Comparison

TB DualVCF vs Qithesizer

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

Head to head
About

TB DualVCF

This app offers a dual analog filter plug-in for music production, providing a wide range of vintage filter models to shape sound. It features intuitive modulation and envelope followers for creative audio exploration, compatible with AUv3 hosts.

Highlights
  • Dual analog filter sections
  • Dozens of vintage filter models
  • Envelope followers
  • Intuitive modulation editor
  • AUv3 plug-in compatibility
  • Real-time audio processing
Read full description

Dual VCF - the ultimate dynamic filtering AUv3 plug-in! Dual VCF adds motion, shape, and colour. It produces evolving rhythmic movement and complex dynamic filter shapes. It contains dozens of analog filter models with that sought-after sound of the 70s, 80s and 90s. Combined with envelope followers and intuitive modulation editors, it provides almost infinite possibilities for creative aural exploration. Dual VCF features two filter sections, each supporting dozens of low-pass, high-pass and band-pass filter types. Every type is painstakenly modeled after analog filter types found in analog gear, analog synthesizers, and alike, including non-linear filter behavior. Dial in that characterstic 70s, 80s or 90s filter to add some analog flavor to your tracks! Each filter's cut-off frequency and resonance can be sequenced with an intuitive, free-running or beat-synced modulation editor. Seamlessly switch between sine, triangle, noise, or user-defined modulation waveforms. In addition, these parameters can also be modulated with the built-in envelope follower. The ToneBoosters DualVCF app captures the microphone (or external sound card) input and processes the signals in real time. To use it as a plug-in, use an AUv3-compatible host app such as Steinberg Cubasis, Apple Garageband, Audio Evolution Mobile Studio, Auria, AUM, or others. ToneBoosters DualVCF will appear in the list of Audio Unit extensions for effect plug-ins. How to use DualVCF as AUv3 plugin in a host program, start your favourite AUv3 host app (Steinberg Cubasis, Apple Garageband, Audio Evolution Mobile Studio, Auria, AUM, or others) and add TB DualVCF as Audio Unit insert effect to a track or output bus. See below on how to use Audio Units in various host apps. Key features: - The same professional sound as the acclaimed desktop version - Two analog filter sections with dozens of filter designs - Intuitive modulation editor for creative, rhythmic and evolving effects - Undo/redo, and A/B comparison - Color themes for the user interface - Max screen support in Garageband - Optimised for iPad and compatible with iPhone and iPod Touch What you should know: - Licenses acquired for this platform are not compatible with other platforms. - Audio Unit (AUv3) extensions require an iPad mini 2, iPad 4 or later models.

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

Screenshots

TB DualVCF3 screens
Qithesizer4 screens

Verdict

The call

The clearest difference is rating: TB DualVCF at 4.9 against Qithesizer's 4.1. TB DualVCF also leads on price ($4.99 vs $12.99) and iOS requirement (13.0 vs 15.0). Qithesizer's advantage is update cadence (fortnightly vs every 2 months). On review sentiment, 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

TB DualVCF costs $4.99 and Qithesizer $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

TB DualVCF holds the better App Store score, 4.9 against 4.1. Both are backed by a comparable volume of ratings — 18 and 11 respectively. Written reviews point the same way: 80% of TB DualVCF's written reviews are positive against 77% of Qithesizer's.

UpkeepUpdate frequency

TB DualVCF ships an update every 2 months, Qithesizer fortnightly. Both last shipped on October 24, 2026.

Scorecard4 real differences · 6 level
TB DualVCF versus Qithesizer: the parameters behind the verdict, then further details
ParameterTB DualVCFQithesizer
Price$4.99 — better$12.99
Rating4.9 (18 ratings) — better4.1 (11 ratings)
Positive reviews80.0% of reviews — better76.9% of reviews
Number of ratings18 — better11
Update frequencyEvery 2 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size12 MB29 MB
Age rating4+4+
DeveloperToneBoostersRobkoo Information & Technologies Co., Ltd.

Customer experience

TB DualVCF

All ratings18 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews15 reviews
Positive80.0%
Neutral6.7%
Negative13.3%

Qithesizer

All ratings11 ratings
Positive72.7%
Neutral9.1%
Negative18.2%
Written reviews13 reviews
Positive76.9%
Neutral0.0%
Negative23.1%

In-app purchases

None

TB DualVCF

No in-app purchases

None

Qithesizer

No in-app purchases

Questions

Is TB DualVCF free?
TB DualVCF costs $4.99, with no in-app purchases.
Is Qithesizer free?
Qithesizer costs $12.99, with no in-app purchases.
Which has better reviews, TB DualVCF or Qithesizer?
TB DualVCF is rated higher. TB DualVCF averages 4.9 out of 5 from 18 ratings, while Qithesizer averages 4.1 from 11 ratings.
Do TB DualVCF or Qithesizer have ads?
Neither TB DualVCF nor Qithesizer shows ads.
Which is updated more often, TB DualVCF or Qithesizer?
TB DualVCF ships an update every 2 months, and Qithesizer fortnightly. Most recently, TB DualVCF was updated on October 24, 2026 and Qithesizer on October 24, 2026.

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