# TST FLY vs YDReader

The clearest difference is in-app purchases: TST FLY at none against YDReader's 2. TST FLY also leads on update cadence (every 3 days vs fortnightly) and iOS requirement (9.0 vs 12.1). On price, ads and device support there is nothing between them.

Both are free to download. YDReader sells 2 one-off in-app purchases. TST FLY asks for nothing beyond the download.

TST FLY ships an update every 3 days, YDReader fortnightly. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | TST FLY | YDReader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (56 ratings)](https://appshunter.io/ios/app/ydreader-epubandmobireader/id1488737276/reviews)** |
| Number of ratings | — | **56** |
| Positive reviews | — | 87.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 4 MB | 37 MB |
| Requires iOS | **9.0** | 12.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [SHENZHEN TOUCHSTONE TECHNOLOGY CO.,LTD](https://appshunter.io/developer/1441759734) | [福中 王](https://appshunter.io/developer/920377229) |

## What reviewers say

### TST FLY

[App page](https://appshunter.io/ios/app/tst-fly/id1441759735)

**Features:** macOS Compatibility

**In-app purchases:** none


### YDReader

[App page](https://appshunter.io/ios/app/ydreader-epubandmobireader/id1488737276)

Read TXT, Epub, MOBi, and AZW3 files with extensive customization options for fonts, colors, and spacing. This app also supports decompression of ZIP, RAR, and 7Z archives, and compression into ZIP and 7z formats.

**Highlights:** Ebook reading (TXT, Epub, MOBi, AZW3), Customizable reading experience, File decompression (ZIP, RAR, 7Z), File compression (ZIP, 7Z)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1元购买100金币 | $0.99 | one-time |
| 18元购买9999金币 | $2.99 | one-time |

**What reviewers like**

- 👍 Very good app
- 👍 Clean and simple
- 👍 Supports various ebook formats
- 👍 Convenient local upload
- 👍 Pure listening app

**What reviewers complain about**

- 🐛 CarPlay audio stuttering
- 🐛 Reading voice is hoarse
- 🐛 Chinese voice options too few
- 🐛 Mandarin pronunciation not standard
- 🐛 Cannot find voice settings

**Reported bugs**

- CarPlay audio stuttering on wired connection
- Reading voice sounds hoarse on new phone
- Reading the same sentence repeatedly
- Skipping sentences or paragraphs
- Highlight position ahead of audio, causing auto-page turn issues

**Requested features**

- Add long-press translation (AI assisted)
- Add email login for multi-platform sync
- Add Siri voice option
- Add Siri voice 3 option
- Add more views on homepage (minimalist, detailed, grid)


## Frequently asked questions

### Is TST FLY free?

TST FLY is free to download, with no in-app purchases.

### Is YDReader free?

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

### Do TST FLY or YDReader have ads?

Neither TST FLY nor YDReader shows ads.

### Which is updated more often, TST FLY or YDReader?

TST FLY ships an update every 3 days, and YDReader fortnightly. Most recently, TST FLY was updated on October 26, 2026 and YDReader 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.*