Inside the app
A closer look.
About this app
Made for a clear purpose.
Asterfolio is a red-light-first field notebook for visual astronomers and telescope owners.
Preserve what the eyepiece actually showed, under the sky conditions and optical setup that made it visible.
KEY FEATURES - Red-light session queue and observation timeline - Magnification, exit pupil, true field, and resolution math - Telescope, eyepiece, filter, and observing-site library - Sketch and image attachments with printable session reports - Optional local photos through Apple's Photos picker - Local PDF project brief - 175 original offline reference plates - No account, ads, analytics, tracking, subscription, or network requirement
Asterfolio is an observing notebook and optical calculator. It does not predict safe weather, navigation, solar-viewing safety, object visibility, or equipment suitability. Never view the Sun without purpose-built certified solar equipment and current expert guidance.
