From an invoice to a change you can act on.

Keep the original invoice, check uncertain details, and compare equivalent products using consistent units.

Illustrative sample · fictional supplier and invoices

01 · Add the original invoice

Upload a PDF or a clear invoice image. If your workspace inbox shows receiving is ready, you can also forward an email with invoice attachments.

Sample invoice · Garden Produce · 2 October 2026 · USD

Tomatoes · 2 cases, 5 kg each

$22.00 per case × 2 = $44.00 product subtotal

No tax or adjustments in this example. Invoice total: $44.00.

02 · Check what needs review

Costlr extracts supplier details, dates and line items, then checks the arithmetic. Uncertain amounts, package sizes or product matches go to Review. Compare them with the original before finishing the invoice.

Here, you confirm that “TOM 5KG” means the same tomatoes you bought previously, with 5 kg in each case. Confirmed mappings help recognize future repeats; uncertain matches still need attention.

03 · Compare a consistent unit price

The case price becomes $22.00 ÷ 5 kg = $4.40/kg. Comparisons use compatible supplier, product, currency, unit and location records from earlier purchase dates.

Sample history · same supplier and location · USD
Purchase date	5 kg case	Unit price
25 September 2026	$20.00	$4.00/kg
2 October 2026	$22.00	$4.40/kg

04 · See the change and its source

Tomatoes · Garden Produce

↑ 10% increase

$4.00/kg → $4.40/kg · $0.40 more per kg

On this 10 kg purchase, the increase adds $4.00 compared with the previous unit price. This is recorded-purchase context, not a savings claim or a forecast.

Changes and product history link back to the source invoice. First purchases and ambiguous baselines show no comparison rather than a guessed change.

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