🇩🇪 Rechly-DE-0.5B (Nano): Ultra-Lightweight German Accounting AI for Edge & 500 MB RAM

The pocket-sized 0.5-Billion parameter Nano Language Model for German Invoicing, the 2025/2026 E-Rechnung Mandate (EN 16931, XRechnung 3.0), and DATEV SKR03/04 Bookkeeping.

Runs 100% on-device inside ~500 MB RAM on Raspberry Pi 4/5, budget 512MB RAM instances, or edge IoT appliances with near-instantaneous 0.3s response times.

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🏛️ The Rechly Model Family

• ⚡ Rechly-DE-3B (Flagship) — 3B params · 1.84 GB · Desktop & Production Server
• 🪶 Rechly-DE-1.5B (Slim) — 1.5B params · 940 MB · 1 GB VPS & Cloud Run
• 🔬 Rechly-DE-0.5B (Nano) — 0.5B params · 379 MB · Raspberry Pi & 512MB RAM

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⚡ 10-Second Quickstart

1. Run with Ollama:

# Clone and build local Ollama model
huggingface-cli download jonprompter/rechly-de-0.5b rechly-de-0.5b-q4_k_m.gguf Modelfile --local-dir .
ollama create rechly-de-0.5b -f Modelfile
ollama run rechly-de-0.5b

2. Test an invoice in one line:

ollama run rechly-de-0.5b "Rechnung an Blumenladen Rose: 5 Stunden Schaufensterdeko à 55€, Kleinunternehmer ohne USt."

3. Python 4-Liner:

import requests

resp = requests.post("http://localhost:11434/api/chat", json={
    "model": "rechly-de-0.5b",
    "messages": [{"role": "user", "content": "Kategorisiere für SKR03: 'Google Workspace Cloud monatlich 72€'"}],
    "stream": False,
    "options": {"temperature": 0.0}
})
print(resp.json()["message"]["content"])

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⚡ Specifications

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🎯 Supported Accounting Domains

1. Edge Text-to-Invoice Extraction: Fast extraction of client name, prices, quantities, and due dates.
2. DATEV Account Matching: Quick lookups for SKR03 and SKR04 chart accounts.
3. GoBD Pre-Auditing: Edge validation of incoming supplier receipts.
4. B2B Position Text Formalizer: Rewrites colloquial notes into standard invoice descriptions.

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⚖️ Legal, GDPR & Benchmark Disclaimers

1. No Tax Advice (Keine Steuerberatung)

Rechly-DE-0.5B provides automated text extraction and schema formatting based on public statutory standards. It is an open-source productivity tool and does not replace certified tax advice by an authorized Steuerberater (gem. StBerG / RDG).

2. GDPR / DSGVO Notice

*The model runs locally on-device with zero network egress, supporting Data Protection by Design & Default (Art. 25 GDPR). However, legal GDPR compliance remains the responsibility of the entity acting as the Data Controller (Art. 4(7) GDPR).*

3. Internal Synthetic Benchmark Notice

Reported performance figures represent internal, synthetic test cases developed within this project. They do not constitute an official government audit or certified third-party endorsement.

4. Trademarks & Third-Party Notice

DATEV® is a registered trademark of DATEV eG. ZUGFeRD is a registered specification of FeRD / AWV e.V. This project is an independent community project and is not affiliated with or endorsed by DATEV eG or FeRD.

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🔒 License & Open Source

Licensed under the Apache 2.0 License. Built by the Rechly team for privacy-first, on-premise German accounting.