# Chordana Viewer vs sumFX

The clearest difference is rating: sumFX at 4.4 against Chordana Viewer's 1.3. sumFX also leads on in-app purchases (none vs 10) and review sentiment (55% vs 25%). Chordana Viewer's advantage is price ($3.99 vs $9.99) and update cadence (every 2 months vs every 6 months). On ads, monetization model, device support and iOS requirement there is nothing between them.

Chordana Viewer costs $3.99 and sumFX $9.99 up front. Chordana Viewer sells 10 one-off in-app purchases. sumFX asks for nothing beyond the download.

sumFX holds the better App Store score, 4.4 against 1.3. Both are backed by a comparable volume of ratings — 3 and 12 respectively. Written reviews point the same way: 25% of Chordana Viewer's written reviews are positive against 55% of sumFX's.

Chordana Viewer ships an update every 2 months, sumFX every 6 months. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Chordana Viewer | sumFX |
| --- | --- | --- |
| Price | **$3.99** | $9.99 |
| Rating | [1.3 (3 ratings)](https://appshunter.io/ios/app/chordana-viewer/id711042441/reviews) | **[4.4 (12 ratings)](https://appshunter.io/ios/app/sumfx/id6450494474/reviews)** |
| Number of ratings | 3 | **12** |
| Positive reviews | 25.0% of reviews | **54.5% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | Paid | Paid |
| Size | 461 MB | 44 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CASIO COMPUTER CO., LTD.](https://appshunter.io/developer/456569836) | [OSC Audio](https://appshunter.io/developer/1693533681) |

## What reviewers say

### Chordana Viewer

[App page](https://appshunter.io/ios/app/chordana-viewer/id711042441)

This application analyzes audio files to automatically generate chord charts for your favorite songs. It displays chords in real-time as the music plays and allows for manual editing and instrument pad playback.

**Highlights:** Automatic chord chart generation, Real-time chord display, Chord editing and manual input, Instrument pad playback, Tempo, key, and vocal balance customization, Email sharing and AirPrint compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CLEAN GUITAR | $0.99 | one-time |
| VA Synth 1 | $0.99 | one-time |
| ROTARY DRAWBAR 1 | $0.99 | one-time |
| XYLOPHONE | $0.99 | one-time |
| VIBRAPHONE | $0.99 | one-time |
| SYNTH STRINGS | $0.99 | one-time |
| SYNTH BRASS | $0.99 | one-time |
| PIANO PAD | $0.99 | one-time |
| STRINGS PIANO | $0.99 | one-time |
| STRINGS | $0.99 | one-time |


### sumFX

[App page](https://appshunter.io/ios/app/sumfx/id6450494474)

This app is a versatile audio effects processor for musicians. It offers a modular design with multiple high-quality FX modules and customizable slots, allowing for quick creation of unique sounds. Focus on your music with intuitive controls and visual feedback.

**Highlights:** Modular multi-FX processor, 8 high-quality FX modules, 8 FX slots with Wet/Dry control, 2 LFOs per slot, 50+ cross-platform presets, Pre/post waveform view

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

**In-app purchases:** none


## Frequently asked questions

### Is Chordana Viewer free?

Chordana Viewer costs $3.99, and also offers in-app purchases.

### Is sumFX free?

sumFX costs $9.99, with no in-app purchases.

### Which has better reviews, Chordana Viewer or sumFX?

sumFX is rated higher. Chordana Viewer averages 1.3 out of 5 from 3 ratings, while sumFX averages 4.4 from 12 ratings.

### Do Chordana Viewer or sumFX have ads?

Neither Chordana Viewer nor sumFX shows ads.

### Which is updated more often, Chordana Viewer or sumFX?

Chordana Viewer ships an update every 2 months, and sumFX every 6 months. Most recently, Chordana Viewer was updated on October 25, 2026 and sumFX on October 24, 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.*