Run multiple calculator instances simultaneously.
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Old versions

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Perform basic and advanced calculation in the RPN-based calculation program. Execute multiple active calculators, each with separate programs and data contents for multi-process data management. Inspect all components of an equation and check for errors.

LXVII (pronounced "67") is a faithful simulation of the Hewlett-Packard HP-67 calculator for Mac OS X. Among its many features are:
- The ability to have multiple calculators and programs running at once.
- A live display of all stack, memory and program registers.
- A separate paper tape window
- Customizable display colors
- and many more

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