# readbox vs Thư Viện Số

readbox and Thư Viện Số are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. readbox sells 3 in-app purchases, starting at $2.99 per month and Thư Viện Số sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | readbox | Thư Viện Số |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Size | 89 MB | 58 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [VO VAN HUNG](https://appshunter.io/developer/1876861435) | [THU VIEN SO VIETNAM JOINT STOCK COMPANY](https://appshunter.io/developer/1895088262) |

## What reviewers say

### readbox

[App page](https://appshunter.io/ios/app/readbox/id6761289734)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Readbox 1 month | $2.99 | per month |
| Readbox 1 year | $29.99 | per year |
| Readbox lifetime | $69.99 | one-time |


### Thư Viện Số

[App page](https://appshunter.io/ios/app/thu-vien-so-vilib/id6762941828)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Nạp 10,000đ | $0.99 | one-time |
| Nạp 20,000đ | $0.99 | one-time |
| Nạp 50,000đ | $1.99 | one-time |
| Nạp 100,000đ | $2.99 | one-time |


## Frequently asked questions

### Is readbox free?

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

### Is Thư Viện Số free?

Thư Viện Số is free to download, with in-app purchases available.

### Do readbox or Thư Viện Số have ads?

Neither readbox nor Thư Viện Số shows ads.

### Which is updated more often, readbox or Thư Viện Số?

readbox ships an update fortnightly, and Thư Viện Số fortnightly. Most recently, readbox was updated on October 24, 2026 and Thư Viện Số on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*