An accounting and bookkeeping app, Quickbooks keep your accounts nice and safe and in the cloud. List expenses, make personalised invoices and quotes, schedule payments (even recurring ones) and shares all information with your accountant, if you so choose. Clear and simple graphics show you how your cashflow is progressing. This app will keep up with your tax returns in most countries, from the US to Europe, and you can always try it out for free first. The subscription fee is very low. Which makes this one of the best accounting apps available.