Time Zone Desk
Compare multiple time zones side by side with a visual 24-hour overlap bar. Find meeting times that work across continents.
The best data collection happens where there's no signal
The Traveler's Knife is the answer
Agricultural fields, ocean passages, remote observatories, mountaintop sites. The places where you do your most important work are the places with the worst connectivity. Tools designed for zero connectivity. Collect data, make calculations, reference charts. All offline, all the time.
The Traveler's Knife is a single-file knife with 6 tools that runs entirely in your browser. The Traveler's Knife packages six travel essentials into a single HTML file. Compare time zones with a visual 24-hour overlap bar, convert Unix timestamps to human dates and back, convert units for distance, weight, and temperature, build reusable packing checklists with templates, reference currency exchange rates offline, and spell anything with the NATO phonetic alphabet — all offline, perfect for airports, airplane wifi, and remote locations.
WHAT'S INSIDE
6 tools in a single HTML file
Epoch/Unix Converter
Convert between Unix timestamps and human-readable dates in any timezone. Handles milliseconds, seconds, and ISO 8601 formats.
Unit Converter (Distance/Weight/Temp)
Quick conversions for the units travellers need most — miles↔km, pounds↔kg, Fahrenheit↔Celsius, gallons↔litres.
Packing Checklist Builder
Build reusable packing lists with templates for business, beach, hiking, and winter trips. Check items off as you pack.
HOW IT WORKS
Three steps. No setup.
1
Download the file
Purchase The Traveler's Knife and download a single HTML file. No installer, no account, no setup.
2
Open in any browser
Double-click to open in Chrome, Firefox, Safari, or Edge. Works on any operating system.
3
Start working
Your data stays in your browser's local storage. Nothing is uploaded. Ever.
COMPLIANCE & GEOGRAPHY
Global
Works in any country. No server dependency, no regional restrictions.
FAQ
Frequently Asked Questions
How does The Traveler's Knife solve the remote fieldwork tools problem?
The Traveler's Knife runs entirely in your browser. Agricultural fields, ocean passages, remote observatories, mountaintop sites. The places where you do your most important work are the places with the worst connectivity. Tools designed for zero connectivity. Collect data, make calculations, reference charts. All offline, all the time. Time zone desk, epoch converter, unit converter, packing checklist builder, currency converter, and NATO phonetic alphabet. Travel tools that work on the plane.
Is my data safe with The Traveler's Knife?
Yes. The Traveler's Knife is a single HTML file. It never connects to any server. Your data stays in your browser's local storage on your device.
What makes The Traveler's Knife different from cloud tools?
Cloud tools require internet, charge subscriptions, and store your data externally. The Traveler's Knife is a one-time purchase ($39), works offline, and never transmits data.
Is The Traveler's Knife really just one file?
Yes. The Traveler's Knife is a single HTML file containing 6 tools. Download it, open it in any browser, and start working. No installation, no dependencies, no accounts.
No cloud One fileOne-time purchase
Get The Traveler's Knife — $39Sovereignty as a Service