One workspace · five superpowers
From scattered tools to one source of truth
Not features for the sake of it — outcomes you feel every week.
Branded invoices, sent by email, marked paid, recurring — with VAT and discounts done right, in EUR, USD, GBP, AED, SAR, QAR and more.
Contracts, IDs and compliance files in private, searchable storage — the right file is always one search away.
Receivable, payable, overdue and cashflow — across every company you run, in a glance.
Most tools stop when the invoice is sent. OPSKAP runs the whole operation.
A typical invoicing tool
OPSKAP OS
Four steps from chaos to control — keep scrolling.
Professional invoices, your documents and clean cashflow — without the bloat. Free forever, ready to grow into multiple companies.
OPSKAP OS is the operational center for small business: invoice management with VAT-ready PDFs and recurring billing, money in and out tracked straight from your invoices, document storage for contracts and compliance, client management and multi-company workspaces — one calm, minimal tool instead of five tabs and a folder called “FINAL_v2”.
Built for freelancers, consultants, agencies and founders running several legal entities across Europe, the Gulf and Asia: multi-currency invoicing in EUR, USD, GBP, AED and more — EU-hosted and GDPR-first. Not an ERP, not accounting software: the daily operating system that keeps a business out of chaos.
Create and send VAT-ready PDF invoices, automate recurring billing, see money in and out across your invoices, store contracts and manage clients — invoicing software for freelancers, agencies and multi-company founders. Start free, no credit card; every new account gets 14 days of full Team features.
Monthly or annual — annual billing saves you two months. Why paid? No ads, no selling data — subscriptions fund EU hosting, backups and support. Full comparison and the monthly/annual switch on the pricing page. Downgrades never delete your data.
From the founder
“I ran companies in four countries — and every one of them lived in Excel, Telegram and a folder called NEW_FINAL2. OPSKAP is the tool I needed for three years: one calm place that shows who owes you, what’s due, and where the papers are. If it saves you one lost invoice, it has already paid for itself.”
R.T. — founder, OPSKAP OS · Tallinn, Estonia · the story →
Short answers. Longer ones on the FAQ page.
OPSKAP OS is a small business operating system — invoicing software, document management, a lightweight client base and cashflow tracking in one minimal workspace. Built for freelancers, consultants, agencies and founders running one or several companies.
Yes. The Free plan includes one company and 5 invoices per month, forever. Every new account also gets a 14-day trial with full Team features — no credit card required.
Yes. Multi-company management is the core of OPSKAP OS: Pro Solo covers 2 companies, Team covers 5, Business Pro covers 15 — separate legal entities, documents, clients and finances with one dashboard on top. Ideal for e-Residency founders and agency owners.
No — and it isn’t meant to. OPSKAP OS gives you operational cashflow visibility: who owes you, what you owe, what’s overdue. Your accountant keeps doing the books; you finally see the whole picture daily.
Yes. Data is stored in the EU with encryption at rest and in transit, row-level security and private document storage. You can export or delete your data at any time.
Set up your first company and send an invoice in under five minutes.
Get started free