwave. ・One-tap timer from history: Select frequently used items from history and start the timer without recalculating. ・Lock screen progress: Supports the latest iOS Live Activities, so you can check remaining time at a glance on the Lock Screen or Dynamic Island, even when your iPhone is locked. ・Multiple microwave presets: Save and switch between different microwaves, such as one at home and one at work. 【Recommended for】 ・People who often eat frozen foods or convenience store meals ・People who use high-power microwaves (700W/800W and above) ・Anyone who has ever overheated food by guessing the heating time
Screenshots
Verdict
The clearest difference is price: RenjiCalc at Free against Interval Voice Clock's $1.99. Interval Voice Clock's advantage is ads (none vs shown) and device support (4 vs 1). On update cadence 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
RenjiCalc 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, RenjiCalc fortnightly. Both last shipped on October 25, 2026.
| Parameter | Interval Voice Clock | RenjiCalc |
|---|---|---|
| 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 — better | Fortnightly |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 32 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Ryo Okamoto | ken hasegawa |
In-app purchases
Interval Voice Clock
No in-app purchases
RenjiCalc
No in-app purchases
Questions
Is Interval Voice Clock free?
Is RenjiCalc free?
Do Interval Voice Clock or RenjiCalc have ads?
Which is updated more often, Interval Voice Clock or RenjiCalc?
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