# SISSEI Mobile vs ReadMaxx

The clearest difference is in-app purchases: SISSEI Mobile at none against ReadMaxx's 3. SISSEI Mobile also leads on iOS requirement (15.0 vs 18.2). ReadMaxx's advantage is update cadence (every 4 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. ReadMaxx sells 3 in-app purchases, starting at $2.99 per 7 days. SISSEI Mobile asks for nothing beyond the download.

SISSEI Mobile ships an update monthly, ReadMaxx every 4 days. The most recent releases landed on September 29, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | SISSEI Mobile | ReadMaxx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (12 ratings)](https://appshunter.io/ios/app/readmaxx/id6757965441/reviews)** |
| Number of ratings | — | **12** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 176 MB | 288 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sistemas Heuristicos, SA de CV](https://appshunter.io/developer/1597250886) | [MAXX TECHNOLOGIES LIMITED](https://appshunter.io/developer/1374462335) |

## What reviewers say

### SISSEI Mobile

[App page](https://appshunter.io/ios/app/sissei-mobile/id1597250614)

**Features:** macOS Compatibility

**In-app purchases:** none


### ReadMaxx

[App page](https://appshunter.io/ios/app/readmaxx/id6757965441)

This app helps you read faster and more effectively by displaying one word at a time at a controlled pace. It supports various input formats like PDFs, EPUBs, and web links, and includes optional haptic cues to improve focus and comprehension.

**Highlights:** Word-by-word reading display, Adjustable reading speed, Supports PDF, EPUB, web links, and pasted text, Optional haptic cues for structure, Reduces eye movement, Maintains attention and comprehension

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Weekly | $2.99 | per 7 days |
| Unlimited Monthly | $4.99 | per month |
| Unlimited Monthly | $4.99 | per month |


## Frequently asked questions

### Is SISSEI Mobile free?

SISSEI Mobile is free to download, with no in-app purchases.

### Is ReadMaxx free?

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

### Do SISSEI Mobile or ReadMaxx have ads?

Neither SISSEI Mobile nor ReadMaxx shows ads.

### Which is updated more often, SISSEI Mobile or ReadMaxx?

SISSEI Mobile ships an update monthly, and ReadMaxx every 4 days. Most recently, SISSEI Mobile was updated on September 29, 2026 and ReadMaxx on October 5, 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.*