# ADPI vs Membrane Technology Forum

The clearest difference is ads: ADPI at none against Membrane Technology Forum's shown. ADPI also leads on update cadence (every 3 weeks vs every 7 months). Membrane Technology Forum's advantage is device support (3 vs 1). On price, in-app purchases and iOS requirement there is nothing between them.

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

ADPI ships an update every 3 weeks, Membrane Technology Forum every 7 months. The most recent releases landed on September 20, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | ADPI | Membrane Technology Forum |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 7 months |
| Size | 161 MB | 43 MB |
| Requires iOS | **16.0** | 16.6 |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [EventBank](https://appshunter.io/developer/740353440) | [BNP Media Inc.](https://appshunter.io/developer/410320322) |

## What reviewers say

### ADPI

[App page](https://appshunter.io/ios/app/adpi/id6475652632)

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

**In-app purchases:** none


### Membrane Technology Forum

[App page](https://appshunter.io/ios/app/membrane-technology-forum/id6743992751)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ADPI free?

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

### Is Membrane Technology Forum free?

Membrane Technology Forum is free to download, with no in-app purchases.

### Do ADPI or Membrane Technology Forum have ads?

Membrane Technology Forum shows ads; ADPI does not.

### Which is updated more often, ADPI or Membrane Technology Forum?

ADPI ships an update every 3 weeks, and Membrane Technology Forum every 7 months. Most recently, ADPI was updated on September 20, 2026 and Membrane Technology Forum on June 1, 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.*