Comparison

Interval Voice Clock vs RenjiCalc

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Customizable announcement intervals
  • Adjustable announcement volume
  • Choice of male or female voice
  • Background playback support
  • Offline functionality
  • Multiple announcement types
Features
Read full description

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)

About

RenjiCalc

Read full description

“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

Interval Voice Clock2 screens
RenjiCalc4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

Interval Voice Clock ships an update every 2 weeks, RenjiCalc fortnightly. Both last shipped on October 25, 2026.

Scorecard4 real differences · 6 level
Interval Voice Clock versus RenjiCalc: the parameters behind the verdict, then further details
ParameterInterval Voice ClockRenjiCalc
Price$1.99Free — better
Rating4.0 (2 ratings) — better—
Positive reviews62.5% of reviews—
Number of ratings2 — better—
Update frequencyEvery 2 weeks — betterFortnightly
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod, Mac — betteriPhone
Requires iOS15.0 — better18.0
Further details — not scored
Size32 MB11 MB
Age rating4+4+
DeveloperRyo Okamotoken hasegawa

In-app purchases

None

Interval Voice Clock

No in-app purchases

None

RenjiCalc

No in-app purchases

Questions

Is Interval Voice Clock free?
Interval Voice Clock costs $1.99, with no in-app purchases.
Is RenjiCalc free?
RenjiCalc is free to download, with no in-app purchases.
Do Interval Voice Clock or RenjiCalc have ads?
RenjiCalc shows ads; Interval Voice Clock does not.
Which is updated more often, Interval Voice Clock or RenjiCalc?
Interval Voice Clock ships an update every 2 weeks, and RenjiCalc fortnightly. Most recently, Interval Voice Clock was updated on October 25, 2026 and RenjiCalc on October 25, 2026.

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