# Hilda Synthesizer vs OUTSIDIFY

The clearest difference is price: OUTSIDIFY at $5.99 against Hilda Synthesizer's $12.99. Hilda Synthesizer's advantage is ratings volume (58 vs 15) and iOS requirement (12 vs 15.2). On rating, review sentiment, update cadence and ads there is nothing between them.

Hilda Synthesizer costs $12.99 and OUTSIDIFY $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Hilda Synthesizer against 4.9 for OUTSIDIFY. Both are backed by a comparable volume of ratings — 58 and 15 respectively. Written reviews are what separate them: 90% of Hilda Synthesizer's written reviews are positive against 89% of OUTSIDIFY's.

Hilda Synthesizer ships an update every 9 days, OUTSIDIFY weekly. Both last shipped on November 3, 2026.

## The numbers

| Metric | Hilda Synthesizer | OUTSIDIFY |
| --- | --- | --- |
| Price | $12.99 | **$5.99** |
| Rating | [4.9 (58 ratings)](https://appshunter.io/ios/app/hilda-synthesizer/id6447191659/reviews) | **[4.9 (15 ratings)](https://appshunter.io/ios/app/outsidify/id6466588903/reviews)** |
| Number of ratings | **58** | 15 |
| Positive reviews | **90.0% of reviews** | 88.9% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | Paid | Paid |
| Size | 6 MB | 8 MB |
| Requires iOS | **12** | 15.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bram Bos](https://appshunter.io/developer/325340444) | [BASTL INSTRUMENTS](https://appshunter.io/developer/1707501258) |

## What reviewers say

### Hilda Synthesizer

[App page](https://appshunter.io/ios/app/hilda-synthesizer/id6447191659)

This app offers a complex oscillator monosynth with a blend of west-coast and east-coast synthesis techniques. It features a wave folder, lowpass gate, 12-mode filter, and VCA circuit, all meticulously circuit-modelled for authentic analog or digital sound. It functions as a playable synth, MIDI sequencer, and audio effect.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases:** none


### OUTSIDIFY

[App page](https://appshunter.io/ios/app/outsidify/id6466588903)

Explore and manipulate ambient sounds using your smartphone's microphone and speaker. Create unique audio effects, capture environmental resonances, and experiment with sound in real-world spaces. Unleash your creativity and discover new sonic possibilities.

**Highlights:** Create feedback loops, Manipulate external sounds, Use phone as resonant filter, Capture impulse responses, Explore real-world acoustics

**In-app purchases:** none


## Frequently asked questions

### Is Hilda Synthesizer free?

Hilda Synthesizer costs $12.99, with no in-app purchases.

### Is OUTSIDIFY free?

OUTSIDIFY costs $5.99, with no in-app purchases.

### Which has better reviews, Hilda Synthesizer or OUTSIDIFY?

OUTSIDIFY is rated higher. Hilda Synthesizer averages 4.9 out of 5 from 58 ratings, while OUTSIDIFY averages 4.9 from 15 ratings.

### Do Hilda Synthesizer or OUTSIDIFY have ads?

Neither Hilda Synthesizer nor OUTSIDIFY shows ads.

### Which is updated more often, Hilda Synthesizer or OUTSIDIFY?

Hilda Synthesizer ships an update every 9 days, and OUTSIDIFY weekly. Most recently, Hilda Synthesizer was updated on November 3, 2026 and OUTSIDIFY on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*