# Skill 91 vs Study AI

The clearest difference is update cadence: Study AI at every 2 weeks against Skill 91's every 40 months. Study AI also leads on review sentiment (28% vs 0%). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Skill 91 sells 2 one-off in-app purchases and Study AI sells 4 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Skill 91 ships an update every 40 months, Study AI every 2 weeks. The most recent releases landed on August 30, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Skill 91 | Study AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (82 ratings)](https://appshunter.io/ios/app/study-ai-math-homework-helper/id6446278509/reviews)** |
| Number of ratings | — | **82** |
| Positive reviews | 0.0% of reviews | **27.8% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 40 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 279 MB | 67 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Neeraj Arora](https://appshunter.io/developer/1434568582) | [ApenGames OU](https://appshunter.io/developer/1588374246) |

## What reviewers say

### Skill 91

[App page](https://appshunter.io/ios/app/skill-91/id1547962099)

This app offers industry-focused skills with a strong emphasis on practical application. It aims to empower students to start earning immediately after graduation by providing marketable skills at affordable prices.

**Highlights:** Industry-focused skills, Practical application emphasis, Marketable skill development, Affordable pricing, Empowerment for immediate earning

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Blockchain | $10.99 | one-time |
| Excel Club | $12.99 | one-time |


### Study AI

[App page](https://appshunter.io/ios/app/study-ai-math-homework-helper/id6446278509)

This app uses AI to help solve complex math and science problems by analyzing photos. Get instant, step-by-step solutions and detailed explanations for a wide range of subjects, making learning more accessible.

**Highlights:** Intelligent photo analysis for scientific tasks, Instant, step-by-step solutions, Detailed explanations of problem-solving processes, Comprehensive subject coverage (algebra, chemistry, physics), User-friendly interface, AI-powered problem breakdown

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Freshman's Pack | $6.99 | per 7 days |
| Bachelor’s Pack | $14.99 | per month |
| Master's Pack | $99.99 | per year |
| Master's Pack | $99.99 | per year |


## Frequently asked questions

### Is Skill 91 free?

Skill 91 is free to download, with in-app purchases available.

### Is Study AI free?

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

### Do Skill 91 or Study AI have ads?

Neither Skill 91 nor Study AI shows ads.

### Which is updated more often, Skill 91 or Study AI?

Skill 91 ships an update every 40 months, and Study AI every 2 weeks. Most recently, Skill 91 was updated on August 30, 2026 and Study AI on September 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.*