Devil Spring Reverb vs VAMonoMkII
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- AUv3 support
- 38 spring reverb impulse responses
- Optimized convolution engine
- Adjustable tone and reverb length
- Standalone app functionality
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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.
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | Devil Spring Reverb | VAMonoMkII |
|---|---|---|
| Price | $3.99 — better | $14.99 |
| Rating | 4.5 (8 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 50.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 8 — better | 4 |
| Update frequency | Every 5 months — better | Every 11 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, Mac |
| Requires iOS | 11.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 87 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Julien Faure | Ryo Togawa |
Customer experience
Devil Spring Reverb
VAMonoMkII
In-app purchases
Devil Spring Reverb
No in-app purchases
VAMonoMkII
No in-app purchases
Questions
Is Devil Spring Reverb free?
Is VAMonoMkII free?
Which has better reviews, Devil Spring Reverb or VAMonoMkII?
Do Devil Spring Reverb or VAMonoMkII have ads?
Which is updated more often, Devil Spring Reverb or VAMonoMkII?
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