# UDS vs Ai Study

The clearest difference is review sentiment: UDS at 100% against Ai Study's 0%. UDS also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (8.1 vs 10.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UDS ships an update every 3 weeks, Ai Study every 2 months. The most recent releases landed on August 13, 2026 and August 24, 2026 respectively.

## The numbers

| Metric | UDS | Ai Study |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (4 ratings)](https://appshunter.io/ios/app/uds/id400421308/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 59 MB | 5 MB |
| Requires iOS | **8.1** | 10.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sand Apps Inc.](https://appshunter.io/developer/333188389) | [Vson Technology Co., Ltd](https://appshunter.io/developer/938010223) |

## What reviewers say

### UDS

[App page](https://appshunter.io/ios/app/uds/id400421308)

This application offers registered users access to specific information related to UDS. It serves as a portal for retrieving and viewing data within the UDS system.

**Highlights:** Access UDS information, For registered users, Information retrieval

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

**In-app purchases:** none


### Ai Study

[App page](https://appshunter.io/ios/app/ai-study/id1631661998)

This tool helps children practice mental arithmetic with smart tracking of progress and performance. It categorizes correct and incorrect answers, monitors time spent, and provides daily topic statistics. A smart alarm clock feature is also included for reminders.

**Highlights:** Summarizes topic records, Classifies correct/wrong answers, Tracks time and correct rate, Monitors daily topics, Smart alarm clock reminder

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

**In-app purchases:** none


## Frequently asked questions

### Is UDS free?

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

### Is Ai Study free?

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

### Do UDS or Ai Study have ads?

Neither UDS nor Ai Study shows ads.

### Which is updated more often, UDS or Ai Study?

UDS ships an update every 3 weeks, and Ai Study every 2 months. Most recently, UDS was updated on August 13, 2026 and Ai Study on August 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.*