# Y Combinator vs Undumb

The clearest difference is rating: Undumb at 5.0 against Y Combinator's 4.1. Y Combinator's advantage is in-app purchases (none vs 2) and ratings volume (27 vs 3). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Undumb sells 2 in-app purchases, starting at $5.00 per month. Y Combinator asks for nothing beyond the download.

Undumb holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: Y Combinator has 27 ratings behind it against 3, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 23, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Y Combinator | Undumb |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (27 ratings)](https://appshunter.io/ios/app/y-combinator/id6464718392/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/undumb-brain-training/id6800177759/reviews)** |
| Number of ratings | **27** | 3 |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | **Free** | Freemium |
| Size | 85 MB | 56 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Y Combinator](https://appshunter.io/developer/1706164044) | [FigLantern LLC](https://appshunter.io/developer/6800177761) |

## What reviewers say

### Y Combinator

[App page](https://appshunter.io/ios/app/y-combinator/id6464718392)

Access Y Combinator's extensive library of startup content, including YouTube videos, podcasts, and essays. It also serves as a mobile client for Hacker News, offering the latest startup news for founders and programmers. Additional features are available for YC-funded founders.

**Highlights:** Organized YC YouTube videos, Startup School content, On-the-go podcast listening, Hacker News mobile client, YC founder-only knowledge base, Access Bookface feed and messages

**In-app purchases:** none


### Undumb

[App page](https://appshunter.io/ios/app/undumb-brain-training/id6800177759)

This app offers daily brain workouts designed to enhance creativity, critical thinking, and focus, especially for those using AI tools regularly. It provides hand-crafted puzzles to combat 'AI-brain-drain' and helps users track their cognitive progress.

**Highlights:** Daily brain workouts, Enhances creativity, Improves critical thinking, Boosts focus, Cognitive profile tracking, Progress trending over time

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Undumb Monthly | $5.00 | per month |
| Undumb Annual | $30.00 | per year |


## Frequently asked questions

### Is Y Combinator free?

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

### Is Undumb free?

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

### Which has better reviews, Y Combinator or Undumb?

Undumb is rated higher. Y Combinator averages 4.1 out of 5 from 27 ratings, while Undumb averages 5.0 from 3 ratings.

### Do Y Combinator or Undumb have ads?

Neither Y Combinator nor Undumb shows ads.

### Which is updated more often, Y Combinator or Undumb?

Y Combinator ships an update weekly, and Undumb weekly. Most recently, Y Combinator was updated on October 23, 2026 and Undumb on October 18, 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.*