# Unit Converter Pro HD. vs Periodic Table PRO

The clearest difference is price: Periodic Table PRO at Free against Unit Converter Pro HD.'s $0.99. Unit Converter Pro HD.'s advantage is review sentiment (87% vs 50%) and in-app purchases (none vs 8). On rating, ratings volume, update cadence and ads there is nothing between them.

Periodic Table PRO is free to download; Unit Converter Pro HD. costs $0.99 up front. Periodic Table PRO sells 8 one-off in-app purchases. Unit Converter Pro HD. asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Unit Converter Pro HD. against 4.6 for Periodic Table PRO. Both are backed by a comparable volume of ratings — 187 and 87 respectively. Written reviews are what separate them: 87% of Unit Converter Pro HD.'s written reviews are positive against 50% of Periodic Table PRO's.

Unit Converter Pro HD. ships an update every 2 months, Periodic Table PRO every 6 weeks. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Unit Converter Pro HD. | Periodic Table PRO |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [4.6 (187 ratings)](https://appshunter.io/ios/app/unit-converter-pro-hd/id458584668/reviews) | **[4.6 (87 ratings)](https://appshunter.io/ios/app/periodic-table-pro/id1601545941/reviews)** |
| Number of ratings | **187** | 87 |
| Positive reviews | **86.7% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | **Free** | Paid |
| Size | 13 MB | 210 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [良峰 侯](https://appshunter.io/developer/654444245) | [AGILE FLEX TECH SRL](https://appshunter.io/developer/1601049602) |

## What reviewers say

### Unit Converter Pro HD.

[App page](https://appshunter.io/ios/app/unit-converter-pro-hd/id458584668)

Easily convert between over 700 units of measure across 30 categories. This powerful tool acts as a universal assistant for all your conversion needs, saving you time and effort.

**Highlights:** 30 conversion categories, Over 700 units of measure, Backspace key for corrections, Intuitive and easy to use, Supports Dark Mode

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Fast and efficient
- 👍 Easy to use
- 👍 Comprehensive unit conversions
- 👍 Accurate calculations
- 👍 Handy and useful

**What reviewers complain about**

- 🐛 Missing some important units
- 🔍 Difficult to navigate and find desired units
- 🔍 Cluttered interface with too many options
- 🔋 High battery consumption

**Reported bugs**

- Incorrect fuel consumption conversions
- Conversion values disappearing after update

**Requested features**

- Add support for more units (e.g. knots, stone, electron volts)
- Improve navigation and make it easier to find desired units
- Add portrait mode support
- Optimize interface for better usability


### Periodic Table PRO

[App page](https://appshunter.io/ios/app/periodic-table-pro/id1601545941)

Explore a virtual chemistry lab with interactive experiments and detailed information on all chemical elements. Features include atom structure simulations, downloadable PDFs, and studying analytics to enhance learning. Supports multiple languages and offers a cohesive, functional design.

**Highlights:** Virtual chemistry lab with experiments, Detailed chemical element information, Atom structure simulations, Downloadable element PDFs, Studying analytics, Multi-language support

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SPECIAL OFFER! | $9.99 | one-time |
| Chernobyl experiments | $9.99 | one-time |
| Explosive experiments | $9.99 | one-time |
| Funny experiments | $9.99 | one-time |
| Experiments with fire | $9.99 | one-time |
| Gas bubbles experiments | $9.99 | one-time |
| Melting experiments | $9.99 | one-time |
| Oxidation experiments | $9.99 | one-time |


## Frequently asked questions

### Is Unit Converter Pro HD. free?

Unit Converter Pro HD. costs $0.99, with no in-app purchases.

### Is Periodic Table PRO free?

Periodic Table PRO is free to download, with in-app purchases available.

### Which has better reviews, Unit Converter Pro HD. or Periodic Table PRO?

Periodic Table PRO is rated higher. Unit Converter Pro HD. averages 4.6 out of 5 from 187 ratings, while Periodic Table PRO averages 4.6 from 87 ratings.

### Do Unit Converter Pro HD. or Periodic Table PRO have ads?

Neither Unit Converter Pro HD. nor Periodic Table PRO shows ads.

### Which is updated more often, Unit Converter Pro HD. or Periodic Table PRO?

Unit Converter Pro HD. ships an update every 2 months, and Periodic Table PRO every 6 weeks. Most recently, Unit Converter Pro HD. was updated on October 26, 2026 and Periodic Table PRO on October 24, 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.*