# Ops Clock vs Volume Calculator Pro

The clearest difference is rating: Ops Clock at 4.7 against Volume Calculator Pro's 4.0. Ops Clock also leads on in-app purchases (none vs 3) and update cadence (every 5 months vs every 31 months). On price, ratings volume, ads and monetization model there is nothing between them.

Both are free to download. Volume Calculator Pro sells 3 in-app purchases, starting at $0.99 per 7 days. Ops Clock asks for nothing beyond the download.

Ops Clock holds the better App Store score, 4.7 against 4.0. Both are backed by a comparable volume of ratings — 11 and 5 respectively.

Ops Clock ships an update every 5 months, Volume Calculator Pro every 31 months. The most recent releases landed on October 13, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Ops Clock | Volume Calculator Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (11 ratings)](https://appshunter.io/ios/app/ops-clock/id1352786229/reviews)** | [4.0 (5 ratings)](https://appshunter.io/ios/app/volume-calculator-pro/id1566518769/reviews) |
| Number of ratings | **11** | 5 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 31 months |
| Monetization | Free | Free |
| Size | 2 MB | 2 MB |
| Requires iOS | 15.0 | **14.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [James Kretchmar](https://appshunter.io/developer/1352786228) | [Anna Filobok](https://appshunter.io/developer/1613515832) |

## What reviewers say

### Ops Clock

[App page](https://appshunter.io/ios/app/ops-clock/id1352786229)

A versatile utility app offering a world clock with over 400 cities, unlimited timers, and three powerful calculators for time zone, time, and date arithmetic. It also features an event log to track real-time occurrences and elapsed times.

**Highlights:** World clock with 400+ cities, Unlimited count-up and countdown timers, Time zone, time, and date calculators, Event log with elapsed time tracking, Customizable labels and notifications

**Features:** Vision Pro support

**In-app purchases:** none


### Volume Calculator Pro

[App page](https://appshunter.io/ios/app/volume-calculator-pro/id1566518769)

This utility app quickly calculates and converts volumes between imperial and metric systems. Input dimensions like width, length, and depth to get instant results in various units. It supports multiple measurement systems for easy conversion.

**Highlights:** Real-time volume conversion, Imperial and metric unit support, Calculate volume from dimensions, Supports centimeters, meters, inches, feet, and yards, Outputs cubic centimeters, meters, inches, feet, and yards

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $0.99 | per 7 days |
| Premium Access | $1.99 | per month |
| Premium Access | $5.99 | per year |


## Frequently asked questions

### Is Ops Clock free?

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

### Is Volume Calculator Pro free?

Volume Calculator Pro is free to download, with in-app purchases available.

### Which has better reviews, Ops Clock or Volume Calculator Pro?

Ops Clock is rated higher. Ops Clock averages 4.7 out of 5 from 11 ratings, while Volume Calculator Pro averages 4.0 from 5 ratings.

### Do Ops Clock or Volume Calculator Pro have ads?

Neither Ops Clock nor Volume Calculator Pro shows ads.

### Which is updated more often, Ops Clock or Volume Calculator Pro?

Ops Clock ships an update every 5 months, and Volume Calculator Pro every 31 months. Most recently, Ops Clock was updated on October 13, 2026 and Volume Calculator Pro on October 3, 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.*