I use https://www.xero.com https://www.xero.com. My accountant can manage my accounts via their Xero login too which is handy. Many of these platform have APIs

I use https://www.xero.com https://www.xero.com. My accountant can manage my accounts via their Xero login too which is handy. Many of these platform have APIs you can use. I've created a few products off the back of them through tools I'm built for myself internally. - https://www.inviewapp.com https://www.inviewapp.com | Creates iCal feeds for your invoices and bills so you can see who owes what on your calendar (or in Slack). Works with most major invoicing platforms. - https://www.quikk.co.uk https://www.quikk.co.uk | Backups and audits all your Xero data. I'm sure you'd find neat ways to automate your workflow with whichever platform you end up opting for.