Volume² is free. It does not have to be.
There is no paid tier, no upgrade and nothing held back — the free download is the whole program. If it has saved you some annoyance over the years, here are the ways to say so.
PayPal
Any amount, one time. The most direct route — nothing is taken out by a storefront along the way.
Masked against spam bots — Copy puts the full address on your clipboard. In PayPal choose Send and paste it.
Microsoft Store
Buying it there is a donation with a receipt. You get the identical program, plus automatic updates.
Open in StoreSteam
Same idea, if Steam is where you already spend. It updates through your library like a game.
Open in SteamFree things that cost nothing else
Reporting a bug clearly, translating the interface into your language, or answering someone in the comments is worth as much as money and takes an afternoon.
Volume² will stay free regardless. Donations do not unlock anything, do not remove anything, and do not put you on a list — there is no mailing list to be on.