# Instant GSM vs Double memo

The clearest difference is ads: Instant GSM at none against Double memo's shown. Double memo's advantage is update cadence (every 2 weeks vs every 2 months). On price, in-app purchases, device support 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.

Instant GSM ships an update every 2 months, Double memo every 2 weeks. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Instant GSM | Double memo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Size | 38 MB | 37 MB |
| Requires iOS | **15.1** | 15.8.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MOHAnet Zrt](https://appshunter.io/developer/933965124) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### Instant GSM

[App page](https://appshunter.io/ios/app/instant-gsm/id1512371123)

**Features:** macOS Compatibility

**In-app purchases:** none


### Double memo

[App page](https://appshunter.io/ios/app/double-memo/id6502283245)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Instant GSM free?

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

### Is Double memo free?

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

### Do Instant GSM or Double memo have ads?

Double memo shows ads; Instant GSM does not.

### Which is updated more often, Instant GSM or Double memo?

Instant GSM ships an update every 2 months, and Double memo every 2 weeks. Most recently, Instant GSM was updated on October 27, 2026 and Double memo on October 25, 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.*