# NUSync vs Knowingo

The clearest difference is in-app purchases: NUSync at none against Knowingo's 2. Knowingo's advantage is update cadence (every 2 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Knowingo sells 2 in-app purchases, starting at $2.99 per month. NUSync asks for nothing beyond the download.

NUSync ships an update every 3 weeks, Knowingo every 2 days. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | NUSync | Knowingo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 88 MB | 25 MB |
| Requires iOS | **17.4** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [National University of Singapore](https://appshunter.io/developer/412284566) | [SEMANTIG TECH PTE. LTD](https://appshunter.io/developer/6806904009) |

## What reviewers say

### NUSync

[App page](https://appshunter.io/ios/app/nusync/id6752398974)

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

**In-app purchases:** none


### Knowingo

[App page](https://appshunter.io/ios/app/knowingo-book-summaries/id6806904007)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reading Monthly | $2.99 | per month |
| Reading Annual | $23.99 | per year |


## Frequently asked questions

### Is NUSync free?

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

### Is Knowingo free?

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

### Do NUSync or Knowingo have ads?

Neither NUSync nor Knowingo shows ads.

### Which is updated more often, NUSync or Knowingo?

NUSync ships an update every 3 weeks, and Knowingo every 2 days. Most recently, NUSync was updated on October 24, 2026 and Knowingo on October 26, 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.*