Mobile App Needed for Wedding Budget Planning by Category

We are planning our wedding and want a mobile application that keeps the entire budget under control instead of scattered spreadsheets and notes. The idea: a couple enters the total amount they are ready to spend on the wedding, then splits that sum across major categories such as venue, catering, outfits, and photo-video. Each category should show the planned amount, how much has actually been paid, and how much is still available.

We also need per-vendor tracking inside each category, since a single category can include several contractors. Every vendor needs a card with the agreed price, any deposit already paid, upcoming payment dates, and the remaining balance. The app should warn us when a category is close to its limit or a payment deadline is near, and a simple chart of the whole wedding budget would help us see where the money goes at a glance.

Please build this for both iOS and Android with clean, pleasant visuals suitable for wedding planning, offline access to already entered data, and an option to export a short summary report. Share your experience with budgeting or finance apps, a rough timeline, and how you would structure the category and vendor data.

What matters most:
— total budget split by category
— vendor cards with deposits and balances
— payment reminders and limit alerts
— exportable summary and simple charts