Powerfully Simple Invoicing

Native on Mac, Windows & Linux

Native desktop experience on Windows, macOS, and Linux. Work how you want, wherever you are, with a single, consistent interface.

Effortless Compliance

Automatically embed machine-readable data (like ZUGFeRD or XRechnung) into your PDF invoices. Get ready for mandatory EU e-invoicing today.

Designed for Speed

Forget bloated web apps. As a native Desktop app, Invoicer starts instantly and runs at full speed. No browser tabs, no lag. Focus on your work, not your loading screen.

Built for Privacy-First

Why upload your sensitive financial data to a cloud you don't control? Invoicer is built on an 'offline-first' principle. Your clients, your invoices, and your revenue numbers never leave your computer unless you decide to send them. It's the perfect solution for lawyers, consultants, and anyone who takes data privacy seriously.

Audit-Proof & Cloud-Free Archive

Why pay for "Service WORM" subscriptions? We implemented a native "Write-then-Lock" archive that makes your invoices immutable the moment they are finalized. Enjoy full, revision-safe WORM storage that runs 100% offline and stays under your control.

Built for GoBD-Friendly Bookkeeping

Invoicer helps you work in a way that supports GoBD-style record keeping: invoices stay on your machine, changes are transparent, and exports are under your control. Your tax advisor gets clean, well-structured data.

Complete Feature List

Core Invoicing & Quotes

Professional invoices and quotes – Create, manage, and send invoices, quotes, and credit notes with customizable templates
Quote-to-invoice workflow – Convert accepted quotes directly into invoices with one click
Flexible line items – Add products, services, or custom line items with individual tax rates and discounts
Multiple tax rate support – Handle different VAT/tax rates within a single document, including reverse charge scenarios
Early payment discounts (Skonto) – Offer percentage-based discounts for early payment to improve cash flow
Pro Send customer emails from the app – Send emails to customers (e.g., invoice/quote delivery) directly from within the application

Legal Compliance & Security

WORM storage (Write-Once-Read-Many) – Published invoices are immutable for legal compliance and audit trails
Cryptographic verification – Every published document includes SHA-256 hashes for tamper-proof verification
Electronic invoices – Generate XRechnung and ZUGFeRD formats for German B2G and B2B e-invoicing requirements
Legally compliant corrections – Issue proper correction invoices (Stornorechnungen) that maintain audit trails
Document state tracking – Complete lifecycle management from draft through published, paid, and archived states
Pro S3 Object Lock WORM archive – Use any S3 provider for immutable storage (Object Lock) aligned with GoBD requirements

Payment Management

Partial payment tracking – Record multiple payments against a single invoice with automatic balance calculation
Payment status overview – Visual indicators show unpaid, partially paid, and fully paid documents at a glance
Payment reminders – Track overdue invoices and manage reminder workflows

Time & Billing

Timesheet management – Track billable hours with start/end times, hourly rates, and descriptions
Convert timesheets to invoices – Automatically generate invoices from selected timesheet entries
Flexible time tracking – Track time by project, client, or custom categories

Multi-Tenant & Client Management

Multiple business entities – Manage several businesses or freelance identities from one application (multi-tenant support)
Multi-user & roles – Create users with roles and restrict access to app features based on the logged-in user
Complete client database – Store client contact details, billing addresses, and tax information
Client-specific settings – Set default payment terms, tax handling, and other preferences per client

Products & Services Library

Product catalog – Pre-define your services and products with standard prices and descriptions
Quick line item entry – Add frequently used items to invoices with just a few clicks
Consistent pricing – Maintain standard rates across all your invoices

Customization & Branding

Custom templates – Personalize invoice appearance with your logo, colors, and layout (PDF/HTML templates)
Flexible numbering schemes – Configure invoice numbering patterns and sequences per tenant
Multilingual application – Interface and invoice documents available in English and German
Multiple customer currencies – Create invoices in different currencies – ideal for freelancers, designers, and other knowledge workers with international clients
Currency formatting – Locale-aware number and currency formatting

Dashboard & Reporting

Business overview dashboard – See key metrics including outstanding amounts, recent documents, and payment status
Filtered document views – Quickly find documents by status, client, date range, or type
Financial insights – Track your revenue and outstanding receivables at a glance

Usability & User Experience

Desktop application – Native performance with offline capability (Kotlin/Compose Desktop)
Responsive design – Adapts to different window sizes and screen resolutions
Dark mode – Easy on the eyes with automatic or manual theme switching
Intuitive interface – Clean, modern UI following Material Design 3 principles
Smart workflows – Context-aware actions and validation prevent common mistakes

Data Management

Local data storage – Your data stays on your computer with SQLDelight database
Fast search and filtering – Quickly locate any document, client, or transaction
Data integrity – Built-in validation and error handling protects your business data
Ultimate Client-server mode – One server, multiple clients with offline-capable data mirroring

What Makes Us Different

Built for compliance – Designed specifically for German tax and invoicing requirements (GoBD-compliant approach)
Audit-ready – Cryptographic hashes and immutable records ensure your books can withstand scrutiny
No subscription lock-in – Desktop application with local data storage
Privacy-first – Your financial data never leaves your computer