# DifCal vs (Open Source) Periodic Table

The clearest difference is update cadence: (Open Source) Periodic Table at fortnightly against DifCal's every 15 months. DifCal's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 16.4). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DifCal ships an update every 15 months, (Open Source) Periodic Table fortnightly. The most recent releases landed on October 10, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | DifCal | (Open Source) Periodic Table |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Fortnightly** |
| Size | 9 MB | 47 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sean Brennan](https://appshunter.io/developer/898026482) | [AHMET EMRE DEDELER](https://appshunter.io/developer/1870913629) |

## What reviewers say

### DifCal

[App page](https://appshunter.io/ios/app/difcal/id898026479)

**Features:** Vision Pro support

**In-app purchases:** none


### (Open Source) Periodic Table

[App page](https://appshunter.io/ios/app/open-source-periodic-table/id6781818611)

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

**In-app purchases:** none


## Frequently asked questions

### Is DifCal free?

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

### Is (Open Source) Periodic Table free?

(Open Source) Periodic Table is free to download, with no in-app purchases.

### Do DifCal or (Open Source) Periodic Table have ads?

Neither DifCal nor (Open Source) Periodic Table shows ads.

### Which is updated more often, DifCal or (Open Source) Periodic Table?

DifCal ships an update every 15 months, and (Open Source) Periodic Table fortnightly. Most recently, DifCal was updated on October 10, 2026 and (Open Source) Periodic Table on October 5, 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.*