Terms of Service
Stand: May 2026
The German version of these terms is the legally binding one.
Always verify payment details before transferring money. Billstac does not guarantee the correctness of any invoice data and accepts no liability for incorrect payments.
1. Scope
These terms govern the use of the Billstac platform at billstac.com.
By registering or using Billstac you accept these terms.
2. The service
Billstac is a software for organising and managing invoices.
Billstac in particular enables:
- uploading invoices and documents,
- automatic recognition of invoice information,
- managing invoices,
- reminders for due invoices,
- connecting supported email accounts,
- overviews and analytics.
The concrete feature set may vary by plan and may evolve over time.
3. Usage notes
Billstac serves the organisation and management of invoices, deadlines and payment information. The information provided is processed automatically and may be incomplete, incorrect or out of date.
Billstac gives no warranty as to the correctness, completeness or timeliness of the information provided.
Users are required to independently verify invoices, deadlines, payment amounts and any other relevant information.
Billstac does not replace tax, legal or accounting advice.
Reminders are sent without guarantee. Users remain responsible for meeting their payment obligations on time, irrespective of any reminders or notifications.
4. Not a payment or banking service
Billstac is not a credit institution, not a payment service provider and not a bank.
Billstac does not process payments on behalf of users.
Billstac serves exclusively the organisation and management of invoices and payment obligations.
The user remains solely responsible for paying invoices on time.
Reminder features do not release the user from their own duty to verify and act.
5. Registration
Some features require the creation of a user account.
The user undertakes to:
- provide accurate information,
- keep their credentials confidential,
- not grant unauthorised third parties access to the account.
The user is responsible for all activity carried out via their account.
6. Gmail and Outlook integration
Billstac can, at the user's request, be connected to a Gmail or Outlook account.
The connection is established only after the user's explicit consent.
The user can disconnect at any time.
Billstac processes the connected emails solely for the purpose of automatic invoice detection and invoice management.
7. Uploaded content
The user remains the owner of all uploaded documents and content.
The user confirms they are entitled to use the uploaded content and to make it available to Billstac for processing.
It is prohibited to upload content that:
- violates applicable law,
- infringes third-party rights,
- contains malware,
- is used abusively or fraudulently.
8. AI-based processing
Billstac uses automated procedures to detect and extract invoice data.
The results may be incomplete, inaccurate or misleading.
The user remains obliged to verify all invoice information independently before making a payment.
9. Availability
Billstac aims for the highest possible platform availability.
Uninterrupted availability cannot, however, be guaranteed.
Maintenance, technical failures or external factors may lead to temporary restrictions.
10. Paid services
Some features may be subject to a fee.
Current prices are shown on the website or inside the application.
Subscriptions renew automatically unless cancelled before the end of the respective term.
Payment processing is handled by Stripe.
11. Termination and account deletion
The user can delete their account at any time.
Upon deletion, the associated data is removed in accordance with the privacy policy, unless statutory retention obligations apply.
Payment claims already accrued remain unaffected.
12. Liability
Billstac is liable without limitation for intent and gross negligence.
For ordinary negligence Billstac is only liable for the breach of essential contractual duties, and limited to the foreseeable, contract-typical damage.
Liability for lost profits, missed savings, data loss or indirect damages is excluded to the extent permitted by law.
13. Changes to the service
Billstac is entitled to further develop, adapt or discontinue features, content and services, provided this does not unreasonably impair the legitimate interests of users.
14. Changes to these terms
Billstac reserves the right to amend these terms in the future.
Users will be informed of material changes in an appropriate manner.
15. Governing law
German law applies, excluding the UN Convention on Contracts for the International Sale of Goods.
Mandatory consumer protection provisions of the state in which the user has their habitual residence remain unaffected.
16. Final provisions
Should individual provisions of these terms be or become invalid in whole or in part, the validity of the remaining provisions remains unaffected.