# Data21 vs USC 35

The clearest difference is in-app purchases: Data21 at none against USC 35's 3. Data21 also leads on update cadence (every 5 days vs every 16 months). USC 35's advantage is iOS requirement (12.0 vs 26.4). On price, ads and device support there is nothing between them.

Both are free to download. USC 35 sells 3 one-off in-app purchases. Data21 asks for nothing beyond the download.

Data21 ships an update every 5 days, USC 35 every 16 months. The most recent releases landed on October 24, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Data21 | USC 35 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/data21/id1350287433/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 16 months |
| Monetization | Free | — |
| Size | 34 MB | 60 MB |
| Requires iOS | 26.4 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Alexandre Alves da Costa](https://appshunter.io/developer/1111954461) | [Lyker Labs LLC](https://appshunter.io/developer/891194494) |

## What reviewers say

### Data21

[App page](https://appshunter.io/ios/app/data21/id1350287433)

This application allows users to anonymously mark and collect important data and feedback about their products and businesses. It's designed to help businesses gather insights for investment, sales, and purchasing decisions.

**Highlights:** Anonymous data collection, Product feedback gathering, Business insights, Investment data support, Sales improvement data, Purchasing optimization data

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

**In-app purchases:** none


### USC 35

[App page](https://appshunter.io/ios/app/usc-35-patents/id1557891192)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| USC Title 35 | $4.99 | one-time |
| USC Title 35 | $12.99 | one-time |
| USC Title 35 | $44.99 | one-time |


## Frequently asked questions

### Is Data21 free?

Data21 is free to download, with no in-app purchases.

### Is USC 35 free?

USC 35 is free to download, with in-app purchases available.

### Do Data21 or USC 35 have ads?

Neither Data21 nor USC 35 shows ads.

### Which is updated more often, Data21 or USC 35?

Data21 ships an update every 5 days, and USC 35 every 16 months. Most recently, Data21 was updated on October 24, 2026 and USC 35 on October 14, 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.*