# Partial Difference Subtraction vs LingoAce for Student

The clearest difference is price: LingoAce for Student at Free against Partial Difference Subtraction's $3.99. LingoAce for Student also leads on update cadence (every 3 weeks vs every 9 months) and iOS requirement (13.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

LingoAce for Student is free to download; Partial Difference Subtraction costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Partial Difference Subtraction ships an update every 9 months, LingoAce for Student every 3 weeks. The most recent releases landed on October 8, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Partial Difference Subtraction | LingoAce for Student |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | — | **[3.9 (793 ratings)](https://appshunter.io/ios/app/lingoace-for-student/id1155911183/reviews)** |
| Number of ratings | — | **793** |
| Positive reviews | — | 59.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 278 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Esa Helttula](https://appshunter.io/developer/339440196) | [PPLINGO Pte Ltd](https://appshunter.io/developer/1141645002) |

## What reviewers say

### Partial Difference Subtraction

[App page](https://appshunter.io/ios/app/partial-difference-subtraction/id351023078)

**Features:** macOS Compatibility

**In-app purchases:** none


### LingoAce for Student

[App page](https://appshunter.io/ios/app/lingoace-for-student/id1155911183)

This platform offers live online classes for children aged 3-15 to learn Mandarin Chinese, English, and Math. It connects students with certified teachers for personalized, engaging instruction to build confidence and academic skills.

**Highlights:** Live 1-on-1 and group classes, Certified native-speaking teachers, Curriculum aligned with global standards, Interactive courseware and gamified practice, Personalized learning for all levels, Singapore Math method for logic skills

**In-app purchases:** none

**What reviewers like**

- 👍 Nice and caring teachers
- 🎉 Enjoyable lessons
- 🤝 Friendly teachers
- 🏫 Great for kids
- 🧠 Helps learn Chinese

**What reviewers complain about**

- 🐛 Teachers sometimes go off topic
- 🕰️ Lessons can be boring
- 📚 Homework is too difficult
- 🤖 AI grading issues
- 🤖 Microphone and camera issues

**Reported bugs**

- Frequent app crashes
- Issues with homework submission
- Microphone and camera not working properly
- Inconsistent grading by AI

**Requested features**

- Add shorter class duration option
- Improve homework submission process
- Enhance audio and video quality
- Provide more engaging lesson content


## Frequently asked questions

### Is Partial Difference Subtraction free?

Partial Difference Subtraction costs $3.99, with no in-app purchases.

### Is LingoAce for Student free?

LingoAce for Student is free to download, with no in-app purchases.

### Do Partial Difference Subtraction or LingoAce for Student have ads?

Neither Partial Difference Subtraction nor LingoAce for Student shows ads.

### Which is updated more often, Partial Difference Subtraction or LingoAce for Student?

Partial Difference Subtraction ships an update every 9 months, and LingoAce for Student every 3 weeks. Most recently, Partial Difference Subtraction was updated on October 8, 2026 and LingoAce for Student 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.*