# Calculator· vs OTB Clock

The clearest difference is ads: OTB Clock at none against Calculator·'s shown. OTB Clock also leads on update cadence (every 2 weeks vs every 8 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Calculator· sells 1 one-off in-app purchase 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.

Calculator· ships an update every 8 months, OTB Clock every 2 weeks. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Calculator· | OTB Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (219 ratings)](https://appshunter.io/ios/app/calculator-easy-to-use/id896211341/reviews)** | — |
| Number of ratings | **219** | — |
| Positive reviews | 41.4% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 8 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 1 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Netviking AB](https://appshunter.io/developer/425652251) | [杰 向](https://appshunter.io/developer/1860305678) |

## What reviewers say

### Calculator·

[App page](https://appshunter.io/ios/app/calculator-easy-to-use/id896211341)

A straightforward calculator app designed for simplicity and ease of use. It features large buttons and a clear display, supporting basic arithmetic operations like addition, subtraction, multiplication, and division.

**Highlights:** Large buttons, Clear display, Addition, Subtraction, Multiplication, Division

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad Removal | $0.99 | 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 Calculator· free?

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 Calculator· or OTB Clock have ads?

Calculator· shows ads; OTB Clock does not.

### Which is updated more often, Calculator· or OTB Clock?

Calculator· ships an update every 8 months, and OTB Clock every 2 weeks. Most recently, Calculator· was updated on October 22, 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.*