A Wear OS watch that fires sound, on-screen effects & real props from a flick of your wrist — and every bit of it is yours to build. Use your own media, record your own gestures, and chain them into combos, so each character in your closet gets its own show.
What it does
CosNFX reads a natural gesture and fires all three at once, in sync — hands empty, eyes up, fully in character.
A sound fires from the watch when it detects your gesture — from the free built-in library or your own audio. Route it to the watch, your phone, or any browser, or play it across several devices at once.
Each identity throws a live energy field across the watch face, coloured to the character — plus optional full-screen effects and a camera-flash muzzle on your phone.
Over Wi-Fi the same gesture drives your gear: LED strips (WLED), smart lights (Hue), smoke & fans (Home Assistant), ESP32 builds — and pro lighting rigs via DMX (Art-Net) and OSC.
Built for costumers
Thirty ready identities give you a head start. Record your own signature gestures, chain them into combos, and drop in your own sounds and art — until each character in your closet fires exactly the effects you pictured.
Record a signature move with Pro — the watch learns how you throw it. Then chain any built-in or custom gestures into timed finisher combos; combos are free.
Upload your own WAV, MP3, or OGG and assign it to any gesture. A big themed library is built in and free — bring your own for the exact hit you hear in your head.
Drop in your own artwork and colours for a character's HUD backdrop, or pick a cinematic scene and a dynamic energy field. Every identity, reskinned to you.
Teach Underhand, Overhand, Down-punch, and Strike your own motion. Calibration is free; Fist, Raise, and Hip thrust use built-in detection. Reset to defaults anytime.
The full kit
A complete costume-FX rig that lives on your watch and opens up as far as you want to take it — from a solo sound board to a whole synced show. Free unless marked Pro.
Underhand, overhand, strike, down-punch, hip-thrust, fist-clench & raise — seven built-in moves, enabled on a fresh install. Tap the identity name on the watch to arm; tap again to disarm.
Record your own signature moves with Pro, then chain any built-in or custom gestures into timed finisher combos. Combos are free.
A big built-in library of themed effects, all free. Assign any sound to any gesture — or upload your own WAV, MP3 & OGG Pro.
Set each identity's HUD backdrop, energy field & colours — a cinematic scene, a solid colour, or your own artwork Pro.
Calibrate Underhand, Overhand, Down-punch, and Strike to your motion for free. Choose your wrist in System, then rehearse and adjust before a performance.
Send each gesture's sound to the watch, your phone, or any browser — and split the main and support layers across devices, however you like.
Fire a gesture across several phones and screens at once from Mission Control — turn the room into a surround rig.
A full control panel the watch serves to any browser on your Wi-Fi. Your buttons appear as a live ring — tap a pad to set its gesture, sound, and effect, and watch it flash as you perform. Locked to a 6-digit PIN the watch shows you.
Edit identities, sounds, looks, and gestures over Bluetooth, with phone audio and camera-flash effects. Media uploads and prop tests open browser Mission Control over Wi-Fi.
Drive WLED, Hue, Home Assistant (smoke & fans) & ESP32 over Wi-Fi — plus DMX (Art-Net) and OSC for lighting consoles and show-control.
Link two or more watches over Wi-Fi for versus play — strikes deal damage, a held raise blocks. Cosplay face-offs, reenactments, LARPs, or a backyard duel.
The watch detects gestures and plays sound offline. No CosNFX account or ads; the developer collects no personal data or app analytics through the app. Optional connections are explained in the privacy policy.
The gesture set
Seven gestures work out of the box, pre-calibrated — then record your own and chain any of them into combos.
30 identities — each its own colour, sound kit & energy field
On a real watch
CosNFX is a true Wear OS app — the HUD, the engine, and the sound all live on the watch. Arm it, throw the gesture, and it fires with nothing else in the room. Bring in your phone or Wi-Fi only when you want more: a louder speaker, the browser control panel, real props, or Battle mode.
One minute, the whole rig
Every frame is a real screen recording of the app — the fires, the characters, the editors, the whole kit.
Also on YouTube.
Pricing
The full experience is free — all 30 identities, every sound, every visualization, the whole library. One optional one-time US $4.99 Pro unlock turns it into a creative rig: your own sounds and art, custom-recorded gestures, real prop & lighting control, extra Mission Control screens, and Battle mode. One purchase covers watch and phone on the same Google account. Local pricing is shown by Google Play.
The built-in library and controls, ad-free.
Everything in Free, plus the full creative rig — yours for good.
Watch 2.15.1 · Phone companion 1.2.0 · Published September 3, 2026
Optional add-on packs · later
A plain-English walkthrough — arm the watch, learn the gestures, build your own identity, wire up lights and smoke, and run a Battle. Everything the app can do, step by step.
Straight answers
Use a compatible Wear OS watch; Google Play shows availability for your device. Gestures are tested and tuned on Galaxy Watch 7. Other watch models may need calibration and rehearsal. Prefer a turnkey device? Join the waitlist for a standalone CosNFX watch with the software pre-installed.
Yes — completely. All 30 identities, every sound, every visualization, every gesture, the HUD, and the browser control panel are free. One optional one-time US $4.99 Pro purchase (no subscription) adds the power-user tools: custom-recorded gestures, your own audio/image uploads, real prop control, extra Mission Control screens, and Battle mode.
The watch is fully standalone — it fires sound entirely on its own, with or without Wi-Fi. Your phone joins over Bluetooth as a louder speaker — no Wi-Fi needed. Bring in Wi-Fi for the browser control panel, prop triggers (lights/smoke), or Battle mode.
CosNFX is a Wear OS app, so the watch part runs on compatible Wear OS watches, not Apple Watch. The control panel is a web page, so any phone's browser — iPhone included — can configure it and act as a speaker.
Open Mission Control (or the companion app) and edit any identity — pick sounds per gesture from the built-in library, set the look, and tune sensitivity. With Pro you record your own gestures and upload sounds and art through browser Mission Control on the watch's Wi-Fi. The full walkthrough is in the manual.
The developer collects no personal data or app analytics through CosNFX. Watch gestures and sound work offline. Browser Mission Control connects directly over local Wi-Fi using the watch's 6-digit PIN; use a trusted network or your own hotspot. The phone companion uses Google's Wear Data Layer, which may route through Google's cloud when Bluetooth is unavailable. Optional HTTPS prop cues go to the destinations you configure. Google Play purchases and Android system backup also follow their respective services and settings. See the privacy policy.
Get CosNFX
CosNFX is out now on Google Play — free to install, yours to make your own. Grab it and arm your first identity in minutes.
Free · Compatible Wear OS watches · no CosNFX account, no ads
