Calculator· vs OTB Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator·
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.
- Large buttons
- Clear display
- Addition
- Subtraction
- Multiplication
- Division
Read full descriptionHide full description
This is a super simple calculator with large buttons. It supports the operations you need: addition, subtraction, multiplication and division. Features: ◉ Retina display ◉ Big buttons ◉ A large display ◉ It supports adding, subtracting, multiplying, and dividing. ◉ Very useful and easy to use. Download this calculator today!
OTB Clock
Read full descriptionHide full description
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 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.
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. 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.
| Parameter | Calculator· | OTB Clock |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (219 ratings) — better | — |
| Positive reviews | 41.4% of reviews | — |
| Number of ratings | 219 — better | — |
| Update frequency | Every 8 months | Every 2 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 16 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Netviking AB | 杰 向 |
In-app purchases
Calculator·
- Ad Removal$0.99
OTB Clock
- Premium — Yearly3 Days trial$19.991 Year
