# Hilda Synthesizer — Complex Oscillator Synth

> Complex oscillator monosynth with analog-style features and MIDI sequencing. (iPhone/iPad app by Bram Bos.)

- Source: https://appshunter.io/ios/app/hilda-synthesizer/id6447191659 (this page in markdown: same URL + `.md`)
- Developer: [Bram Bos](https://appshunter.io/developer/325340444)
- Category: Music
- Price: $12.99
- Rating: 4.90/5 from 57 App Store ratings · 30 written reviews indexed
- Age rating: 4+
- Requires: iOS 12 · 6 MB
- Languages: American English
- Released: 2023-05-04
- Data updated: 2026-08-26
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/hilda-synthesizer/id6447191659/reviews.md

## What is Hilda Synthesizer?

Hilda is a Complex Oscillator Monosynth, inspired by the most interesting aspects of both west-coast and east-coast synthesis techniques. You'll find a wave folder, lowpass gate, and audio-rate modulations, but also a 12-mode filter and traditional VCA circuit. All parts of the instrument are carefully circuit-modelled to sound as analog (or digital, where applicable) as possible. It's like a best-of-all-worlds semi modular synth, but without the patch cables.

The unique mix of different synthesis components adds up to a unique sounding electronic instrument, which can be used as a playable synthesizer, a MIDI sequencer and an audio effect for external audio - or any combination of those three. 

- Full Audio Unit compatibility (AUv3 instrument, audio effect and MIDI processor modes supported)
- Universal design (iPhone and iPad; iPad Air 2 or higher recommended)
- Built-in analog style 16 Step MIDI Sequencer with custom scales
- 12 mode filter, based on the Oberheim Xpander design
- Drone mode lets you [partially] bypass the VCA/LPG and just go with the flow
- DIY Lo-Fi digital delay circuit emulation
- Live pads with effects that can be triggered via the UI (or via exposed AU Parameters)
- All synth settings exposed a AU Parameters (for automation and MIDI learning in your host of choice)
- MIDI Processor plugin mode disables synth to save CPU
- Carefully handcrafted by yours truly, to capture the essence of my love for tinkering and experimenting with sound :-)

Find the user manual on ruismaker.com

## Key features

- Complex Oscillator Monosynth
- Wave folder and lowpass gate
- 12-mode filter
- Circuit-modelled analog sound
- Built-in 16-step MIDI Sequencer
- Audio effect for external audio
- AUv3 compatibility

## Recent user reviews (10 of 30)

All indexed reviews: https://appshunter.io/ios/app/hilda-synthesizer/id6447191659/reviews.md

### 5/5 — Beautiful!

*2025-02-23*

This synth keeps on giving. Automation or manual change of the drone level is one of the many cool things…

### 5/5 — „Einfach“ gut

*2025-02-08*

Mein liebster digitaler Synth. Wild und verstörend 🔈

### 5/5 — Deep and Unique

*2025-01-27*

I held back on getting Hilda because it wasn’t the kind of synth I was used to. Then I bought it, and it was true love, because it wasn’t the kind of synth I was used to, lol. Hilda will reward experimentation with sounds you’re not likely to get anywhere else!

### 5/5 — Magic subconscious creativity

*2024-11-23*

Resisted getting this for a long time, always skeptical of West Cost synthesis. Then they dropped the price and I’m glad I got it. Meditative and relaxing.

### 5/5 — So good

*2024-02-16, version 1.2.2*

Very very nice synth. Would love an A & B patch morphed like the Arturia Polybrute

### 5/5 — Potentiel énorme …incroyable et atypique

*2024-01-03*

Les sonorités sont incroyables et le potentiel créatif est illimité ! Les développeurs ont vraiment eu soucis d’innovation à travers ce synthétiseur. La partie control live performance a été également très bien pensé. Je recommande fortement ce synthétiseur parmi les meilleurs sur iOS ! Foncez vous le regretterez pas un instant

### 5/5 — Bos is a Boss

*2023-11-12*

Dig your apps man.

### 5/5 — Bram’s The Best

*2023-11-12*

Tried and True Developer who cares about his customers and products enough that he even provides free luxury updates. 10/10

### 5/5 — One of the most amazing on iOS

*2023-08-10*

A wonderful mashup of perfectly matched features and amazing sound. I wish I could have a hardware version of this exact synth. Think about it Bram Bos!

### 5/5 — one of the best

*2023-08-04*

i've purchased nearly all Brams apps and not because i needed or wanted them. its because Bram Bos has created a beautiful simplicity that works in all his apps. this allows us all to do the thing we want to do when we open up a drum machine, synth or sequencer. it allows us to
'Play' Music 
cpu friendly, cracking sounds, simple operation and stable fun! worth every penny ; )

## Frequently asked questions about Hilda Synthesizer

### What is Hilda Synthesizer?

Hilda Synthesizer is a complex oscillator monosynth that combines elements of west-coast and east-coast synthesis. It offers features like a wave folder, lowpass gate, a 12-mode filter, and a VCA circuit, all designed to emulate analog or digital sound quality. It can be used as a playable synthesizer, a MIDI sequencer, or an audio effect for external sources.

### What are the key features of Hilda Synthesizer?

Key features include a complex oscillator, wave folder, lowpass gate, a 12-mode filter inspired by the Oberheim Xpander, a built-in 16-step MIDI sequencer with custom scales, and a DIY lo-fi digital delay emulation. It also supports AUv3 compatibility for instrument, audio effect, and MIDI processor modes.

### How much does Hilda Synthesizer cost?

Based on the provided information, the app is a paid application. There are no mentions of in-app purchases or a subscription model, indicating a one-time purchase for the full functionality.

### What devices is Hilda Synthesizer compatible with?

The app features a universal design and is compatible with both iPhone and iPad. However, an iPad Air 2 or higher is recommended for optimal performance due to the complexity of the synthesizer.

### Can Hilda Synthesizer be used with other music software?

Yes, Hilda Synthesizer offers full Audio Unit compatibility (AUv3). This allows it to be used as an instrument, audio effect, or MIDI processor within compatible host applications, with all synth settings exposed as AU Parameters for automation and MIDI learning.

## Version history (last 5 releases)

### 1.3.1 — 2025-03-05

Fixed minor problem when initializing the Space effect on preset load

### 1.3 — 2024-08-24

- Presets can now be imported directly in the Preset Window
- Improved parameter automation handling

### 1.2.2 — 2023-11-17

- rotation (left and right) in the sequencer
- removed phantom-slide at large pitch jumps when glide is set to 0

### 1.2.1 — 2023-11-16

By popular demand: rotation (left and right) in the sequencer!

### 1.2 — 2023-11-11

Hilda pays homage to one of the first experimental synthesizers with a 1970s Music Easel-inspired color theme.

## Apps similar to Hilda Synthesizer

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Synth Pro: Analog Synthesizer](https://appshunter.io/ios/app/synth-pro-analog-synthesizer/id1635988723) | 4.6 (544) | Free | Music |
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## More apps by Bram Bos

- [Ruismaker](https://appshunter.io/ios/app/ruismaker/id1122156899)
- [Ruismaker FM](https://appshunter.io/ios/app/ruismaker-fm/id1143644577)
- [Phasemaker](https://appshunter.io/ios/app/phasemaker/id1161642832)
- [Troublemaker](https://appshunter.io/ios/app/troublemaker/id1180892130)
- [Ripplemaker](https://appshunter.io/ios/app/ripplemaker/id1207806723)
- [Rozeta Sequencer Suite](https://appshunter.io/ios/app/rozeta-sequencer-suite/id1292546479)

All apps by Bram Bos: https://appshunter.io/developer/325340444

## Related topics

[hilda synthesizer](https://appshunter.io/ios/topics/hilda-synthesizer) · [hilda](https://appshunter.io/ios/topics/hilda)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*