# Ops Clock vs ExSciCalc

The clearest difference is price: Ops Clock at Free against ExSciCalc's $1.99. Ops Clock also leads on ratings volume (11 vs 1). ExSciCalc's advantage is update cadence (every 3 weeks vs every 5 months) and rating (5.0 vs 4.7). On review sentiment, ads, in-app purchases and device support there is nothing between them.

Ops Clock is free to download; ExSciCalc costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ExSciCalc holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Ops Clock has 11 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Ops Clock ships an update every 5 months, ExSciCalc every 3 weeks. The most recent releases landed on September 28, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Ops Clock | ExSciCalc |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [4.7 (11 ratings)](https://appshunter.io/ios/app/ops-clock/id1352786229/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/exscicalc/id1625177287/reviews)** |
| Number of ratings | **11** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | **Free** | Paid |
| Size | 2 MB | 1 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [James Kretchmar](https://appshunter.io/developer/1352786228) | [Dale C Koepp](https://appshunter.io/developer/331525420) |

## 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


### ExSciCalc

[App page](https://appshunter.io/ios/app/exscicalc/id1625177287)

This calculator offers enhanced precision and memory beyond standard devices. It includes advanced functions for statistics, physics, and mathematics, alongside common calculations and unit conversions.

**Highlights:** Extended precision (30+ digits), Extended memory (main + 10 auxiliary), Scroll windows for button access, Statistical calculations, Physical and mathematical constants, Unit conversions, Roots of equations, Special relativity calculations

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ops Clock free?

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

### Is ExSciCalc free?

ExSciCalc costs $1.99, with no in-app purchases.

### Which has better reviews, Ops Clock or ExSciCalc?

ExSciCalc is rated higher. Ops Clock averages 4.7 out of 5 from 11 ratings, while ExSciCalc averages 5.0 from 1 ratings.

### Do Ops Clock or ExSciCalc have ads?

Neither Ops Clock nor ExSciCalc shows ads.

### Which is updated more often, Ops Clock or ExSciCalc?

Ops Clock ships an update every 5 months, and ExSciCalc every 3 weeks. Most recently, Ops Clock was updated on September 28, 2026 and ExSciCalc on October 2, 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.*