Time Tracking & Invoicing Software

I've been using Billings Pro for years to track client/project info, time, and invoicing. It has many great features from server backup/syncing across devices, activity-aware timers, taxes, discounting, markups, invoicing, reporting, and so much more. Like many other applications that are geared toward small businesses or one-man shops, they either go out of business or fail to support their apps as OS updates roll out, leaving users with the sinking feeling that one day the app will no longer open after an OS auto-update. After many years of client info invested in this platform, the writing is on the wall as funky little things are happening after the Tahoe update since they stopped support 1-2 years back. It would be great if an established company like Adobe could develop their own project tracking, timing, and invoicing software that seamlessly integrates with Creative Cloud apps. An additional subscription would not only generate profits for Adobe, but make customers more confident that the product will stick around for years to come, with updates occuring in tandem with other creative cloud apps and OS updates.  I'm currently paying $99/year and would be happy to pay that or more to have this add-on service, perhaps with tiered pricing based on features, number of clients/invoices generated per month, etc. Even an integrated payment system would be amazing so clients can have options on how to pay. If there are other dependable options creatives use, would love to hear some app names.