Time Calculator vs Unit Keeper
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Time Calculator
This comprehensive toolkit helps manage time, dates, and schedules with various calculators. Track work hours, plan shifts, convert time formats, and calculate differences between dates. Ideal for professionals, freelancers, and everyday users needing precise time management.
- Work time tracking
- Shift scheduling
- Date difference calculation
- Countdown timers
- Time zone comparison
- Age calculation
- Time conversion
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Time Calculator is the ultimate all-in-one toolkit for managing time, dates, schedules, and more. Whether you’re tracking work hours, planning shifts, or converting time formats, this app has a calculator for every time-related need. Designed for professionals, freelancers, travellers, and everyday users alike. Included calculators: - Time Calculator Add or subtract hours, minutes, seconds, and days. Optionally apply an hourly rate for cost calculations. - Work Time Calculator Track working hours, salaries, and multiple jobs. Supports custom shifts and detailed breakdowns. - Shift Calculator Create and calculate rotating shift schedules with ease. - Date Calculator Find the difference between two dates in days, weeks, months, and years. - Time Difference Calculate the time between two clock times. - Countdown Set up countdown timers for upcoming events or deadlines. - Weekday Calculator Calculate how many weekdays and weekends are between two dates. - Add to Date Calculator Add days, weeks, months, or years to a starting date to see the resulting date. - Count Days Tap days on a calendar to count them - perfect for tracking Schengen or visa limits. - Days To/From Save countdown timers for any event and see how many days remain. - Add to Time Calculator Add hours and minutes to a specific time of day. - Age Calculator Add birthdays of friends and family to track their exact age. - Time Converter Convert between seconds, minutes, hours, and days. - Time Zone Calculator Add multiple time zones and compare times across regions. - Military Time Calculator Easily convert between 12-hour and 24-hour (military) formats. - Time to Decimal Convert standard time (like 2h 30m) to decimal format and back. --------------------------- Subscription terms: - The subscription auto-renews at the end of each term. - Payment will be charged to iTunes Account at confirmation of purchase. - The subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period. - You may manage your subscription and turn off auto-renewal by going to your Account Settings after purchase. Privacy policy and Terms of Use: https://oval.fi/privacy-policy-time-calculator
Unit Keeper
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Unit Keeper provides the ability to convert complex Units in multiple dimensions into their equivalent values and then allow you to store them as notes. Entering new units is accomplished by typing the unit after the value, such as: 11.999 kg/m².°C = 4.42366364161622 lb/ft².°F L⁻².M.Θ⁻¹ Or perhaps you need to convert something crazy: 23 kJ.MHz.Pa/oz = 57260.3216826005 cal.fps.inHg/g L.M.T⁻⁵ Unit Keeper will also check if your dimensions are consistent as well as showing you the SI Unit equivalents. • Do you need to keep track of a set of conversions? Unit Keeper will allow you to collect all your important conversions you wish to keep in separate files or as read only notes. • Want to keep notes of specific conversions? Conversions will allow you to do this as well organised in separate files if you so desire. • But how do you enter such complex units? This is where Unit Keeper helps, there are two ways to enter such units: 1. You can hit the ‘Units’ button on the right where it will bring up a popup window showing you all the Units you can simply select to form a complex unit set. 2. You can also type your units directly into the number text fields. Typing 14 kg.m3.min-2 will transform into 14 kg/m³.min²; 10 MHz2.in3/min2 will transform into 10 MHz² .in³/min² You can share your conversions and notes to other people as all your work is held in handy files.
Screenshots
Verdict
The clearest difference is in-app purchases: Unit Keeper at none against Time Calculator's 6. Time Calculator's advantage is update cadence (every 2 weeks vs every 6 months) and device support (4 vs 2). On price and ads 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
Both are free to download. Time Calculator sells 6 in-app purchases, starting at $2.99 per month. Unit Keeper asks for nothing beyond the download.
Time Calculator ships an update every 2 weeks, Unit Keeper every 6 months. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.
| Parameter | Time Calculator | Unit Keeper |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (2.9K ratings) — better | — |
| Positive reviews | 78.7% of reviews | — |
| Number of ratings | 2.9K — better | — |
| Update frequency | Every 2 weeks — better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 17 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Oval Software Oy | Eleanor Spenceley |
Bugs and requests
Time Calculator
Reported bugs
5 issues- Unable to upgrade
- Calculator does not show hours, minutes and seconds. Only hour and minutes
- Seconds don't work on a TIME calculator!
- The last update is bad, it doesn't work!
- The settings doesn't work after the last update
Requested features
12 requests- Overtime calculator
- Decimals for time calculator
- Ability to delete entries
- Ability to edit or pick the days on the calendar
- Ability to have the work time calculator on Mac
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- Ability to calculate overtime including rate
- Ability to convert time to AM/PM
- Ability to display hours, minutes and seconds
- Ability to divide the number of hours by days of the month
- Ability to add multiple work shifts in a day
- Ability to keep record of hours and weekly hours worked
- Ability to add different pay rates for different types of work
Unit Keeper
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Time Calculator
- Time Calculator Pro Monthly3 Days trial$2.991 Month
- Time Calculator Premium Monthl3 Days trial$3.991 Month
- Time Calculator Premium3 Days trial$14.991 Year
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- Time Calculator Premium3 Days trial$19.991 Year
- Time Calculator Premium$19.99
- Unlock all features$29.99
Unit Keeper
No in-app purchases







