# Periodic Table of Elements+ vs CDR RD Exam Prep 2026

The clearest difference is in-app purchases: Periodic Table of Elements+ at none against CDR RD Exam Prep 2026's 3. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. CDR RD Exam Prep 2026 sells 3 in-app purchases, starting at $29.99 per month. Periodic Table of Elements+ asks for nothing beyond the download.

## The numbers

| Metric | Periodic Table of Elements+ | CDR RD Exam Prep 2026 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (58 ratings)](https://appshunter.io/ios/app/periodic-table-of-elements-plus/id6447423433/reviews)** | — |
| Number of ratings | **58** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 7 months | — |
| Monetization | Ad-supported | — |
| Size | 38 MB | 48 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sonya Marcarelli](https://appshunter.io/developer/409702204) | [Apperture Limited](https://appshunter.io/developer/1727867515) |

## What reviewers say

### Periodic Table of Elements+

[App page](https://appshunter.io/ios/app/periodic-table-of-elements-plus/id6447423433)

This educational app provides a compact Mendeleev's table with extensive chemical element data. It allows users to create molecular formulas, calculate their mass, and access detailed Wikipedia information for each element. Designed for students and chemistry enthusiasts, it offers VoiceOver accessibility and efficient space utilization.

**Highlights:** Mendeleev's table reference, Molecular formula composer, Molecular mass computation, VoiceOver accessibility, Links to Wikipedia pages, Copyable element information

**Features:** Vision Pro support

**In-app purchases:** none


### CDR RD Exam Prep 2026

[App page](https://appshunter.io/ios/app/cdr-rd-exam-prep-2026/id6798265607)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Subscription | $29.99 | per month |
| Premium Subscription | $29.99 | per month |
| Premium Subscription | $118.99 | per year |


## Frequently asked questions

### Is Periodic Table of Elements+ free?

Periodic Table of Elements+ is free to download, with no in-app purchases.

### Is CDR RD Exam Prep 2026 free?

CDR RD Exam Prep 2026 is free to download, with in-app purchases available.

### Do Periodic Table of Elements+ or CDR RD Exam Prep 2026 have ads?

Both Periodic Table of Elements+ and CDR RD Exam Prep 2026 show ads.

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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.*