# Stack Master vs Birthday Reminder  | On Time

The clearest difference is price: Birthday Reminder  | On Time at Free against Stack Master's $24.99. Birthday Reminder  | On Time also leads on update cadence (weekly vs every 3 weeks). Stack Master's advantage is iOS requirement (11.0 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

Birthday Reminder  | On Time is free to download; Stack Master costs $24.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Stack Master ships an update every 3 weeks, Birthday Reminder  | On Time weekly. The most recent releases landed on October 8, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Stack Master | Birthday Reminder  | On Time |
| --- | --- | --- |
| Price | $24.99 | **Free** |
| Rating | **[3.8 (9 ratings)](https://appshunter.io/ios/app/stack-master/id1272229335/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Paid | — |
| Size | 36 MB | 6 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Devious-Monkey](https://appshunter.io/developer/388388527) | [Zeki Baklan](https://appshunter.io/developer/1695593099) |

## What reviewers say

### Stack Master

[App page](https://appshunter.io/ios/app/stack-master/id1272229335)

Master your favorite card stacks with this mobile training application. It offers multiple training modes and challenges to analyze your weaknesses and improve your learning curve. Supports various pre-set and custom stacks.

**Highlights:** Multiple training modes, 18 funny challenges, Supports pre-set stacks, Create custom stacks, Publish scores and compare with friends, Specialized training modules

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

**In-app purchases:** none


### Birthday Reminder  | On Time

[App page](https://appshunter.io/ios/app/birthday-reminder-on-time/id6450901900)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Stack Master free?

Stack Master costs $24.99, with no in-app purchases.

### Is Birthday Reminder  | On Time free?

Birthday Reminder  | On Time is free to download, with no in-app purchases.

### Do Stack Master or Birthday Reminder  | On Time have ads?

Neither Stack Master nor Birthday Reminder  | On Time shows ads.

### Which is updated more often, Stack Master or Birthday Reminder  | On Time?

Stack Master ships an update every 3 weeks, and Birthday Reminder  | On Time weekly. Most recently, Stack Master was updated on October 8, 2026 and Birthday Reminder  | On Time on September 30, 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.*