Landlord Notebook - Rental Management App That Makes Tax Filing Easy

■ Development Background and Concept
"Making personal landlord income and expense management simpler and more self-contained."

For individual landlords who manage rental properties such as apartments and condominiums, monthly tasks such as confirming rent deposits, breaking down principal and interest on loan repayments, and calculating management company delegation fees represent a significant burden.
Traditional handwritten notebooks and spreadsheet software require manual data entry each month, while large-scale cloud management tools designed for real estate professionals come with high fixed monthly costs and overly complex features for small-scale operations.
"Ooyasan Note" was developed so that anyone can easily and accurately grasp their monthly cash flow using just a single smartphone in their hand, without confusion.

■ Main Features of "Ooyasan Note"

1. Automatic posting of rent, loans, and delegation fees significantly reduces input workload
   Based on conditions set for each property (rent, repayment amount and interest rate, management delegation fee rate, etc.), monthly income and expenses are automatically calculated and posted. There is no need to manually enter the same figures each month, preventing record omissions and entry errors.
2. Secure design with no server required—everything stays on your device
   Important financial data and property information are safely stored only within your smartphone. There is no need to entrust personal financial data or asset information to cloud servers, so you can use the app with peace of mind regarding privacy. It operates smoothly even in offline environments without network coverage.
3. Flexible contract and history management
   Supports registration of multiple properties, from a single condominium unit to an entire apartment building. Historical changes such as management company switches, fee revisions, and loan condition modifications are accurately maintained by period, allowing smooth retrospective income and expense verification.

■ Use Cases
・Monthly income and expense checks for individual and side-business landlords: For confirming monthly rent deposits and cash flow after loan withdrawals.
・Preparation for tax filing: Quickly organize annual income and expense trends within the app and export as CSV, reducing the burden of filing procedures.
・Distributed management of multiple properties: For comparing and understanding profitability and repayment status by property.

■ Pricing Structure
・Free Plan: ¥0 (up to 1 property registration, with basic features including automatic income/expense posting and history management)
・Premium Plan: ¥780/month (unlimited properties, CSV export for tax filing, blue return settings, depreciation estimation, various analysis graphs, balance sheet, etc.)

■ App Overview
・App Name: Ooyasan Note
・Compatible OS: iOS / Android
・Price: Free with basic features (subscription option at ¥780/month)
・Official Website: https://ajisai-ap.com/