Comparison

MIDISpy vs K7D

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

MIDISpy

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
Read full description

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+

About

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.

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
Read full description

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

K7D2 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
MIDISpy versus K7D: the parameters behind the verdict, then further details
ParameterMIDISpyK7D
PriceFree — better$3.99
Rating4.0 (4 ratings)4.6 (79 ratings) — better
Positive reviews71.4% of reviews79.5% of reviews — better
Number of ratings479 — better
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPadiPhone, iPad — better
Requires iOS11.0 — better17.0
Further details — not scored
Size6 MB113 MB
Age rating4+4+
DeveloperKai ArasImaginando Lda

Customer experience

MIDISpy

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews7 reviews
Positive71.4%
Neutral14.3%
Negative14.3%

K7D

All ratings79 ratings
Positive87.3%
Neutral6.3%
Negative6.3%
Written reviews44 reviews
Positive79.5%
Neutral9.1%
Negative11.4%

In-app purchases

None

MIDISpy

No in-app purchases

None

K7D

No in-app purchases

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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