# 知了 vs Tactile Images READER

The clearest difference is in-app purchases: Tactile Images READER at none against 知了's 10. 知了's advantage is update cadence (every 10 days vs every 4 months) and iOS requirement (9.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. 知了 sells 10 one-off in-app purchases. Tactile Images READER asks for nothing beyond the download.

知了 ships an update every 10 days, Tactile Images READER every 4 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | 知了 | Tactile Images READER |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (2 ratings)](https://appshunter.io/ios/app/tactile-images-reader/id1493969253/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 77.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 4 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 59 MB | 63 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [红雷 于](https://appshunter.io/developer/1507920952) | [Asociatia pentru Dezvoltare Urbana](https://appshunter.io/developer/1493969252) |

## What reviewers say

### 知了

[App page](https://appshunter.io/ios/app/id1382487722)

A comprehensive learning platform designed for visually impaired individuals to acquire knowledge and skills. It aims to empower users to build a better life through accessible educational content.

**Highlights:** Knowledge acquisition, Skill development, Accessible learning environment, Community-driven content, Empowering visually impaired users

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 6知币 | $0.99 | one-time |
| 12个知币 | $1.99 | one-time |
| 18个知币 | $2.99 | one-time |
| 30个知币 | $4.99 | one-time |
| 68个知币 | $9.99 | one-time |
| 88个知币 | $12.99 | one-time |
| 128个知币 | $19.99 | one-time |
| 208个知币 | $30.99 | one-time |
| 388个知币 | $59.99 | one-time |
| 998个知币 | $149.99 | one-time |


### Tactile Images READER

[App page](https://appshunter.io/ios/app/tactile-images-reader/id1493969253)

This educational tool provides audio descriptions for tactile graphics, allowing blind and visually impaired individuals to learn independently. It works with interactive tactile graphics from an e-learning platform, offering a virtual assistant to explain details when a phone is placed over the graphic.

**Highlights:** Audio descriptions for tactile graphics, Virtual assistant for detailed explanations, Supports independent learning, Works with interactive tactile graphics, Customizable descriptions, Multilingual support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 知了 free?

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

### Is Tactile Images READER free?

Tactile Images READER is free to download, with no in-app purchases.

### Do 知了 or Tactile Images READER have ads?

Neither 知了 nor Tactile Images READER shows ads.

### Which is updated more often, 知了 or Tactile Images READER?

知了 ships an update every 10 days, and Tactile Images READER every 4 months. Most recently, 知了 was updated on November 2, 2026 and Tactile Images READER on November 3, 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.*