Hisooth Resonance™ vs Undersong
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Hisooth Resonance™
This app offers a premium music streaming experience focused on vibroacoustic wellness. It provides professional soundscapes for meditation, sleep, recovery, and relaxation, designed for use with specialized wellness equipment.
- Licensed music library
- Therapeutic soundscapes
- Meditation and sleep music
- Exclusive artist content
- Album code activation
- High-quality audio streaming
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Hisooth Resonance: Music Designed to Be Felt Hisooth Resonance is a premium music streaming platform engineered specifically for vibroacoustic wellness. Developed by Hisooth.com with composer Wenwei Wang, this app delivers professional music for meditation, recovery, and immersive relaxation. Unlike standard streaming services, Hisooth Resonance focuses on therapeutic soundscapes optimized for vibroacoustic systems, wellness loungers, therapy beds, and immersive environments. MUSIC COLLECTIONS: - Relaxation: Calming compositions to reduce tension. - Meditation: Mindfulness soundscapes for breathwork. - Sleep: Gentle ambient music for deeper rest. - Healing: Restorative compositions for wellness. - Massage: Professional music for spas and clinics. - Energy: Rhythmic tracks for focus and vitality. - Originals: Exclusive content from independent artists. UNLOCK PREMIUM ALBUMS: Purchasing selected Hisooth hardware grants you exclusive album access codes. Enter your code in the app to unlock full licensed music collections for unlimited streaming. DESIGNED FOR PROFESSIONALS: Perfect for Wellness Centers, Meditation Studios, Sound Therapy Practices, Massage Clinics, Recovery Facilities, and Home Wellness Spaces. KEY FEATURES: * Licensed Music Library * Exclusive Artist Content * Album Code Activation * High-Quality Audio Streaming * Regular New Releases Feel More Than Music. Experience sound through your entire body.
Undersong
This audio effect acts like an instrument, generating synthesized notes in key based on incoming audio. Explore a vast array of sound combinations with various materials, modes, and patterns for unique ambient performances.
- Generates in-key synthesized notes from audio input
- 12 material types and 10 performance modes
- 10 pattern options for sound shaping
- Self-generating ambient pad mode
- Gravity feature for melodic anchoring
- Customizable scales and root notes
- Integrated reverb effect
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Undersong is an AUv3 audio effect that plays along with whatever audio you send it. It's technically an audio effect, but it acts more like an instrument. It's based on an idea I had for a live performance that ended up taking on a life of its own. The short version is that everything Undersong plays comes from the audio coming in. It listens to your track for "action", like a pluck, a drum hit or a swell, and each of those can spawn a particle. A particle is one small synthesized note, often a pluck but not always, and it's always in key. Soft playing gets soft and lower responses, and digging in gets you brighter ones. I feel like Undersong is something that wishes to be the main focus of a composition, but how you use it is totally up to you. I really enjoy using it as the centerpiece of ambient jams with a bit of percussion or a slow moving bassline alongside. If you're not sure where to start, send in a drum loop (even just a series of blips or clicks will work...), turn up the Mix to 100% and just experiment for a while. Twist some knobs and see what you find. You can't break it. The particles can be one of 12 materials, mostly inspired by modular synthesis techniques. Each material can then be performed and shaped by one of 10 modes and 10 patterns. That makes for 1200 combinations before you turn a single dial. One of the modes, Aurora, stops making particles altogether and turns into a self-generating ambient pad that your playing strikes. It's one of my favorite things in the device. I tried to build this like a playground for ambient performances. It's maybe a bit like sitting down at someone else's modular rig... it takes some exploration. I've set up an environment that I think is inspiring and I hope you can find your way around and enjoy it as well. There's various ideas and features hidden throughout (in plain sight) that work nicely together or on their own. Gravity, an idea I brought over from my Augur device, pulls the notes toward your root so the melodies sound like they're actually in your key. With Ear on, Undersong listens for the pitch you're playing and answers in unison, grain plays tiny pieces of your own audio back as notes, and Input lets little glimpses of your audio through, so you hear the thwack of your pick or your snare, but ringing at the particle's note. Step puts everything on a steady rhythm, one note per step, with Density deciding how busy it is. Step plus the Loop pattern is a fun little corner to jam in. Freeze holds whatever's currently ringing out so you can play over it. There's a Drone dial that builds a bed under everything, and 35 scales plus your own custom ones. Plus a quick one-knob reverb, because I really like reverb and I think almost every one of my devices has received at least a little reverb, just in case you need it quickly. To sum up, I'm proud of this and I have been consistently getting lost in it while building and testing. I feel it's the kind of device that you have to get to know a bit. It's pretty dense. It's maybe not for everyone, but for the people who it resonates with, I'm glad you're here and I hope it brings you some inspiration. If you run into any issues or have some feature requests for a later update, don't hesitate to reach out at ian@ijoaudio.com. I appreciate you very much. Cheers! ian - ijo audio
Screenshots
Verdict
The clearest difference is price: Hisooth Resonance™ at Free against Undersong's $9.99. Hisooth Resonance™ also leads on iOS requirement (13.0 vs 17.0). Undersong's advantage is rating (5.0 vs 1.0) and update cadence (daily vs every 4 days). On ads, in-app purchases and device support 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
Hisooth Resonance™ is free to download; Undersong costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Undersong holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: Undersong has 14 ratings behind it against 1, so its average is the more settled of the two.
Hisooth Resonance™ ships an update every 4 days, Undersong daily. The most recent releases landed on November 9, 2026 and November 10, 2026 respectively.
| Parameter | Hisooth Resonance™ | Undersong |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 1.0 (1 ratings) | 5.0 (14 ratings) — better |
| Number of ratings | 1 | 14 — better |
| Update frequency | Every 4 days | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 27 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | 江苏名腾医疗器械有限公司 | ian johnston |
In-app purchases
Hisooth Resonance™
No in-app purchases
Undersong
No in-app purchases








