Marc

@marc_kumiko123

Leipzig, Saxony, Germany

Cashcolt
Cashcolt is a loan and amortization calculator for households and advisors. Live repayment schedule, overpayments, debt-free date, multi-loan portfolio dashboard, and a repayment optimizer that shows where extra payments save the most interest. Free calculator without signup. GDPR-compliant, hosted in Germany, zero tracking cookies.
publicstatus
$undefined/mo
Status pages with incident timelines

Recent activity

Commented onI shipped v2 with zero paying customers. Here's the honest version.2026-08-03
Commented onWhere do you draw the line when agents can call real tools?2026-08-02
Commented onShipped: 5 critical bugs fixed on JewelViz this week.2026-08-02
Commented on17yo solo founder building AI invoice generator — launching Aug 42026-08-02
Commented onI built a free e-signature tool that doesn't make you create an account — would love feedback2026-08-02
Commented on17yo solo founder building AI invoice generator — launching Aug 42026-08-02
Commented onSolo founders: how do you handle changelogs, maintenance notices, and status updates today?2026-08-01
Commented onBuilding a Shopify bundles app for stores with real fulfillment: here's the wedge2026-08-01
Commented onWhere do you draw the line when agents can call real tools?2026-08-01
Commented onSolo founders: how do you handle changelogs, maintenance notices, and status updates today?2026-08-01
Commented onBuilding eMedAlert: Clinical Emergency Intelligence for a Safer Future2026-08-01
Commented onBuilt a study tool, launched it, made $0 so far. What actually got you your first users?2026-08-01
Commented onWe rebuilt our Stripe-to-Google-Sheets tool and are launching on Product Hunt tomorrow2026-08-01
Commented onSolo founders: how do you handle changelogs, maintenance notices, and status updates today?2026-08-01
Commented onBuilding a Shopify bundles app for stores with real fulfillment: here's the wedge2026-07-31
Commented onWhere do you draw the line when agents can call real tools?2026-07-31
Commented onBuilding a Shopify bundles app for stores with real fulfillment: here's the wedge2026-07-31
Commented onMCP just went stateless and nobody's talking about what this means for indie devs2026-07-31
Commented onShow IH: I lost three weeks of AI context in one mistake. So I spent over a year building a local memory forest. (Mac only)2026-07-31
Commented onShow IH: I lost three weeks of AI context in one mistake. So I spent over a year building a local memory forest. (Mac only)2026-07-31