Unofficial · not affiliated with GoogleGoogle Home Volume Sync

Keep google home speaker and device volumes in sync with the program running on your Windows computer. It looks for changes in volume in devices, and matches the volume on devices you assign in this program. You can also adjust relative volume gain to balance volumes as desired throughout your home.
⬇ Download for Windows View on GitHub (open source)
Free · runs 100% locally on your network · no cloud account needed · starts with Windows

What it does

Finds every Cast device

Google Home, Nest Mini, Nest Audio, Nest Hub, Chromecasts and cast groups appear automatically.

Sync groups

Group any speakers; change one volume anywhere (app, phone, or the speaker itself) and the rest follow instantly.

Sync Gain balancing

Set a per-device 0–200% gain so quiet corners get boosted and loud rooms stay tame.

System tray presets

Right-click the tray icon and set any group to 5%…100% in two clicks, plus play/pause controls.

Scheduler

Quiet the house at bedtime: weekly day/time rules that set volumes for groups or single devices.

More than Google

Also controls Roku TVs, Yamaha MusicCast receivers, LG webOS TVs and Optoma projectors, in the same sync groups.

Roku is tested on real hardware. The Yamaha, LG and Optoma backends are written to spec but untested — reports welcome.

Hardware that pairs well with it

Google Nest Audio three-pack bundle product photo Google Nest Audio (3-Pack) — Multi-Room Smart Speaker Bundle ★★★★★★★★★★ 4.5 (214 ratings) Three full-size Nest Audio speakers — enough to cover a living room, kitchen and bedroom in one go, and they pair into stereo sets this app treats as one device. Sold by the Google Store. View on Amazon Intel N100 Mini PC (Windows 11) A tiny ~6 W always-on PC is perfect for running the sync service 24/7 — silent, cheap, and it disappears behind a monitor or on a shelf. Plenty of near-identical models, so compare on price. Browse on Amazon Google Nest Mini (2nd gen) The cheapest way to put synced audio in every room. Google has wound this one down, so what is left is mostly used and third-party stock — check the seller before you buy. Browse on Amazon Google Nest Hub (2nd gen) A screen for the kitchen or bedside — shows what’s playing and joins sync groups like any speaker. Availability comes and goes, so it is worth watching the listings. Browse on Amazon Google Nest Hub Max The big-screen, big-speaker option for the main room. Mostly imported stock on Amazon now — check the region and plug type before ordering. Browse on Amazon Chromecast with Google TV (4K) Brings your TV into the same volume groups and schedules. Current listings are mostly resellers rather than the Google Store, so compare prices carefully. Browse on Amazon

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