im Inv vs 数学口算练习
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
im Inv
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Easy Billing Billing Management Program is a company-operated billing tool. Employees can add invoices and quotations to customers through the mobile app. The procedure is simple and easy to use. In addition, all quotations and invoices are stored in the cloud company system.
数学口算练习
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.
- Oral calculation practice
- Addition, subtraction, multiplication, division
- Adjustable difficulty levels
- Engaging game-based learning
- Exquisite graphics and animations
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The baby's mathematical oral calculation exercises have the following characteristics: [Competition] At the same time of the game, carry out mathematics enlightenment to the baby to exercise the baby's quick calculation and oral calculation ability; [Set difficulty] Add, subtract, multiply and divide, from 10 to 100, parents can flexibly set the difficulty according to the child's age and learning situation, and gradually improve the baby's quick calculation ability; [Exquisite picture] The picture design is exquisite and the animation design is smart, which effectively enhances the interest of learning; Mathematics enlightenment, young connection, baby likes, parents must, happy learning, continuous improvement!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | im Inv | 数学口算练习 |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.6 (91 ratings) — better |
| Positive reviews | — | 97.4% of reviews |
| Number of ratings | — | 91 — better |
| Update frequency | Every 5 weeks — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.1 | 10.0 — better |
| Further details — not scored | ||
| Size | 44 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | WCHING TECH LTD CO. LIMITED | 森 袁 |
In-app purchases
im Inv
No in-app purchases
数学口算练习
- 获取完全版本$1.99
