Built for the Work
Plan target queues, calculate eyepiece geometry, log seeing and transparency, preserve sketches and photos, and export red-light observing notes.
One-time iPhone and iPad app
Asterfolio: Night Notebook
Preserve what the eyepiece actually showed, under the sky conditions and optical setup that made it visible.
Actual App Interface
Ready When the Work Starts
Plan target queues, calculate eyepiece geometry, log seeing and transparency, preserve sketches and photos, and export red-light observing notes.
Core Tools
- 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
Private by Design
Asterfolio has no account, ads, tracking, analytics, subscription, or developer-operated backend. Records stay on your device unless you intentionally export a PDF through the iOS share sheet.
Product Boundary
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.