Create a VAT-ready PDF invoice in under a minute, email it to your client, and let OPSKAP track paid, unpaid and overdue for you.
OPSKAP OS is invoice management software for small businesses, freelancers and agencies. Every invoice is auto-numbered, VAT is calculated after discounts (the way tax offices expect), and the PDF carries your logo and brand colour. Send it by email straight from the app, share a public payment page, or download the PDF — your client never needs an account.
Outgoing and incoming invoices live side by side: who owes you, whom you owe, and what is overdue. Recurring invoices are recreated for you each month, ready to review and send, and overdue reminders go out automatically — so chasing money stops being your job.
Auto-numbering, VAT after discount, your logo and colours. EUR, USD, GBP, AED, SAR, QAR and more.
Monthly retainers are recreated automatically, ready to review and send. Duplicate any invoice in one click.
Paid, sent, overdue — always visible. Automatic email reminders chase late payers politely.
Send invoices by email or share a public page where clients can copy payment details in one tap.
Drop a PDF of an incoming invoice — OPSKAP reads the vendor, amount, date and VAT and fills the form for you (Pro Solo and up).
How it works
Name, registry code, bank details — once. They appear on every invoice automatically.
Pick a client, add lines, set VAT. The PDF is ready in under a minute.
Email it, track the status, and let reminders handle the chasing.
Common questions
Yes — EUR, USD, GBP, AED, SAR, QAR and more, with honest conversion to your base currency in statistics.
Invoices carry sequential numbers, VAT breakdowns, registry codes and payment details — the fields EU tax offices expect.
Yes: 1 company and 5 invoices per month, free forever. Paid plans start at €14/month.
Upload a PDF of a received invoice and the fields fill themselves — vendor, amount, date, VAT. Free plan includes 3 captures a month to try it; Pro Solo includes 100.
More on the product page and in the FAQ.
Free forever plan · 14-day full trial · no credit card.
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