Comparison

Kleverb vs TB DualVCF

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

Head to head
About

Kleverb

This app offers a high-quality algorithmic reverb effect with an intuitive interface. It allows for detailed simulation of various room acoustics and includes features like modulation and a ducker for precise sound shaping. Suitable for diverse musical genres.

Highlights
  • Algorithmic reverb effect
  • Room size selection (SMALL, MEDIUM, LARGE)
  • Selectable filters on reflections
  • Wet signal modulation
  • Damping and diffusion parameters
  • Integrated ducker with sidechain
  • Standalone app and AUv3 plugin
Read full description

Kleverb is a high quality algorithmic reverb effect. An intuitive UI combined with a carefully calibrated network of filters and delays makes this a powerful effect useful in any context; all from acoustic jazz to EDM. With three different room size setups (SMALL, MEDIUM, LARGE), selectable filter on both early and late reflections, modulation, damping, diffusion and much more (see below) almost any kind of room can be simulated. There’s also a ducker included that uses the dry signal as sidechain. Very useful to keep vocals or other solo instruments distinct even when they’re soaking wet. The 64 factory presets covers most of the Kleverb features. Features: • Room size selection. • Filters with selectable type on both early and late reflections. • Wet signal modulation. • Damping filter. • Diffusion and Stereo Spread parameters. • Decay time between 0 and 25 seconds. • Pre delay parameter. • Ducker (compressor), with dry signal as sidechain. • Early / Late signal mix parameter. • Wet and Dry signal level parameters. Full documentation available inside the app or at https://klevgrand.se/download/kleverb-docs/ Kleverb works both as a standalone app and as an AUv3 plugin. Feedback or suggestions? Drop us a line at support(at)klevgrand.se or @klevgrand on Twitter

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.

Screenshots

TB DualVCF3 screens

Verdict

The call

The clearest difference is price: TB DualVCF at $4.99 against Kleverb's $19.99. TB DualVCF also leads on update cadence (every 2 months vs every 4 months) and device support (3 vs 1). On rating, review sentiment, ratings volume and ads 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

Kleverb costs $19.99 and TB DualVCF $4.99 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 4.8. Both are backed by a comparable volume of ratings — 13 and 18 respectively. Written reviews complicate that: 88% of Kleverb's written reviews are positive against 80% of TB DualVCF's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Kleverb ships an update every 4 months, TB DualVCF every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
Kleverb versus TB DualVCF: the parameters behind the verdict, then further details
ParameterKleverbTB DualVCF
Price$19.99$4.99 — better
Rating4.8 (13 ratings)4.9 (18 ratings) — better
Positive reviews87.5% of reviews — better80.0% of reviews
Number of ratings1318 — better
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS13.013.0
Further details — not scored
Size22 MB12 MB
Age rating4+4+
DeveloperKlevgrand Produkter ABToneBoosters

Customer experience

Kleverb

All ratings13 ratings
Positive92.3%
Neutral7.7%
Negative0.0%
Written reviews8 reviews
Positive87.5%
Neutral12.5%
Negative0.0%

TB DualVCF

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

In-app purchases

None

Kleverb

No in-app purchases

None

TB DualVCF

No in-app purchases

Questions

Is Kleverb free?
Kleverb costs $19.99, with no in-app purchases.
Is TB DualVCF free?
TB DualVCF costs $4.99, with no in-app purchases.
Which has better reviews, Kleverb or TB DualVCF?
TB DualVCF is rated higher. Kleverb averages 4.8 out of 5 from 13 ratings, while TB DualVCF averages 4.9 from 18 ratings.
Do Kleverb or TB DualVCF have ads?
Neither Kleverb nor TB DualVCF shows ads.
Which is updated more often, Kleverb or TB DualVCF?
Kleverb ships an update every 4 months, and TB DualVCF every 2 months. Most recently, Kleverb was updated on November 2, 2026 and TB DualVCF on November 3, 2026.

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