Comparison

SUS4 Loop Builder vs OSE

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

Head to head
About

SUS4 Loop Builder

Features
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Record a part, loop it, and stack the next one on top. Up to eight tracks, each with a level control, so the idea sounds like a song before you leave the room. Fully on-device: no cloud, no account. Start with a chord loop, add a bass line, then a melody. Undo the last layer if it was wrong. When it works, export the mixdown as an audio file. • Up to 8 loop tracks, with level and mute per track • Undo the last layer • Export the mixdown as an audio file • A library of saved loop sessions For guitarists and singers building song ideas, beatboxers, and anyone who uses a loop pedal on stage and wants one in their pocket. Pro, or SUS4 All-Access across the whole range, adds reverb, delay and 3-band EQ on each layer, stem export (every track as a separate file) and unlimited saved loops. Made in the UK by working musicians. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

OSE

A pocket-sized toolkit for musicians featuring a multi-touch synth, MIDI recorder, piano roll editor, tuner, metronome, and audio tools. It complements desktop Digital Audio Workstations with professional-grade DSP effects and editing capabilities.

Highlights
  • Expressive multi-touch synth with DSP effects
  • MIDI recorder and piano roll editor
  • Chromatic tuner with reference tones
  • Metronome with savable presets
  • Audio recorder with real-time effects
  • Audio editor with restoration tools
Features
Read full description

Not a toy. Music tools that work. OSE (Outhentic Sound Engine) is an instrument and toolkit for people who play. Synth, recorder, piano roll, metronome, tuner — eight focused tools that fit in your pocket and complement the desktop DAW you already use, rather than replace it. Everything runs on your device. PLAY • Expressive multi-touch synth with a real DSP chain — filters, envelopes and effects you hear live. • 140+ instruments and presets across keys, bass, pads, leads, plucks, drums and more. • Drum-pad, piano and split/layer layouts. • USB and Bluetooth MIDI keyboards. RECORD & EDIT • Record your playing as MIDI and arrange it in a piano-roll editor — move, quantize, transpose and edit velocity. • Audio recorder with a real-time effects monitor: hear your effects while you play. • Audio editor with restoration tools — declick, declip, denoise, normalize — plus cut, fade, speed and pitch. PRACTICE & MEASURE • Chromatic tuner — fast and accurate, with reference tones. • Metronome with simple and complex meters, subdivisions and savable presets. • Signal generator — sine and other waveforms, sweeps and a built-in timer. • Sound-level meters — SPL, FFT spectrum, spectrogram and peak hold. THE EIGHT TOOLS Synth · Recorder · Piano roll · Tuner · Metronome · Signal generator · Meters · Audio editor

Screenshots

SUS4 Loop Builder4 screens
OSE4 screens

Verdict

The call

The clearest difference is in-app purchases: OSE at none against SUS4 Loop Builder's 3. SUS4 Loop Builder's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement 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

Both are free to download. SUS4 Loop Builder sells 3 in-app purchases, starting at $0.99 per month. OSE asks for nothing beyond the download.

UpkeepUpdate frequency

SUS4 Loop Builder ships an update every 4 weeks, OSE every 3 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 7 level
SUS4 Loop Builder versus OSE: the parameters behind the verdict, then further details
ParameterSUS4 Loop BuilderOSE
PriceFreeFree
Rating—4.9 (7 ratings) — better
Number of ratings—7 — better
Update frequencyEvery 4 weeksEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesYesNo — better
Monetization—Free with in-app purchases
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS16.016.0
Further details — not scored
Size27 MB81 MB
Age rating4+4+
DeveloperThePaulSmithOuthentic EOOD

In-app purchases

3 purchases

SUS4 Loop Builder

Subscriptions2
  • SUS4 Loop Builder Pro Monthly7 Days trial$0.991 Month
  • SUS4 All-Access7 Days trial$4.991 Month
One-time1
  • SUS4 Loop Builder Lifetime$59.99
None

OSE

No in-app purchases

Questions

Is SUS4 Loop Builder free?
SUS4 Loop Builder is free to download, with in-app purchases available.
Is OSE free?
OSE is free to download, with no in-app purchases.
Do SUS4 Loop Builder or OSE have ads?
OSE shows ads; SUS4 Loop Builder does not.
Which is updated more often, SUS4 Loop Builder or OSE?
SUS4 Loop Builder ships an update every 4 weeks, and OSE every 3 weeks. Most recently, SUS4 Loop Builder was updated on October 25, 2026 and OSE on October 24, 2026.

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