AI software that lowers purchasing costs in hospitality
RechnungsWächter GmbH is a software start-up from Münster, Germany. We develop our own AI platform. It reads every supplier document, checks it and turns it into cost control in real time.
- Company
- RechnungsWächter GmbH, Münster, Germany
- Incorporated
- December 2025
- Product live since
- 15 March 2026, launch at Internorga in Hamburg
- Platform
- iOS, Android and web app, partner API
- Development
- Built entirely in-house
- Business model
- Software as a service, billed per location
Hospitality businesses lose money between delivery and payment
A restaurant receives a steady stream of supplier invoices, delivery notes and credit notes. Most of them are checked by hand, if at all.
Prices rise quietly. Quantities on the invoice differ from what was delivered. Returned deposits are never credited. Owners usually see the damage weeks later in the report from their tax advisor, when it can no longer be corrected.
On top of that, the paperwork takes hours that belong in the kitchen and with the guests.
Upload the documents, get real-time cost control
The team photographs or forwards a document. RechnungsWächter does the rest, with no manual data entry and no connection to a POS or inventory system required.
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Capture
Documents arrive by photo, email forwarding, upload, a dedicated inbox per location or a connected mailbox. E-invoices in ZUGFeRD and XRechnung format are read as well.
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Read
Our AI recognises 14 document types, among them invoices, delivery notes, order confirmations, quotes, price lists and credit notes. It reads each one down to the single line item, including handwritten corrections.
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Match
RechnungsWächter matches the documents autonomously. It checks every invoice line against delivery note, order and agreed price for quantity, price and unit, and detects duplicates and missing mandatory details.
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Act
A deviation becomes a complaint to the supplier, sent automatically or after approval. RechnungsWächter follows it up until the credit note arrives.
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Control
From the same documents the platform builds cost control in real time. It shows cost of goods ratio, costs by type, price development per item, deposit balances, fixed costs and upcoming payables.
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Hand over
Checked documents go to the tax advisor or to DATEV Unternehmen online, Agenda, Lexware Office or BMD, together with an account assignment suggestion.
How RechnungsWächter actively lowers costs
- It stops overpayments before an invoice is paid.
- It shows silent price increases per item in percent and in euros and flags them for renegotiation.
- It recovers money from complaints and from returned deposits that were never credited.
- On mandate, our purchasing advisory finds suppliers with better prices for goods, energy and card fees. In purchasing, the average is 4.8 percent, based on our own customer data.
Businesses with many suppliers and thin margins
- Owner-operated restaurants, cafés, bars and hotels
- Retail shops, kiosks and wholesalers with many suppliers
- Trades businesses that buy material at daily prices
- Chains and franchise systems with several locations
Our home market is Germany. RechnungsWächter pays off from about 30 supplier invoices per month.
Business model
RechnungsWächter starts at €78.40 per location per month on the annual plan.
MargenWächter adds inventory, waste tracking and sales data from POS systems and delivery platforms for €49 more per location per month. Purchasing advisory is included.
FilialWächter adds a cockpit across all locations for €99 per month, flat.
Every plan starts with a 14-day free trial.
See RechnungsWächter in action
Screens from the live app on iPhone and iPad.
Integrations
- POS systems
- Allo, Vectron, Lightspeed, Orderbase, gastronovi, Hypersoft
- Delivery platforms
- Lieferando, Wolt, Uber Eats
- Accounting
- DATEV Unternehmen online, Lexware Office, Agenda, BMD
- HR tools
- JobDone, Ordio
- Bank accounts and partner API
- Payments from the app, own API keys, documented partner API
Get the app: App Store Google Play Book a live demo
Where RechnungsWächter stands today
Built in-house
Our team designs and develops the entire app itself: iOS, Android and web app, the document processing and the partner API.
Live since 15 March 2026
We launched RechnungsWächter at Internorga in Hamburg, the major trade fair for food service and hospitality. Since then businesses use it in daily operation.
Speaker for DEHOGA
At Internorga 2026 Armin Roosen spoke in the DEHOGA Club, the forum of the German Hotel and Restaurant Association, about cost traps in hospitality.
In the app stores
Available in the App Store and on Google Play, with guided onboarding and in-app support.
Hosted in Germany
Servers in Germany, GDPR compliant, data processing agreement included. Roles and rights control who may approve, book or only capture.
Find us on TrustpilotCapterraOMR ReviewsLinkedIn company pageTECH.LAND Accelerator
What we are building next
Automated pre-accounting
Today RechnungsWächter suggests the account assignment. Next, it prepares the bookkeeping entries automatically, ready for the tax advisor.
An agent that works for the owner
An AI agent that negotiates prices with suppliers on behalf of the business and completes the bookkeeping on its own.
Recognition, analysis and scale
We use AI systems for document recognition and AI analysis, and we are building the platform to serve many more businesses and locations.
The people behind RechnungsWächter
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Armin Roosen
Founder and Managing Director, product and technologyBusiness informatics graduate. 10 years in system catering and franchising with Gustav Grün, ÁRO and Cuchara, helping build more than 20 locations. Most recently Chief Business Officer, responsible for IT, controlling, purchasing, B2B sales and logistics.
Armin Roosen on LinkedIn -
Robin Ervenich
Partnerships and salesBackground in risk controlling in banking. Built sales systems for companies for many years.
Robin Ervenich on LinkedIn -
Nils Hellenkamp
IT security and technologySerial founder with a background in technology. Responsible for the security and technical operation of the platform.
Nils Hellenkamp on LinkedIn -
Jonas Lorat
Marketing (working student)Working student in marketing and content.
Jonas Lorat on LinkedIn
How to reach us
- Company
- RechnungsWächter GmbH
Mendelstraße 11
48149 Münster, Germany - Commercial register
- Amtsgericht Münster (local court), HRB 23184
- Managing director
- Armin Roosen
In German: Über uns, Impressum, Sicherheit, Integrationen.