Time Calculation 1.0.1

Kei Suefuji ❘ Commercial ❘
iOS

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Simple time add/subtract app but limited (Time Calculation by Kei Suefuji)

Pete Milner

06/15/2026

A lightweight utility for adding and subtracting hours and minutes with copyable results and a 10-entry history, but reported to require 24-hour input (no AM/PM support) and has mixed user feedback and minimal features.

Time Calculation is an application designed to simplify the addition and subtraction of time values. It enables users to compute hours and minutes without performing manual rounding every 60 minutes. The results can be copied, and users can review both the calculated results and the formula history.

Please input hours and minutes in the format "hour:minute".

Arrow button — Moves the cursor position within the calculation formula. Use it when editing or modifying the formula.
DEL button — Deletes the character at the cursor in the calculation formula. If the cursor is at the end, it deletes the preceding character.
AC button — Clears all entered calculation formulas and the calculation result.
Copy button — After a calculation is completed, a square "Copy" button appears to the left of the result. Tapping it copies the calculation result so it can be pasted into other applications.
Clock button — Opens the history, showing up to 10 entries of past results and formulas. When the history exceeds 10 items, the oldest entries are removed. Each history item can be deleted by tapping the adjacent "Trash can" button.

Overview

Time Calculation is a Commercial software in the category System Utilities developed by Kei Suefuji.

The latest version of Time Calculation is 1.0.1, released on 06/14/2026. It was initially added to our database on 06/14/2026.

Time Calculation runs on the following operating systems: iOS.

Users of Time Calculation gave it a rating of 2 out of 5 stars.

Pros

Simple, focused functionality — quick add/subtract of hours:minutes without manual minute rounding.
Very small app size (≈499 KB), minimal storage footprint and fast to download.
Supports copy of results and a clear history view (up to 10 recent calculations) for easy reuse.
Basic editing controls (arrow cursor movement, DEL, AC) make formula entry and correction straightforward.
Multi-platform availability per App Store (iPhone, iPad, iPadOS, macOS on M1+, Apple Vision) increases flexibility.
Supports multiple languages (English plus 8 other languages).
Low one-time purchase price ($1.99) — no apparent in‑app subscriptions.
Developer states the app does not collect user data (privacy claim shown on App Store).
Developer appears reachable (Akikibai-Laboratory site and Contact/Privacy pages linked from listing).
Actively maintained — release notes show updates (including an iOS 18 compatibility update).

Cons

Reported incorrect behavior for 12‑hour (AM/PM) input — user review indicates the app effectively requires 24‑hour (military) time and lacks an AM/PM setting, which can produce wrong results for typical 12‑hour users.
Very low App Store rating (2.0) with few reviews — limited social proof and user feedback to judge reliability.
History is limited to the last 10 calculations and entries are auto‑pruned, which may be insufficient for some workflows.
Feature set is very basic — no advanced scheduling, durations across dates, time zone handling, or recurring/time‑span features.
Small binary likely reflects limited functionality and minimal UI polish or extra utilities.
Documentation inside the app appears minimal — users must rely on the brief App Store description or developer site for instructions.
Privacy claim (“Data Not Collected”) is provided by the developer and has not been independently verified by Apple.
No explicit AM/PM toggle or guidance increases chance of user entry errors for common 12‑hour time formats.
Only one visible user review reporting a critical correctness issue — suggests potential edge‑case bugs not widely reported but impactful.
No evident accessibility details beyond basic App Store Accessibility section; feature set may be less friendly to users needing assistive tech.

Pete Milner

I'm Pete, a software reviewer at UpdateStar with a passion for the ever-evolving world of technology. My background in engineering gives me a unique insight into the intricacies of software, allowing me to provide in-depth, knowledgeable reviews and analyses. Whether it's the newest software releases, tech innovations, or the latest trends, I'm here to break it all down for you. I work from UpdateStar’s Berlin main office.

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