SUS4 Loop Builder vs OSE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SUS4 Loop Builder
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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/
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.
- 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
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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
Verdict
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
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.
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.
| Parameter | SUS4 Loop Builder | OSE |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.9 (7 ratings) — better |
| Number of ratings | — | 7 — better |
| Update frequency | Every 4 weeks | Every 3 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 27 MB | 81 MB |
| Age rating | 4+ | 4+ |
| Developer | ThePaulSmith | Outhentic EOOD |
In-app purchases
SUS4 Loop Builder
- SUS4 Loop Builder Pro Monthly7 Days trial$0.991 Month
- SUS4 All-Access7 Days trial$4.991 Month
- SUS4 Loop Builder Lifetime$59.99
OSE
No in-app purchases









