# MIDISpy vs K7D

The clearest difference is price: MIDISpy at Free against K7D's $3.99. MIDISpy also leads on update cadence (every 3 weeks vs every 3 months) and iOS requirement (11.0 vs 17.0). K7D's advantage is rating (4.6 vs 4.0) and ratings volume (79 vs 4). On ads, in-app purchases and device support there is nothing between them.

MIDISpy is free to download; K7D costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

K7D holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: K7D has 79 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 71% of MIDISpy's written reviews are positive against 80% of K7D's.

MIDISpy ships an update every 3 weeks, K7D every 3 months. The most recent releases landed on September 30, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | MIDISpy | K7D |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/midispy/id1444652196/reviews) | **[4.6 (79 ratings)](https://appshunter.io/ios/app/k7d-tape-delay/id1460245991/reviews)** |
| Number of ratings | 4 | **79** |
| Positive reviews | 71.4% of reviews | **79.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | **Free** | Paid |
| Size | 6 MB | 113 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Kai Aras](https://appshunter.io/developer/370820899) | [Imaginando Lda](https://appshunter.io/developer/895445015) |

## What reviewers say

### MIDISpy

[App page](https://appshunter.io/ios/app/midispy/id1444652196)

This utility helps monitor MIDI connections across various platforms. It offers basic filtering for different MIDI message types and supports multiple connectivity options.

**Highlights:** Standalone and AUv3 support, Basic message filtering, Inter-App MIDI, USB MIDI, Bluetooth MIDI, Network MIDI

**Features:** macOS Compatibility

**In-app purchases:** none


### K7D

[App page](https://appshunter.io/ios/app/k7d-tape-delay/id1460245991)

This app offers a vintage tape delay effect with analog emulation and modern controls. It recreates classic hardware echo machines for a warm, characterful sound. Use it standalone or as an AUv3 plugin in iOS DAWs.

**Highlights:** Analog modeled dual playhead delay, Modeled microphone input with saturation, Normal and Ping Pong modes, High pass and Low pass feedback filters, Powerful LFO time modulation, BPM syncable delay time, MIDI delay time modulation

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is MIDISpy free?

MIDISpy is free to download, with no in-app purchases.

### Is K7D free?

K7D costs $3.99, with no in-app purchases.

### Which has better reviews, MIDISpy or K7D?

K7D is rated higher. MIDISpy averages 4.0 out of 5 from 4 ratings, while K7D averages 4.6 from 79 ratings.

### Do MIDISpy or K7D have ads?

Neither MIDISpy nor K7D shows ads.

### Which is updated more often, MIDISpy or K7D?

MIDISpy ships an update every 3 weeks, and K7D every 3 months. Most recently, MIDISpy was updated on September 30, 2026 and K7D on October 6, 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.*