Comparison

Kleverb vs Mantis

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

Mantis

This audio plugin emulates a vintage 70s analog delay/echo unit, offering a warm, authentic sound. It features four echo taps, swell selectors, and a unique modulation section for chorus-like effects.

Highlights
  • Emulates rare 70s BBD delay/echo
  • Warm analog sound
  • Four echo taps
  • Four swell selectors
  • Rotafaze modulation section
  • Mimics tape echo wow/flutter
  • Chorus-delay effect
Features
Read full description

Mantis is a plugin that emulates a rare BBD (bucket-brigade device) delay/echo unit of the 70s, faithfully recreating its warm and analog sound. Available as AUv3 and Standalone. As the original unit, Mantis features an echo section with four taps and four swell selectors. It also features the rotafaze section, a modulation that can mimic the wow/flutter of a tape echo or turn the unit into a unique chorus-delay.

Screenshots

Mantis1 screens

Verdict

The call

The clearest difference is price: Mantis at $14.99 against Kleverb's $19.99. Mantis also leads on rating (5.0 vs 4.8) and device support (3 vs 1). Kleverb's advantage is update cadence (every 4 months vs every 9 months). 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

Kleverb costs $19.99 and Mantis $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Mantis holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 13 and 8 respectively.

UpkeepUpdate frequency

Kleverb ships an update every 4 months, Mantis every 9 months. The most recent releases landed on September 23, 2026 and October 1, 2026 respectively.

Scorecard4 real differences · 6 level
Kleverb versus Mantis: the parameters behind the verdict, then further details
ParameterKleverbMantis
Price$19.99$14.99 — better
Rating4.8 (13 ratings)5.0 (8 ratings) — better
Positive reviews87.5% of reviews—
Number of ratings13 — better8
Update frequencyEvery 4 months — betterEvery 9 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS13.0 — better14.0
Further details — not scored
Size22 MB10 MB
Age rating4+4+
DeveloperKlevgrand Produkter ABAudioThing Ltd.

Customer experience

Kleverb

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

Mantis

All ratings8 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Kleverb

No in-app purchases

None

Mantis

No in-app purchases

Questions

Is Kleverb free?
Kleverb costs $19.99, with no in-app purchases.
Is Mantis free?
Mantis costs $14.99, with no in-app purchases.
Which has better reviews, Kleverb or Mantis?
Mantis is rated higher. Kleverb averages 4.8 out of 5 from 13 ratings, while Mantis averages 5.0 from 8 ratings.
Do Kleverb or Mantis have ads?
Neither Kleverb nor Mantis shows ads.
Which is updated more often, Kleverb or Mantis?
Kleverb ships an update every 4 months, and Mantis every 9 months. Most recently, Kleverb was updated on September 23, 2026 and Mantis on October 1, 2026.

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