Dein persönliches Backoffice für Dokumente, Finanzen und Termine.
G-Stack watches an inbox folder, reads every PDF with Gemini, and files it — named like a human, sorted like an accountant. Invoices tracked. Health claims totalled. Appointments on your calendar. Your archive stays on your disk.
G-Stack runs as a background service. Drop a PDF, forward an email, link a bank account — come back to renamed files, matched transactions, and tracked contracts.
A watcher folder, Google Drive inbox, or Gmail — use whatever already collects your receipts.
OCR + classification in one pass. Vendor, date, amount, category — structured JSON, cents per batch.
A wizard shows proposed renames and folder moves. One click to accept. Undo any time.
Archive is plain folders on your disk. Structured database for search, reports, totals.
Start with the OCR watcher. Grow into banking, invoices, contracts, health, mail, calendar, and a mobile app. Everything shares one folder tree and one database.
Snap a receipt at the pharmacy. Forward a contract on the train. Then ask, in plain German: “Wann läuft mein Vodafone-Vertrag aus?” — and get the answer, with the source document cited.
Every answer comes with the exact PDFs Gemini read — no hallucinations, just 1,284 documents you already own. Tap a citation to open the source.
Gemini 2.5 Flash is priced per token — not per document. Drag the slider to see what G-Stack costs versus paper filing for the same volume.
Source: ai.google.dev pricing · labor @€35/h · figures exclude lost-document risk.
G-Stack uses Gemini for OCR and sort analysis. Rather than bundling it and marking it up, you paste your own API key once — we run it against your quota, no middleman.
Generate a free key at aistudio.google.com, paste it into Settings, and you're running. Every API call is logged with input/output tokens and cost so you see exactly what the AI did for you.
GEMINI_API_KEY in your DB, never leaves your instance.G-Stack runs in one place — your account, your data, nobody else's. No analytics, no tracking pixels, no marketplace. The only thing that ever leaves the server is the page Gemini needs to read, sent with your own Google key.
Your archive and your database live on a server in Germany, under EU privacy law. There is no shared database with other customers — your data sits in its own dedicated space.
EU · single tenant · your data, your boxEvery page, every file download, every API call is served over HTTPS with auto-renewed certificates. Nobody on your café Wi-Fi — or anywhere between you and the server — can read what you send.
HTTPS · auto-renewed · modern TLSYou sign in with your Google account — no passwords for us to lose. Only email addresses you put on the allow-list can reach the app; everyone else bounces at the door.
Google OAuth · invite-only · revokableGmail, Drive, and Calendar are off until you switch them on, one at a time. Each connection is a separate Google consent screen you can revoke from your Google account whenever you want.
Per-feature · reversible · least accessYour Google connections, your Gemini key, your banking and portfolio tokens are all encrypted in the database with a master key only your server holds — and that key can be rotated without downtime.
At rest · rotatable master key · auditedDocuments are stored as plain PDFs in normal folders on your disk — Category, Person, Vendor. If you ever stop using G-Stack, your files are exactly where you left them. Nothing locked, nothing proprietary.
Plain files · no lock-in · portableWe only read the email you sign in with — nothing else from your account until you grant Drive or Gmail scopes later, from inside the app.
You'll land on a blank archive. Drop a PDF into the inbox folder (or paste your Gemini key first) — and you're running.
You only pay Google for Gemini usage (~$0.14 per 1,000 pages). No subscription, no seats, no lock-in.
Your personal backoffice for documents, finances, and appointments.
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