Comparison

Devil Spring Reverb vs VAPolyMkII

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
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

VAPolyMkII

This virtual analog synthesizer offers a 16-voice bitimbral polyphonic sound engine with two distinct filter models and extensive modulation options. It includes a built-in sequencer, various effects, and supports AudioUnit Extension for integration with DAWs. Projects can be synced across iPhone, iPad, and Mac via iCloud.

Highlights
  • 16-voice bitimbral polyphonic synthesizer
  • Two analog-modeled filter types
  • Extensive modulation capabilities
  • Built-in piano roll sequencer
  • Multiple audio effects
  • AudioUnit Extension (AUv3) support
  • iCloud Drive project syncing
Features
Read full description

VAPolyMkII is a virtual analog bitimbral polyphonic synthesizer for iPhone, iPad and Mac. It features 16 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 synthesizer consists of two 8 voice 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 the Sallen-Key filter circuit and cascaded OTA 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 16 voice bitimbral polyphonic synthesizer Two type of Lowpass filter, cascaded OTA model and Sallen-key model. Patch points for modulation. Support MIDI 2.0 New 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. - 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.

Screenshots

Devil Spring Reverb2 screens
VAPolyMkII4 screens

Verdict

The call

The clearest difference is price: Devil Spring Reverb at $3.99 against VAPolyMkII's $14.99. Devil Spring Reverb also leads on iOS requirement (11.0 vs 16.6). VAPolyMkII's advantage is update cadence (weekly vs every 5 months) and review sentiment (67% vs 50%). On rating, ratings volume, ads and in-app purchases 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 VAPolyMkII $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.4 for Devil Spring Reverb against 4.5 for VAPolyMkII. Both are backed by a comparable volume of ratings — 7 and 11 respectively. Written reviews are what separate them: 50% of Devil Spring Reverb's written reviews are positive against 67% of VAPolyMkII's.

UpkeepUpdate frequency

Devil Spring Reverb ships an update every 5 months, VAPolyMkII weekly. The most recent releases landed on July 16, 2026 and September 20, 2026 respectively.

Scorecard4 real differences · 6 level
Devil Spring Reverb versus VAPolyMkII: the parameters behind the verdict, then further details
ParameterDevil Spring ReverbVAPolyMkII
Price$3.99 — better$14.99
Rating4.4 (7 ratings)4.5 (11 ratings) — better
Positive reviews50.0% of reviews66.7% of reviews — better
Number of ratings711 — better
Update frequencyEvery 5 monthsWeekly — better
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 ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews6 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

VAPolyMkII

All ratings11 ratings
Positive90.9%
Neutral0.0%
Negative9.1%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

None

Devil Spring Reverb

No in-app purchases

None

VAPolyMkII

No in-app purchases

Questions

Is Devil Spring Reverb free?
Devil Spring Reverb costs $3.99, with no in-app purchases.
Is VAPolyMkII free?
VAPolyMkII costs $14.99, with no in-app purchases.
Which has better reviews, Devil Spring Reverb or VAPolyMkII?
VAPolyMkII is rated higher. Devil Spring Reverb averages 4.4 out of 5 from 7 ratings, while VAPolyMkII averages 4.5 from 11 ratings.
Do Devil Spring Reverb or VAPolyMkII have ads?
Neither Devil Spring Reverb nor VAPolyMkII shows ads.
Which is updated more often, Devil Spring Reverb or VAPolyMkII?
Devil Spring Reverb ships an update every 5 months, and VAPolyMkII weekly. Most recently, Devil Spring Reverb was updated on July 16, 2026 and VAPolyMkII on September 20, 2026.

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