Built by Pyalm
Pyalm Books gives you the evidence an auditor asks for in one place — a double-entry ledger, manual journals, period locking, bank reconciliation, receivables ageing and VAT returns. Free while in beta.
Paste your purchase ledger, payment run or expense list. The tool groups entries with the same amount that fall within your date window and share a vendor or reference, and totals the money at risk.
Paste your payment run, purchase ledger or expense list. Amount is required; the other columns tighten the match.
Pyalm Books gives you the evidence an auditor asks for in one place — a double-entry ledger, manual journals, period locking, bank reconciliation, receivables ageing and VAT returns. Free while in beta.
Duplicate payments come from an invoice entered twice, a re-sent PDF, a corrected invoice with a new number, or a statement paid on top of invoices. System controls catch exact repeats of supplier and invoice number; they miss near-duplicates such as GS-1042 and GS-01042, or the same amount paid twice a week apart.
A narrow window with the vendor required finds the likeliest duplicates. Widen the window or drop the vendor rule to find re-keyed payees. Reference numbers are normalised so leading zeros and punctuation do not hide a match. Each flagged group should be agreed to source documents — fixed recurring payments such as rent legitimately repeat.
📖 Read the full guide: How to Find Duplicate Payments and Invoices
Test a ledger for unnatural first-digit patterns — with chi-square, MAD and per-digit z-scores.
Find missing and duplicated invoice, credit note or voucher numbers in a list.
Match a bank statement against your ledger and list what's unmatched on either side.
Only an amount is required. Adding a date, vendor and reference tightens the match and reduces false positives.
For each group it counts every copy after the first at the group's amount. It is an upper bound until you confirm which entries are genuine.
Amounts are compared by absolute value, so a credit note equal to an invoice would group with it. Review those pairs — they may be legitimate reversals.
