Time Calculator + − × ÷ vs OTB Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Time Calculator + − × ÷
Easily perform mathematical operations with hours and dates. This utility helps you quickly get accurate results for time-based calculations.
- Hour and date calculations
- Mathematical operations
- Quick results
- Assists with time-based math
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Do you know that moment when you need to do mathematical operations with hours and dates and it is a little difficult to know the result quickly? The idea of this app is to assist in these calculations.
OTB Clock
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OTB Clock is a precise chess clock for over-the-board games. Supports all standard time controls from bullet to classical. Features: - Bullet, Blitz, Rapid, and Classical presets - Fischer increment support - Move counter - Tap-to-switch interface - Screen stays on during games - Custom time control creation Premium unlocks all time control presets and custom time controls. Free users get 3-minute, 5-minute, and 10-minute presets. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://frexx.top/privacy Privacy Policy: https://frexx.top/otbclock/privacy.html Terms of Use: https://frexx.top/otbclock/terms.html
Screenshots
Verdict
The clearest difference is ads: OTB Clock at none against Time Calculator + − × ÷'s shown. OTB Clock also leads on update cadence (every 2 weeks vs every 4 weeks). Time Calculator + − × ÷'s advantage is iOS requirement (15.0 vs 17.0). 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 Calculator + − × ÷ sells 2 one-off in-app purchases and OTB Clock sells 1 in-app purchase, starting at $19.99 per year. Whichever you choose, the download price is not the number that matters.
Time Calculator + − × ÷ ships an update every 4 weeks, OTB Clock every 2 weeks. The most recent releases landed on November 3, 2026 and October 24, 2026 respectively.
| Parameter | Time Calculator + − × ÷ | OTB Clock |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (25 ratings) — better | — |
| Positive reviews | 60.0% of reviews | — |
| Number of ratings | 25 — better | — |
| Update frequency | Every 4 weeks | Every 2 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 83 MB | 1 MB |
| Age rating | +4 | 4+ |
| Developer | NR Mobile App Solutions | 杰 向 |
In-app purchases
Time Calculator + − × ÷
- Annual plan$1.99
- 6-month plan$1.99
OTB Clock
- Premium — Yearly3 Days trial$19.991 Year
Questions
Is Time Calculator + − × ÷ free?
Is OTB Clock free?
Do Time Calculator + − × ÷ or OTB Clock have ads?
Which is updated more often, Time Calculator + − × ÷ or OTB Clock?
Other comparisons
