// ai · offline · ios
Neon Synthetics app icon
// Neon Synthetics v1.0
Free · iPhone · Runs 100% offline

A private AI that
never goes online.

Neon Synthetics is a complete on-device creative studio — a capable language model, a full neon beat studio, an offline Wikipedia, notes and voice, all in one app. No account, no internet, no model download. Nothing you type, hum, or record ever leaves your iPhone.

100% offline · no networking at all 4B model · bundled, ready on first tap 5-in-1 · chat · beats · wiki · notes · voice
Neon Synthetics offline chat
0
// bytes that leave your phone
4B
// parameter model, bundled
1.8k+
// offline wiki articles
// beats, offline
// what's inside

One app. A whole creative studio.

Neon Synthetics isn't just a chat box. It's chat, music, knowledge, notes and voice — every part running on the device in your hand, with the model baked right into the app.

01

On-device AI chat

A Qwen3-4B model running on Apple's MLX framework and the Metal GPU. Streaming replies, editable personas, document chat — works in airplane mode from the very first tap.

02

NEON Beats — a real music studio

Not a toy: an 8-pad sampler and 16-step sequencer, a playable 6-instrument synth with scale-lock, type-to-speech vocals, a mixing console with reverb & delay, song mode with audio export, and 50+ retro sounds. The only offline AI app that's also a beat machine.

03

Offline Wikipedia

A bundled, full-text-searchable snapshot of ~1,800 articles. The AI even cites it — referenced articles appear as tappable chips beneath replies. No signal required.

04

Notes & checklists

Capture ideas, then "Ask NEON" to summarise, expand, or turn a note into a checklist. An interactive home-screen widget lets you tick items off without opening the app.

05

Recording studio

Record voice memos with a live waveform, transcribe them on device, trim and rename, then get an AI summary — or drop a clip straight onto a sampler pad.

06

Voice, both ways

On-device dictation that never touches the cloud, plus read-aloud with neural voices. Type words into NEON Voice and turn them into vocal stabs for your track.

07

Siri & Shortcuts

"Hey Siri, ask Neon Synthetics…" and "New Neon note" via App Intents, plus Spotlight integration — the studio reaches out to the rest of iOS without reaching out to the internet.

08

A studio that feels alive

A synthwave control room — outrun grid, drifting aurora, optional CRT scanlines, a power-on self-test, and a room that glows to the beat. Tune the whole vibe in the Control Panel.

// the sound lab

A full music studio in your pocket.

NEON BEATS is the part no other offline-AI app has — a genuine production suite you can record, remix, arrange, and export with, entirely on the device.

// rhythm

Sampler & sequencer

8 pads, a 16-step grid, tap-tempo, swing, and per-step accents.

// melody

Playable synth

Six instruments — lead, bass, pluck, pad, organ, bells — with key & scale lock so it always plays in tune.

// vocals

NEON Voice

Type words and turn them into vocal stabs — trailer narrator, deep, hype-MC, robot and more.

// sounds

50+ sample vault

Original chiptune, synth, FX and drum one-shots — or import your own and reuse them on any pad.

// mix

Console & FX

Per-pad faders, mute/solo, reverb and delay sends, and a live audio-reactive spectrum visualizer.

// arrange

Song mode + export

Chain patterns into full arrangements, save grooves to a library, and export audio to share.

// write

Lyric Lab

NEON writes original lyrics on-device, with a live syllable counter to fit them to the beat.

// learn

Neon Academy

14 bite-size lessons in real music theory, each tied to a tool in the studio.

// a peek inside

Chat, beats, and everything between.

Five tools, one neon control room — here's what Neon Synthetics looks like running entirely on your phone.

// private by architecture

Not private by promise — private by design.

Most "private" AI apps still phone home. Neon Synthetics has no networking code at all. The model lives in the app bundle, inference runs on the Metal GPU, and your conversations, notes, and recordings are stored only on your device.

No account to create. No telemetry. No analytics SDKs. Turn on airplane mode and everything still works — because it never needed the network in the first place.

// network calls
0
// accounts
0
// trackers
0
// model downloads
0
// where your data lives
On your phone. Only.
// under the hood

Built on Apple silicon, end to end.

The kind of on-device AI engineering we do for clients — shipped as a real product.

// model

Qwen3-4B

4-bit quantized, ~2.3 GB, bundled in the app. Apache-2.0 licensed.

// inference

MLX Swift

Apple's array framework on the Metal GPU. Live tokens/sec telemetry per reply.

// retrieval

On-device RAG

BM25 search over a bundled SQLite/FTS5 wiki — citations the model can actually open.

// audio

AVAudioEngine

The whole beat studio: synth voices, sampler, mixer, reverb & delay, live capture.

// data

SwiftData

Conversations, notes, recordings, samples, patterns and songs — stored locally.

// platform

WidgetKit · App Intents

Interactive widgets, Siri and Shortcuts — SwiftUI throughout, iOS 17+.

// available now

Neon Synthetics is on the App Store

Free on the App Store, with an optional one-time NEON PRO unlock for the full sound lab. Built for Apple silicon — iPhone 15 Pro and newer.

Get on the App Store →