# QuackGoals vs DevilBrain

The clearest difference is update cadence: DevilBrain at every 9 days against QuackGoals's every 6 weeks. DevilBrain also leads on review sentiment (62% vs 50%) and iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. QuackGoals sells 3 one-off in-app purchases and DevilBrain sells 7 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

QuackGoals ships an update every 6 weeks, DevilBrain every 9 days. The most recent releases landed on October 2, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | QuackGoals | DevilBrain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/quackgoals/id6752471287/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | **61.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 54 MB | 70 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [杭州未智科技有限公司](https://appshunter.io/developer/1494661071) | [青青 吴](https://appshunter.io/developer/1594811700) |

## What reviewers say

### QuackGoals

[App page](https://appshunter.io/ios/app/quackgoals/id6752471287)

This app encourages a balanced approach to productivity by allowing users to earn leisure time through focused work or study. It promotes guilt-free relaxation by ensuring downtime is earned, with automatic reminders to prevent overuse.

**Highlights:** Earn leisure time through focused work, Redeem time for social media, gaming, videos, Automatic leisure time reminders, Guilt-free relaxation philosophy, Planned relaxation for sustainable diligence

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 300鸭力 | $0.99 | one-time |
| 600鸭力 | $1.99 | one-time |
| 1200鸭力 | $2.99 | one-time |


### DevilBrain

[App page](https://appshunter.io/ios/app/devilbrain-brain-training/id6759943746)

This app offers cognitive conditioning and brain sharpening exercises to improve focus and memory. It provides personalized training plans and assessments to help users enhance their mental capabilities and combat phone addiction.

**Highlights:** Brain Age Assessment, Customized Training Plans, Digital Memory Challenges, Schulte Focus Training, Personal Adaptive Training, Cognitive Conditioning

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $3.99 | per 7 days |
| Monthly | $4.99 | per month |
| Monthly | $4.99 | per month |
| Monthly | $6.99 | per month |
| Yearly | $12.99 | per year |
| 3 Years | $39.99 | one-time |
| Permanent VIP | $39.99 | one-time |


## Frequently asked questions

### Is QuackGoals free?

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

### Is DevilBrain free?

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

### Do QuackGoals or DevilBrain have ads?

Neither QuackGoals nor DevilBrain shows ads.

### Which is updated more often, QuackGoals or DevilBrain?

QuackGoals ships an update every 6 weeks, and DevilBrain every 9 days. Most recently, QuackGoals was updated on October 2, 2026 and DevilBrain on October 8, 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.*