Android · On-device AI · Launching on Google Play

Calls shouldn't stop
your music

Sllo turns your music down instead of off when the phone rings, says who's calling, and lets you answer with one word. When you hang up, your song picks up right where it was.

Free 7-day trial at launch · A few updates, then the launch email · Unsubscribe anytime · Privacy

See it duck a real call

The problem

Every phone call is a small interruption

Phones still treat your music and your calls as rivals. Sllo makes them work together.

Silence

The music just stops

A call comes in and your playlist cuts out mid-chorus — even when it’s a number you were never going to answer.

Eyes down

You look at the screen

To see who it is, you take your eyes off the road. To answer, you take a hand off the wheel.

Restart

Then you fix it yourself

After the call: find the app, press play, nudge the volume back to where it was. Every single time.

Live demo — try it below

See the duck, not the pause

Now playing

Night Drive

Sllo Radio · Ambient Flow

Media volume: 100%

Real audio ducks live and an AI voice actually speaks over it — the real thing does the same for whatever you're playing, on your phone, in the background.

What it does

Built for the moment your phone rings

Ducks, never pauses

When your phone rings, Sllo lowers the music to a level you choose instead of stopping it. The track keeps playing under the ringtone.

Puts it back exactly

Missed, declined or answered — when the call is over your music returns to the volume it was at, even across back-to-back calls.

Tells you who’s calling

Sllo reads the caller’s name aloud over the music, so you know whether to pick up without looking at the screen.

Answer with your voice

Say “accept” or “decline” while it rings. Hands stay on the wheel, eyes stay on the road.

WhatsApp calls too

Internet calls get the same treatment — ducked, announced, and answered or declined by voice.

Private by design

Speech recognition runs on the phone. No account, no servers, no audio ever uploaded.

How it works

Turn it on once

Install Sllo, allow phone access, and tap the button. It stays on in the background — even after updates — until you switch it off.

A call comes in

Your music dips to the level you chose and keeps playing. Sllo says who’s calling — cellular or WhatsApp.

Say the word

“Accept” to answer, “decline” to send it away. When the call ends, your music comes back at exactly the right volume.

Tested, not promised

Proven on a real phone with real calls

Every behaviour on the right was confirmed by placing actual calls to a Samsung Galaxy Z Fold5 on Android 16 — over the phone speaker and a Bluetooth speaker, with Spotify playing. We publish what we've seen work, and nothing we haven't.

Samsung Galaxy Z Fold5 · Android 16

Music ducks while ringing and keeps playing
Volume restored after missed, declined and answered calls
Correct level after back-to-back calls
Caller name announced over the music
“Accept” answers, “decline” declines
WhatsApp calls ducked, announced and answered by voice
Restarts itself after an app update or force-stop
Phone speaker and Bluetooth speaker

Pricing

Try it free for 7 days

No ads. No account. No data sold — there's no server to sell it from.

Monthly

$4.99/month

Cancel anytime

Annual

Best value

$49.99/year

Two months free

Planned launch pricing. Waitlist members hear about any founding offer first.

For investors

A hands-free layer for every call on the road

Sllo is a working product, tested on real hardware, built to run with no servers. We're speaking with angels and early-stage funds who back consumer mobile and on-device AI.

Investor overview & deck request

Zero backend
All AI runs on the phone — near-zero cost to serve each user.
Hard to copy
Deep Android telephony, audio-focus and call-app integration, proven on device.
Subscription
Recurring revenue from day one, with a free trial to convert.

Questions

When can I get Sllo?

Sllo is finishing device testing ahead of its Google Play launch. Join the waitlist and you’ll get an email the day it goes live.

Does my music keep playing while I’m on the call?

No — and no app can. Android itself pauses media once a call connects. Sllo keeps your music playing while the phone rings, then brings it back at the right volume the moment you hang up.

Which phones does it work on?

Android only for now. Every feature on this page has been confirmed on a Samsung Galaxy Z Fold5 running Android 16; more devices are being tested before launch.

Is it listening to me all the time?

No. Sllo only listens for “accept” or “decline” while a call is ringing, and that recognition happens entirely on your phone. Nothing is recorded or sent anywhere.

What about iPhone?

An iPhone version is in the works for the App Store. iOS is stricter than Android about one app changing another’s volume or answering calls by voice, so we’re working out exactly what it allows first. Android launches first on Google Play.

Be first on the road with Sllo

Launching on Google Play. Waitlist members get the launch email first and hear about any founding-member offer before anyone else.