# Periodic Table Pocket vs Pi Sequence

The clearest difference is in-app purchases: Periodic Table Pocket at none against Pi Sequence's 1. Periodic Table Pocket also leads on update cadence (weekly vs every 3 months) and iOS requirement (13.0 vs 17.0). Pi Sequence's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Pi Sequence sells 1 one-off in-app purchase. Periodic Table Pocket asks for nothing beyond the download.

Periodic Table Pocket ships an update weekly, Pi Sequence every 3 months. The most recent releases landed on September 20, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Periodic Table Pocket | Pi Sequence |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 3 months |
| Size | 26 MB | 29 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [昊 吴](https://appshunter.io/developer/1785101314) | [晓灵 潘](https://appshunter.io/developer/6781908128) |

## What reviewers say

### Periodic Table Pocket

[App page](https://appshunter.io/ios/app/periodic-table-pocket/id6754809340)

**Features:** macOS Compatibility

**In-app purchases:** none


### Pi Sequence

[App page](https://appshunter.io/ios/app/pi-sequence-memorize-pi/id6783736734)

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro | $3.99 | one-time |


## Frequently asked questions

### Is Periodic Table Pocket free?

Periodic Table Pocket is free to download, with no in-app purchases.

### Is Pi Sequence free?

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

### Do Periodic Table Pocket or Pi Sequence have ads?

Periodic Table Pocket shows ads; Pi Sequence does not.

### Which is updated more often, Periodic Table Pocket or Pi Sequence?

Periodic Table Pocket ships an update weekly, and Pi Sequence every 3 months. Most recently, Periodic Table Pocket was updated on September 20, 2026 and Pi Sequence on September 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.*