Cast a tropical natal (birth) chart: the ten planets with sign, degree, house and retrograde flag; Ascendant and Midheaven; twelve house cusps (Placidus by default); major aspects with orbs and applying/separating; and the dominant element and modality. Works without a birth time (no angles or houses then).

Planet positions for a date and time (default: now), and, given a natal chart, the major aspects the transiting planets make to the natal planets, Ascendant and Midheaven within an orb (default 2°), with the natal house each transiting planet is passing through.

Compare two natal charts: the major aspects between person A's planets (and Ascendant) and person B's, with orbs (conjunction/opposition 6°, square/trine 5°, sextile 3°), where each person's planets fall in the other's houses, and a simple descriptive tally (not a compatibility score).

Mercury retrograde periods overlapping a date range (default: the next 12 months): pre-shadow start, station retrograde, station direct and post-shadow end (to about a minute, in UTC and a chosen time zone), with the degrees and signs of the two stations.

Hellenistic annual profection for an age or a date: the profected house (whole-sign, counted from the Ascendant; from the Sun's sign if the birth time is unknown), its sign, the lord of the year (traditional ruler, with the modern co-ruler) and where that lord sits in the natal chart, plus the dates the profection year runs.

The Moon's phase at a moment (default: now): phase name, illuminated fraction, Sun–Moon angle, days since new moon, the Moon's and Sun's signs, and the next new, first-quarter, full and last-quarter moons.