SonicSwarm vs SyncSong

Turn any group of phones into one giant speaker. Nobody brought a Bluetooth speaker? No problem. SonicSwarm turns the phones already in everyone's pockets into one synchronized sound system. Host a swarm, have friends join, hit play — every connected phone plays the same audio at the exact same moment. Spread the devices around the room and the combined sound fills the space. No accounts. No sign-up. No cloud servers. Everything syncs directly between the phones on your Wi-Fi network. HOW IT WORKS One person taps "Host a Swarm" and picks what to play. Everyone else taps "Join a Swarm" and connects automatically over the local network. When the host presses Play, every phone starts playing together using a peer-to-peer clock-sync algorithm built specifically for this — no cloud round-trip, no buffering delay, just phones talking directly to each other. PLAY YOUR OWN FILES Import any audio file already on your device — from the Files app, iCloud Drive, AirDrop, wherever. This is SonicSwarm's tightest sync mode: the host sends the file to every connected phone, and playback is scheduled using hardware-level timestamps for very close alignment across devices. Previously imported tracks are saved automatically, so you can reuse them instantly next time without digging through Files again. PLAY FROM SPOTIFY Have a Spotify Premium account? Copy a track link from the Spotify app and paste it into SonicSwarm — it plays across every connected phone that also has Spotify installed. A convenient way to play anything in Spotify's catalog without needing the file itself. WHO IT'S FOR Backyard hangouts and campsite gatherings where nobody packed a real speaker Dorm rooms and small get-togethers Anywhere a single phone speaker just isn't loud enough, but a real speaker isn't around WHAT MAKES IT DIFFERENT Most multi-device audio comes with a subscription. SonicSwarm doesn't gate the core feature behind a paywall or a monthly fee — host and join freely, using audio you already own. Under the hood, SonicSwarm doesn't just tell every phone to "hit play at the same time" and hope for the best. It actively measures the clock offset between every connected device using a lightweight, continuous ping exchange, then schedules playback using each phone's own hardware audio clock — the same category of technique used in professional audio synchronization, built for a phone in your pocket. GOOD TO KNOW All devices need to be on the same Wi-Fi network (or close enough for a Bluetooth fallback) Spotify playback requires Spotify Premium and the Spotify app installed on every phone in the swarm, not just the host — sync quality for Spotify is close but not sample-accurate, since playback runs through Spotify's own app rather than SonicSwarm directly Import Track offers the tightest, most precise sync of the two playback modes Works best with a handful of devices in one room — very large groups (10+ phones) may see slower connection and file-transfer times

SyncSong plays the same music, at the same moment, on several phones at once. One phone is the host: it holds the music and controls playback. Every other phone joins as a client, receives the songs it does not already have, and follows the host's playhead in real time. Press play once and the whole room hears it together. NO NETWORK REQUIRED Phones find each other over Bluetooth LE, so SyncSong works on a walk, in a park, in a car — anywhere, with no shared Wi-Fi and no internet connection at all. On a network you know, switch to Wi-Fi instead for much faster song transfers. The choice is a single tap on the home screen and it is remembered. NOTHING TO SIGN UP FOR There is no account, no subscription and no cloud service. Your music never leaves the phones taking part. Hosts are discovered automatically on the same network; if discovery is blocked, a host's address can be typed in by hand. STAYS IN STEP The client measures the round trip to the host rather than trusting the two clocks to agree, so playback stays aligned even when the phones' clocks differ. Drift is corrected continuously, and a per-host offset control lets you nudge the timing by hand if one phone's speaker or headphones run behind. BRING YOUR OWN MUSIC Add songs from your music library, from Files and Downloads, or from a direct link to an audio file. The host's library is shared with everyone who joins. WHAT IT IS NOT SyncSong is not a streaming service and has no catalogue of its own. It plays audio files you already have. It cannot play music from a streaming subscription, and it cannot export DRM-protected tracks from your library. Up to four phones can follow one host at a time.