# Core Synth Free

> Monophonic synthesizer app for iPhone and iPod touch with dual oscillators and filter. (iPhone/iPad app by Core Engine Apps.)

- Source: https://appshunter.io/ios/app/core-synth-free/id449078353 (this page in markdown: same URL + `.md`)
- Developer: [Core Engine Apps](https://appshunter.io/developer/382236096)
- Category: Music
- Price: Free with in-app purchases
- Rating: 2.90/5 from 8 App Store ratings · 44 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 7 MB
- Languages: American English
- Released: 2011-07-16
- Data updated: 2026-06-08
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/core-synth-free/id449078353/reviews.md

## What is Core Synth Free?

Get your groove on with Core Synth Free, the definitive monophonic synthesizer for the iPhone and iPod touch. With tons of features packed into a small package, Core Synth is great for live performing.

This free app has the following features:

- 1 Octave keyboard
- Keys light up in different colors when pressed

Oscillator Module
- Dual overlapping oscillators
- Four wave patterns: Square, Triangle, Sawtooth and Reverse Sawtooth
* Select from 5 octaves
* Adjust glide between notes
* Fine tune Oscillator 2 with option to sync with Oscillator 1

Volume Envelope Shaper
- Edit ADSR (Attack, Decay, Sustain, Release)

Low Pass Filter Module
- Adjust Cutoff and Resonance
- Edit ADSR (Attack, Decay, Sustain, Release)

Upgrade to the full version within the app for the following additional features:

- 7 Octave Keyboard
- Octave control to move along entire range

Patches Module
- Save an unlimited number of individually named patches
- Browse through your collection before applying patch
- Delete unwanted patches
- Backup patches via iTunes File Sharing

Modulation Module
- Four wave patterns: Square, Triangle, Sawtooth and Reverse Sawtooth
- Modulate Filter, Pitch or Wave
- Adjust LFO Rate and amount

Arpeggiator Module
- Arpeggio moves up to 5 octaves
- Four step modes: Up, Down, Up/Down, Random
- Adjust rate

Many more exciting enhancements to follow! Core Synth Free includes open source code from MobileSynth developed by Allen Porter.

## Key features

- Dual overlapping oscillators
- Four wave patterns
- Adjustable low pass filter
- ADSR envelope shaping
- 1 octave keyboard
- Save and load patches

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Version Upgrade | $0.99 | one-time |


## Recent user reviews (10 of 44)

All indexed reviews: https://appshunter.io/ios/app/core-synth-free/id449078353/reviews.md

### 5/5 — Simple & Effective

*2021-07-23, version 1.3*

Core Synth does what it promises and reasonably over delivers. Great LFO, resolution, punch and arpeggio. Holds its own in probably most every context. When I get a little sketch in my head, I can punch it out in CS, rig the lightning port of my iPhones and connect to a laptop and enable it as an input in Audio/MIDI Set-up, choose that input from Ableton Live, play out the phrase and loop it or if I’ve made a righteous patch just sample the base note and compose in DAW.

### 5/5 — I made this in to a tornado siren

*2020-12-07, version 1.3*

I used a wireless speaker

### 1/5 — Uh. Latency and loud clicks

*2019-10-18, version 1.3*

Would work great if the audio clicking wasn’t there. just need something simple to do sub synth live at a youth event. Full version worth .99 but nothing more

### 1/5 — Dumb and wasteful

*2019-05-01, version 1.3*

Makes a noise. That’s it. No midi out or in probably. Not even wasting a joke on this.

### 4/5 — Pretty Good Synth App

*2019-02-21, version 1.3*

Bought the full version. Lots of cool features. But it would be cool if you could work on the delayed sound problem. When I touch a key it takes a second before any sound happens and when I play a different key, I have to wait until it starts again. When this happens, I can’t keep a good rhythm going. Please fix this and the app will be perfect.

### 4/5 — Almost perfect basic synth

*2018-12-02, version 1.3*

Just missing pulse width setting for square wave, everything else is there.

### 2/5 — I couldn't get any sound

*2016-01-29, version 1.2*

I have my iphone at max vol but no sound. I don't know if they expect me to pay for it to make sound but I ain't buying anything till I know how it sounds. Too bad too cause this looked kinda neat.

### 4/5 — Review

*2015-10-05, version 1.2*

This synth is fun and has some great sounds. It's only the lack of a recording function that gives it 4 out of 5 stars.

### 1/5 — Terrible latency issues

*2015-03-20, version 1.2*

Takes at least a second to respond, if it responds at all. Could be a decent app if not for this glaring flaw.

### 4/5 — A New Path - Venturesome Fun

*2015-02-22, version 1.2*

As a classical pianist and jammin synthesist, this iOS app enthralls me as its takes "Core Audio", the professional quality of OS power, and audio frameworks come to life for a plethora of sounds.  What is cool here is a solid foundation building on a vision.

What's unfortunate is that it crashes iOS 8.1.3 in an iPad 2, while 2 dozen+ other synth apps don't.  The other eye opener is the classic "freemium" model. One can make sounds and play midi input with the free version (only available one), but has to pay a $0.99 "pro fee" to get to what others rave about and anyone would want to use.

These two items made me turn off iPhone apps on my iPad (still sold and supported for iOS 8).  It also made me wary of what it might do to my iPhone.  I don't want to use a review as a bug report, but encourage the creative and earnest developers to ensure it's a hit everywhere so music apps like this thrive and inspire more. Take advantage of buffer sharing and connecting apps, like AudioCopy.  

Looking forward!  Four stars to 5.

## Frequently asked questions about Core Synth Free

### What is Core Synth Free?

Core Synth Free is a monophonic synthesizer application designed for iPhone and iPod touch. It allows users to create and manipulate sounds using dual oscillators, adjustable filters, and envelope shaping, making it suitable for live performance and music composition.

### What are the key features of Core Synth Free?

The free version includes a 1-octave keyboard, dual overlapping oscillators with four wave patterns, adjustable glide, a volume envelope shaper, and a low-pass filter module with cutoff and resonance controls. You can also save and load patches.

### How much does Core Synth Free cost?

Core Synth Free is available for free. However, it offers in-app purchases to upgrade to the full version, which unlocks additional features such as a 7-octave keyboard, octave control, and advanced modulation and arpeggiator modules.

### What devices is Core Synth Free compatible with?

The app is designed for iPhone and iPod touch. Specific iOS version compatibility is not detailed, but it is intended for these Apple mobile devices.

### What are some common use cases for Core Synth Free?

Users can utilize Core Synth Free for live electronic music performances, experimenting with sound design, creating unique synth lines for tracks, or simply exploring the capabilities of a portable synthesizer on their mobile device.

## Version history (last 4 releases)

### 1.3 — 2017-01-12

This app has been updated by Apple to display the Apple Watch app icon.

iOS 10 Compatibility

### 1.2 — 2012-11-27

- iPhone 5 and iOS 6 compatibility

### 1.1 — 2011-11-03

iOS 5 compatibility

### 1.0 — 2011-07-15

No release notes.

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All apps by Core Engine Apps: https://appshunter.io/developer/382236096

## Related topics

[synth bass](https://appshunter.io/ios/topics/synth-bass) · [core engine apps](https://appshunter.io/ios/topics/core-engine-apps) · [synthmaster](https://appshunter.io/ios/topics/synthmaster) · [synthesizer free](https://appshunter.io/ios/topics/synthesizer-free)

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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 2026-06-08.*