# Membit vs SD Primer

The clearest difference is iOS requirement: Membit at 15.1 against SD Primer's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Membit sells 1 in-app purchase, starting at $9.99 per month and SD Primer sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Membit ships an update every 3 days, SD Primer every 5 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Membit | SD Primer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 5 days |
| Size | 39 MB | 20 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shao Liu](https://appshunter.io/developer/1866774007) | [Ernesto Hilvano](https://appshunter.io/developer/1740292069) |

## What reviewers say

### Membit

[App page](https://appshunter.io/ios/app/membit-vocabulary-builder/id6757413210)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Membit Pro | $9.99 | per month |


### SD Primer

[App page](https://appshunter.io/ios/app/sd-primer/id6758010557)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SDPrimer Pro | $9.99 | per month |
| SDPrimer Pro | $99.99 | per year |


## Frequently asked questions

### Is Membit free?

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

### Is SD Primer free?

SD Primer is free to download, with in-app purchases available.

### Do Membit or SD Primer have ads?

Neither Membit nor SD Primer shows ads.

### Which is updated more often, Membit or SD Primer?

Membit ships an update every 3 days, and SD Primer every 5 days. Most recently, Membit was updated on October 28, 2026 and SD Primer 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.*