MIDISpy vs K7D
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MIDISpy
This utility helps monitor MIDI connections across various platforms. It offers basic filtering for different MIDI message types and supports multiple connectivity options.
- Standalone and AUv3 support
- Basic message filtering
- Inter-App MIDI
- USB MIDI
- Bluetooth MIDI
- Network MIDI
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MIDISpy - MIDI Monitor A handy little utility for monitoring MIDI connectivity. Overview: - Standalone and AUv3 support - Basic Filters for Note, Control Change, Clock and SysEx messages Connectivity: - Inter-App MIDI - USB MIDI - Bluetooth MIDI - Network MIDI - AUv3 Requirements: - iOS9+
K7D
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.
- 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
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K7D is a powerful and affordable, vintage tape delay effect plugin for iOS. K7D recreates the hardware echo machines of the past using Imaginando’s signature style of obsessive analog emulation, but with an enhanced level of control from a sleek, modern interface. Using this approach allows a whole new world of creative possibilities, while still retaining a warm, full-bodied analog sound, bursting with character and personality. To give K7D it’s distinctive analog flavour, we studied and analysed the tiny details of what makes classic hardware delays great, and painstakingly recreated every subtle nuance for a fantastically authentic sound. Available as a standalone app and audio unit plugin, you can use it digital audio stations for iOS such as Garage Band, AUM, Cubasis, Auria, Audiobus, etc. Features - 1ms to 1 sec. dual playhead analog modeled delay with noise, tape distortion and mechanical vibration models - Modeled microphone input with pre-amp saturation - Normal and Ping Pong modes - Optimized gain staging and saturation algorithms for very musical results - Delay time spread between heads and stereo width control - High pass and Low pass filter on feedback path - Powerful LFO bipolar time modulation with multiple waveforms (sine, triangular, saw, square, sample and hold and filtered sample and hold) and possibility of inverted LFO phase on second play head (for added stereo imaging) - Delay time syncable with BPM - Possibility of delay time modulation via incoming midi notes - Oscilloscope visualisation of audio waveform and LFO waveform - Built-in patch manager - Audiounit compatible
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | MIDISpy | K7D |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 4.0 (4 ratings) | 4.6 (79 ratings) — better |
| Positive reviews | 71.4% of reviews | 79.5% of reviews — better |
| Number of ratings | 4 | 79 — better |
| Update frequency | Every 3 weeks — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPad | iPhone, iPad — better |
| Requires iOS | 11.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 6 MB | 113 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai Aras | Imaginando Lda |
Customer experience
MIDISpy
K7D
In-app purchases
MIDISpy
No in-app purchases
K7D
No in-app purchases









