# Chord vs 投影与视图3D教具

The clearest difference is price: 投影与视图3D教具 at Free against Chord's $3.99. 投影与视图3D教具 also leads on update cadence (every 4 days vs every 4 weeks). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

投影与视图3D教具 is free to download; Chord costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Chord ships an update every 4 weeks, 投影与视图3D教具 every 4 days. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Chord | 投影与视图3D教具 |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.8 (81 ratings)](https://appshunter.io/ios/app/chord/id1500126852/reviews)** | — |
| Number of ratings | **81** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 4 days** |
| Monetization | Paid | — |
| Size | 46 MB | 8 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod, Mac, Apple Watch | **iPhone, iPad, iPod, Mac, Apple Watch, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Sevastyanov](https://appshunter.io/developer/1448837134) | [天添 叶](https://appshunter.io/developer/6799125945) |

## What reviewers say

### Chord

[App page](https://appshunter.io/ios/app/chord/id1500126852)

Unlock musical creativity with a suite of tools for composing and practicing. Generate chord progressions, practice notation, train your ear, and even use your device as a MIDI keyboard. Includes a macOS version for seamless integration.

**Highlights:** Chord progression generation with inversions and extensions, Live playback as piano or synth, MIDI output to macOS, Guitar chord finder, Notation reading practice, Ear training for intervals and voice, macOS version included

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


### 投影与视图3D教具

[App page](https://appshunter.io/ios/app/3d/id6804217452)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Chord free?

Chord costs $3.99, with no in-app purchases.

### Is 投影与视图3D教具 free?

投影与视图3D教具 is free to download, with no in-app purchases.

### Do Chord or 投影与视图3D教具 have ads?

Neither Chord nor 投影与视图3D教具 shows ads.

### Which is updated more often, Chord or 投影与视图3D教具?

Chord ships an update every 4 weeks, and 投影与视图3D教具 every 4 days. Most recently, Chord was updated on October 16, 2026 and 投影与视图3D教具 on October 15, 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.*