# im Inv vs 数学口算练习

The clearest difference is in-app purchases: im Inv at none against 数学口算练习's 1. im Inv also leads on update cadence (every 5 weeks vs every 7 months). 数学口算练习's advantage is iOS requirement (10.0 vs 12.1). On price, ads and device support there is nothing between them.

Both are free to download. 数学口算练习 sells 1 one-off in-app purchase. im Inv asks for nothing beyond the download.

im Inv ships an update every 5 weeks, 数学口算练习 every 7 months. The most recent releases landed on September 20, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | im Inv | 数学口算练习 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (91 ratings)](https://appshunter.io/ios/app/68/id1570086471/reviews)** |
| Number of ratings | — | **91** |
| Positive reviews | — | 97.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 7 months |
| Monetization | — | Free with in-app purchases |
| Size | 44 MB | 31 MB |
| Requires iOS | 12.1 | **10.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [WCHING TECH LTD CO. LIMITED](https://appshunter.io/developer/1344655113) | [森 袁](https://appshunter.io/developer/1345888871) |

## What reviewers say

### im Inv

[App page](https://appshunter.io/ios/app/im-inv/id1531662540)

**Features:** macOS Compatibility

**In-app purchases:** none


### 数学口算练习

[App page](https://appshunter.io/ios/app/68/id1570086471)

This app provides engaging oral math practice for children aged 6-8, focusing on addition, subtraction, multiplication, and division. Parents can adjust difficulty levels to suit their child's learning progress, with an emphasis on building quick calculation and mental math skills through interactive gameplay and appealing visuals.

**Highlights:** Oral calculation practice, Addition, subtraction, multiplication, division, Adjustable difficulty levels, Engaging game-based learning, Exquisite graphics and animations

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 获取完全版本 | $1.99 | one-time |


## Frequently asked questions

### Is im Inv free?

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

### Is 数学口算练习 free?

数学口算练习 is free to download, with in-app purchases available.

### Do im Inv or 数学口算练习 have ads?

Neither im Inv nor 数学口算练习 shows ads.

### Which is updated more often, im Inv or 数学口算练习?

im Inv ships an update every 5 weeks, and 数学口算练习 every 7 months. Most recently, im Inv was updated on September 20, 2026 and 数学口算练习 on October 7, 2026.

---

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