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SkeyCalc is an RFC-2289 Compliant OTP (S/Key) calculator that computes One-Time Passwords for use in logging in (or otherwise authenticating to) servers which implement S/Key or OTP access control.

SkeyCalc operates as a service, allowing for lightning-fast OTP authentication. SkeyCalc supports the keychain, and uses sensitive regular expressions to make even the selection of an OTP challenge a snap.

What's New

Version 3.0:
  • Universal binary runs natively on Intel and PowerPC processors
  • Apple Keychain support
  • Cleaned up user interface to remove old NeXT-looking widgets and fonts
  • Swanky new app icon looks better at sizes larger than 48x48
  • New (optional) panel shows results after calculating, rather than just copying and quitting
  • Service appears by default on Mac OS X 10.6 and up
  • Requires Mac OS X 10.3 and higher


MacOS X 10.3.9 or later

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Current Version (3.x)


Downloads 2,569
Version Downloads 779
License Free
Date 22 Sep 2009
Platform OS X / PPC 32 / Intel 32
Price Free
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