# microTERA vs Sirens' Chor

The clearest difference is rating: microTERA at 4.9 against Sirens' Chor's 4.0. microTERA also leads on update cadence (every 4 months vs every 39 months) and price ($1.99 vs $3.99). Sirens' Chor's advantage is review sentiment (100% vs 81%) and device support (3 vs 1). On ads, in-app purchases, monetization model and iOS requirement there is nothing between them.

microTERA costs $1.99 and Sirens' Chor $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

microTERA holds the better App Store score, 4.9 against 4.0. Both are backed by a comparable volume of ratings — 9 and 2 respectively. Written reviews complicate that: 81% of microTERA's written reviews are positive against 100% of Sirens' Chor's, so the app with the better star average is not the one people write more warmly about.

microTERA ships an update every 4 months, Sirens' Chor every 39 months. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | microTERA | Sirens' Chor |
| --- | --- | --- |
| Price | **$1.99** | $3.99 |
| Rating | **[4.9 (9 ratings)](https://appshunter.io/ios/app/microtera/id819266128/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/sirens-chor-synth-chorus/id1497361812/reviews) |
| Number of ratings | **9** | 2 |
| Positive reviews | 81.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 39 months |
| Monetization | Paid | Paid |
| Size | 24 MB | 11 MB |
| Requires iOS | 11.0 | **10.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Harry Gohs](https://appshunter.io/developer/382428644) | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) |

## What reviewers say

### microTERA

[App page](https://appshunter.io/ios/app/microtera/id819266128)

Explore unique sonic textures with this waveshaping synthesizer. Generate novel sound patches randomly or program them with detailed controls. Includes a variety of built-in effects and advanced sequencing capabilities.

**Highlights:** Waveshaper with user programmable shape, Random sound patch generation, Sequencer with programmable steps, Built-in effects (Chorus, Phaser, Reverb, etc.), Over 150 factory sounds, Audiobus and Ableton Link compatible

**In-app purchases:** none


### Sirens' Chor

[App page](https://appshunter.io/ios/app/sirens-chor-synth-chorus/id1497361812)

This experimental audio effect app analyzes input audio to generate a secondary harmonic voice using sine wave oscillators. The generated voice can be mixed with the original or played solo, creating a chorus effect. It's CPU intensive and operates within a specific frequency range.

**Highlights:** Harmonic analysis of input audio, Sine wave oscillator synthesis, Adjustable chorus effect, Second voice generation, AUV3 plugin support

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is microTERA free?

microTERA costs $1.99, with no in-app purchases.

### Is Sirens' Chor free?

Sirens' Chor costs $3.99, with no in-app purchases.

### Which has better reviews, microTERA or Sirens' Chor?

microTERA is rated higher. microTERA averages 4.9 out of 5 from 9 ratings, while Sirens' Chor averages 4.0 from 2 ratings.

### Do microTERA or Sirens' Chor have ads?

Neither microTERA nor Sirens' Chor shows ads.

### Which is updated more often, microTERA or Sirens' Chor?

microTERA ships an update every 4 months, and Sirens' Chor every 39 months. Most recently, microTERA was updated on November 1, 2026 and Sirens' Chor on November 7, 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.*