# Time Calc vs OptiMOON

The clearest difference is in-app purchases: OptiMOON at none against Time Calc's 4. OptiMOON also leads on iOS requirement (13.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Time Calc sells 4 in-app purchases, starting at $2.99 per 7 days. OptiMOON asks for nothing beyond the download.

Time Calc ships an update monthly, OptiMOON every 3 weeks. The most recent releases landed on September 22, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Time Calc | OptiMOON |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (234 ratings)](https://appshunter.io/ios/app/time-calc-time-calculator/id1279195300/reviews)** | — |
| Number of ratings | **234** | — |
| Positive reviews | 42.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Freemium | — |
| Size | 10 MB | 43 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ottorino Bruni](https://appshunter.io/developer/360574946) | [Porsche Slovenija d.o.o](https://appshunter.io/developer/1446542306) |

## What reviewers say

### Time Calc

[App page](https://appshunter.io/ios/app/time-calc-time-calculator/id1279195300)

Easily add, subtract, and compare times with this intuitive calculator. Perfect for logging hours, tracking shifts, or planning projects, it handles hours, minutes, and seconds with precision. Convert results and sync across devices.

**Highlights:** Add, subtract, multiply, divide time, Calculate time differences, Add/subtract time from dates, Convert results to various units, Convert between decimal and HH:MM:SS, Save and share calculations, iCloud sync

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Week | $2.99 | per 7 days |
| 1 Month | $4.99 | per month |
| 1 Year | $11.99 | per year |
| Forever | $29.99 | one-time |

**What reviewers like**

- 👍 Visual calculation aid
- 👍 Helpful for pilots
- 👍 Simple and fast
- 👍 Good for schoolwork
- 👍 Easy to use

**What reviewers complain about**

-  anúncios Pop-up ads
- 💰 Subscription required for basic functions
- 💸 Unreasonable cost for basic features
- 🚫 Free version is very limited
- 👎 No restore purchase option

**Reported bugs**

- Purchase not restoring after device change
- Cannot restore previous purchase
- Pop-up ads are irritating
- Free version doesn't work
- Purchase not restoring

**Requested features**

- Ad-free version option
- Option to negate inputting seconds
- Improve restore purchase functionality
- Fix night mode functionality
- Fix display of numbers before action


### OptiMOON

[App page](https://appshunter.io/ios/app/optimoon/id6736896444)

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

**In-app purchases:** none


## Frequently asked questions

### Is Time Calc free?

Time Calc is free to download, with in-app purchases available.

### Is OptiMOON free?

OptiMOON is free to download, with no in-app purchases.

### Do Time Calc or OptiMOON have ads?

Neither Time Calc nor OptiMOON shows ads.

### Which is updated more often, Time Calc or OptiMOON?

Time Calc ships an update monthly, and OptiMOON every 3 weeks. Most recently, Time Calc was updated on September 22, 2026 and OptiMOON on September 12, 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.*