Does The Spy's Knife work offline?
Yes. The Spy's Knife is a single HTML file that runs entirely in your browser. No internet connection required after download. Your data never leaves your device.
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The Spy's Knife
Ciphers, codes, and covert tools — all offline
Puzzles & CryptographyKnife 15 of 50
$39
One-time purchase · Instant download30-day money-back guarantee
$39
What it does
The Spy's Knife is a cryptographic playground in a single HTML file. Encrypt and decrypt with over ten classical ciphers, hide messages in images with steganography, generate number station broadcasts, create QR codes and barcodes, and simulate invisible ink with UV-effect CSS — all running locally with zero network calls.
INCLUDED TOOLS — 11 TOTAL
\Caesar Cipher
\Vigenère Cipher
\Atbash Cipher
\ROT13
\Rail Fence Cipher
\Morse Code
\Steganography
\Number Station Generator
\QR Code Encoder
\Barcode Generator
\Invisible Ink Simulator
DELIVERYSingle HTML fileDownload instantly after purchase
PRIVACY100% localYour data never leaves your machine
OWNERSHIPOne-time purchaseNo subscription, no recurring fees
PRO TIP
The file works in any modern browser — Chrome, Firefox, Safari, Edge. Save it to a USB drive, email it to yourself, or keep it in your cloud storage. It will work anywhere, anytime, forever.
Sovereignty as a Service
$39. Yours. Forever.
FREQUENTLY ASKED QUESTIONS
OTHER PRODUCTSIs The Spy's Knife a subscription?
No. The Spy's Knife is a one-time purchase of $39. No monthly fees, no renewals, no price increases.
What is included in The Spy's Knife?
The Spy's Knife bundles 11 puzzles & cryptography tools into a single HTML file: Caesar Cipher, Vigenère Cipher, Atbash Cipher, ROT13, Rail Fence Cipher, Morse Code, and 5 more.
Where is my data stored?
Entirely in your browser's local storage. Nothing is uploaded, transmitted, or tracked. You can export your data as JSON at any time and import it on another device.
Which browsers and operating systems does The Spy's Knife support?
Any modern browser — Chrome, Firefox, Safari, Edge — on Windows, macOS, Linux, ChromeOS, iOS, or Android. The same file works everywhere.
Sovereignty as a Service