# Sullivan+ vs Big Thumb Keyboard

The clearest difference is review sentiment: Sullivan+ at 86% against Big Thumb Keyboard's 0%. Sullivan+ also leads on price (Free vs $2.99) and rating (4.4 vs 1.0). Big Thumb Keyboard's advantage is in-app purchases (none vs 3). On ads, device support and iOS requirement there is nothing between them.

Sullivan+ is free to download; Big Thumb Keyboard costs $2.99 up front. Sullivan+ sells 3 in-app purchases, starting at $9.99 per month. Big Thumb Keyboard asks for nothing beyond the download.

Sullivan+ holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: Sullivan+ has 22 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 86% of Sullivan+'s written reviews are positive against 0% of Big Thumb Keyboard's.

Sullivan+ ships an update every 2 months, Big Thumb Keyboard every 6 months. The most recent releases landed on October 20, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Sullivan+ | Big Thumb Keyboard |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.4 (22 ratings)](https://appshunter.io/ios/app/sullivan-plus/id1475001234/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/big-thumb-keyboard/id6752275284/reviews) |
| Number of ratings | **22** | 1 |
| Positive reviews | **85.7% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | **Free** | Paid |
| Size | 136 MB | 44 MB |
| Requires iOS | **17.6** | 18.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TUAT Inc.](https://appshunter.io/developer/1475001045) | [Bukdu Group, LLC](https://appshunter.io/developer/1838609866) |

## What reviewers say

### Sullivan+

[App page](https://appshunter.io/ios/app/sullivan-plus/id1475001234)

This visual assistance app uses AI and your smartphone camera to describe surroundings, read text, identify faces, and find objects. It offers features like currency recognition and color identification to enhance accessibility for the blind and visually impaired.

**Highlights:** AI object and scene description, Text recognition and reading, Face recognition with age/gender, Object finder with voice guidance, Currency denomination announcement, Color recognition

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $9.99 | per month |
| Pro Usage 5,000 Top-Up | $2.99 | one-time |
| Pro Usage 15,000 Top-Up | $6.99 | one-time |


### Big Thumb Keyboard

[App page](https://appshunter.io/ios/app/big-thumb-keyboard/id6752275284)

This keyboard app uses a unique gesture-based system to allow typing with a single thumb. It offers features like an 8-way swipe system, consistent button size, one-handed mode, phonetic logic, and advanced autocorrect.

**Highlights:** 8-Way Swipe System, Consistent Button Size, True One-Handed Typing, Phonetic Hangul Logic, Pro-Grade Autocorrect, Haptic Feedback, Quick Symbols & Numbers

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

**In-app purchases:** none


## Frequently asked questions

### Is Sullivan+ free?

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

### Is Big Thumb Keyboard free?

Big Thumb Keyboard costs $2.99, with no in-app purchases.

### Which has better reviews, Sullivan+ or Big Thumb Keyboard?

Sullivan+ is rated higher. Sullivan+ averages 4.4 out of 5 from 22 ratings, while Big Thumb Keyboard averages 1.0 from 1 ratings.

### Do Sullivan+ or Big Thumb Keyboard have ads?

Neither Sullivan+ nor Big Thumb Keyboard shows ads.

### Which is updated more often, Sullivan+ or Big Thumb Keyboard?

Sullivan+ ships an update every 2 months, and Big Thumb Keyboard every 6 months. Most recently, Sullivan+ was updated on October 20, 2026 and Big Thumb Keyboard on October 9, 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.*