# SPL Graph vs Midiflow Channels (Audiobus)

The clearest difference is rating: SPL Graph at 3.7 against Midiflow Channels (Audiobus)'s 3.0. SPL Graph also leads on review sentiment (64% vs 25%) and update cadence (every 6 months vs every 12 months). Midiflow Channels (Audiobus)'s advantage is price ($1.99 vs $9.99) and in-app purchases (none vs 5). On ratings volume, ads, monetization model and device support there is nothing between them.

SPL Graph costs $9.99 and Midiflow Channels (Audiobus) $1.99 up front. SPL Graph sells 5 in-app purchases, starting at $19.99 per month. Midiflow Channels (Audiobus) asks for nothing beyond the download.

SPL Graph holds the better App Store score, 3.7 against 3.0. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews point the same way: 64% of SPL Graph's written reviews are positive against 25% of Midiflow Channels (Audiobus)'s.

SPL Graph ships an update every 6 months, Midiflow Channels (Audiobus) every 12 months. The most recent releases landed on October 31, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | SPL Graph | Midiflow Channels (Audiobus) |
| --- | --- | --- |
| Price | $9.99 | **$1.99** |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/spl-graph/id307451201/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/midiflow-channels-audiobus/id1224840760/reviews) |
| Number of ratings | **3** | 2 |
| Positive reviews | **64.3% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 12 months |
| Monetization | Paid | Paid |
| Size | 30 MB | 5 MB |
| Requires iOS | 15.0 | **10.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andrew Smith](https://appshunter.io/developer/291822462) | [Johannes Doerr](https://appshunter.io/developer/622204117) |

## What reviewers say

### SPL Graph

[App page](https://appshunter.io/ios/app/spl-graph/id307451201)

This app analyzes sound pressure levels and environmental noise in real-time. It logs audio, captures video, and performs frequency analysis, with options for advanced octave band analysis and professional microphone integration. Receive email notifications for exceeding noise limits and auto-save data for continuous monitoring.

**Highlights:** Real-time sound pressure level analysis, Audio recording and playback, Optional video capture, Octave and 1/3 octave band analysis, 3D frequency plot, Ln SPL value calculation, Email notifications for noise limits

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remote Noise Monitoring | $19.99 | per month |
| Remote Noise Mid Level | $79.99 | per month |
| Remote Noise Large | $149.99 | per month |
| Octave Band SPL Logging | $9.99 | one-time |
| Video Capture Option | $19.99 | one-time |


### Midiflow Channels (Audiobus)

[App page](https://appshunter.io/ios/app/midiflow-channels-audiobus/id1224840760)

This music app acts as a MIDI effect for Audiobus 3, enabling users to filter and remap MIDI messages across specific channels. It allows for granular control over MIDI data flow within your audio setup.

**Highlights:** Filter MIDI messages by channel, Remap MIDI channels, Use multiple instances, Integrates with Audiobus 3

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

**In-app purchases:** none


## Frequently asked questions

### Is SPL Graph free?

SPL Graph costs $9.99, and also offers in-app purchases.

### Is Midiflow Channels (Audiobus) free?

Midiflow Channels (Audiobus) costs $1.99, with no in-app purchases.

### Which has better reviews, SPL Graph or Midiflow Channels (Audiobus)?

SPL Graph is rated higher. SPL Graph averages 3.7 out of 5 from 3 ratings, while Midiflow Channels (Audiobus) averages 3.0 from 2 ratings.

### Do SPL Graph or Midiflow Channels (Audiobus) have ads?

Neither SPL Graph nor Midiflow Channels (Audiobus) shows ads.

### Which is updated more often, SPL Graph or Midiflow Channels (Audiobus)?

SPL Graph ships an update every 6 months, and Midiflow Channels (Audiobus) every 12 months. Most recently, SPL Graph was updated on October 31, 2026 and Midiflow Channels (Audiobus) on November 2, 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.*