# Vivid Barrel vs Brain Duo

The clearest difference is in-app purchases: Vivid Barrel at none against Brain Duo's 2. Brain Duo's advantage is update cadence (every 3 days vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Brain Duo sells 2 in-app purchases, starting at $3.99 per month. Vivid Barrel asks for nothing beyond the download.

Vivid Barrel ships an update every 6 months, Brain Duo every 3 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Vivid Barrel | Brain Duo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/brain-duo-brain-training/id6741551111/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 192 MB | 334 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [宗昌 揭](https://appshunter.io/developer/1807122570) | [Brain Duo Tech LLC](https://appshunter.io/developer/1794668165) |

## What reviewers say

### Vivid Barrel

[App page](https://appshunter.io/ios/app/vivid-barrel/id6741504427)

**Features:** macOS Compatibility

**In-app purchases:** none


### Brain Duo

[App page](https://appshunter.io/ios/app/brain-duo-brain-training/id6741551111)

Engage in fun games designed to enhance focus, concentration, problem-solving, and mental math. Discover more about yourself through personality and IQ tests while fostering personal growth and a sharper mind.

**Highlights:** Personalized brain workouts, Focus and concentration games, Problem-solving challenges, Mental math exercises, Personality and IQ tests, Promotes self-improvement

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access - Monthly | $3.99 | per month |
| Lifetime - Premium Access | $19.99 | one-time |


## Frequently asked questions

### Is Vivid Barrel free?

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

### Is Brain Duo free?

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

### Do Vivid Barrel or Brain Duo have ads?

Neither Vivid Barrel nor Brain Duo shows ads.

### Which is updated more often, Vivid Barrel or Brain Duo?

Vivid Barrel ships an update every 6 months, and Brain Duo every 3 days. Most recently, Vivid Barrel was updated on October 28, 2026 and Brain Duo on October 24, 2026.

---

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