Read-only month-end monitoring for Xero

Know when a month you signed off changes in Xero.

Postlock keeps a copy of every balance when you sign off. Each morning it checks those months against Xero, and if anything has moved you get the document, the person and the date.

Read-only. Postlock can never change your Xero data; it only watches and reconciles.
Caught automaticallyPosted 4 days after sign-off · attributed to T. Okafor.
postlock.co/integrity
September 2026Locked · signed offLocked · review compared with live Xero just now
No changes since sign-off1 unacknowledged change since sign-off Clean Action
AccountWasNowMovement
Retained Earnings1,284,500.001,284,500.00-
Document posted after sign-off
TypeRefPostedByAmount
PaymentBACS-4471
Pennine Supplies Ltd
04 Oct 16:22T. Okafor2,000.00

Caught the next morning. Would you have known?

How it works

Three steps. The first takes two minutes.

Close the way you already do, in Xero, Excel or anything else. Postlock only starts at sign-off.

01 · SIGN OFF

Lock the month

Pick the month you've signed off and lock it in Postlock, even weeks late. It keeps a copy of every balance, and of the documents behind them.

02 · WATCH

Checked every morning

Each morning Postlock compares your signed-off months with Xero, read-only. A Xero lock date stops some edits; it doesn't tell you when one gets through.

03 · TOLD

What moved, and who

The line, the old and new value, the document that moved it, who posted it and when. Fix it in Xero, or accept it with a reason that stays on the record.

Check my closed months · free
Who it's for

Built for the person who signs the numbers.

Finance managers & CFOs

You signed the pack; Postlock tells you if it stops being true. And you can actually buy it: the tools that do anything comparable are sold to practices by the client book, with a minimum of ten clients. One company isn't a client book. We sell to you.

For finance teams
Accountancy practices

Every client's filed year-end against Xero today, on one screen. Chase the 3 clients that moved, not the 200 that didn't.

For practices
The bonus

An Excel pack that's yours to keep.

Cover, balance sheet, reconciliations with your notes, supporting schedules with live formulas, and a log of every change since sign-off. A working-paper file your auditor can use, and it keeps working whether or not you stay subscribed.

In every pack
Each balance carries a note written once and carried forward every month: "Rent deposit on the Leeds unit, returned at lease end. Not a prepayment, don't amortise." No balance is ever a mystery again.
A note from the founder

"I'm a finance manager, and I sign off month-ends myself. Once the accounts go out, nothing in Xero tells you when a number in a closed month quietly changes; you find out at year-end, or when someone else does. Postlock is the tool I wanted on my own desk."

The founder · Postlock · talk to me directly

Safe to try
Read-only: Postlock can never change your Xero data. No AI reads your ledger. Solo is £39 a month after a 14-day free trial, no card needed, and everything it produces is yours to keep. See pricing
Find out for free. No card.

Create a free account, connect Xero read-only and check your last 6 closed months in one pass. Prefer to look around first? The demo company needs no sign-up.

Read-only Xero connection Never writes to your ledger No lock-in · leave and take everything
Check my closed months · free