# Screen Time Tracker vs Periodic Table & Element Guide

The clearest difference is rating: Periodic Table & Element Guide at 5.0 against Screen Time Tracker's 3.9. Periodic Table & Element Guide also leads on update cadence (every 3 weeks vs every 5 months) and iOS requirement (17 vs 26.0). Screen Time Tracker's advantage is in-app purchases (none vs 2) and ratings volume (154 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. Periodic Table & Element Guide sells 2 in-app purchases, starting at $3.99 per 7 days. Screen Time Tracker asks for nothing beyond the download.

Periodic Table & Element Guide holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Screen Time Tracker has 154 ratings behind it against 1, so its average is the more settled of the two.

Screen Time Tracker ships an update every 5 months, Periodic Table & Element Guide every 3 weeks. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Screen Time Tracker | Periodic Table & Element Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (154 ratings)](https://appshunter.io/ios/app/screen-time-tracker/id6738397686/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/periodic-table-and-element-guide/id6758946775/reviews)** |
| Number of ratings | **154** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | **Free** | Freemium |
| Size | 2 MB | 8 MB |
| Requires iOS | 26.0 | **17** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jack Finnis](https://appshunter.io/developer/1633101066) | [Courtney Rawlings](https://appshunter.io/developer/1832354689) |

## What reviewers say

### Screen Time Tracker

[App page](https://appshunter.io/ios/app/screen-time-tracker/id6738397686)

This app helps you reduce unproductive screen time by blocking distracting apps and websites. It provides visual charts of your usage and allows you to filter out essential productive applications. Keep your data private and track your progress over time.

**Highlights:** Block unproductive apps and websites, Filter productive apps, Visualize screen time with charts, Track usage progress, See app time consumption, Private data storage

**Features:** macOS Compatibility

**In-app purchases:** none


### Periodic Table & Element Guide

[App page](https://appshunter.io/ios/app/periodic-table-and-element-guide/id6758946775)

An interactive and offline reference for all 118 chemical elements. Explore detailed information, search, and filter elements with a clean, accessible design. Ideal for students, teachers, and chemistry enthusiasts.

**Highlights:** Interactive periodic table, Detailed element information, Offline functionality, Search and filter elements, Dark mode support, Save favorite elements

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Periodic Pro Weekly | $3.99 | per 7 days |
| Periodic Pro Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Screen Time Tracker free?

Screen Time Tracker is free to download, with no in-app purchases.

### Is Periodic Table & Element Guide free?

Periodic Table & Element Guide is free to download, with in-app purchases available.

### Which has better reviews, Screen Time Tracker or Periodic Table & Element Guide?

Periodic Table & Element Guide is rated higher. Screen Time Tracker averages 3.9 out of 5 from 154 ratings, while Periodic Table & Element Guide averages 5.0 from 1 ratings.

### Do Screen Time Tracker or Periodic Table & Element Guide have ads?

Neither Screen Time Tracker nor Periodic Table & Element Guide shows ads.

### Which is updated more often, Screen Time Tracker or Periodic Table & Element Guide?

Screen Time Tracker ships an update every 5 months, and Periodic Table & Element Guide every 3 weeks. Most recently, Screen Time Tracker was updated on November 8, 2026 and Periodic Table & Element Guide on October 31, 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.*