Keystone is built for portfolio landlords with 5–20 properties. Not a tracker. Not a spreadsheet upgrade. A financial intelligence layer — stress testing, DSCR, LTV, loan modelling — built around the decisions that actually move the needle.
Free to start. No card required.
Every tool built for landlords was built for the accidental ones. Two flats, one spreadsheet, a letting agent doing the rest.
If you've got 5, 10, 15 properties — mortgages across multiple lenders, LTV shifting as you refinance, capital decisions compounding in the background — you need something built to match how you actually think.
That's Keystone.
Model debt service coverage across every property. Stress test your portfolio against the rate scenarios you choose. Know which assets are working — and which are quietly undermining your next deal.
Track every fix expiry. Model LTV shifts after remortgages. See which product transfer unlocks capital for your next acquisition — before you sit down with your broker.
Stop stitching five tools into a picture that's already out of date. Properties, mortgages, cashflows, yield — one structured view. Spend less time assembling data and more time deciding what to do with it.
“I built Keystone because I was a portfolio landlord using a spreadsheet I was embarrassed by. Every tool I tried was built for letting agents or accidental landlords with two flats. Nothing existed for someone who thinks in LTV, DSCR, and five-year capital plans. So I built it.”
No teams tier. No enterprise packaging. No feature bloat built for letting agents. Keystone is a capital intelligence tool for portfolio landlords who think in LTV, DSCR, and five-year plans — and want software that thinks the same way.