# ChordOne - Chords Toolkit — Finder / Compose / Learn

> Professional chord and scale tool for musicians and learners. (iPhone/iPad app by 炯龙 吴.)

- Source: https://appshunter.io/ios/app/chordone-chords-toolkit/id1211927482 (this page in markdown: same URL + `.md`)
- Developer: [炯龙 吴](https://appshunter.io/developer/596409525)
- Category: Music, Education
- Price: Free with in-app purchases
- Rating: 4.80/5 from 22 App Store ratings · 60 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 116 MB
- Languages: American English, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2017-03-13
- Data updated: 2026-10-17
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/chordone-chords-toolkit/id1211927482/reviews.md

## What is ChordOne?

80,000+ musicians are using this portable chord assistant!

Explore chords, master harmonic rules and spark creative inspiration with intuitive interactive tools.
Look up chords anytime, anywhere, and listen to experience chord colors.
Whether you are a music beginner or professional musician, quickly find chords and improve your harmony skills efficiently.

【App Features】
- Massive Chord Library: Includes 1500+ piano chords, 2500+ guitar fingerings and 1000+ ukulele chord fingerings, covering a wide range of commonly used chords.
- Multi-dimensional Visual Analysis: View chord symbols, component notes, piano key diagrams, fingering charts, chord construction theory, inversions, staff notation and circle of fifths. Go beyond chord shapes and truly understand the underlying logic of harmony.
- Professional Chord Playback: Tap to play chord audio and feel the emotional tone of each chord. Switch between piano / guitar / ukulele. Customize playback speed, playback range and play mode. Built-in reverb and delay effects.
- Build Your Own Chord Progressions: Combine chords freely to create unique harmonic movements. Break free from generic patterns and craft your own musical style!

【Core Functions】
- Chord Lookup: Search by chord type, reverse lookup by keys, text search. Multiple ways to locate chords quickly.
- Modal Chords: Generate diatonic chords for any key, showing chord symbols, component notes and harmonic relationships. Ideal for harmony arrangement, impromptu accompaniment and songwriting.
- Interactive Circle of Fifths: Visualize harmonic relationships. A practical tool for composition, improvisation and music arrangement.
- Chord Progressions: Predefined classic progressions. Create custom chord sequences, export MIDI files for seamless integration with DAWs including GarageBand, Cubase, Logic Pro and more.
- Guitar Chord Library: 100 chord types with over 2500 fingerings.
- Ukulele Chord Library: 100 chord types with over 1000 fingering diagrams.
- Chord Ear Training: Train your ear to recognize chords step by step, from triads to ninth chords.
- Chord Beginner Courses: Beginner-friendly video tutorials covering basic chords all the way to advanced extended chords.

【Chord Types】
Covers beginner to professional-level chords for pop, classical, jazz and other music genres:
Triads, seventh chords, altered seventh chords, sus chords, added tone chords, ninth chords, altered ninth chords, eleventh chords, altered eleventh chords, thirteenth chords, altered thirteenth chords, power chords, major sixth chords, minor sixth chords, six-nine chords, minor six-nine chords, etc.

【Modal Chord Types】
Diatonic triads, diatonic seventh chords, diatonic sus chords, diatonic added tone chords, diatonic extended chords, other diatonic chords, secondary chords, secondary seventh chords, secondary leading tone chords, secondary leading tone seventh chords.

【User Reviews】
“I can quickly check chord tones and train my ear to identify notes in each chord. It helps me solve chord problems easily when playing piano. Convenient and efficient.”
“Finally an app that explains chords so clearly!”
“Perfect for chord lookup while composing scores.”
“Great app, very easy to find chords.”
...

Chord One, explore infinite possibilities of chords.
Terms of Service: [https://179music.com/2019/09/20/Terms_of_Service/](https://179music.com/2019/09/20/Terms_of_Service/)

## Key features

- Vast chord and scale library
- Multi-dimensional visual learning
- Realistic chord/scale listening
- Smart chord lookup and reverse lookup
- Chord progression creation
- Beginner-friendly video courses

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| 月度会员 | $2.99 | per month |
| 年度会员 | $14.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 钢琴指法 | $3.99 | one-time |
| 去除广告 | $3.99 | one-time |
| 解除数量限制 | $0.99 | one-time |
| 自定义和弦 | $0.99 | one-time |
| 更换乐器 | $0.99 | one-time |
| 终身使用 | $40.00 | one-time |


## Is ChordOne safe?

Not enough ratings yet to assess ChordOne.

## Is ChordOne legit?

ChordOne - Chords Toolkit appears to be a legitimate app. The AppsHunter Legitimacy Score for ChordOne is 90 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (10 of 60)

All indexed reviews: https://appshunter.io/ios/app/chordone-chords-toolkit/id1211927482/reviews.md

### 5/5 — 優質的軟體

*2026-06-06, version 3.0.5*

方便、又好用
推！！！

### 5/5 — 免费

*2026-02-13, version 2.2.1*

很好

### 5/5 — 太方便了

*2025-12-25, version 2.1.3*

好讚！

### 5/5 — it‘s a nice app

*2025-11-22, version 2.1.3*

useful to me

### 5/5 — 很好用的軟體

*2025-11-04, version 2.1.3*

好用又簡單的軟體、而且一看就知道怎麼查

### 2/5 — 非常後悔更新😭😭😭

*2025-08-05, version 2.1.2*

我的前一版是高雅美麗的黑色,新版卻變成刺眼的白色且沒有深色介面可以選擇,琴鍵跟字體也大到爆炸好像怕使用者看不見字似的,真的很無語,現在我正在努力尋找降回舊版APP的方法,真的很痛苦😭😭😭

### 5/5 — 實用

*2025-07-24, version 2.1.0*

實用性很高喔

### 1/5 — 一堆廣告付錢

*2025-05-28, version 2.0.3*

冤種可以試

### 5/5 — 非常棒

*2025-05-14, version 2.0.2*

非常棒

### 5/5 — 好用

*2024-12-19, version 2.0.2*

真的不還不錯用

## Frequently asked questions about ChordOne

### What instruments does 和弦助手 support?

和弦助手 supports piano, guitar, and ukulele. It offers specific chord fingerings and learning materials tailored for guitar and ukulele players, alongside general music theory for piano.

### How does 和弦助手 help with learning chords?

和弦助手 provides visual aids like piano key diagrams, staff notation, circle of fifths, and fretboard diagrams. It also includes beginner-friendly video courses covering basic chord knowledge and techniques.

### Can I create and export music with 和弦助手?

Yes, 和弦助手 allows you to create chord progressions, reorder them, and adjust beat counts. You can then export your creations as audio or MIDI files for use in DAWs or for sharing.

### What types of chords and scales are available in 和弦助手?

The app boasts over 100 chord types, including triads, sevenths, suspended, added tone, ninth, eleventh, and thirteenth chords, plus altered chords. It also features over 30 scale types like major/minor, modes, pentatonic, and blues scales.

### Does 和弦助手 offer a free trial for its subscription plans?

The provided data does not specify if a free trial is offered for the monthly or annual membership plans. Users can explore the free features before considering a subscription.

### How often is 和弦助手 updated?

The app was last updated on March 25, 2026, indicating a recent update. Specific update frequency is not detailed, but the latest version suggests ongoing development.

### What are the subscription costs for 和弦助手?

和弦助手 offers a monthly membership for $2.99 and an annual membership for $14.99. These plans likely unlock premium features beyond the free version.

### Is 和弦助手 available on Android devices?

The app is currently listed as supported on iPhone and iPad. Information regarding Android compatibility is not provided in the current data.

## Version history (last 5 releases)

### 3.2.0 — 2026-10-16

This update greatly enhances chord tools. New features include the Composition tab, chord construction formulas and floating piano keyboard, with multi-language switching and sound effect controls.

【Overall Interaction Upgrade】
- Tap the piano keyboard or fingering diagram on any page to preview chord audio
- Chord tones are displayed more prominently for easy viewing
- Different colors distinguish the chord root note from other chord tones
- Visual improvements for mode chord markers for better readability
- Guitar and ukulele chords are now on dedicated pages, no need to switch instruments to view

【Chord Detail Page】
- Added chord construction formulas to view detailed steps for building each chord
- Optimized inverted chord section to clearly show notes and finger positions for all inversions
- Improved fingering panel, displaying both left and right hand fingerings with labeled notes

【Mode Chords】
- Added history floating window to view and play recently browsed chords. Create new chord progressions to explore chord combinations efficiently
- Added type tags to quickly filter different mode chord categories
- Piano keyboard and history are now floating windows that can be manually closed

【Composition】
- The original chord sequence page is now an independent 【Composition】tab
- Built-in classic chord progression templates to quickly start new compositions
- Switch between keys to view corresponding chord progressions
- Tap chords and time values directly on the Composition page for editing
- The piano keyboard at the bottom of the Composition page is converted to a manually closable floating window

【Other Additions & Improvements】
- Added Traditional Chinese and English languages, support in-app language switching
- Added reverb and delay effects for more realistic playback sound
- Interface styling optimized, with support for iPad
- Compatible with iOS 27
- Various minor improvements and bug fixes

### 3.1.1 — 2026-08-12

- 调整应用结构，独立出常用功能，使用更加顺手。
- 优化钢琴键盘的显示，更清晰地显示和弦根音为止。
- 其他优化和问题修复

### 3.1.0 — 2026-07-09

- 优化五度圈和弦，显示调式音级，可直接用于查询调内常用和弦。
- 新增：五度圈和弦通过不同颜色区分三和弦类型
- 新增：五度圈支持查询吉他/尤克里里和弦
- 新增：调式和弦支持查询吉他/尤克里里和弦
- 新增：和弦组合支持和弦转位
- 优化：五度圈默认隐藏七和弦，更简洁
- 优化：调式和弦统一在底部显示乐器对应和弦/指法
- 其他问题修复和优化

### 3.0.5 — 2026-05-08

- 新增五度圈查和弦功能，对照平行大小调功能
- 修复和弦听力部分练习无法进入的问题

### 3.0.4 — 2026-04-13

- 新增搜索功能，快速找到想要的和弦
- 新增常用和弦进行推荐
- 新增和弦识别听觉训练，练习识别各种和弦类型
- 钢琴和弦新增和弦转位功能
- 修复问题和其他优化

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## More apps by 炯龙 吴

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- [SimpNote Lite](https://appshunter.io/ios/app/simpnote-lite/id1272559770)

All apps by 炯龙 吴: https://appshunter.io/developer/596409525

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-17.*