Billie Tracker vs Gliss
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Billie Tracker
Create music with a powerful groovebox featuring a step sequencer, synthesizers, and a sampler. Arrange patterns into songs, shape unique sounds, and export your finished tracks. Designed for intuitive music production on mobile devices.
- Step sequencer for notes and instruments
- Shapeable synth instruments
- In-app sampler for recording sounds
- Mixer with per-track controls
- Song arrangement and export options
- Hardware controller support
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Billie Tracker is a groovebox: a step sequencer, synth instruments, a sampler and a mixer, built as one instrument for your phone or tablet. You write music in a grid. Notes go into patterns, patterns chain into sections, and sections line up into a song, so a full track grows out of small pieces you can reuse and rearrange. Trackers have worked this way for decades. If you have used one, this will feel like home. If you haven't, a built-in tutorial walks you through your first pattern, and every screen has help one key away. It is not tied to one sound. Shape the synths from clean tones to heavy drive, sample anything and play it back as an instrument, and make whatever you want to make: techno, ambient, hip hop, pop, or the 8-bit styles trackers are known for. Rows hold up to eight notes, not just one. Every instrument is polyphonic, so a chord goes into the grid the same way a single note does. Hold one on a MIDI keyboard and it lands across the row's note lanes, quantized and in key. What you get: - A step sequencer for notes, instruments, volume and effects, with chains and a song view for arrangement - Up to eight note lanes on every row, so chords are typed in like single notes, on any instrument - Synth instruments you can shape: timbre, color, filter, drive, envelopes and LFOs - A sampler that records straight into the app, so your own sounds sit next to the synths - A mixer with per-track levels and sends - BOUNCE and STEMS, so a finished song leaves the app as audio - Bundles: a song and every sample it uses travel as one file - A control surface built for tracker speed. Hold one key, press another, fast. Rearrange the layout to fit your hands, or plug in a hardware keyboard or game controller - Themes, KEY and SCALE settings, and a HELP key that explains whatever you are looking at Your songs are ordinary files. There is no account and nothing to sign into. Send a song to a friend, email one to yourself, or move it around in your file manager. Nothing is uploaded to us and nothing is locked to us. Billie Tracker is made by Billie Workers' Co-op. The people using it steer what gets built, and the Discord is the fastest way to reach us.
Gliss
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Gliss is a touch instrument that sings. Two lines of light run across the screen. Slide a finger along one and the pitch follows continuously, like a voice or a bow, never stepping from key to key. Press lower on the line and the note swells; lift toward it and it fades to a breath. GRAVITY Each note of the scale is a well. Turn gravity down and the lines are fretless: every pitch in between is yours. Turn it up and your finger is gently pulled into tune: slide freely, land exactly. All the way up, it locks. FLEX The pitch follows your finger on an elastic. Loose, and it lags behind with a slow, singing portamento. Tight, and it snaps. SOUNDS 24 sounds built around a singing core: strings, voices, winds, leads, basses, pads, plucks and a few oddities, like a cello that sings, a choir, a horn in the fog. A slow orbital vibrato settles in once the note has been held, the way a singer's does. Shape any sound with tone, texture, subharmonic mixture, formant, filter and envelope. 28 TUNINGS Western modes, blues, Arabic maqam with true quarter tones, Turkish makam, Persian dastgah, klezmer, Southeast Asian scales, just intonation, 19 and 31 equal temperaments. Neutral intervals can be shaded from Egypt to Syria. MORE THAN TWO FINGERS • Chords: one finger can play a fifth, a triad, a seventh or an octave, always inside the scale • Arpeggiator: up, down, up and back, random, locked to tempo • Looper: record, overdub, loop, clear • Lanes: give each line its own sound, chord and octave • Tilt the device to bend and open the filter • Flick a note and it slides away, bounces and fades. Touch it to catch it IN YOUR HOST (AUv3) Gliss is also an AUv3 instrument for AUM, Loopy Pro, GarageBand, Logic and every host that loads Audio Units. Play its two lines with your fingers inside the host, or from a keyboard, an MPE controller or a MIDI track: every note lands on a line and gravity pulls it into your tuning. Ten parameters to automate, factory presets, and the whole instrument saved with your project. FREE, THEN PRO AND STUDIO Gliss is free to play: the whole gesture, three sounds (VOIX, PLUIE NOIRE, KOTO LUNE) and three tunings (major, minor and maqam Rast), in the app and in your host. Two one-time purchases, each on its own: GLISS PRO for the app unlocks all 24 sounds and their settings, all 28 tunings, chords, the arpeggiator, the looper, lanes, tilt and effects. GLISS STUDIO for your host unlocks every sound and tuning in the AUv3 plugin, with MIDI and MPE in and automation. No subscription. Designed for iPhone, iPad and iPhone Duo: landscape on a phone, any way you hold a large screen, the bars on the flat half and the settings on the raised half when it is folded. Dark, with nothing on screen that is not sound. No account. No ads. No tracking. Gliss collects nothing; your settings stay on your device.
Screenshots
Verdict
The clearest difference is in-app purchases: Billie Tracker at none against Gliss's 2. Billie Tracker also leads on update cadence (every 2 days vs every 5 weeks) and iOS requirement (15.1 vs 17.0). On price, ads 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
Both are free to download. Gliss sells 2 one-off in-app purchases. Billie Tracker asks for nothing beyond the download.
Billie Tracker ships an update every 2 days, Gliss every 5 weeks. The most recent releases landed on October 17, 2026 and October 31, 2026 respectively.
| Parameter | Billie Tracker | Gliss |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 2 days — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 57 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Billie Cooperative | Thinkspark |
In-app purchases
Billie Tracker
No in-app purchases
Gliss
- GLISS STUDIO$12.99
- GLISS PRO$12.99









