If you're looking for an app to help freelancers manage and track invoices more easily, OTO is a full-featured option. It's a service that handles proposal, contract, invoice, time tracking, expense and client relationship management. OTO can generate proposals and contracts automatically, and it can track hours worked and generate expense reports. It can handle recurring invoices, partial payments and late charges, and it can integrate with Stripe and PayPal.
Another option is Billfy. It centralizes client data and automates recurring charges, so billing is relatively easy. Billfy also offers customizable email templates, customizable reminders and a dashboard to monitor income and business activity. It offers two pricing plans, including a 14-day free trial to let you test it to see if it's for you.
If you're using a Mac, Billie is an intelligent invoice assistant that uses machine learning to automate and process invoices. You can organize invoices with drag-and-drop operations, set filename templates and track suppliers. Billie is designed to save you time and hassle in invoicing processes, so it's good for freelancers and businesses with lots of invoices.
If you need a service that handles multi-currency accounting, Fiskl is worth a look. It's got invoicing, payments, automatic bank synchronization, tax tracking and other features. Fiskl supports more than 170 currencies and can link to more than 1,000 financial institutions for real-time cash flow and financial data. It's good for freelancers and small businesses that want to keep their finances in order.