Keystone is where you write down the things only you know — logins, vendors, client history, what's owed — so the business doesn't depend on your memory.
No cost yet. Just tell us if this is worth building.
Most small businesses run on one person's memory. There's usually no plan for what happens when that memory is unavailable.
Not a wiki. Not a giant onboarding doc nobody reads. Five things, kept current, that someone else could actually use in an emergency.
If the question at the top made you pause, that's the whole signal we're looking for. Leave your email and we'll let you know what happens next.