# QFlash vs Stack

The clearest difference is device support: Stack at 3 against QFlash's 1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. QFlash sells 2 in-app purchases, starting at $4.99 per month and Stack sells 2 in-app purchases, starting at $1.49 per month. Whichever you choose, the download price is not the number that matters.

QFlash ships an update every 9 days, Stack every 8 days. The most recent releases landed on September 29, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | QFlash | Stack |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 8 days** |
| Size | 17 MB | 59 MB |
| Requires iOS | 17.6 | **16.4** |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Pokai Lee](https://appshunter.io/developer/1826542407) | [Fadi Zaid](https://appshunter.io/developer/1893682112) |

## What reviewers say

### QFlash

[App page](https://appshunter.io/ios/app/qflash-quick-flashcards/id6751162061)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | per month |
| Premium | $34.99 | per year |


### Stack

[App page](https://appshunter.io/ios/app/stack-tasks-and-reminders/id6762291589)

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $1.49 | per month |
| Yearly Premium | $14.99 | per year |


## Frequently asked questions

### Is QFlash free?

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

### Is Stack free?

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

### Do QFlash or Stack have ads?

Neither QFlash nor Stack shows ads.

### Which is updated more often, QFlash or Stack?

QFlash ships an update every 9 days, and Stack every 8 days. Most recently, QFlash was updated on September 29, 2026 and Stack on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*