Hilda Synthesizer vs OUTSIDIFY
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Hilda Synthesizer
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.
- 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
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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
OUTSIDIFY
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.
- Create feedback loops
- Manipulate external sounds
- Use phone as resonant filter
- Capture impulse responses
- Explore real-world acoustics
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Outsidify allows you to manipulate and explore the sounds happening around your smartphone. The microphone and speaker of your phone are hiding exciting potential: create feedback, manipulate resonances, use your mouth as a resonant filter, capture the impulse responses of your coffee cup or the pipe at the construction site you're accidentally passing by. Just have fun. Your imagination is the only limit. Early electronic music was full of exploration of what you can do with just a microphone and speaker. Now it's your time to explore! Go outside and make sounds outside of your phone. What would you Outsidify? Features - create feedbacks from your phone´s microphone and speaker - play sounds from the speaker and influence them with outside conditions - the world is your resonator - capture impulse responses of any space you can fit your phone into - anytime!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Hilda Synthesizer | OUTSIDIFY |
|---|---|---|
| Price | $12.99 | $5.99 — better |
| Rating | 4.9 (58 ratings) | 4.9 (15 ratings) — better |
| Positive reviews | 90.0% of reviews — better | 88.9% of reviews |
| Number of ratings | 58 — better | 15 |
| Update frequency | Every 9 days | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12 — better | 15.2 |
| Further details — not scored | ||
| Size | 6 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Bram Bos | BASTL INSTRUMENTS |
Customer experience
Hilda Synthesizer
OUTSIDIFY
In-app purchases
Hilda Synthesizer
No in-app purchases
OUTSIDIFY
No in-app purchases









