Invoicing and Document Workflows, Made Simple

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.

E-Invoicing and Compliance Support

Depending on the use case, create ZUGFeRD invoices as PDF/A-3 files with embedded structured data or XRechnung invoices as structured XML files. Prepare your workflows for the e-invoicing requirements that apply in Germany.

Pro Incoming Document Workflow

Capture, review, approve, dispute, archive, and track supplier documents with PDFs, XML files, and attachments kept together in one structured workflow.

Ultimate AI-Assisted Document Analysis

Use local or remote AI endpoints to extract invoice data, match suppliers, and suggest expense categories while keeping every suggestion under your control.

Ultimate Client-Server for Teams

Run one host with multiple desktop clients so teams can work across several workplaces while the host database remains authoritative.

Designed for Speed

Invoicer is a native desktop application without a browser runtime, designed for short startup times and responsive interaction.

Built for Privacy-First

In standalone mode, Invoicer stores your business data locally; in client-server mode, it is stored on your self-hosted server. External services are used only when you deliberately configure or trigger them.

Traceable Archive: Local or S3

Archive finalized documents with protection against later changes: locally with file-system protection, or in Pro with S3-compatible Object Lock and compliance-mode retention.

Built for GoBD-Friendly Bookkeeping

Invoicer supports GoBD-style record keeping with local standalone storage or a self-hosted server, transparent changes, and exports 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

Incoming Documents & Purchase Workflows

Pro Incoming document workflow – Capture, review, approve, dispute, reject, archive, and track payment status for supplier invoices and other incoming documents
Pro Multi-file document intake – Keep PDFs, XML files, and supporting attachments together as one incoming document
Ultimate AI-assisted analysis – Extract invoice data, match suppliers, and suggest expense categories using local or remote AI endpoints
Pro In-app e-invoice review – View structured e-invoice data next to the PDF for ZUGFeRD, XRechnung, and related UBL/PEPPOL variants
Pro Suppliers and expense categories – Maintain supplier master data and user-managed expense categories for cleaner purchase classification
Pro Duplicate detection and attachment handling – Detect repeated imports earlier and move attachments through staging, archive, and rejection flows more reliably

Traceability & Security

Protected local archiving – Published invoices are protected locally against unintended later changes and remain traceable in audit trails
Cryptographic verification – Every published document includes SHA-256 hashes for tamper-evident checks
Electronic invoices – Generate XRechnung and ZUGFeRD formats for German B2G and B2B e-invoicing requirements
Traceable corrections – Issue 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 S3-compatible storage for immutable archiving with Object Lock and compliance-mode retention
Automatic database backups – Regular backups of your database keep your business data safe and recoverable
Pro Encrypted backups – Secure your backup files with industry-standard AES-256 encryption

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 standalone storage – In standalone mode, Invoicer stores your data locally in a 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 host, multiple desktop clients, synchronized local mirrors, and Host API support for distributed work

What Makes Us Different

Built for compliance-oriented workflows – Designed specifically for German tax and invoicing requirements (GoBD-oriented approach)
Review-friendly records – Cryptographic hashes and protected records help make documents easier to review
No subscription lock-in – Desktop application with local or self-hosted data storage
Privacy-first – Local storage in standalone mode or storage on your self-hosted server in client-server mode