# Simple Study Stamp vs Stackd

The clearest difference is in-app purchases: Simple Study Stamp at none against Stackd's 1. Stackd's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Stackd sells 1 one-off in-app purchase. Simple Study Stamp asks for nothing beyond the download.

Simple Study Stamp ships an update every 10 days, Stackd fortnightly. The most recent releases landed on September 12, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Simple Study Stamp | Stackd |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 10 days** | Fortnightly |
| Size | 10 MB | 3 MB |
| Requires iOS | **17.0** | 18 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Futoshi Akahoshi](https://appshunter.io/developer/1811302322) | [Nene Nakagawa](https://appshunter.io/developer/1821103094) |

## What reviewers say

### Simple Study Stamp

[App page](https://appshunter.io/ios/app/simple-study-stamp/id6757266510)

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

**In-app purchases:** none


### Stackd

[App page](https://appshunter.io/ios/app/stackd-study-timer-and-tracker/id6761293821)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stackd Pro | $1.99 | one-time |


## Frequently asked questions

### Is Simple Study Stamp free?

Simple Study Stamp is free to download, with no in-app purchases.

### Is Stackd free?

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

### Do Simple Study Stamp or Stackd have ads?

Simple Study Stamp shows ads; Stackd does not.

### Which is updated more often, Simple Study Stamp or Stackd?

Simple Study Stamp ships an update every 10 days, and Stackd fortnightly. Most recently, Simple Study Stamp was updated on September 12, 2026 and Stackd on September 14, 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.*