# Big Brain vs Eureka

The clearest difference is monetization model: Eureka at free with in-app purchases against Big Brain's subscription. Eureka also leads on review sentiment (100% vs 69%). Big Brain's advantage is ratings volume (1.3K vs 13). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Big Brain sells 6 in-app purchases, starting at $1.99 per 7 days and Eureka sells 8 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.6 for Big Brain against 4.5 for Eureka. That said, the two scores are not equally well evidenced: Big Brain has 1.3K ratings behind it against 13, so its average is the more settled of the two. Written reviews are what separate them: 69% of Big Brain's written reviews are positive against 100% of Eureka's.

Big Brain ships an update weekly, Eureka every 4 days. The most recent releases landed on October 16, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Big Brain | Eureka |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (1.3K ratings)](https://appshunter.io/ios/app/big-brain-ai-homework-helper/id6680155907/reviews)** | [4.5 (13 ratings)](https://appshunter.io/ios/app/eureka-fast-math-solver/id6738960478/reviews) |
| Number of ratings | **1.3K** | 13 |
| Positive reviews | 68.8% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 38 MB | 27 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tom Voitik](https://appshunter.io/developer/1766411564) | [Anastasiia Khovaeva](https://appshunter.io/developer/1716067056) |

## What reviewers say

### Big Brain

[App page](https://appshunter.io/ios/app/big-brain-ai-homework-helper/id6680155907)

Instantly solve homework problems by taking a photo. Get step-by-step explanations and personalized tutoring via chat. Access a history of all your solved problems across multiple math subjects.

**Highlights:** Photo homework scanning, Step-by-step explanations, AI-powered chat tutor, Problem history, Multi-subject math support

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro 1.99 | $1.99 | per 7 days |
| Pro Monthly 4.99 | $4.99 | per month |
| Weekly Pro 6.99 Trial | $6.99 | per 7 days |
| Pro Weekly 6.99 | $6.99 | per 7 days |
| Pro Monthly 9.99 | $9.99 | per month |
| Pro Yearly 29.99 | $29.99 | per year |

**What reviewers like**

- 👍 Easy to use
- 💡 Helpful for classes
- 🚀 Quick responses

**What reviewers complain about**

- 🐛 Occasional bugs
- 💰 Paid subscription required

**Reported bugs**

- Incorrect test results
- Compatibility issues

**Requested features**

- More free features
- Improved accuracy


### Eureka

[App page](https://appshunter.io/ios/app/eureka-fast-math-solver/id6738960478)

This AI-powered tutor offers step-by-step solutions for math, science, and geography problems. It allows users to input questions via typing, snapping a photo, or scanning, providing detailed explanations to foster understanding and boost exam readiness.

**Highlights:** Type, snap, or scan math and science problems, Detailed explanations for complex concepts, Interactive AI tutoring at your own pace, Boost exam readiness with practice solutions, Covers algebra, physics, geography, chemistry, and more

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Eureka Premium access | $0.99 | per 7 days |
| Eureka Premium access | $0.99 | per 7 days |
| Eureka Premium access | $2.99 | per 7 days |
| Eureka Premium access | $4.99 | per 7 days |
| Eureka Premium Access | $7.99 | per 7 days |
| Eureka Premium access | $9.99 | per month |
| Eureka Premium access | $14.99 | per month |
| Eureka Premium access | $39.99 | per year |


## Frequently asked questions

### Is Big Brain free?

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

### Is Eureka free?

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

### Which has better reviews, Big Brain or Eureka?

Big Brain is rated higher. Big Brain averages 4.6 out of 5 from 1.3K ratings, while Eureka averages 4.5 from 13 ratings.

### Do Big Brain or Eureka have ads?

Both Big Brain and Eureka show ads.

### Which is updated more often, Big Brain or Eureka?

Big Brain ships an update weekly, and Eureka every 4 days. Most recently, Big Brain was updated on October 16, 2026 and Eureka on October 4, 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.*