# Undulator vs Mantis

The clearest difference is rating: Mantis at 5.0 against Undulator's 4.3. Undulator's advantage is price ($7.99 vs $14.99) and update cadence (every 2 months vs every 9 months). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Undulator costs $7.99 and Mantis $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Mantis holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 11 and 8 respectively.

Undulator ships an update every 2 months, Mantis every 9 months. The most recent releases landed on September 21, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Undulator | Mantis |
| --- | --- | --- |
| Price | **$7.99** | $14.99 |
| Rating | [4.3 (11 ratings)](https://appshunter.io/ios/app/undulator/id1463822021/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/mantis-bbd-echo/id1673531514/reviews)** |
| Number of ratings | **11** | 8 |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 9 months |
| Monetization | Paid | Paid |
| Size | 16 MB | 10 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Eventide](https://appshunter.io/developer/546518026) | [AudioThing Ltd.](https://appshunter.io/developer/1659941236) |

## What reviewers say

### Undulator

[App page](https://appshunter.io/ios/app/undulator/id1463822021)

This app offers a classic modulated tremolo effect inspired by a renowned hardware processor. It allows musicians to add rhythmic movement, ethereal feedback, and detuned echoes to various instruments and samples, creating evolving soundscapes and dynamic textures.

**Highlights:** Modulated tremolo effect, Ethereal feedback and detuned echoes, AM/FM modulation, Tempo sync, Real-time ribbon control, Multiple modulation waveforms

**In-app purchases:** none


### Mantis

[App page](https://appshunter.io/ios/app/mantis-bbd-echo/id1673531514)

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:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Undulator free?

Undulator costs $7.99, with no in-app purchases.

### Is Mantis free?

Mantis costs $14.99, with no in-app purchases.

### Which has better reviews, Undulator or Mantis?

Mantis is rated higher. Undulator averages 4.3 out of 5 from 11 ratings, while Mantis averages 5.0 from 8 ratings.

### Do Undulator or Mantis have ads?

Neither Undulator nor Mantis shows ads.

### Which is updated more often, Undulator or Mantis?

Undulator ships an update every 2 months, and Mantis every 9 months. Most recently, Undulator was updated on September 21, 2026 and Mantis on September 26, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*