E‑Rechnungs-StudioCasserus UG (haftungsbeschränkt)
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Related Products
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About
Coretool is a browser-based invoicing application for German businesses, freelancers, sole traders, tradespeople, and small service businesses. Users can create and manage quotes and invoices, including XRechnung and ZUGFeRD e-invoices, track customers, send payment reminders, and organize appointments. The app supports GiroCode QR codes, digital quote signatures, and validation of e-invoice documents through its REST API. API-based workflows can connect with automation tools such as Make, Zapier, and n8n; availability of some platform-specific modules may depend on approval. Calendar feeds can be added to Google, Apple, or Outlook calendars. The optional Kalkulations-Assistent supports project estimates, material and labor calculations, and quote creation. Coretool runs in a web browser without local installation. Its free plan allows three invoices per month; Solo costs €9/month plus VAT and can be canceled monthly.
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About
E-Rechnungs-Studio is a German web app for creating, converting, validating and viewing electronic invoices.
Users can upload an existing invoice PDF and convert it into an EN 16931-compatible e-invoice, including XRechnung and ZUGFeRD. The tool also includes an online validator for XRechnung XML files and ZUGFeRD PDFs, plus a viewer that makes structured invoice data readable.
It is designed for small businesses, freelancers, agencies, service providers and companies in Germany that need to handle individual e-invoices without installing full accounting software.
Core functions include PDF to XRechnung conversion, PDF to ZUGFeRD conversion, XRechnung validation, ZUGFeRD validation and readable e-invoice viewing.
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Audience
Businesses, freelancers and sole traders in Germany that need to issue e-invoices (XRechnung, ZUGFeRD)
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Audience
E-Rechnungs-Studio helps German businesses create, validate and view electronic invoices. Users can convert existing PDF invoices into XRechnung or ZUGFeRD, validate XRechnung XML and ZUGFeRD PDFs, and display structured invoice data in a readable format.
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Not Supported
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API
Offers API
Supported
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API
Offers API
Not Supported
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Screenshots and VideosNo images available
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Screenshots and Videos |
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Pricing
€0/month
The free plan includes up to 3 invoices per month. Solo costs €9/month plus applicable VAT and can be canceled monthly.
Free Version
Supported
Free Trial
Not Supported
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Pricing
€10 / Month
Freemium.
Options: Free, Basic, Pro, Custom integrations.
Free Version
Supported
Free Trial
Supported
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Reviews/
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Reviews/
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Not Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Company InformationCoretool
Germany
coretool.de/en
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Company InformationCasserus UG (haftungsbeschränkt)
Founded: 2021
Germany
e-rechnungs-studio.de/de
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Integrations
Apple Calendar
Supported
Google Calendar
Supported
Make
Supported
Microsoft Outlook
Supported
Zapier
Supported
n8n
Supported
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Integrations
Apple Calendar
Not Supported
Google Calendar
Not Supported
Make
Not Supported
Microsoft Outlook
Not Supported
Zapier
Not Supported
n8n
Not Supported
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