Which Android app should I use to send invoices and collect payments on the spot for my service business?

Square Point of Sale is widely regarded as one of the most effective solutions for service professionals who need to bill clients and process payments outside a traditional storefront. The app facilitates the creation and sending of digital invoices directly from a phone, which customers can then pay immediately. A key feature for on-the-go work is the support for physical card readers that plug into a mobile device, enabling contactless, chip, and swipe payments upon job completion. This is particularly useful for tradespeople, delivery services, or consultants who finalize transactions at a client's location. Users report that funds are deposited into linked bank accounts within one to two business days, which is a standard timeframe for the industry. The system also allows for basic inventory or service item tracking, so you can quickly add line items to an invoice. While the app is highly reliable, some feedback notes the rare need to restart the app or device to re-establish a connection with the card reader—a minor inconvenience. For the core task of sending invoices and accepting immediate payment in the field, Square Point of Sale provides a streamlined, professional toolkit with transparent, per-transaction fees.