Problem & idea: Couples often struggle to keep track of joint spending that happens on separate cards / accounts. Reddit threads show people asking for a tool that (a) lets partners see all spending, (b) split who-paid, (c) keep a running budget, and (d) talk about a purchase. The proposed twist is an e-mail/receipt inbox that auto-forwards purchase confirmations, then categorises and shows them inside the shared budget, with chat on each item.

Evidence of search demand (keyword tool):

• “budgeting app for couples” – 1 600 global monthly searches, SEO difficulty 23 (low–med). CPC $7.85 (commercial intent).
• “best budgeting app for couples” – 720 searches, difficulty 22, CPC $8.68.
• “free budgeting app for couples” – 210 searches, difficulty 19. => Primary keyword easily clears the 500-search / <30 difficulty bar.

Forums & social proof:

• r/personalfinance – multiple posts in the last year: 32 upvotes/40 comments (Sept ’24), 31 upvotes/42 comments (Nov ’24), asking exactly “What budgeting app works for couples?” Comments mention YNAB, Monarch, Honeydue but complain about missing features like receipt attachment or automatic split.
• r/iosapps post supplied by user (June ’25)...