Sumlino

Sumlino

WebInferio
Coretool Sumlino

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Coretool:

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.
Sumlino:

About

Sumlino is web-based invoicing and customer management software for freelancers, small businesses, studios, schools and clubs. Users can create branded invoices, quotes and credit notes, manage customer groups, track hours and business trips, and turn recorded work into draft invoices. Quotes can be accepted online using an email code. Other features include receipt uploads, recurring invoices, stock tracking, bank statement imports, bookkeeper access and data exports. Mollie supports payment links and direct debit, with approval required for each collection period. The website is available in Dutch and English. New users receive five free documents, then pay per document or choose an Unlimited subscription. Optional AI extraction helps process purchase invoices, with user review before import. Dutch calculators and practical guides are available without an account. Direct tax filing and automatic bank feeds are not included.
Coretool:

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
Sumlino:

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
Coretool:

Audience

Businesses, freelancers and sole traders in Germany that need to issue e-invoices (XRechnung, ZUGFeRD)
Sumlino:

Audience

Freelancers, small businesses, studios, service providers, schools and membership organisations, especially in the Netherlands.
Coretool:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported
Sumlino:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported
Coretool:

API

Offers API Supported
Sumlino:

API

Offers API Not Supported
Coretool:

Screenshots and Videos

No images available
Sumlino:

Screenshots and Videos

No images available
Coretool:

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
Sumlino:

Pricing

EUR 0.75/quote excl. VAT
Free Version Not Supported
Free Trial Supported
Coretool:

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Review this Software
Sumlino:

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software
Coretool:

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
Sumlino:

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
Coretool:

Company Information

Coretool
Germany
coretool.de/en
Sumlino:

Company Information

WebInferio
Netherlands
sumlino.com
Coretool:

Alternatives

E‑Rechnungs-Studio

E‑Rechnungs-Studio

Casserus UG (haftungsbeschränkt)
Sumlino:

Alternatives

InvoiceLead

InvoiceLead

Quantum Liquid
Coretool:
Sumlino:
Coretool:
Sumlino:
Coretool:
Sumlino:
Saldy

Saldy

Dienstleistungen24
Coretool:
xSuite

xSuite

xSuite Group
Sumlino:
Coretool:

Categories

E-Invoicing Supported
Sumlino:

Categories

Coretool:

Integrations

Apple Calendar Supported
Google Calendar Supported
Make Supported
Microsoft Outlook Supported
Zapier Supported
n8n Supported
Sumlino:

Integrations

Apple Calendar Not Supported
Google Calendar Not Supported
Make Not Supported
Microsoft Outlook Not Supported
Zapier Not Supported
n8n Not Supported
Coretool:
Claim Coretool and update features and information
Claim Coretool and update features and information
Sumlino:
Claim Sumlino and update features and information
Claim Sumlino and update features and information