# ZiadaTime vs Calculator Sci Unit Converter

The clearest difference is price: ZiadaTime at Free against Calculator Sci Unit Converter's $1.99. ZiadaTime also leads on rating (5.0 vs 4.0) and update cadence (every 5 days vs monthly). Calculator Sci Unit Converter's advantage is in-app purchases (none vs 3) and iOS requirement (13.0 vs 17.0). On ratings volume, ads and device support there is nothing between them.

ZiadaTime is free to download; Calculator Sci Unit Converter costs $1.99 up front. ZiadaTime sells 3 one-off in-app purchases. Calculator Sci Unit Converter asks for nothing beyond the download.

ZiadaTime holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

ZiadaTime ships an update every 5 days, Calculator Sci Unit Converter monthly. The most recent releases landed on November 1, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | ZiadaTime | Calculator Sci Unit Converter |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/ziadatime-multi-stopwatch/id1105997210/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/calculator-sci-unit-converter/id6772422667/reviews) |
| Number of ratings | **3** | 2 |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Monthly |
| Monetization | **Free** | Paid |
| Size | 4 MB | 25 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Peter Purmonen](https://appshunter.io/developer/1105997209) | [Xiamen City Fanyou Network Technology Co., Ltd.](https://appshunter.io/developer/1842524161) |

## What reviewers say

### ZiadaTime

[App page](https://appshunter.io/ios/app/ziadatime-multi-stopwatch/id1105997210)

Manage multiple stopwatches simultaneously for various tasks. Start, stop, or reset them individually or all at once. Ideal for timing multiple events concurrently.

**Highlights:** Create a list of stopwatches, Start, stop, or reset stopwatches individually, Start, stop, or reset stopwatches simultaneously, Track elapsed time for multiple events, Ideal for coaching or cooking

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee | $0.99 | one-time |
| Snack | $1.99 | one-time |
| Lunch | $4.99 | one-time |


### Calculator Sci Unit Converter

[App page](https://appshunter.io/ios/app/calculator-sci-unit-converter/id6772422667)

This app offers a robust calculator with both standard and scientific functions. It includes a unit converter for various measurements and currency, plus helpful shortcuts for percentages, taxes, and tips. All calculations are saved locally for easy access.

**Highlights:** Standard and scientific calculator modes, Unit conversion for length, weight, temperature, currency, Full calculation history log, Percentage, tax, and tip calculation shortcuts, Offline functionality, Optimized for phone and tablet

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

**In-app purchases:** none


## Frequently asked questions

### Is ZiadaTime free?

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

### Is Calculator Sci Unit Converter free?

Calculator Sci Unit Converter costs $1.99, with no in-app purchases.

### Which has better reviews, ZiadaTime or Calculator Sci Unit Converter?

ZiadaTime is rated higher. ZiadaTime averages 5.0 out of 5 from 3 ratings, while Calculator Sci Unit Converter averages 4.0 from 2 ratings.

### Do ZiadaTime or Calculator Sci Unit Converter have ads?

Neither ZiadaTime nor Calculator Sci Unit Converter shows ads.

### Which is updated more often, ZiadaTime or Calculator Sci Unit Converter?

ZiadaTime ships an update every 5 days, and Calculator Sci Unit Converter monthly. Most recently, ZiadaTime was updated on November 1, 2026 and Calculator Sci Unit Converter on October 11, 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.*