Mobile Dog Groomer Management App

I need a private, cross-platform app—running smoothly on both iOS and Android—that helps me run my mobile dog-grooming business without relying on half-fit generic tools.

Core deliverables
• Calendar: I have to be able to create, edit and delete appointments, and quickly see them at a glance thanks to colour-coded events.
• Finance tracker: every job or purchase must capture Date & Amount, Category, Payment Method and VAT, then export to a clean .xls sheet whenever I request it.
• Client database: a simple, searchable list of owners and their pets that I can update on the road.

I’m happy for you to pick the most efficient stack—Flutter, React Native or another proven cross-platform framework—as long as the final build is stable and easy for me to install directly on my own devices. Clear, tidy UI and straightforward navigation are a priority; no extra bells and whistles are needed beyond what’s outlined above.

Please include a short note on how you plan to handle data storage and the .xls export when you reply, plus an estimated timeline for a tested, ready-to-install release.