Comparison

K7D vs lo

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

Head to head
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

About

lo

This app offers a versatile toolkit for manipulating audio with a variety of lo-fi effects. Explore historical audio degradation, modern digital artifacts, and analog warmth to transform your sound.

Highlights
  • Convolution reverb with unique impulse responses
  • Spectral processing for MP3 simulation and pitch shifting
  • Digital section with bitcrusher and CD stutter
  • Analog section with tape saturation and noise generation
  • Rearrangeable processing sections
  • Dozens of presets for sound warping
Features
Read full description

"LO‑FI‑AF is a very capable lo‑fi toolkit capable of surgically targeted destruction and it could easily find applications in just about any musical genre" -SoundOnSound Unfiltered Audio's lo-fi-af is now available on iOS as a Standalone app or AUv3 plugin! lo-fi-af takes your sound on a journey of artifacts and noise throughout recorded history, from tape warbles and vinyl noise to MP3 chirps and cell phone speaker chatter. lo-fi-af's many sections and versatile algorithms can place your sound in a different decade, or give it a thoroughly modern spin through compound processing. The first section is a convolution reverb preloaded with impulse responses from broken microphones, toy speakers, cell phones, and more. With this section alone, you can place your sound into an entirely different space. The Spectral section then splits your sound into thousands of frequencies before reconstructing it with a twist. Here you can reproduce the sound of a pirated MP3 or pitch shift your signal with clean perfection. Your signal then takes a trip through the digital section. All sorts of hazards are present here, from a skipping CD stutter effect to a multimode bitcrusher. Finally, the rich, colorful analog section adds that vibe that you crave. A maximizer, a tape saturator, a noise generator, an analog-style filter, a pitch warbler, and a radio demodulator all work together in harmony to toss your sound into the past. But wait! That's only one possible signal chain. The Convolution, Spectral, Digital, and Analog sections can be completely rearranged in any order. Dozens of presets will get your started on your sound warping adventure. As an AUv3 plugin, lo-fi-af has been tested to work perfectly with Garageband, Drambo, AUM, Cubasis, Beatmaker, Nanostudio, apeMatrix, Loopy Pro, and more! Additionally, with its clear layout and smart resizing, lo-fi-af can be used on tablets and phones with ease. (Note for Drambo users: Drambo does not yet have automatic Plugin Delay Compensation for managing plugins with latency. As a result, tracks with lo-fi-af will not line up properly with other tracks. An upcoming patch for Drambo will add this feature in.)

Screenshots

K7D2 screens
lo4 screens

Verdict

The call

The clearest difference is rating: lo at 5.0 against K7D's 4.6. lo also leads on update cadence (fortnightly vs every 3 months) and iOS requirement (11.0 vs 17.0). K7D's advantage is price ($3.99 vs $9.99) and review sentiment (80% vs 67%). On ratings volume, ads, in-app purchases and monetization model 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

K7D costs $3.99 and lo $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

lo holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 79 and 29 respectively. Written reviews complicate that: 80% of K7D's written reviews are positive against 67% of lo's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

K7D ships an update every 3 months, lo fortnightly. The most recent releases landed on October 29, 2026 and October 23, 2026 respectively.

Scorecard5 real differences · 5 level
K7D versus lo: the parameters behind the verdict, then further details
ParameterK7Dlo
Price$3.99 — better$9.99
Rating4.6 (79 ratings)5.0 (29 ratings) — better
Positive reviews79.5% of reviews — better66.7% of reviews
Number of ratings79 — better29
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.011.0 — better
Further details — not scored
Size113 MB17 MB
Age rating4+4+
DeveloperImaginando LdaUnfiltered Audio

Customer experience

K7D

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

lo

All ratings29 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Bugs and requests

K7D

Reported bugs

8 issues
  • App crashing with many instruments
  • Project crashes and data loss
  • App not opening after crashes
  • App deleting progress
  • Randomiser not working
Show 3 more
  • App will not load
  • Digital pops and clicks with Audiobus 3
  • Dry signal only in one ear with stereo input

Requested features

9 requests
  • Fix background audio standalone
  • Fix randomiser feature
  • Improve CPU efficiency
  • Make iPad and iPhone versions compatible
  • Add reverse playback option
Show 4 more
  • Allow MIDI assignment for knobs/functions
  • Improve input selection for interfaces
  • Update for Audiobus 3 compatibility
  • Make UI elements larger and more visible

lo

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

K7D

No in-app purchases

None

lo

No in-app purchases

Questions

Is K7D free?
K7D costs $3.99, with no in-app purchases.
Is lo free?
lo costs $9.99, with no in-app purchases.
Which has better reviews, K7D or lo?
lo is rated higher. K7D averages 4.6 out of 5 from 79 ratings, while lo averages 5.0 from 29 ratings.
Do K7D or lo have ads?
Neither K7D nor lo shows ads.
Which is updated more often, K7D or lo?
K7D ships an update every 3 months, and lo fortnightly. Most recently, K7D was updated on October 29, 2026 and lo on October 23, 2026.

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