Comparison

Qithesizer vs RX

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

Head to head
About

Qithesizer

This advanced music synthesizer combines virtual analog, wavetable, and physical modeling sound engines. It offers extensive modulation capabilities, a built-in sequencer, and on-screen keyboard for creating complex sounds.

Highlights
  • Multiple sound engines (virtual analog, wavetable, physical modeling)
  • Extensive modulation sources and destinations
  • Full MIDI mapping
  • 16-step sequencer with pattern editor
  • Waveform and dynamic visualizations
  • On-screen keyboard
Features
Read full description

Meet Qithesizer, a powerful multi-engine hybrid software synthesizer. Designed with wind controller in mind, it combines virtual analog, wavetable, and physical modeling in one. 【Features】 ∙ Multiple sound engines: basic waveforms, hundreds of digital waveforms, multiple physical models ∙ 11 modulation sources, 27 modulation destinations ∙ Full midi mapping ∙ 16-step sequencer with powerful pattern editor, save patterns by preset ∙ Waveform and dynamic visualizations ∙ Full-size, on-screen keyboard Our site: www.robkoo.com Facebook Page: @RobkooMusic Twitter: @Robkoo_Music Feedback: cuimingwei@robkoo.com

About

RX

Features
Read full description

Play the wind synth you know with a whole new set of sounds. Warm woodwind tones for a soft ballad, bright synth leads for a bold solo. RX-79 is a breath synthesizer that turns your wind controller and iPhone or iPad into a full sound module. Saxophonist SJsax shaped every sound and every response by actually playing it. [Find the right sound for every song] 41 built-in sounds. 14 acoustic sounds including soprano, alto and baritone sax, clarinet, oboe, flute, trumpet, euphonium and harmonica, and 27 electric sounds including brass, leads and basses. Play the same melody in many different moods. Tap the preview button in the sound list to hear a sound even without a controller. [Fit it to your breath] Adjust breath sensitivity, response curve, attack and decay, and set breath noise, tonguing and note-to-note connection to match your playing style. [Make it your own] Shape each sound with brightness, resonance, drive, vibrato, delay and reverb. Save the settings you like to the USER list and give them names. Saved sounds stay on this device. [SJ PACK: 10 signature sounds, sold separately] Extra sounds that carry SJsax's playing feel. Before buying, you can play each sound yourself for 30 seconds. Note: SJ PACK is an in-app purchase sold separately from the app (one-time purchase). [Connection] Connect a USB MIDI wind controller. RX-79 responds to breath (CC2, CC11, aftertouch), pitch bend and vibrato (CC1). Depending on the ports and power needs of your controller and iPhone or iPad, you may need a separate cable or adapter, such as a USB camera adapter. Sound plays even with the silent switch on, and you can play along with backing tracks from other apps. No internet connection required. No personal data is collected. Connection and support https://sjsax.com/rx79/

Screenshots

Qithesizer4 screens
RX4 screens

Verdict

The call

The clearest difference is in-app purchases: Qithesizer at none against RX's 1. RX's advantage is price ($9.99 vs $12.99). On update cadence, 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

Qithesizer costs $12.99 and RX $9.99 up front. RX sells 1 one-off in-app purchase. Qithesizer asks for nothing beyond the download.

UpkeepUpdate frequency

Qithesizer ships an update fortnightly, RX weekly. The most recent releases landed on October 30, 2026 and October 29, 2026 respectively.

Scorecard2 real differences · 8 level
Qithesizer versus RX: the parameters behind the verdict, then further details
ParameterQithesizerRX
Price$12.99$9.99 — better
Rating4.1 (11 ratings) — better—
Positive reviews76.9% of reviews—
Number of ratings11 — better—
Update frequencyFortnightlyWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size29 MB25 MB
Age rating4+4+
DeveloperRobkoo Information & Technologies Co., Ltd.sung ju KIM

In-app purchases

None

Qithesizer

No in-app purchases

1 purchases

RX

One-time1
  • SJ PACK$5.99

Questions

Is Qithesizer free?
Qithesizer costs $12.99, with no in-app purchases.
Is RX free?
RX costs $9.99, and also offers in-app purchases.
Do Qithesizer or RX have ads?
Neither Qithesizer nor RX shows ads.
Which is updated more often, Qithesizer or RX?
Qithesizer ships an update fortnightly, and RX weekly. Most recently, Qithesizer was updated on October 30, 2026 and RX on October 29, 2026.

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