Time vs OneCalc Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Time
Easily add and subtract hours and minutes without complex conversions. View calculations in real-time and save them for later. Convert time to decimal format and perform advanced operations with the premium version.
- Add and subtract hours and minutes
- Real-time calculation display
- Save calculations
- Convert hours to decimal
- Divide and multiply time (premium)
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Our calculator is designed to help you add and subtract hours and minutes rapidly and without going into complicated conversions. Handy and user friendly, you will be able to see your calculations as you write them down and thus not loosing the thread during long additions. The App keeps all your calculations in memory after closing it. You can calculate up to hundreds of thousands of hours. You can easily convert hours in decimal for instance 2h30 = 2,5 With our Premium version you will also be able to divide and multiply your hours and minutes. The Premium version doesn’t have any adds.
OneCalc Pro
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One calm, capable calculator that replaces a dozen apps cluttering your Home Screen. OneCalc brings together everyday maths, scientific functions, currency and unit conversion, and a genuinely useful pay tracker — all in one beautifully simple app, with no ads, no accounts, and no data leaving your device. Standard and scientific calculator Switch instantly between a clean everyday calculator and full scientific functions, with a scrollable history so you never lose a previous sum. Pay and overtime tracker Built for shift workers. Add jobs and pay rates, set night and weekend multipliers, and watch your earnings update live as you work. No spreadsheets, no guesswork. Scan and Solve Point your camera at a maths problem — textbook, worksheet, whiteboard — and get a clear, step-by-step AI-powered solution in seconds. Live currency, unit and time conversion Convert between 30+ currencies using official ECB rates, with full offline support. Unit, time and percentage converters are built right in for travel, cooking, work or study. Discounts and loans, sorted Work out sale prices and savings instantly, or calculate loan repayments before you commit. Practical tools, no faff. Make it yours Choose from 9 accent themes to match your style, use the Apple Watch app for calculations on the go, and add the interactive widget to your Home Screen for instant access. OneCalc is free to download and use for standard and scientific calculations. Premium unlocks the pay tracker, Scan & Solve, currency conversion, loan and discount calculators, and all themes, with a 3-day free trial. Premium is available as a £9.99 per year subscription or a £29.99 one-time lifetime purchase — your choice, no pressure. One app instead of many. No ads. No accounts. Your data stays on your device. Download OneCalc and see how calm a calculator can feel. https://annmarstudio.co.uk/onecalc/terms https://annmarstudio.co.uk/onecalc/privacy
Screenshots
Verdict
The clearest difference is ads: OneCalc Pro at none against Time's shown. OneCalc Pro also leads on update cadence (every 2 weeks vs every 2 months). Time's advantage is iOS requirement (15.6 vs 18.0). On price, in-app purchases and device support 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 sells 6 one-off in-app purchases and OneCalc Pro sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.
Time ships an update every 2 months, OneCalc Pro every 2 weeks. The most recent releases landed on October 29, 2026 and October 31, 2026 respectively.
| Parameter | Time | OneCalc Pro |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (362 ratings) — better | — |
| Positive reviews | 74.0% of reviews | — |
| Number of ratings | 362 — better | — |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, Mac, Apple Watch |
| Requires iOS | 15.6 — better | 18.0 |
| Further details — not scored | ||
| Size | 8 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Adrien Brecheteau | ANNMAR limited |
Bugs and requests
Time
Reported bugs
5 issues- App closes after 30 seconds of use
- Background music stops when app is active
- App doesn't rotate with screen orientation
- Inconsistent UI rendering
- Cannot handle subtraction of larger time values
Requested features
7 requests- Hours, minutes, and seconds display format
- Dedicated hours tab for easier input
- Multiply and divide time functions
- Decimal point support for calculations
- Screen rotation support for iPad
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- Switch between hours and minutes output units
- Minutes input above 99
OneCalc Pro
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Time
- Delete Ads$1.99
- Tip 1$3.99
- Tip 2$8.99
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- Tip 3$26.99
- Tip 4$45.99
- Tip 5$89.99
OneCalc Pro
- OneCalc Premium Annual$9.991 Year
- OneCalc Unlock Everything$29.99
