DupProof audits your accounts-payable exports for duplicate and erroneous payments — entirely on your own computer. No ERP connection, no cloud upload, no subscription.
Download the free 14-day trial See pricingBenchmarking research by APQC puts the median duplicate and erroneous payment rate at about 1.5% of disbursements. On $10M of annual supplier spend, that is roughly $150,000 a year paid out twice, keyed wrong, or taxed wrong — most of it never recovered because nobody is looking at the whole ledger at once. ERP duplicate checks only catch exact matches inside one system; the expensive ones are typos, tax variants and vendor-name variants that sail straight through.
Median duplicate/erroneous payment rate (APQC benchmarking, 1,686 organisations).
Duplicate classes detected: exact, typo'd invoice numbers, tax-rate variance, vendor variants, cross-period doubles, separator/padding variants, split-plus-full overpayments.
To audit 200,000 payments on an ordinary laptop. Your full year of AP, checked between sips of coffee.
Every finding shows the two records side by side and the exact rules that fired, in plain language — so a controller can confirm or dismiss it in seconds, and the disposition is remembered on every re-run.
Why flagged: same invoice number · same amount · same day · vendor names are variants of each other. (Real product output format; company and amounts are fictional sample data.)
Export your invoice register and payments from QuickBooks, Xero, Sage — or any system that produces CSV/XLSX. Deliberately no live ERP connection: exports can't leak credentials, and an audit trail should be a snapshot anyway.
Deterministic rules first, fuzzy matching second, everything explainable. Columns map automatically (presets for QuickBooks and Xero; your own mappings are remembered per company).
Work the findings queue: confirm duplicates, mark legitimate payments valid, note vendor contact. Export PDF/XLSX reports — including a per-vendor recovery list — for the file.
Finance data is the crown jewels. DupProof is architected so there is nothing to breach: it runs locally, stores its database on your disk, contains no telemetry and calls no external service — it works on an air-gapped machine. The licence is an offline signed key, not an account. Audit firms and controllers can verify all of this; it is also why there is no per-seat cloud bill.
One-time payment. No subscription, no tiers, no per-seat fees.
Checkout by Polar (secure payment). After purchase, email us your device code and we send your licence key — see how buying works.
No — by design. It works from CSV/XLSX exports. There is no connection to secure, no credentials to store, and no way for your data to leave the machine.
Any system that exports CSV or XLSX. Presets ship for QuickBooks and Xero layouts; other layouts map in under a minute and are remembered for next time.
The app becomes read-only: your data and reports stay fully accessible, nothing is deleted. Activating a licence key restores full use instantly.
No. One payment, perpetual licence for the version you bought, 12 months of minor updates included.
All three — a single self-contained application (~5 MB), no installation wizard, no database server to manage.