# SDRUMS Primary GM School vs Whyfy

The clearest difference is update cadence: Whyfy at every 9 days against SDRUMS Primary GM School's every 34 months. Whyfy also leads on iOS requirement (15.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SDRUMS Primary GM School ships an update every 34 months, Whyfy every 9 days. The most recent releases landed on October 5, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | SDRUMS Primary GM School | Whyfy |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 34 months | **Every 9 days** |
| Monetization | — | Free |
| Size | 7 MB | 14 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Pixeta App Lab](https://appshunter.io/developer/992021365) | [超 范](https://appshunter.io/developer/1747641417) |

## What reviewers say

### SDRUMS Primary GM School

[App page](https://appshunter.io/ios/app/sdrums-primary-gm-school/id1546541514)

**Features:** Vision Pro support

**In-app purchases:** none


### Whyfy

[App page](https://appshunter.io/ios/app/whyfy/id6503213259)

This AI-powered assistant helps you uncover the root causes of problems by generating insightful questions and potential answers. It offers web search integration, personalized record-keeping, and the ability to explore multiple answer branches to deepen your understanding.

**Highlights:** AI-generated questions and answers, Web search integration, Personalized question history, Continuous questioning for root cause analysis, Flexible archiving and sharing, Multiple answer branches

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

**In-app purchases:** none


## Frequently asked questions

### Is SDRUMS Primary GM School free?

SDRUMS Primary GM School is free to download, with no in-app purchases.

### Is Whyfy free?

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

### Do SDRUMS Primary GM School or Whyfy have ads?

Neither SDRUMS Primary GM School nor Whyfy shows ads.

### Which is updated more often, SDRUMS Primary GM School or Whyfy?

SDRUMS Primary GM School ships an update every 34 months, and Whyfy every 9 days. Most recently, SDRUMS Primary GM School was updated on October 5, 2026 and Whyfy on October 10, 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.*