# HCMCOU vs One Piano

The clearest difference is rating: One Piano at 3.0 against HCMCOU's 2.0. HCMCOU's advantage is iOS requirement (11.0 vs 15.0). On price, ratings volume, update cadence and ads there is nothing between them.

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

One Piano holds the better App Store score, 3.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

HCMCOU ships an update every 5 weeks, One Piano monthly. Both last shipped on November 4, 2026.

## The numbers

| Metric | HCMCOU | One Piano |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/hcmcou-elo/id6473704371/reviews) | **[3.0 (2 ratings)](https://appshunter.io/ios/app/one-piano/id6733223665/reviews)** |
| Number of ratings | 1 | **2** |
| Positive reviews | — | 88.9% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Monthly** |
| Monetization | Free | Free |
| Size | 75 MB | 50 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [HO CHI MINH CITY OPEN UNIVERSITY](https://appshunter.io/developer/1479161594) | [DAYONE ASIA](https://appshunter.io/developer/1771354962) |

## What reviewers say

### HCMCOU

[App page](https://appshunter.io/ios/app/hcmcou-elo/id6473704371)

This virtual classroom app streamlines distance learning for students and teachers. It offers access to course materials, assignments, grades, and facilitates communication and assignment submission. Teachers can manage courses, provide feedback, and grade assignments.

**Highlights:** Access course materials, assignments, and grades, Download lecture notes and watch educational videos, Participate in online discussions, Submit assignments electronically, Communicate with students and teachers, Grade assignments and quizzes

**In-app purchases:** none


### One Piano

[App page](https://appshunter.io/ios/app/one-piano/id6733223665)

Manage piano lessons and practice sessions with ease. Schedule classes, track progress, and receive important updates. Parents can monitor their child's learning journey and access electronic communication logs.

**Highlights:** Schedule group and practice lessons, Track learning progress and statistics, Manage registration information, Provide feedback on lessons, QR code check-in and attendance, Update news and events

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

**In-app purchases:** none


## Frequently asked questions

### Is HCMCOU free?

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

### Is One Piano free?

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

### Which has better reviews, HCMCOU or One Piano?

One Piano is rated higher. HCMCOU averages 2.0 out of 5 from 1 ratings, while One Piano averages 3.0 from 2 ratings.

### Do HCMCOU or One Piano have ads?

Neither HCMCOU nor One Piano shows ads.

### Which is updated more often, HCMCOU or One Piano?

HCMCOU ships an update every 5 weeks, and One Piano monthly. Most recently, HCMCOU was updated on November 4, 2026 and One Piano on November 4, 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.*