Seisin¶
Property management, refined.
A native macOS application for Australian landlords who value simplicity over complexity. Track rent, manage leases, and stay organised—without the enterprise bloat.
A different approach¶
Built for individuals¶
Most property software assumes you're running an agency. Seisin assumes you're a person with a few properties and a life outside of spreadsheets.
Your data stays yours¶
Everything syncs via your iCloud account. No servers to trust, no subscriptions to forget, no company policies to worry about.
Built for Australia¶
Australian financial years (July–June), NSW tenancy law compliance, water billing, and expense categories that match ATO requirements.
Designed for macOS¶
Not a web app in disguise. Native performance, native keyboard shortcuts, native aesthetics. It feels like it belongs on your Mac.
Everything you need, nothing you don't¶
Dashboard at a glance¶
See what matters today. Upcoming payments, expiring leases, scheduled inspections—all surfaced automatically. No digging through menus.
- Overdue payments highlighted immediately
- Lease renewals flagged 60 days ahead
- Inspection reminders with NSW compliance
Rent and water billing¶
Create a lease, set the rent and frequency, and Seisin generates the schedule. Record water bills from your supplier and recharge usage to tenants where permitted.
- Automatic payment schedule generation
- Water bill recording and tenant invoicing
- Full payment history per tenant
Reports for tax time¶
Generate Australian financial year summaries with a few clicks. Income, expenses, and property-level breakdowns ready for your accountant.
- Financial year income reports (July–June)
- Expense categorisation for ATO
- Property performance comparisons
Complete property management¶
Properties
Address details, photos, notes, and document storage. Everything about a property in one place.
Tenants
Contact information, emergency contacts, lease history. Keep tenant records organised.
Leases
Fixed-term and periodic tenancies under NSW law. Automatic rent schedules. Bond tracking with NSW Fair Trading.
Payments
Record payments, track balances, handle partial payments. Full ledger for each lease.
Inspections
Schedule and track property inspections. Attach photos and notes. NSW law limits routine inspections to four per year.
Water & Expenses
Record water bills and generate tenant invoices. Log council rates, strata levies, repairs, and other costs. Categorise for tax time.
Rent Increases
Record rent increase history with effective dates. NSW requires 12 months between increases for periodic tenancies.
iCloud Sync
Your data syncs automatically across your devices. No manual backups needed.
Interested in Seisin?¶
This is a personal project built for my own property management needs. If you're interested in learning more or trying it out, feel free to get in touch.