Comparison

Braindance vs Undersong

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Braindance

This app allows real-time audio manipulation with buffer-glitch effects. Create complex rhythmic patterns, apply various audio transformations, and perform live with intuitive controls. It can be used as a standalone application or as an Audio Unit within other hosts.

Highlights
  • Real-time buffer-glitch audio manipulation
  • Step sequencer with Euclidean patterns
  • Multiple audio effects (bitcrush, flanger, delay, reverb)
  • Master filter with various modes
  • Live performance controls (XY pad, macros)
  • AUv3 and MIDI support
Features
Read full description

Braindance is a buffer-glitch effect for iOS. Feed it audio and cut, stutter, repitch and mangle it in real time. SEQUENCE Build glitch patterns on a step sequencer with gate, repeat, reverse and pan lanes. Fill rhythms with Euclidean patterns, set step size and length, and capture what you just played onto the history tape. EFFECTS Shape the result with bitcrush, flanger, delay and reverb, then a master filter with switchable SVF, ladder, comb and resonator modes. Automate any parameter with per-slot shapes and depth over a chosen number of bars. PERFORM Play the effect live. Morph between settings on an XY pad, hold macros like Fire, History, Forget and Freeze, and fire launch pads including Trance Gate, Half-Time, Tresillo, IDM Chop, Stutter, Machine Gun, Glitch Walk, Reverse Rain, Ping Pong, Repitch, Dub Siren and Clicks + Cuts. AUv3 Run Braindance as an Audio Unit inside your host to process tracks in place, or play it standalone. A MIDI variant is included for triggering glitches from a keyboard or sequencer. Three themes: Ark, Candy and Clarity.

About

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.

Highlights
  • 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
Read full description

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

Braindance4 screens
Undersong4 screens

Verdict

The call

The clearest difference is update cadence: Undersong at daily against Braindance's weekly. Braindance's advantage is price ($4.99 vs $9.99) and iOS requirement (15.0 vs 17.0). On rating, ratings volume, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Braindance costs $4.99 and Undersong $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Braindance against 5.0 for Undersong. Both are backed by a comparable volume of ratings — 5 and 11 respectively.

UpkeepUpdate frequency

Braindance ships an update weekly, Undersong daily. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard3 real differences · 7 level
Braindance versus Undersong: the parameters behind the verdict, then further details
ParameterBraindanceUndersong
Price$4.99 — better$9.99
Rating5.0 (5 ratings)5.0 (11 ratings)
Positive reviews83.3% of reviews—
Number of ratings511 — better
Update frequencyWeeklyDaily — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size53 MB19 MB
Age rating4+4+
Developerfourtrack.fm LLCian johnston

In-app purchases

None

Braindance

No in-app purchases

None

Undersong

No in-app purchases

Questions

Is Braindance free?
Braindance costs $4.99, with no in-app purchases.
Is Undersong free?
Undersong costs $9.99, with no in-app purchases.
Which has better reviews, Braindance or Undersong?
Braindance and Undersong are both rated 5.0 out of 5 on the App Store, from 5 and 11 ratings respectively.
Do Braindance or Undersong have ads?
Neither Braindance nor Undersong shows ads.
Which is updated more often, Braindance or Undersong?
Braindance ships an update weekly, and Undersong daily. Most recently, Braindance was updated on October 24, 2026 and Undersong on October 25, 2026.

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