Hermetic Systems publishes Windows software in diverse fields. All these programs are hand-crafted for functionality and ease-of-use, and have been extensively tested.

This page has, for each of our programs, a link to Digital River for purchase of a perpetual (time-unlimited) user license. That link takes you to Digital River's payment-processing website, where you can pay via credit or debit card, or in other ways. If you prefer to pay via PayPal you can do that easily at Digital River's website.

For some programs there are time-limited (3-month and 1-year) user licenses. To purchase a time-limited user license, click on the program title to go to the product page and follow the 'Purchase' link.


Hermetic Word Frequency Counter

US$49.75, €44.95, £38.25

Purchase via Digital River

This software scans a file, or text on the clipboard, and counts the number of occurrences of the different words. The words which are found and displayed can be ordered alphabetically or by frequency. Supports non-English text.


Hermetic Word Frequency Counter Advanced Version

US$77.45, €69.95, £59.25

Purchase via Digital River

Scans one or more MS Word docx, text or text-like files (e.g. HTML and XML files) and counts the number of occurrences of different words or phrases (optionally with pattern matching). The words/phrases can be displayed alphabetically or by frequency. Works with text in most European languages.


Email Encryption End-to-End

US$49.95, €44.45, £34.75

Purchase via Digital River

A program to encrypt a message to send by email, and to decrypt encrypted messages received. Using this ensures that email is encrypted before it is transmitted to your mail server and remains encrypted until after downloading by the recipient. Bilingual: English and German.


Backup Modified Files

US$36.75, €33.45 or £23.95

Purchase via Digital River

Software to back up files in all (or selected) folders and their subfolders; all files, or just new and modified. Backup operations can be saved in setup files. Program is network-compatible. Can be run via Task Scheduler with optional auto shutdown.


Chinese Calendrics

US$39.95, €35.45, £27.75

Purchase via Digital River

A program to convert between dates in various Chinese calendars and dates in the Gregorian and Julian calendars, and to find (among other things) lunar new year's day and leap months for any year in the Chinese Calendar.


Data Destroyer

US$39.75, €35.45, £26.45

Purchase via Digital River

A program for secure file deletion which overwrites data in specified files so that the data cannot be recovered by any means. A single file can be purged or, in batch mode, multiple files. Selected subfolders of a folder can be purged. The user can specify the type of purge. Purge speed can be tested for an estimation of time required. Can wipe files older than a specified date. Can wipe files in the Windows 7 and 8 Recycle Bin.


Easy Date Converter

US$19.95, €18.95 or £14.95

Purchase via Digital River

Adds a number of days or months to a date, calculates the number of days between two dates (with or without weekend days), and converts among Common Era (Gregorian) dates, Julian dates, ISO 8601 Week dates, Hermetic Leap Week dates, Julian day numbers and day-in-year dates of the form yyyy-ddd. Bilingual: English and German


Julian-Gregorian-Dee Date Calculator

US$14.95, €13.45 or £9.95

Purchase via Digital River

Converts between Julian, Gregorian, Dee and Dee-Cecil calendar dates in various formats, adds/subtracts a number of days, weeks, months and years to/from a given date, and calculates vernal equinoxes using either mean or apparent solar time.


Hermetic MultiFile Search

US$36.75, €33.45 or £23.95

Purchase via Digital River

This software is for indexing docx file, text files, HTML files, XML files or files of a similar type in multiple folders and their subfolders to allow subsequent quick searching of those files.


Equinoxes, Solstices and Cross-Quarter Days

US$14.95, €13.45 or £9.95

Purchase via Digital River

Software to calculate accurate dates and times for equinoxes, solstices and the Celtic cross-quarter days. The cross-quarter days are those midway between the equinoxes and solstices.


Stego PNG

US$29.45, €26.75 or £19.75

Purchase via Digital River

An easy-to-use steganography program which allows you to encrypt and hide a file in a PNG or BMP image file, with the use of a stego key, so that the presence of the hidden file is undetectable, even by software using statistical methods.


MD5 File and Folder Comparator

US$19.95, €17.45 or £13.75

Purchase via Digital River

MD5 File and Folder Comparator is for comparing files as to whether or not they are identical in content. A pair of files may be compared, or all files in two subfolders (optionally including files in their subfolders). Comparison of files in folders may be done to display files which are the same and which are different.


Cryptosystem ME6

US$49.95, €44.45, £34.75

Purchase via Digital River

A program for the encryption and decryption of single or multiple files for secure storage or transmission. It uses a symmetric key encryption method with a 500-bit key for security, and has numerous safeguards against user error.


Lunar Calendars and Eclipse Finder

US$19.95, €17.75 or £13.75

Purchase via Digital River

A program to search for eclipses (lunar, solar, total, annular and partial), to calculate the phase of the Moon at any given date and time and to convert between dates in the Gregorian and Julian calendars and dates in various lunar calendars: Meyer-Palmen Solilunar, Hermetic Lunar Week, etc.


These programs run under all versions of Windows from Windows XP to Windows 10. All are completely malware-free (as confirmed by the VirusTotal link on each product page). The free trial versions can be made fully-functional by means of an activation key after purchase of a user license. The key is sent by email immediately upon your purchase (or can be obtained immediately after purchase), so there's no waiting required. (If you do not receive the message, please check your spam folder. To ensure that you can receive that message you could whitelist support@hermetic.ch in your email client.) Updates to new versions are free, as is tech support for the duration of the user license.


This website also has many articles about solar and lunar calendars, cryptography,
computational science and other topics
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