# AI Tutor vs ERReader

The clearest difference is device support: AI Tutor at 3 against ERReader's 1. AI Tutor also leads on iOS requirement (15.6 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. AI Tutor sells 14 in-app purchases, starting at $4.99 per 7 days and ERReader sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

AI Tutor ships an update every 8 days, ERReader weekly. The most recent releases landed on October 30, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | AI Tutor | ERReader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (1.2K ratings)](https://appshunter.io/ios/app/ai-tutor-professor-curious/id1609941536/reviews)** | — |
| Number of ratings | **1.2K** | — |
| Positive reviews | 65.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 229 MB | 4 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Zu Technologies Pvt Ltd](https://appshunter.io/developer/1609941538) | [YURI KOTENIATKIN](https://appshunter.io/developer/6775286848) |

## What reviewers say

### AI Tutor

[App page](https://appshunter.io/ios/app/ai-tutor-professor-curious/id1609941536)

Get 24/7 AI-powered homework help with interactive voice conversations. This app guides you step-by-step through tough subjects, transforming study into an engaging experience. It's designed to help you understand concepts rather than just providing answers.

**Highlights:** Interactive voice conversations with AI tutor, Step-by-step problem solving, Photo scanner for math and science problems, Multi-subject academic support, Learn concepts, don't just copy answers, 24/7 homework assistance

**Features:** macOS Compatibility

**In-app purchases (14)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ZuAI Weekly | $4.99 | per 7 days |
| ZuAI Unlimited | $7.99 | per 7 days |
| ZuAI Unlimited | $9.99 | per 7 days |
| ZuAI Unlimited Monthly | $9.99 | per month |
| Professor Curious Unlimited Monthly | $19.99 | per month |
| Professor Curious Unlimited Monthly | $19.99 | per month |
| ZuAI Monthly | $19.99 | per month |
| ZuAI Quarterly | $29.99 | per 3 months |
| Unlimited Quarterly | $34.99 | per 3 months |
| Professor Curious Unlimited | $49.99 | per year |
| Professor Curious Unlimited Yearly | $69.99 | per year |
| ZuAI Unlimited Yearly | $99.99 | per year |
| ZuAI Unlimited Yearly | $149.99 | per year |
| ZuAI Unlimited | $19.99 | one-time |

**What reviewers like**

- 🚀 Helpful for exam prep
- 👍 Great features like Quest, Scan & Solve, Study Magic
- 🤩 Instant feedback and support
- 💯 Worth the premium subscription

**What reviewers complain about**

- 🐛 Incorrect answers marked wrong
- 🔒 Difficult to unsubscribe
- 🔨 Buggy and crashes frequently
- 🤔 Locked sections make it harder to focus on needed areas

**Reported bugs**

- No questions shown in passages
- Verification issues with non-Indian phone numbers
- Missing chapters/content

**Requested features**

- Option to practice entire units instead of just parts
- Improve question formatting and wording


### ERReader

[App page](https://appshunter.io/ios/app/erreader-learn-russian/id6806375805)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full access | $4.99 | one-time |


## Frequently asked questions

### Is AI Tutor free?

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

### Is ERReader free?

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

### Do AI Tutor or ERReader have ads?

Neither AI Tutor nor ERReader shows ads.

### Which is updated more often, AI Tutor or ERReader?

AI Tutor ships an update every 8 days, and ERReader weekly. Most recently, AI Tutor was updated on October 30, 2026 and ERReader on October 26, 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.*