# Time Calculator + − × ÷ vs OTB Clock

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.

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.

## The numbers

| Metric | Time Calculator + − × ÷ | OTB Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (25 ratings)](https://appshunter.io/ios/app/time-calculator-plus/id1565799513/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 83 MB | 1 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [NR Mobile App Solutions](https://appshunter.io/developer/1480598778) | [杰 向](https://appshunter.io/developer/1860305678) |

## What reviewers say

### Time Calculator + − × ÷

[App page](https://appshunter.io/ios/app/time-calculator-plus/id1565799513)

Easily perform mathematical operations with hours and dates. This utility helps you quickly get accurate results for time-based calculations.

**Highlights:** Hour and date calculations, Mathematical operations, Quick results, Assists with time-based math

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual plan | $1.99 | one-time |
| 6-month plan | $1.99 | one-time |


### OTB Clock

[App page](https://appshunter.io/ios/app/otb-clock/id6762344990)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium — Yearly | $19.99 | per year |


## Frequently asked questions

### Is Time Calculator + − × ÷ free?

Time Calculator + − × ÷ is free to download, with in-app purchases available.

### Is OTB Clock free?

OTB Clock is free to download, with in-app purchases available.

### Do Time Calculator + − × ÷ or OTB Clock have ads?

Time Calculator + − × ÷ shows ads; OTB Clock does not.

### Which is updated more often, Time Calculator + − × ÷ or OTB Clock?

Time Calculator + − × ÷ ships an update every 4 weeks, and OTB Clock every 2 weeks. Most recently, Time Calculator + − × ÷ was updated on November 3, 2026 and OTB Clock on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*