duplo
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Business accounting software Enter it once. The rest takes care of itself.

Sveska issues invoices and sends them to SEF in one click. Knjiga also imports bank statements and matches payments by itself, while Kancelarija handles inventory, payroll and fixed assets too. No limit on the number of invoices, from 9 € a month billed annually.

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No card needed · Support included · Change plans from within the app

01

SEF both ways

Send and receive e-invoices, with status tracking.

02

E-delivery notes with goods receipts

The full circle: sending, receiving and confirming delivery.

03

No invoice limits

No pricing by document count or per item.

04

Support included

Chat and phone on working days 9–15, with no per-minute charges.

01 / How it works

The journey of one invoice

You enter the invoice once. Everything after that — SEF, payment, bookkeeping and VAT — flows from that single entry, with no retyping.

  1. 01

    Invoice issued

    Pick the customer and items from your lists; a compliant PDF goes to the customer by email from the app.

    All plans
  2. 02

    SEF in one click

    The invoice goes to SEF (the Serbian e-invoicing system) without retyping, and its status — sent, approved, rejected — shows on the invoice itself.

    All plans
  3. 03

    Payment matched from the bank statement

    Import a bank statement: certain payments match themselves, the rest in one click, and the invoice becomes paid.

    From the Knjiga plan
  4. 04

    Journal entry, partner ledger and VAT stay current

    The invoice and payment become journal entries immediately, so at any moment you know who owes you what and how much VAT is due.

    Accounting · Biro
  5. 05

    Your accountant reviews and corrects

    Your accountant works in the same programme: reviews the automatic entries and corrects an account where needed, with no paperwork sent back and forth.

    Accounting · Biro

Steps 4 and 5 need the Accounting add-on with Knjiga or Kancelarija, or the Biro plan. Bookkeeping runs in the background from day one, so an add-on switched on later shows earlier documents straight away.

02 / Features

What duplo does for you

Everything a business needs to run properly — and none of what makes big systems require training.

  • All plans
    01

    Unlimited invoices

    Quotes, proforma invoices, invoices, advance invoices and credit notes — no counting, no surcharges.

  • All plans
    02

    SEF and CRF

    E-invoices go to SEF in one click, with the statuses sent, approved and rejected; for public-sector customers also registration in CRF (the Central Invoice Register).

  • From the Knjiga plan
    03

    Your bank in the app

    Import a statement (XML or PDF) and payments are matched to invoices: certain ones automatically, the rest in one click.

  • From the Knjiga plan
    04

    E-delivery notes and goods receipts

    Sending, receiving from suppliers, confirming delivery and an electronic goods receipt line by line.

  • From the Kancelarija plan
    05

    Payroll and sick leave

    Salary runs, payslips, the PPP-PD tax return as XML for the ePorezi tax portal and sick leave from the eBolovanje portal.

  • Accounting add-on · Biro
    06

    Books that keep themselves

    Every invoice, statement and payslip becomes a journal entry; the partner ledger, statement of open items and trial balance are always current, and your accountant works in the same programme. How an accountant works in duplo →

03 / Plans

A plan by the scope of your work, not by the number of invoices

Everything in a plan is unlimited. The first 30 days are free, no card needed.

Sveska

(Notebook)

For flat-rate entrepreneurs and the smallest businesses

9€

a month, billed annually

  • Unlimited invoices and proformas
  • E-invoices via SEF and CRF
  • KPO ledger kept automatically
  • 1 user
Choose Sveska

Knjiga

(Book)

For small businesses

15€

a month, billed annually

  • Everything in Sveska
  • Incoming e-invoices and expenses
  • Bank statements and payment matching
  • E-delivery notes and goods receipts
  • 2 users
Choose Knjiga

Kancelarija

(Office)

For businesses with employees

23€

a month, billed annually

  • Everything in Knjiga
  • Inventory, work orders and fixed assets
  • Payroll, PPP-PD and sick leave
  • Business trips
  • 3 users
Choose Kancelarija

Biro

(Bureau)

For accountants and agencies

30€

a month, billed annually

  • Kancelarija + Accounting add-on
  • Client companies at 1 € a month
  • Partner ledger, open items and financial statements for every company
  • 3 users
Choose Biro

Prices exclude VAT, per month billed annually. With monthly billing: 10 / 17 / 25 / 34 €. Accounting add-on with Knjiga or Kancelarija: 8 € (9 € with monthly billing). All features on the pricing page →

Would you rather see it first?

Book a free demo — in half an hour we walk through the programme using your own examples.

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04 / Security

Control and security, no small print

  • Sign-in without a password

    A six-digit code by email, valid for five minutes. No password that could leak.

  • Company data kept separate

    Every query is tied to your company, and documents have no public links.

  • Encrypted keys

    SEF and SEO API keys are stored encrypted and never shown to anyone after entry.

  • Roles and history

    Five team roles and a history of every document: who did what, and when.

  • Your data, your export

    Export all your data as XML at any time, even after your subscription ends.

More about security in the documentation →

05 / In more detail

Modules and guides to the regulations

Modules

Guides

All guides →

Your first invoice in five minutes

Open an account and send your first invoice today — 30 days cost nothing.

Try it free for 30 daysor book a free demo