Plugins built by a working musician, in Haarlem.

I’m Andy. I make records, I produce other people’s, and I built software for years before that. Every plugin here started as a problem in my own sessions, and I use them every week. That is where the updates come from.

Helder is Dutch for clear. Each tool works the way you think, and has already dealt with the problems you’d hit: Kelder’s effects leave the low end alone, and Sfeer leaves room for the bass and the voice.

No subscriptions and no accounts. Every plugin has a 14-day trial, free updates within its version, a plain refund policy, and support by email from the person who wrote it.