Comparison

Sirens' Chor vs RedNova

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

Head to head
About

Sirens' Chor

This experimental audio effect app analyzes input audio to generate a secondary harmonic voice using sine wave oscillators. The generated voice can be mixed with the original or played solo, creating a chorus effect. It's CPU intensive and operates within a specific frequency range.

Highlights
  • Harmonic analysis of input audio
  • Sine wave oscillator synthesis
  • Adjustable chorus effect
  • Second voice generation
  • AUV3 plugin support
Features
Read full description

This one is quite experimental and CPU heavy app! While working on my Chord Detector app I came up with the idea to play the found harmonics with sine wave oscillators so I can hear what the algorithm is hearing :) It turns out to be an interesting output that led me to creation of this audio effect app. What happens here is that the input is analysed for main harmonics in the range of 80Hz to 1500Hz. Then a series of sine wave oscillators are set to play those harmonics with the exact frequency and volume and their output is added to create a second voice. This second voice can then be mixed with the input to create some kind of chorus or played alone. All this is CPU heavy process so it should be used with care... Also to make this effect possible I had to use limited range 80Hz to 1500Hz so it is not suitable for every instrument and you have to keep that range in mind when producing. Some very fast volume and frequency changes are applied to the oscillators. The app is AUV3

About

RedNova

This audio plugin offers intelligent compression and spatial positioning for professional sound design. It adapts to your audio, allowing you to control dynamics and place sounds forward for presence or back for warmth. Transform recordings into spatially positioned compositions with intuitive controls.

Highlights
  • Intelligent adaptive compression
  • VCA compressor with analog saturation
  • Forward/back spatial positioning
  • Visual position orb feedback
  • Advanced sidechain control
  • AUv3 plugin format
Features
Read full description

RedNova: Intelligent Compressor + Spatial Positioning Welcome to a new genre of professional audio plugins. RedNova is the first of the Nova series of plugins by Simon Alexander that combines unique and musical audio effects with intuitive forward/back spatial positioning. Intelligent processing adapts to your audio while giving you complete control over effect dynamics and mix placement. From punchy upfront compression to warm distant textures, discover how one brilliantly designed plugin transforms flat or unruly recordings into professionally processed, spatially positioned compositions! Instantly Transform Your Dynamics & Depth: * Intelligent compression that adapts to your source material automatically * Professional VCA compressor with musical saturation and life-like analog circuitry dynamics * Move sounds forward for clarity and presence or back for warmth and space * Watch the position orb grow larger as sounds move forward, smaller as they recede * Advanced sidechain control over compression AND spatial positioning Made for Everyone: * Producers: Get broadcast and album-quality compression with professional spatial control * Beatmakers: Compress drums while positioning elements in mix depth * Singer-Songwriters: Gentle vocal compression to driving saturation with forward positioning for presence * Podcasters: Broadcast-safe compression with spatial separation for voice and music * Beginners: Set-and-forget intelligent processing with simple visual controls * Experts: Advanced sidechain routing with multi-parameter control Professional Features, Intelligently Simple: Intelligent Compressor: 1. Adaptive Processing - Content-aware compression that automatically adjusts to your source material 2. Safety-First Design - Multi-stage limiting ensures broadcast-safe output 3. Musical Response - Professional VCA style compressor with enhanced musical saturation 4. Thread-Safe Architecture - Lock-free processing prevents audio dropouts in demanding sessions SuperSitter Positioning: 1. Forward - Brings sounds closer with intelligent EQ and transient enhancement 2. Back - Creates warm distance with spatial processing and controlled filtering 3. Center - Complete transparency when positioning isn't needed 4. Visual Feedback - Dynamic orb scaling shows exact spatial position Advanced Sidechain Control: 1. Multi-Target Control - Route sidechain to compression threshold, ratio, AND forward/back position 2. Global or Individual - Control all parameters together or individually 3. Self-Signal Mode - Use the track's own signal for dynamic control (DAW dependent) 4. LED Indicators - Color-coded feedback shows which parameters are under sidechain control Technical Excellence: * AUv3 Plugin Format for all iOS/iPadOS DAWs that utilize them * Real-time intelligent content analysis with adaptive processing * CPU-efficient design allows multiple instances without performance issues * Zero-latency processing with automatic phase alignment * Broadcast-safe output limiting with extended dynamic range * Full parameter automation support with smooth transitions * Touch-optimized interface with floating value displays * 20 professionally crafted presets to get you started on any kind of track RedNova represents a new genre of audio plugins combining unique and intelligent audio effects with easy and intuitive spatial positioning. Download RedNova now and hear professional results in seconds! RedNova's intelligent design makes studio and broadcast-quality compression and spatial positioning accessible to everyone.

Screenshots

Sirens' Chor3 screens
RedNova3 screens

Verdict

The call

The clearest difference is rating: RedNova at 5.0 against Sirens' Chor's 4.0. RedNova also leads on update cadence (every 4 weeks vs every 39 months). Sirens' Chor's advantage is price ($3.99 vs $9.99) and iOS requirement (10.0 vs 12.0). 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

Sirens' Chor costs $3.99 and RedNova $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

RedNova holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

UpkeepUpdate frequency

Sirens' Chor ships an update every 39 months, RedNova every 4 weeks. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 6 level
Sirens' Chor versus RedNova: the parameters behind the verdict, then further details
ParameterSirens' ChorRedNova
Price$3.99 — better$9.99
Rating4.0 (2 ratings)5.0 (1 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings2 — better1
Update frequencyEvery 39 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better12.0
Further details — not scored
Size11 MB17 MB
Age rating4+4+
DeveloperAleksandar MlazevSimon Alexander

Customer experience

Sirens' Chor

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

RedNova

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Sirens' Chor

No in-app purchases

None

RedNova

No in-app purchases

Questions

Is Sirens' Chor free?
Sirens' Chor costs $3.99, with no in-app purchases.
Is RedNova free?
RedNova costs $9.99, with no in-app purchases.
Which has better reviews, Sirens' Chor or RedNova?
RedNova is rated higher. Sirens' Chor averages 4.0 out of 5 from 2 ratings, while RedNova averages 5.0 from 1 ratings.
Do Sirens' Chor or RedNova have ads?
Neither Sirens' Chor nor RedNova shows ads.
Which is updated more often, Sirens' Chor or RedNova?
Sirens' Chor ships an update every 39 months, and RedNova every 4 weeks. Most recently, Sirens' Chor was updated on November 7, 2026 and RedNova on October 30, 2026.

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