Comparison

RP vs VAPoly16

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

Head to head
About

RP

This app offers dual stereo delay lines for a vast array of audio effects, from simple echoes to complex soundscapes. It features individual bypass, modulation routing, and tempo synchronization options.

Highlights
  • Dual stereo delay lines
  • High- and Lowpass filters
  • Stereo spread and Looping
  • Separate modulation delay
  • Tempo sync via AudioUnit Host or Ableton Link
  • Delay times from 10ms to 2000ms
Features
Currently charting
Read full description

RP-1 - Dual Digital Delay FX Two separate (stereo) delay lines allow for a wide range of effects ranging from basic slapback and ping-ping type echos to complex modulations and soundscapes. * Overview - Digital Stereo Delay with High- and Lowpass filters, Stereo spread and Looping - Separate modulation Delay for Chorus, Vibrato, Flanger, Panning, Phaser & Tremolo effects - Both sections can be bypassed individually - Mod section can be routed pre or post delay - Delay Times from 10ms to 2000ms (or 1/32 to 2bars) - Tempo Sync via AudioUnit Host or Ableton Link - Tap Temp and Manual Tempo - Normal, Dotted and Triplet - Stereo Spread - Simple 1-Button Looping * Connections - AudioUnitV3 Effect - Inter-App Audio Effect - Audiobus (Filter) - Ableton Link - USB Audio Interface - Microphone

About

VAPoly16

This app is a virtual analog polyphonic synthesizer for iOS and Mac. It offers 16 voices, a sequencer, and various audio effects. It can be used as a standalone application or as an AudioUnit Extension.

Highlights
  • 16 voice virtual analog synthesizer
  • Bitimbral sound design
  • Sequencer with piano roll and automation
  • Multiple audio effects (delay, reverb, chorus, etc.)
  • Standalone and AUv3 extension support
  • Ableton Link and MIDI connectivity
  • Audio file export
Features
Read full description

VAPoly16 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 for classic analog sound. The Effects include delay, chorus, flanger, reverb, eq and compressor. The sequencer features piano roll and 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 Sequencer 16 bar patterns per clip. Total 16 clips. Parameter automation. Audio Export Linear PCM format (AIFF, WAV and CAF) and compressed format (AAC) Support Audio Unit Extension (AUv3) Works on iPhone, iPad and Mac. Support iCloud Drive. Support Ableton Link, Bluetooth MIDI, MIDI In / Out. System Requirements For iOS Devices, A10 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

RP3 screens
VAPoly164 screens

Verdict

The call

The clearest difference is rating: VAPoly16 at 5.0 against RP's 3.9. VAPoly16 also leads on review sentiment (100% vs 70%). RP's advantage is price ($5.99 vs $14.99) and chart position (#200 vs unranked). On ratings volume, update cadence, 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

RP costs $5.99 and VAPoly16 $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

VAPoly16 holds the better App Store score, 5.0 against 3.9. Both are backed by a comparable volume of ratings — 15 and 13 respectively. Written reviews point the same way: 70% of RP's written reviews are positive against 100% of VAPoly16's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on August 26, 2026 and September 20, 2026 respectively.

Scorecard5 real differences · 6 level
RP versus VAPoly16: the parameters behind the verdict, then further details
ParameterRPVAPoly16
Price$5.99 — better$14.99
Rating3.9 (15 ratings)5.0 (13 ratings) — better
Positive reviews70.0% of reviews100.0% of reviews — better
Number of ratings15 — better13
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#200 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS9.0 — better16.4
Further details — not scored
Size13 MB20 MB
Age rating4+4+
DeveloperKai ArasRyo Togawa

Customer experience

RP

All ratings15 ratings
Positive66.7%
Neutral6.7%
Negative26.7%
Written reviews20 reviews
Positive70.0%
Neutral10.0%
Negative20.0%

VAPoly16

All ratings13 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

RP

No in-app purchases

None

VAPoly16

No in-app purchases

Questions

Is RP free?
RP costs $5.99, with no in-app purchases.
Is VAPoly16 free?
VAPoly16 costs $14.99, with no in-app purchases.
Which has better reviews, RP or VAPoly16?
VAPoly16 is rated higher. RP averages 3.9 out of 5 from 15 ratings, while VAPoly16 averages 5.0 from 13 ratings.
Do RP or VAPoly16 have ads?
Neither RP nor VAPoly16 shows ads.
Which is updated more often, RP or VAPoly16?
RP ships an update every 2 months, and VAPoly16 every 2 months. Most recently, RP was updated on August 26, 2026 and VAPoly16 on September 20, 2026.

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