The One Hand logo — a hand-shaped mark in blue

Let Digital Help Everyone Be a Solo Company

Invoicing, job tracking, and a growing family of offline tools — digital independence for one-person businesses. Your data stays on your device.

What We Stand For

Digital Independence for One-Person Businesses

You shouldn't need a team of 50 or a cloud subscription to run a digital business. One person, one hand, tools that keep your data on your device — that's all it takes.

Privacy by Default

Your data stays on your device. No cloud sync, no tracking, no analytics SDKs. Every tool we build or champion stores data locally and encrypts backups with AES-256.

Open & Transparent

Open-source where possible. Clear pricing — InvoYX at €9.99/month, TaskSnap at €6.99/month, both after free trials. No dark patterns, no hidden fees, no auto-renewal traps.

Everyone Included

27 languages in InvoYX, 29 in TaskSnap — with independent UI and document language settings. RTL Arabic with Eastern Arabic numerals. Cyrillic, CJK, Latin. Accessibility built in — WCAG 2.1 AA.

Solo-First Design

No enterprise bloat. No team features you'll never use. No "invite your colleagues" prompts. Every feature is built for exactly one person: the solo founder running their business.

Our Products

Tools Built for One-Person Businesses

Purpose-built apps for solo founders, freelancers, and craftsmen. No cloud. No compromise. No enterprise bloat — every one of them private by design.

iOS + Android

Offline baby tracker — log feeding, sleep and nappies, with growth curves and reminders. No cloud, no data selling, GDPR-safe by architecture.

  • Feeding (breast/bottle/solid), sleep duration, nappy & milk-consumption log
  • Growth curves — weight, height & head circumference, offline WHO percentiles
  • Milestones & health log (medication, vaccination, temperature)
  • Pumping & breast-milk stash tracking (pumped vs consumed)
  • Feeding reminders (2/3/4/6h) + daily bedtime reminder
  • Paediatrician-ready A4 PDF + memory photo-PDF (8 designs)
  • 7-day, 30-day & weekly trend charts + full-text search

14-day free trial, then €4.99/month

View BabyTrack → Get BabyTrack on Google Play Download on the App Store
iOS + Android

Offline food-cost calculator for food trucks and pop-ups — build recipes with ingredients, and see cost per portion and food-cost % instantly.

  • Recipes & ingredients with quantities, prices & units
  • Cost per portion, food-cost % & yield/shrink calculation
  • Margin → suggested selling price (net/gross with VAT)
  • EU-14 allergen tracking & full nutrition (kcal, protein, carbs, fat)
  • Menu builder — 3 PDF designs with allergen & kcal legend
  • Sales tracking with calendar, photos & receipt PDFs
  • Menu engineering (stars / puzzles) + 13 currencies

14-day free trial, then €9.99/month

View TellerKalk → Get TellerKalk on Google Play Download on the App Store
iOS + Android

Offline mileage log — record trips with kilometres and purpose, split business & private, and get a GoBD-compliant PDF for the tax office.

  • Trip log — odometer km, purpose, date, business/private split
  • GPS auto-tracking — live distance, auto-stop after 2 min idle, Haversine
  • User-set kilometre allowance (€/km) applied automatically
  • Tax-compliant PDF logbook for 39 countries (DE GoBD · AT EStG · CH)
  • Multi-vehicle support — name, plate, photo, per-vehicle filter
  • Receipt photos embedded in the PDF + reverse-geocoded start/stop
  • Digitally-signed PDFs, single-trip route-map PDF, CSV & WhatsApp share

14-day free trial, then €4.99/month

View AutoLog → Get AutoLog on Google Play Download on the App Store
iOS + Android

Offline studio planner for music teachers, tutors and coaches — manage students, plan lessons, and send SEPA invoices, all on-device.

  • Students with contacts, notes & hourly rate + contact import
  • Lessons with date, duration & auto-computed fee + month calendar
  • Lesson packages with remaining-hours, refund & per-package goals
  • SEPA-QR invoices (EPC-compliant) with VAT for 39 countries
  • Progress & goals per student (1–5 rating chart)
  • Invoice status (open/paid) & auto-numbering, digitally-signed PDFs
  • Lesson reminders (30 min–1 day), CSV export & WhatsApp share

14-day free trial, then €7.99/month

View CoachMate → Get CoachMate on Google Play Download on the App Store
iOS + Android

Offline catalog for your collection — coins, stamps, sneakers, watches. Track value, condition and location, with a total-value dashboard and PDF export.

  • Items with value, condition, quantity, purchase & sell price, location
  • Size / grade field (shoe size, PSA grade) + category manager
  • Item history (buy / sell / move) & per-item value-history chart
  • Customers & sales with invoice PDF + contact import
  • Barcode / QR scan (EAN, UPC, Code128, QR, DataMatrix)
  • Multiple photos per item + PDF catalog, CSV & WhatsApp share
  • Dashboard, search & filters (collection / wishlist / sold)

14-day free trial, then €5.99/month

View SammelCheck → Get SammelCheck on Google Play Download on the App Store
Who We Are

Built by a Solo Founder, for Solo Founders

The One Hand was started in Vienna, Austria by Bilal Shadid — a developer and digital skills trainer who watched too many solo business owners upload their entire financial lives to cloud platforms they didn't control.

The name comes from a simple observation: a solo founder runs their entire business with one hand. They write invoices, track jobs, manage clients, log hours, and file taxes — all alone. The tools they use should respect that reality, not punish them with enterprise complexity or cloud surveillance.

Every product we build follows three rules: your data stays on your device, pricing is transparent and fair, and the tool works offline — no internet connection required after install.

We're based in Vienna. We ship globally. We don't track you.

The One Hand logo
Documentation

Manuals & Guides

Every feature of every app, explained step by step with screenshots — in English and German.

📘 TaskSnap · English

TaskSnap Guide

Profile & document language, PDF report settings, company data, encrypted backups, customers, jobs with timer, checklist, photos, materials, signature — and the dashboard.

📘 TaskSnap · Deutsch

TaskSnap Anleitung

Profil & Dokumentsprache, PDF-Bericht, Firmendaten, verschlüsseltes Backup, Kunden, Aufträge mit Timer, Checkliste, Fotos, Material, Unterschrift — und das Dashboard.

🧾 InvoYX · English

InvoYX Guide

Company data, bank details & payment QR code, tax numbers, invoices, quotes, credit notes & refunds, dunning, accounting exports and backups.

🧾 InvoYX · Deutsch

InvoYX Anleitung

Firmendaten, Bankdaten & Zahlungs-QR-Code, Steuernummern, Rechnungen, Angebote, Gutschriften & Rückzahlungen, Mahnwesen, Exporte und Backups.

🍼 BabyTrack · English

BabyTrack Guide

Feed, sleep & nappy tracking, feeding and bedtime reminders, growth curves with WHO percentiles, health log and memory PDF export.

🍼 BabyTrack · Deutsch

BabyTrack Anleitung

Füttern, Schlafen & Windeln erfassen, Fütter- & Schlafenszeit-Erinnerungen, Wachstumskurven mit WHO-Perzentilen, Gesundheits-Log und Foto-PDF-Export.

🎓 CoachMate · English

CoachMate Guide

Students & contact import, lesson planning with reminders, packages, progress tracking and SEPA-QR invoices.

🎓 CoachMate · Deutsch

CoachMate Anleitung

Schüler & Kontakt-Import, Lektionsplanung mit Erinnerungen, Pakete, Fortschritts-Tracking und SEPA-QR-Rechnungen.

💎 SammelCheck · English

SammelCheck Guide

Item catalog with value, condition and photos, value history, customers & sales and PDF export.

💎 SammelCheck · Deutsch

SammelCheck Anleitung

Objekt-Katalog mit Wert, Zustand und Fotos, Wertverlauf, Kunden & Verkäufe und PDF-Export.

🚗 AutoLog · English

AutoLog Guide

Trip logging, business/private split, GPS tracking, kilometre allowance and the GoBD-compliant mileage-log PDF.

🚗 AutoLog · Deutsch

AutoLog Anleitung

Fahrten erfassen, Geschäftlich/Privat-Trennung, GPS-Tracking, Kilometer-Pauschale und GoBD-konformes Fahrtenbuch-PDF.

🍽️ TellerKalk · English

TellerKalk Guide

Recipes and ingredients, yield and shrinkage, margin-based selling price, VAT and food-cost PDF.

🍽️ TellerKalk · Deutsch

TellerKalk Anleitung

Rezepte und Zutaten, Yield und Schwund, margenbasierter Verkaufspreis, USt und Food-Cost-PDF.

Latest Writing

Thoughts on Solo Digital Life

Practical guides for running a one-person business. No fluff — just real experience from solo founders, for solo founders.

Oct 4, 2026 · 4 min read

How to Write an Offer (Angebot) That Actually Wins the Job

An offer is a sales pitch, not a price list. The four-block structure that gets the job — and the legal fields every offer must include.

Oct 4, 2026 · 4 min read

Time Tracking for Tradespeople: Why Remembering Is Costing You Money

You bill from memory, and memory rounds down. What undocumented hours really cost you, and the 30-second fix.

Oct 4, 2026 · 4 min read

Food Cost Percentage: The One Number That Decides If Your Dish Makes Money

If you don't know your food cost %, you're pricing blind. The formula, a worked example, and where kitchens leak profit.

Oct 4, 2026 · 4 min read

Fahrtenbuch Rules in Germany and Austria: What the Tax Office Actually Requires

A Fahrtenbuch only counts if it's complete, accurate and in the right form. Here's what the tax office checks.

Oct 4, 2026 · 4 min read

How to Organize One-on-One Lessons Without Double-Booking

Music teacher, tutor, or coach — the problems are the same: scheduling, no-shows, and tracking who's paid.

Oct 4, 2026 · 4 min read

How to Catalog Your Collection Properly (Coins, Cards, Sneakers & More)

A collection without a catalog is just a pile of stuff. What to record — and why it matters for value, insurance and selling.

Oct 4, 2026 · 4 min read

Baby Feeding and Sleep Tracking: A Simple Guide for New Parents

Tracking feeding and sleep helps you and your pediatrician. What's actually worth logging, and what you can skip.

Aug 19, 2026 · 6 min read

How to Write an Invoice as a Tradesperson

The 8 things every legal invoice needs, the mistakes that delay payment, and a free template to start today.

Oct 31, 2026 · 5 min read

Track Jobs and Hours as a Solo Tradesperson

How to log time, photos and materials on every job — and prove it to the customer with a signed report.

Oct 31, 2026 · 5 min read

Mileage Log for Tax: What the Tax Office Actually Needs

The entries a valid Fahrtenbuch requires, the country-by-country rules, and why a digital log beats paper.

Aug 19, 2026 · 5 min read

ZUGFeRD & Factur-X Explained — One PDF, Two Formats

How a single hybrid PDF can replace manual data entry, satisfy your accountant, and save you hours every month.

Aug 19, 2026 · 5 min read

How to Get Paid Faster as a Contractor

Seven rules that end the 60-day wait — same-day invoicing, deposits, and payment terms that actually work.

July 30, 2026 · 6 min read

Why Offline Invoicing Matters — Privacy, Speed, and Digital Sovereignty

Most invoicing apps send your client data to the cloud. Your full client list, revenue history, and financial fingerprint — on servers you don't control. Here's why offline-first is the answer.

Coming Soon

The Solo Founder's Toolkit: 7 Privacy-Respecting Apps

A curated, opinionated list of tools that help you run a business without becoming the product.

Ready to Run Your Solo Business?

Invoice with InvoYX, track jobs with TaskSnap — both keep your data on your device, offline and private.