The features that matter most are the ones tied to daily work: individual animal records keyed to a permanent ID, health and treatment logs that calculate withdrawal dates, breeding and reproduction tracking, and weight and performance history you can act on.
Tracking breeding, gestation, and calving records means keeping one continuous, dated file for each female, built on a permanent individual ID, that records who she was bred to and when, whether a pregnancy check confirmed she settled, and what happened when she calved.
Yes, most livestock software is built to work offline, because ranches and paddocks often sit beyond cell coverage, and the standard design saves each record on the phone or tablet and syncs it to the cloud once a signal returns.
For a small, single-species operation that mostly needs head counts, birth and death records, and a year-end tally of income and expenses, a spreadsheet or even a paper record book is genuinely enough, and university extension programs treat simple records kept consistently as the real goal rather than any particular tool.
Most livestock management software costs between $0 and about $80 per month for a small or mid-size herd, with paid plans commonly starting near $12 to $35 per month once you move past the free tools.