To that end, TimePassages is my favorite app (available on both iOS and Android) for rendering birth charts, along with the website astro.com.
Back in the day, the only way to calculate a birth chart was by hand, using a protractor and a table known as an ephemeris. Thankfully, we have astrology software now, making it possible to calculate a complete birth chart in less than a second. To that end, TimePassages is my favorite app (available on both iOS and Android) for rendering birth charts, along with the website astro.com.