# Core Synth HD vs RRS Ivoks

The clearest difference is rating: RRS Ivoks at 4.4 against Core Synth HD's 3.4. RRS Ivoks also leads on review sentiment (63% vs 31%) and update cadence (fortnightly vs every 4 months). Core Synth HD's advantage is iOS requirement (8.0 vs 10.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Core Synth HD sells 1 one-off in-app purchase and RRS Ivoks sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

RRS Ivoks holds the better App Store score, 4.4 against 3.4. That said, the two scores are not equally well evidenced: RRS Ivoks has 46 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 31% of Core Synth HD's written reviews are positive against 63% of RRS Ivoks's.

Core Synth HD ships an update every 4 months, RRS Ivoks fortnightly. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Core Synth HD | RRS Ivoks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (5 ratings)](https://appshunter.io/ios/app/core-synth-hd/id446631941/reviews) | **[4.4 (46 ratings)](https://appshunter.io/ios/app/rrs-ivoks/id6443504248/reviews)** |
| Number of ratings | 5 | **46** |
| Positive reviews | 30.6% of reviews | **63.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 10 MB | 19 MB |
| Requires iOS | **8.0** | 10.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Core Engine Apps](https://appshunter.io/developer/382236096) | [RRS, OOO](https://appshunter.io/developer/1486125568) |

## What reviewers say

### Core Synth HD

[App page](https://appshunter.io/ios/app/core-synth-hd/id446631941)

Create music with a powerful monophonic synthesizer for iPad. Explore dual oscillators, customizable filters, and an arpeggiator. Save your custom sounds and enhance your live performances with intuitive controls.

**Highlights:** Dual overlapping oscillators, Four wave patterns, Low Pass Filter with ADSR, Volume Envelope Shaper (ADSR), Arpeggiator with multiple modes, Save unlimited patches

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version Upgrade | $1.99 | one-time |

**What reviewers like**

- 👍 Good for learning basics
- 🎶 Nice retro sound emulation
- 💰 Great value for free/low cost
- 🎹 All controls visible
- 💡 Simple and clear interface

**What reviewers complain about**

- 🔇 No sound issues
- 🔇 Sound stopped working
- 🔇 No sound after purchase
- 🔇 No sound on specific iOS versions
- 🐛 Glitching/microclicks

**Reported bugs**

- No sound on iPad Pro
- No sound on iOS 12
- No sound since last update
- Program doesn't start after update
- Ad blocks view

**Requested features**

- Add MIDI support
- Add Audiobus support
- Add recording with copy/paste
- Add sine wave for sub basses
- Add polyphony option


### RRS Ivoks

[App page](https://appshunter.io/ios/app/rrs-ivoks/id6443504248)

This app emulates analog synthesizers, offering a range of sound shaping tools including oscillators, filters, and amplifiers. It supports AUv3 hosting for integration with music production apps and provides extensive MIDI control.

**Highlights:** Analog Emulation, AUv3 Compatible, Dual Oscillators, Filter Block with ADSR, Amplifier Block with ADSR, Modulation (LFO) Controls, MIDI CC Implementation

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RRS Ivoks Unlimited | $8.99 | one-time |


## Frequently asked questions

### Is Core Synth HD free?

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

### Is RRS Ivoks free?

RRS Ivoks is free to download, with in-app purchases available.

### Which has better reviews, Core Synth HD or RRS Ivoks?

RRS Ivoks is rated higher. Core Synth HD averages 3.4 out of 5 from 5 ratings, while RRS Ivoks averages 4.4 from 46 ratings.

### Do Core Synth HD or RRS Ivoks have ads?

Neither Core Synth HD nor RRS Ivoks shows ads.

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

Core Synth HD ships an update every 4 months, and RRS Ivoks fortnightly. Most recently, Core Synth HD was updated on October 20, 2026 and RRS Ivoks on October 24, 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.*