Best rental income tracker for vibe coders

The rental property management and income tracking space has roughly 60-80 established apps ranging from heavy enterprise solutions (AppFolio, Buildium) to lightweight spreadsheet templates, with maybe 15-20 tools claiming to be 'simple' or 'indie-friendly.' The common failure pattern is bloat: these tools cram in tenant management, maintenance requests, compliance tracking, and accounting integrations when most indie property owners just need clean income tracking, expense categorization, and tax-ready reports. The actual gap isn't in features—it's in philosophy. There's no tool built specifically for vibe coders who own 1-5 rental units, value design and UX over feature lists, and want something they can set up in 30 minutes and check monthly. The opportunity sits in the intersection of minimal, beautiful UX and real domain expertise in rental accounting. A new vibecoder entering here should focus on: (1) dead-simple dashboard showing YTD net income and upcoming rent, (2) one-click expense logging that auto-categorizes (or learns to), (3) export-to-accountant features that actually work with tax season, and (4) pricing under $10/month. The market rewards specificity here—go narrow on the 1-5 unit owner, not the 50-unit landlord.