Comparison

Agonizer vs Opera GO

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

Head to head
About

Agonizer

This app is a monophonic synthesizer focused on bass sounds, developed with a synth bass expert. It features dual wavetable oscillators, a mangle section, and built-in stereo effects. It supports MPE controllers and various audio/MIDI connectivity options for standalone or app-to-app use.

Highlights
  • Monophonic synth engine for bass
  • Dual wavetable oscillators
  • Built-in stereo effects
  • MPE controller support
  • Standalone and AUv3 operation
  • 140+ factory presets
Features
Currently charting
Read full description

Agonizer is a monophonic synthesizer designed in collaboration with YouTuber and synth bass expert Jakob Haq of haQ attaQ Overview: * Monophonic Synth Engine with focus on Bass * Built-in stereo effects * 140+ fine tuned factory presets designed by Jakob Haq * Supports ROLI Seaboard and other MPE controllers out of the box * Standalone operation with support for USB audio interfaces, wired, network & bluetooth MIDI * Audio Unit v3 Extension * Inter App Audio support * Audiobus support * Ableton Link Synth Voice: * Dual Wavetable Oscillators with 40+ Wavetables, Morphing & X-Mod * Dedicated sub osc & noise source * Mangle Section with pre-filter Drive, Bitcrush, Lift and Push controls * VA Ladder filter * Wobulator (Highly tweak-able Sequenced LFO) * LFO with Key and BPM Sync * Variable Slope AD & ADSR Envelopes * Tube based master drive Effects: * 2x stereo effect units * Vintage Chorus * Digital Delay Presets: * Factory bank including 140+ presets designed by Jakob Haq * Preset Management with Templates & Categories * Shared User Presets between Standalone and AUv3 versions * Preset Export & Import Connectivity: * Standalone * AUv3 Instrument * Inter-App Audio Instrument * Audiobus Instrument Requirements: * iOS12+ * iPad Air 2 or newer

About

Opera GO

Read full description

The must-have app to fully enjoy the Augmented Reality experience Opera GO through Luxembourg City. The Queen of the Night’s darling operas have escaped and are on the loose in the old town. Use this unique opera catching device to track them down, interact with them and bring them home to the worried Queen. Don’t forget your headphones. Opera GO is a mixed reality Opera created by Anne Simon and Anthime Miller for Volleksbühn. Partners - Kreativstuff, Lucilin, De Gudde Wëllen, CNA, Ecole de Musique Régionale Dudelange With the support of - Filmfund Luxembourg, Oeuvre de Secours Grande Duchesse Charlotte, Ville de Luxembourg, Fondation Indépendance, Ministère de la Culture.

Screenshots

Agonizer4 screens
Opera GO4 screens

Verdict

The call

The clearest difference is price: Opera GO at Free against Agonizer's $7.99. Opera GO also leads on in-app purchases (none vs 3) and update cadence (every 2 weeks vs every 5 months). Agonizer's advantage is chart position (#194 vs unranked). On ads, device support and iOS requirement 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

Opera GO is free to download; Agonizer costs $7.99 up front. Agonizer sells 3 one-off in-app purchases. Opera GO asks for nothing beyond the download.

UpkeepUpdate frequency

Agonizer ships an update every 5 months, Opera GO every 2 weeks. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

Scorecard4 real differences · 7 level
Agonizer versus Opera GO: the parameters behind the verdict, then further details
ParameterAgonizerOpera GO
Price$7.99Free — better
Rating4.8 (203 ratings) — better—
Positive reviews78.0% of reviews—
Number of ratings203 — better—
Update frequencyEvery 5 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
Best chart rank#194 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS11.0 — better12.0
Further details — not scored
Size362 MB177 MB
Age rating4+4+
DeveloperKai ArasVelvet Flare

Bugs and requests

Agonizer

Reported bugs

16 issues
  • Keyboard does not properly handle legato/mono-synth note priority
  • Crashes in Audiobus, AUM, and Cubasis host applications
  • No sound output when used as AUv3 plugin in hosts
  • No sound in GarageBand integration
  • App freezes on splash screen with iOS 18.3
Show 11 more
  • Stuck notes and failed note triggering
  • Scream button malfunction when switching presets
  • Cutoff knob lag in AUv3 scenarios
  • UI jitter and text cutoff on iPhone
  • Favorite preset feature not working on iPhone
  • Program change not working properly in hosts
  • Always opens with init preset in host applications
  • Modulation matrix sensitivity too high (2% movement = large range)
  • Audio output peaks in red with no sound
  • Permanent clipping/damaged audio output
  • Misleading IAP pricing display (showing 'FREE' for paid content)

Requested features

10 requests
  • Polyphony mode or toggle between mono and poly
  • Envelope drawing capability instead of preset selection
  • Menu-based waveform selection instead of cycling
  • Arpeggiator function
  • Preset browser search and favorites filter
Show 5 more
  • Extended automation control for all knobs
  • Keytracking for filter
  • Reverb effect
  • Accelerometer/gyroscopic velocity sensitivity
  • Customizable number of keyboard keys

Opera GO

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Agonizer

One-time3
  • Neon Nightmare Pack$1.99
  • Chrome Oasis Pack$1.99
  • Circuit Bender Pack$1.99
None

Opera GO

No in-app purchases

Questions

Is Agonizer free?
Agonizer costs $7.99, and also offers in-app purchases.
Is Opera GO free?
Opera GO is free to download, with no in-app purchases.
Do Agonizer or Opera GO have ads?
Neither Agonizer nor Opera GO shows ads.
Which is updated more often, Agonizer or Opera GO?
Agonizer ships an update every 5 months, and Opera GO every 2 weeks. Most recently, Agonizer was updated on October 29, 2026 and Opera GO on October 27, 2026.

Other comparisons