Calvo：カレンダー連携でかんたん自動請求書作成

Calvo：カレンダー連携でかんたん自動請求書作成 is a business app by Velura with 1+ downloads (about 1 estimated). Released May 24, 2026. Install growth, rank history, SDKs and ad networks.

From the store listing: “Automatically calculate working hours based on Google Calendar schedules. Create and email invoices that comply with the invoice system with just one tap. Eliminate administrative work for freelancers.”