Beta Software

Seisin is provided for testing purposes only. It does not provide legal, tax, or financial advice. Verify all requirements independently. See Terms of Use for details.

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Seisin¶

Rental property management for macOS

A native application for Australian landlords managing a small portfolio. Track rent, record expenses, and stay organised with your tenancy obligations.

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$1,480 Weekly

100% Occupancy

4 Properties

Approach¶

1

For individuals¶

Most property software assumes you're running an agency. Seisin is for people with a few properties who want clarity without complexity.

2

Your data, your devices¶

Everything syncs via iCloud. No external servers, no subscriptions, no third-party access to your records.

3

Australian requirements¶

Australian financial years (July to June), NSW tenancy law compliance, water billing, and expense categories aligned with ATO requirements.

4

Native macOS¶

Not a web app. Native performance, standard keyboard shortcuts, and an interface that follows macOS conventions.

Core functionality¶

Dashboard¶

See what needs attention. Upcoming payments, expiring leases, and scheduled inspections are surfaced automatically.

Overdue payments flagged
Lease renewals shown 60 days ahead
Inspection reminders with NSW compliance

! 2 payments overdue

i Lease expires in 14 days

✓ $8,200 collected this month

Rent and water¶

Create a lease, set rent amount and frequency, and Seisin generates the payment schedule. Record water bills and recharge usage to tenants where permitted.

Automatic payment schedules
Water bill recording and invoicing
Full payment history per lease

1 Jan Paid $1,500

1 Feb Paid $1,500

1 Mar Due $1,500

Financial reports¶

Generate Australian financial year summaries. Income, expenses, and property-level breakdowns for your accountant.

July to June financial year reports
Year-over-year comparison
Occupancy tracking per property

Q1

Q2

Q3

Q4

What you can manage¶

Properties

Address details, photos, notes, and document storage for each property.

Tenants

Contact information, emergency contacts, and lease history.

Leases

Fixed-term and periodic tenancies. Bond tracking. Attached signed agreements.

Payments

Record payments, track balances, handle partial payments. Ledger per lease.

Inspections

Schedule and track property inspections with photos and notes.

Water & Expenses

Record water bills and expenses. Categorise for tax purposes.

Rent Increases

Track rent increase history with effective dates.

iCloud Sync

Data syncs across your devices automatically.

Occupancy

Automatic vacancy detection and occupancy rates per property.

Year Comparison

Compare income, expenses, and returns across financial years.

Get in touch¶

Seisin is a personal project built for my own property management needs. If you're interested in learning more, feel free to reach out.

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