# Math.Brain vs Sign Documents

The clearest difference is ads: Sign Documents at none against Math.Brain's shown. Math.Brain's advantage is update cadence (every 8 days vs monthly) and ratings volume (91 vs 17). On price, rating, in-app purchases and monetization model there is nothing between them.

Both are free to download. Math.Brain sells 6 in-app purchases, starting at $12.99 per 7 days and Sign Documents sells 7 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Sign Documents holds the better App Store score, 4.9 against 4.8. That said, the two scores are not equally well evidenced: Math.Brain has 91 ratings behind it against 17, so its average is the more settled of the two.

Math.Brain ships an update every 8 days, Sign Documents monthly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Math.Brain | Sign Documents |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (91 ratings)](https://appshunter.io/ios/app/mathbrain-ai-homework-helper/id6744367490/reviews) | **[4.9 (17 ratings)](https://appshunter.io/ios/app/sign-documents-signeo/id6751916710/reviews)** |
| Number of ratings | **91** | 17 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 8 days** | Monthly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 33 MB | 33 MB |
| Requires iOS | **16.0** | 16.6 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [COMPREHENSIVE SOLUTIONS FOR DIGITAL MARKETING AND SOFTWARE DEVELOPMENT LIMITED](https://appshunter.io/developer/6776636491) | [Anastasiia Tkachenko](https://appshunter.io/developer/1837909202) |

## What reviewers say

### Math.Brain

[App page](https://appshunter.io/ios/app/mathbrain-ai-homework-helper/id6744367490)

This AI-powered tool simplifies complex subjects like algebra and geometry with step-by-step explanations and instant answers. It adapts to your learning style, offering personalized guidance to help you study smarter and reduce homework stress.

**Highlights:** AI-powered explanations, Step-by-step problem solving, Instant answers, Personalized learning, Smart scanner, AI chat support

**Features:** Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Math.Brain: AI Homework Helper | $12.99 | per 7 days |
| Math.Brain: AI Homework Helper | $12.99 | per 7 days |
| Math.Brain: AI Homework Helper | $14.99 | per month |
| Math.Brain: AI Homework Helper | $15.99 | per month |
| Math.Brain: AI Homework Helper | $83.99 | per year |
| Math.Brain: AI Homework Helper | $99.99 | per year |


### Sign Documents

[App page](https://appshunter.io/ios/app/sign-documents-signeo/id6751916710)

Streamline document signing and form completion directly from your device. Create custom digital signatures, fill out forms without printing, and securely share signed files. Keep all your important documents organized and accessible.

**Highlights:** Legally binding digital signatures, Custom signature creation, Form filling without printing, Secure document storage, Direct sharing of signed documents

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Digital Signature Maker | $2.99 | per 7 days |
| Digital Signature Maker | $4.99 | per 7 days |
| Digital Signature Maker | $6.99 | per 7 days |
| Digital Signature Maker | $9.99 | per 7 days |
| Digital Signature Maker | $19.99 | per year |
| Digital Signature Maker | $29.99 | per year |
| Digital Signature Maker | $39.99 | per year |


## Frequently asked questions

### Is Math.Brain free?

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

### Is Sign Documents free?

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

### Which has better reviews, Math.Brain or Sign Documents?

Sign Documents is rated higher. Math.Brain averages 4.8 out of 5 from 91 ratings, while Sign Documents averages 4.9 from 17 ratings.

### Do Math.Brain or Sign Documents have ads?

Math.Brain shows ads; Sign Documents does not.

### Which is updated more often, Math.Brain or Sign Documents?

Math.Brain ships an update every 8 days, and Sign Documents monthly. Most recently, Math.Brain was updated on October 24, 2026 and Sign Documents 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.*