← All Builds DAY 31 OF 30

SundaySync

Family and household coordination — the Sunday-night planning ritual rebuilt as software that does the coordinating so the family gets the evening back; AI-native, optimized for time off the app rather than time on it · Build details to be published at launch — SundaySync is build-complete and working, with an investor attached; the venture is in the operator-search phase, and the public build record will be completed when the founder is in place

Day 31 — built, working, and looking for its founder

SundaySync is the Sunday-night ritual every household already runs — who’s where this week, what’s due, who drives whom, what’s for dinner — rebuilt so the software does the coordinating and the family gets the evening back. It’s one of five builds in the Day 31 epilogue. This one isn’t a launch. It’s a flare.

The problem

The Sunday-night scramble is universal and the existing tools make it worse. Shared calendars are passive databases that still need a human to cross-reference them. Family-organizer apps optimize for engagement — more notifications, more time in the app — which is exactly backwards for a problem whose whole point is to free up the evening.

What SundaySync does

It collapses the family-planning ritual into the smallest possible interaction window, surfaces only the conflicts and decisions that actually need a person, and then gets out of the way. The design goal is time off the app, not time on it. The product is most successful when it’s briefly used and then ignored — when the family spends Sunday evening together instead of negotiating a calendar.

Honest status: the seat is open

SundaySync is coded. It works. An investor is already in. What it doesn’t have yet is the entrepreneur to carry it — the operator who lives this problem, owns the go-to-market, and sits at the table at founder weight, not advisor weight.

That’s the one piece of the Silverback pattern SundaySync is still missing, and it’s the most important piece. Every venture in the 30-day run had a domain operator at founder weight from day one. SundaySync is the case where that seat is still empty — and saying so plainly is the point, not a weakness. The product is the easy part. The right founder is the constraint.

For builder-operators

If you’ve felt the Sunday-night family-logistics grind and wanted to fix it for real: the product exists, the capital is interested, and the founder seat is open. That’s a rare way to start. Watch this space — or skip the waiting and reach out: todd@silverbackcto.com.