# Stringflo vs SUS4 Backing Tracks

The clearest difference is update cadence: SUS4 Backing Tracks at fortnightly against Stringflo's every 4 months. SUS4 Backing Tracks also leads on iOS requirement (16.0 vs 18.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Stringflo sells 2 in-app purchases, starting at $0.99 per month and SUS4 Backing Tracks sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Stringflo ships an update every 4 months, SUS4 Backing Tracks fortnightly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Stringflo | SUS4 Backing Tracks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/stringflo/id6740091216/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 45 MB |
| Requires iOS | 18.2 | **16.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Oshry Ben-Harush](https://appshunter.io/developer/1782630805) | [ThePaulSmith](https://appshunter.io/developer/319584506) |

## What reviewers say

### Stringflo

[App page](https://appshunter.io/ios/app/stringflo/id6740091216)

Master the guitar fretboard with interactive note training, real-time pitch detection, and comprehensive theory tools. Practice with customizable challenges, visualize note positions, and track your progress to build fluency and deepen your understanding of the instrument.

**Highlights:** Randomized note challenges, Real-time pitch feedback, Fretboard visualization, Customizable practice sessions, Built-in tuner, Chord and scale theory tools, Progress tracking

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $0.99 | per month |
| Monthly subscription | $0.99 | per month |


### SUS4 Backing Tracks

[App page](https://appshunter.io/ios/app/sus4-backing-tracks-jam-along/id6777230344)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SUS4 Backing Tracks Pro Monthl | $0.99 | per month |
| SUS4 All-Access | $4.99 | per month |
| SUS4 Backing Tracks Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is Stringflo free?

Stringflo is free to download, with in-app purchases available.

### Is SUS4 Backing Tracks free?

SUS4 Backing Tracks is free to download, with in-app purchases available.

### Do Stringflo or SUS4 Backing Tracks have ads?

Neither Stringflo nor SUS4 Backing Tracks shows ads.

### Which is updated more often, Stringflo or SUS4 Backing Tracks?

Stringflo ships an update every 4 months, and SUS4 Backing Tracks fortnightly. Most recently, Stringflo was updated on October 24, 2026 and SUS4 Backing Tracks on October 25, 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.*