# ThetaCalc vs Zero Duplicates

The clearest difference is rating: Zero Duplicates at 4.9 against ThetaCalc's 4.3. Zero Duplicates also leads on update cadence (weekly vs every 3 months) and ratings volume (47 vs 4). ThetaCalc's advantage is in-app purchases (none vs 3) and review sentiment (100% vs 67%). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Zero Duplicates sells 3 in-app purchases, starting at $1.99 per month. ThetaCalc asks for nothing beyond the download.

Zero Duplicates holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: Zero Duplicates has 47 ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 100% of ThetaCalc's written reviews are positive against 67% of Zero Duplicates's, so the app with the better star average is not the one people write more warmly about.

ThetaCalc ships an update every 3 months, Zero Duplicates weekly. The most recent releases landed on June 1, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | ThetaCalc | Zero Duplicates |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (4 ratings)](https://appshunter.io/ios/app/thetacalc/id1521614636/reviews) | **[4.9 (47 ratings)](https://appshunter.io/ios/app/zero-duplicates-file-cleaner/id6754661826/reviews)** |
| Number of ratings | 4 | **47** |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | **Free** | Freemium |
| Size | 1 MB | 15 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Felix Stehli](https://appshunter.io/developer/1521614638) | [Christopher Brock](https://appshunter.io/developer/1742267837) |

## What reviewers say

### ThetaCalc

[App page](https://appshunter.io/ios/app/thetacalc/id1521614636)

This utility app provides a Reverse Polish Notation (RPN) calculator. Users can extend its functionality by programming custom functions and equations using JavaScript.

**Highlights:** Reverse Polish Notation (RPN) calculator, User-programmable functions, JavaScript equation support, Extensible functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### Zero Duplicates

[App page](https://appshunter.io/ios/app/zero-duplicates-file-cleaner/id6754661826)

Reclaim iPhone storage by finding and deleting duplicate files, even those with different names. Advanced content analysis ensures accurate identification, and a privacy-first design keeps your data local. Safely organize documents, images, videos, and more.

**Highlights:** Advanced content analysis for real duplicates, Finds duplicates with different filenames, Supports documents, images, videos, audio, and downloads, Scans iCloud Drive and external storage, Privacy-first local scanning, Auto-select duplicates by newest/oldest, Preview before deleting

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $1.99 | per month |
| Yearly Subscription | $5.99 | per year |
| Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is ThetaCalc free?

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

### Is Zero Duplicates free?

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

### Which has better reviews, ThetaCalc or Zero Duplicates?

Zero Duplicates is rated higher. ThetaCalc averages 4.3 out of 5 from 4 ratings, while Zero Duplicates averages 4.9 from 47 ratings.

### Do ThetaCalc or Zero Duplicates have ads?

Neither ThetaCalc nor Zero Duplicates shows ads.

### Which is updated more often, ThetaCalc or Zero Duplicates?

ThetaCalc ships an update every 3 months, and Zero Duplicates weekly. Most recently, ThetaCalc was updated on June 1, 2026 and Zero Duplicates on September 18, 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.*