# Zerroday vs Devmaxx

The clearest difference is review sentiment: Zerroday at 89% against Devmaxx's 17%. Zerroday also leads on monetization model (free vs subscription) and iOS requirement (15.0 vs 17.5). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Zerroday sells 5 one-off in-app purchases and Devmaxx sells 2 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

Zerroday ships an update every 10 days, Devmaxx every 2 weeks. The most recent releases landed on October 1, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Zerroday | Devmaxx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (520 ratings)](https://appshunter.io/ios/app/devmaxx/id6758278144/reviews)** |
| Number of ratings | — | **520** |
| Positive reviews | **88.9% of reviews** | 17.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 weeks |
| Monetization | **Free** | Subscription |
| Size | 61 MB | 29 MB |
| Requires iOS | **15.0** | 17.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Zerroday](https://appshunter.io/developer/1856124924) | [Arjay McCandless LLC](https://appshunter.io/developer/1871931520) |

## What reviewers say

### Zerroday

[App page](https://appshunter.io/ios/app/zerroday/id6755754776)

This app helps users build confidence and discipline by analyzing their responses to market conditions. It provides tools for learning, reflection, and analysis based on psychological patterns, focusing on hypothetical decision-making in a safe, educational environment.

**Highlights:** AI-guided decision reflection, Hypothetical choice recording, Emotional pattern feedback, Live market reference data, Practice mode for safe learning, Learning journal and progress tracking

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pass | $0.99 | one-time |
| Daily Pass | $0.99 | one-time |
| Monthly Plan | $2.99 | one-time |
| Safety Nets Discount | $7.99 | one-time |
| Safety Nets | $9.99 | one-time |


### Devmaxx

[App page](https://appshunter.io/ios/app/devmaxx/id6758278144)

This app provides a daily system design question to help software engineers master essential skills for interviews and career growth. It offers clear explanations, linked resources, and a private community for learning and practice.

**Highlights:** Daily system design questions, Clear explanations and answer breakdowns, Linked learning resources, Access to previous questions, Private developer community, Progress tracking

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Devmaxx Subscription | $8.99 | per month |
| Annual Devmaxx Subscription | $59.99 | per year |


## Frequently asked questions

### Is Zerroday free?

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

### Is Devmaxx free?

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

### Do Zerroday or Devmaxx have ads?

Neither Zerroday nor Devmaxx shows ads.

### Which is updated more often, Zerroday or Devmaxx?

Zerroday ships an update every 10 days, and Devmaxx every 2 weeks. Most recently, Zerroday was updated on October 1, 2026 and Devmaxx on October 13, 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.*