Comparison

Devil Spring Reverb vs VAMonoMkII

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

Head to head
About

Devil Spring Reverb

This app emulates the sound of a vintage tube amp's spring reverb, offering a warm, analog feel. It utilizes impulse responses and a custom convolution engine for realistic soundscapes, usable as a standalone application or within a DAW.

Highlights
  • AUv3 support
  • 38 spring reverb impulse responses
  • Optimized convolution engine
  • Adjustable tone and reverb length
  • Standalone app functionality
Features
Read full description

Boing Boing makes my old tube amp when I move it or when I wildly unplug my jack! Well now, you just have to move your favorite DAW to hear the evil melody of the wiggling spring. It's vintage and It's very warm. All the sounds come from impulse responses grappled on the web. They've been cleaned up and I've been working on a convolution reverb algorithm optimized with small onions (french expression to said fine tuning). Can be used as standalone app too - AUV3 support - 38 spring reverbs impulse responses selected and cleaned - 3 levels of complexity (low and mid limit the audio bandwidth) - An optimized convolution engine that can go up to 4 seconds - A tone to adjust the brightness of the reverb - A tunable impulse response size (which also plays on the complexity) and a dry / wet mix to be able to go to extreme settings If you hear audio glitches, try to lower quality or decrease the reverb length or increase the buffer length in your daw parameter.

About

VAMonoMkII

This app is a virtual analog bitimbral synthesizer for iOS and macOS. It offers two 8-voice synthesizers with extensive modulation, classic analog filter models, and built-in effects. Create and export music with its sequencer and audio visualization tools.

Highlights
  • Virtual analog bitimbral synthesizer
  • Dual oscillators with variable waveforms
  • Transistor Ladder and Sallen-Key filter models
  • Built-in effects suite (delay, reverb, chorus, etc.)
  • 16-bar sequencer with piano roll and automation
  • Audio Unit Extension (AUv3) support
  • Ableton Link and MIDI 2.0 compatibility
Features
Read full description

VAMonoMkII is a virtual analog bitimbral synthesizer for iPhone, iPad and Mac. It features two 8 voice synthesizer, effects, sequencer and audio visualization tools. It operates as a stand alone or as an AudioUnit Extension (AUv3). Stand Alone supports Ableton Link, MIDI and audio file export. The bitimbral synthesizer consists of two synthesizer, which features two oscillators, two ADSR envelopes, resonant high pass and low pass filter and an amplifier per voice. The oscillators features continuously variable wave shape and wide variety of modulation. The filters are modeled on Transistor Ladder filter circuit and the Sallen-Key filter circuit for classic analog sound. The Effects include delay, chorus, flanger, reverb, eq and compressor. The sequencer features piano roll and parameter automation editor to program 16 bar pattern per clip. Project files can be saved in iCloud Drive, so that the project can be accessed from iPhone, iPad or Mac. - Main Features - Virtual analog bitimbral synthesizer Two type of Lowpass filter, Transistor Ladder model and Sallen-key model. Maximum 8 voice polyphony. it depends on performance of the device it is running. Operate as monophonic or polyphonic. Patch points for modulation. Support MIDI 2.0 User Interface built by SwiftUI for improved performance. Built-in Sequencer. 16 bar patterns per clip. Total 8 clips. Piano Roll and Parameter automation. Support Audio Unit Extension (AUv3) Works on iPhone, iPad and Mac. Support iCloud Drive to share project files between the platforms. Audio Export. Linear PCM format (AIFF, WAV and CAF) and compressed format (AAC) Support Ableton Link, Bluetooth MIDI, MIDI In / Out. 360 bitimbral presets and more. - System Requirements - A13 Fusion or above is recommended. AudioUnit Extension (AUv3) requires host application which support AudioUnit Extension. AudioUnit Extension is supported by Apple Logic and Apple Garage Band on iOS and macOS. For any other DAW, it depends on the application and some of them don’t support AudioUnit Extension. Sound may be distorted if CPU of the device doesn't have enough power. If it happens reduce number of voices.

Screenshots

Devil Spring Reverb2 screens
VAMonoMkII4 screens

Verdict

The call

The clearest difference is review sentiment: Devil Spring Reverb at 50% against VAMonoMkII's 0%. Devil Spring Reverb also leads on price ($3.99 vs $14.99) and update cadence (every 5 months vs every 11 months). VAMonoMkII's advantage is rating (5.0 vs 4.5). 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

Devil Spring Reverb costs $3.99 and VAMonoMkII $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

VAMonoMkII holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 8 and 4 respectively. Written reviews complicate that: 50% of Devil Spring Reverb's written reviews are positive against 0% of VAMonoMkII's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Devil Spring Reverb ships an update every 5 months, VAMonoMkII every 11 months. The most recent releases landed on October 8, 2026 and September 26, 2026 respectively.

Scorecard5 real differences · 5 level
Devil Spring Reverb versus VAMonoMkII: the parameters behind the verdict, then further details
ParameterDevil Spring ReverbVAMonoMkII
Price$3.99 — better$14.99
Rating4.5 (8 ratings)5.0 (4 ratings) — better
Positive reviews50.0% of reviews — better0.0% of reviews
Number of ratings8 — better4
Update frequencyEvery 5 months — betterEvery 11 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, Mac
Requires iOS11.0 — better16.6
Further details — not scored
Size87 MB16 MB
Age rating4+4+
DeveloperJulien FaureRyo Togawa

Customer experience

Devil Spring Reverb

All ratings8 ratings
Positive87.5%
Neutral0.0%
Negative12.5%
Written reviews6 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

VAMonoMkII

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

In-app purchases

None

Devil Spring Reverb

No in-app purchases

None

VAMonoMkII

No in-app purchases

Questions

Is Devil Spring Reverb free?
Devil Spring Reverb costs $3.99, with no in-app purchases.
Is VAMonoMkII free?
VAMonoMkII costs $14.99, with no in-app purchases.
Which has better reviews, Devil Spring Reverb or VAMonoMkII?
VAMonoMkII is rated higher. Devil Spring Reverb averages 4.5 out of 5 from 8 ratings, while VAMonoMkII averages 5.0 from 4 ratings.
Do Devil Spring Reverb or VAMonoMkII have ads?
Neither Devil Spring Reverb nor VAMonoMkII shows ads.
Which is updated more often, Devil Spring Reverb or VAMonoMkII?
Devil Spring Reverb ships an update every 5 months, and VAMonoMkII every 11 months. Most recently, Devil Spring Reverb was updated on October 8, 2026 and VAMonoMkII on September 26, 2026.

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