# Learn Ruby Fast vs 0Day

The clearest difference is update cadence: 0Day at every 5 days against Learn Ruby Fast's every 6 months. Learn Ruby Fast's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 18.0). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Learn Ruby Fast sells 2 in-app purchases, starting at $9.99 per month and 0Day sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Learn Ruby Fast against 5.0 for 0Day. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Learn Ruby Fast ships an update every 6 months, 0Day every 5 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Learn Ruby Fast | 0Day |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/learn-ruby-fast/id6754417791/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/0day-cve-and-exploit-alerts/id6761655372/reviews) |
| Number of ratings | **3** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 47 MB | 10 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [Dalvin Digital Design LLC](https://appshunter.io/developer/1814271404) | [Richard Lous](https://appshunter.io/developer/1890695617) |

## What reviewers say

### Learn Ruby Fast

[App page](https://appshunter.io/ios/app/learn-ruby-fast/id6754417791)

Master Ruby programming fundamentals with interactive lessons designed for beginners. This app guides you through essential coding skills, making it accessible to learn on your mobile device. Explore the basics of app and website development.

**Highlights:** Guided programming lessons, Core Ruby skills, Beginner-friendly, Mobile learning, App and website development basics

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $9.99 | per month |
| Pro Annually | $59.99 | per year |


### 0Day

[App page](https://appshunter.io/ios/app/0day-cve-and-exploit-alerts/id6761655372)

Receive immediate alerts for zero-day vulnerabilities, supply chain attacks, and compromised packages relevant to your specific technology stack. Get early warnings before they hit the news cycle, enabling proactive security measures.

**Highlights:** Zero-day vulnerability alerts, Supply chain attack notifications, Compromised package warnings, Stack-aware filtering, Early warning system, Push notifications, Full alert archive

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 0Day Pro | $3.99 | per month |
| 0Day Pro | $29.99 | per year |


## Frequently asked questions

### Is Learn Ruby Fast free?

Learn Ruby Fast is free to download, with in-app purchases available.

### Is 0Day free?

0Day is free to download, with in-app purchases available.

### Which has better reviews, Learn Ruby Fast or 0Day?

Learn Ruby Fast and 0Day are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.

### Do Learn Ruby Fast or 0Day have ads?

Neither Learn Ruby Fast nor 0Day shows ads.

### Which is updated more often, Learn Ruby Fast or 0Day?

Learn Ruby Fast ships an update every 6 months, and 0Day every 5 days. Most recently, Learn Ruby Fast was updated on October 24, 2026 and 0Day on October 24, 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.*