Saved calculations
--Waiting for session
User-Trusted By Design
Built for users who need transparent software outputs they can audit
PropertyCost combines transparent math, stress-tested scenarios, and account-level history so users can inspect informational software outputs, understand why they changed, and run the next in-app test.
Trust Signals
- Transparent formulasNo black-box software outputs
- Scenario contrastMeaningful input deltas
- Personal workspaceSaved baseline + history
- Risk-first framingStress and downside visible
Live Product Signals
Your trust dashboard on this page
If you are logged in, these blocks pull your latest activity in real time. If not, you see guest mode values.
Calculator coverage
--Across all supported models
Last activity
--Most recent run timestamp
Scenario pack quality
--Generated vs requested in latest pack
Output readiness
--Data depth for compare/optimizer
Account mode
GuestLogin unlocks personalized trust signals
Methodology
How a result becomes a trusted informational software output
Deterministic compute layer
Every calculator uses explicit formula logic by type, with strict input validation and stable output fields.
Scenario and stress exploration
The engine probes user-controlled levers, applies stress cases, and removes weak or duplicate outcomes.
Informational output layer
Software outputs and deep dives are anchored to payload metrics, not freeform speculation, and always map to next runs.
Trust Architecture
Security, data handling, and operational accountability
Security
- Server-side session checks for protected endpoints.
- Role and ownership checks before returning account data.
- Rate limits on premium actions to reduce abuse.
Data Handling
- Calculation payloads are stored per user with clear ownership boundaries.
- Cached premium outputs use scoped keys by user and context hash.
- Export/report generation uses the same trusted result source.
Method Integrity
- Primary metric by calculator type drives compare and optimizer outputs.
- Derived metrics and missing checklists are generated consistently per model.
- Scenario ranking balances impact, simplicity, and baseline improvement.
Roadmap
- Stronger benchmark packs for edge-case markets.
- More visual explanation layers in Account deep dive.
- Expanded reliability telemetry for user-facing trust diagnostics.
What Users Can Verify
Nothing is hidden behind "just trust us"
- Input changes are displayed next to each scenario.
- Result deltas are shown against the baseline run.
- Mini informational output and deep-dive stay consistent with the same payload.
- Portfolio and compare views reuse the same calculator logic.
Important Note
Responsible use
PropertyCost provides informational software outputs, not legal, tax, or financial advice. Final decisions should include professional review and local market due diligence.