BillingEngine

BillingEngine is cloud invoicing and accounting software for freelancers and small businesses. It is a strong fit for those who need structured German e-invoices, recurring document workflows and accounting exports without paying for unlimited volume from the outset. Its main trade-off is clear: free and Basic plans cap monthly invoices, quotes and receipts.

Overview

BillingEngine supports ZUGFeRD and XRechnung e-invoices compliant with EN 16931, along with tax validation. Accepted quotes can turn into invoices, and reminders can be sent at several dunning levels. Together, these features cover a useful stretch of routine billing, particularly for businesses that need compliant e-invoices rather than only conventional PDFs.

Receipt recognition extracts the amount, date, tax rate and supplier, then matches the receipt to an expense. Every plan also includes an unlimited email inbox for incoming e-invoices, so receiving them does not use up the monthly document allowance. Exports in DATEV, CSV, XLS, XML and PDF are available on all plans; the pricing page also lists a REST API for customers, invoices and payments.

BillingEngine says data is encrypted in transit, stored on servers in Germany and archived in a GoBD-compliant manner. For AI receipt recognition, it says the document is sent encrypted to OpenAI, is not used to train AI models, and remains on its Frankfurt server. Those assurances may matter to businesses processing financial records, though they do not replace an assessment against a company's own data requirements.

Key features

• E-invoices: ZUGFeRD and XRechnung support compliant with EN 16931, plus tax validation, make the product relevant to businesses handling structured German e-invoices.
• Quotes and reminders: Accepted quotes can become invoices, while reminders support several dunning levels. This links sales estimates and follow-up to everyday billing.
• Receipt capture: Recognition pulls key fields from receipts and matches them to expenses, reducing manual entry in that workflow.
• Incoming invoices and exports: The inbox is unlimited on every plan, and multiple export formats support accounting handoff and record keeping.
• API: A REST API for customers, invoices and payments gives businesses an integration route beyond file exports.

Pricing

The Free plan costs nothing, billed monthly. It allows one user and up to 3 invoices, 3 quotes and 3 receipts per month. This is enough to assess a low-volume workflow, but the tight caps make it a poor fit once billing activity grows. Incoming e-invoices remain unlimited.

Basic costs €6 a month, billed plus VAT. Its allowance rises to 30 invoices, 30 quotes and 30 receipts monthly, with two users. It is the practical step up for a small operation that can forecast its document volume; it still has a hard ceiling and is not the choice for unpredictable or higher-volume billing.

Premium costs €12 a month, billed plus VAT. It removes the invoice, quote and receipt limits and allows five users. That makes it the clearest option for growing businesses that want predictable capacity, though businesses needing more than five users should check fit before committing. Priority email support is a plan feature, with requests often answered the same business day.

Platforms

BillingEngine is a cloud service available through the web and an API. The API provides a route for working with customers, invoices and payments; the web offering serves direct use without self-hosting.

Who it's for

Freelancers and small businesses that need compliant e-invoices, quotes, reminders, receipt capture and accounting exports are the natural audience. Free suits very low monthly volume, Basic suits modest and predictable volume with a second user, and Premium fits teams that need unlimited documents within a five-user plan. It is less suitable for businesses whose user count exceeds that limit or whose needs go beyond the invoicing and accounting workflows described.

Pros and cons

• Pros: ZUGFeRD and XRechnung support with EN 16931 compliance and tax validation serves structured e-invoicing needs.
• Pros: Unlimited incoming e-invoice email and exports in five formats are included even on Free, preserving useful workflows despite its caps.
• Pros: Quotes, reminders and receipt recognition bring several routine document tasks into one product.
• Cons: Free permits only three invoices, quotes and receipts each month, so it is quickly outgrown by active businesses.
• Cons: Basic remains limited to 30 of each document type monthly; Premium is required for unlimited volume.
• Cons: Premium supports five users, which may not accommodate larger teams.

Alternatives

For an app-centered option with Peppol e-invoice sending and a free tier limited to sales invoices, consider Billit; its free license is described as limited in functionality, and a separate plan is priced at €690 a month for up to 25 documents. For developers who want an open-source library rather than a hosted invoicing product, phase4 is Apache 2.0 licensed and requires manual integration. Holodeck B2B is another free open-source option, under GNU GPL 3, requiring Java runtime 11 or later.

B2Brouter may suit businesses with modest transaction needs: its free Basic plan allows up to 10 contacts, 24 transactions per year and one user. For a downloadable sample implementation under the European Union Public Licence, consider Domibus. ONESOURCE Pagero is another option, offered by Thomson Reuters. PeppolSoft offers a free Buyer plan with receiving through its portal and app; ERP integration is subject to budget approval. Tradeshift has a free tier covering up to 30 invoices per quarter.

Browse more options in Electronic Invoicing Software and Invoicing software.

Verdict

Choose BillingEngine if your freelance business or small company needs structured German e-invoices, practical quote-to-invoice and receipt workflows, and accounting exports in a cloud product. The unlimited incoming-invoice inbox and broad exports strengthen even the free tier, but low document caps make Premium the sensible choice once volume rises. Look elsewhere if you need more than five users or a workflow beyond the invoicing and accounting features it provides.