# DelayTool vs Solo

The clearest difference is price: DelayTool at $0.99 against Solo's $17.99. DelayTool also leads on in-app purchases (none vs 2) and rating (5.0 vs 4.7). Solo's advantage is update cadence (monthly vs every 23 months) and ratings volume (657 vs 5). On ads and device support there is nothing between them.

DelayTool costs $0.99 and Solo $17.99 up front. Solo sells 2 one-off in-app purchases. DelayTool asks for nothing beyond the download.

DelayTool holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Solo has 657 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 67% of DelayTool's written reviews are positive against 83% of Solo's, so the app with the better star average is not the one people write more warmly about.

DelayTool ships an update every 23 months, Solo monthly. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | DelayTool | Solo |
| --- | --- | --- |
| Price | **$0.99** | $17.99 |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/delaytool-bpm-calculator/id982070192/reviews)** | [4.7 (657 ratings)](https://appshunter.io/ios/app/solo-fretboard-visualization/id1537057699/reviews) |
| Number of ratings | 5 | **657** |
| Positive reviews | 66.7% of reviews | **83.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | — | **#79** |
| Size | 5 MB | 231 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Joel Perry](https://appshunter.io/developer/972887837) | [Trio Software Ltd](https://appshunter.io/developer/1537057701) |

## What reviewers say

### DelayTool

[App page](https://appshunter.io/ios/app/delaytool-bpm-calculator/id982070192)

This application helps musicians and sound engineers calculate precise timing values for musical subdivisions. It automatically updates a table of milliseconds and Hertz based on the entered tempo, ideal for setting up delays and oscillators.

**Highlights:** BPM calculator, Tempo input and tap tempo, Automatic table updates, Calculates milliseconds and Hertz, Supports common musical subdivisions, Precise delay and oscillator setup

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

**In-app purchases:** none


### Solo

[App page](https://appshunter.io/ios/app/solo-fretboard-visualization/id1537057699)

**Currently charting:** #79 Top Paid · Music (US App Store)

Master your guitar fretboard with this interactive trainer. Learn note names, intervals, chord changes, and scales through guided exercises. Designed by professional guitarists, it offers customizable workouts for all skill levels.

**Highlights:** Fretboard visualization, Note name trainer, Interval shape memorization, Chord change outlining, Scale practice, Interactive fretboards, Customizable workouts

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Custom Tunings | $1.99 | one-time |
| Custom Chord Progressions | $5.99 | one-time |

**What reviewers like**

- 🚀 Excellent practice tool
- 👍 Helps improve fretboard knowledge
- 👍 Versatile and configurable
- 👍 Detailed video tutorials
- 👍 Accurate note detection

**What reviewers complain about**

- 🐛 Note detection issues
- 🐛 App crashes
- 🐛 Lack of customization options
- 🐛 Unintuitive for beginners
- 🐛 Limited functionality for the price

**Reported bugs**

- Crashes when launching the app
- Inconsistent note detection
- Inability to save progress or settings

**Requested features**

- Add ability to create custom chord progressions
- Integrate metronome functionality
- Provide visual representation of intervals on staff
- Add option to practice natural notes only
- Implement option to hear chord tones in the background


## Frequently asked questions

### Is DelayTool free?

DelayTool costs $0.99, with no in-app purchases.

### Is Solo free?

Solo costs $17.99, and also offers in-app purchases.

### Which has better reviews, DelayTool or Solo?

DelayTool is rated higher. DelayTool averages 5.0 out of 5 from 5 ratings, while Solo averages 4.7 from 657 ratings.

### Do DelayTool or Solo have ads?

Neither DelayTool nor Solo shows ads.

### Which is updated more often, DelayTool or Solo?

DelayTool ships an update every 23 months, and Solo monthly. Most recently, DelayTool was updated on October 24, 2026 and Solo on October 27, 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.*