# Core Synth Free vs HD

The clearest difference is rating: HD at 5.0 against Core Synth Free's 2.9. HD also leads on in-app purchases (none vs 1). Core Synth Free's advantage is iOS requirement (8.0 vs 13.0). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Core Synth Free sells 1 one-off in-app purchase. HD asks for nothing beyond the download.

HD holds the better App Store score, 5.0 against 2.9. Both are backed by a comparable volume of ratings — 8 and 3 respectively.

Core Synth Free ships an update every 13 months, HD every 10 months. The most recent releases landed on October 20, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Core Synth Free | HD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.9 (8 ratings)](https://appshunter.io/ios/app/core-synth-free/id449078353/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hd-300-assistant/id1526764718/reviews)** |
| Number of ratings | **8** | 3 |
| Positive reviews | 63.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 10 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 7 MB | 76 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Core Engine Apps](https://appshunter.io/developer/382236096) | [Yamaha Corporation](https://appshunter.io/developer/353469356) |

## What reviewers say

### Core Synth Free

[App page](https://appshunter.io/ios/app/core-synth-free/id449078353)

Create music with a monophonic synthesizer featuring dual oscillators, adjustable filters, and envelope shaping. Explore various wave patterns and octaves to craft unique sounds for live performance or composition.

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

**Features:** macOS Compatibility

**In-app purchases (1)**

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


### HD

[App page](https://appshunter.io/ios/app/hd-300-assistant/id1526764718)

This application connects to a specific device via Bluetooth to remotely control musical functions. It allows instructors to guide students with features like metronome operation, tempo setting, and pitch adjustment. It also includes tools for chord detection and tuning.

**Highlights:** Remote HD control (keyboard, metronome, temperament, transposition), Customizable beat and tempo settings, Individual volume and pitch adjustment, Demonstrate mode for pitch and volume feedback, Chord detection and naming, Adjustable tuner, Rhythm assistant

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Core Synth Free free?

Core Synth Free is free to download, with in-app purchases available.

### Is HD free?

HD is free to download, with no in-app purchases.

### Which has better reviews, Core Synth Free or HD?

HD is rated higher. Core Synth Free averages 2.9 out of 5 from 8 ratings, while HD averages 5.0 from 3 ratings.

### Do Core Synth Free or HD have ads?

Neither Core Synth Free nor HD shows ads.

### Which is updated more often, Core Synth Free or HD?

Core Synth Free ships an update every 13 months, and HD every 10 months. Most recently, Core Synth Free was updated on October 20, 2026 and HD on October 6, 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.*