Log the night sky.
Earn the certificate.
Starshelf is a stargazing log that never leaves your device. Track sky conditions, seeing, transparency, and the objects you observed, and watch three built-in catalogs — Messier, Planets & Moon, and Double Stars — check themselves off as you log.
Everything a stargazing log should do
Session Logging
Log seeing, transparency, Bortle class, temperature, and notes for every session. Moon phase and illumination are computed automatically — no astronomy API, no signal required.
Built-in Catalogs & Life Lists
The full Messier catalog (110 objects), Planets & Moon, and 28 classic double stars, each with its own life list that checks off automatically and shows live progress.
Gear Shelf
Track telescopes, eyepieces, binoculars, Barlows, and filters. Magnification, exit pupil, and true field of view are calculated live from whatever pairing you pick.
Achievement Certificates
Cross 25%, 50%, 75%, or 100% of a catalog and unlock a printable certificate instantly, on-device. Generate a one-off Session Certificate for any night worth remembering.
Reports & Insights
Export a formatted Session Report PDF, browse observatory-style stats on your own logged data, and reach plain-language Bortle, seeing, and transparency reference guides.
Private by Design
No account, no backend, no analytics. Everything you log stays on your device — nothing is uploaded unless you personally choose to export or share a file.
Free to start
Get observing
- Up to 5 observing sessions
- Full Messier catalog and life list
- Messier Achievement Certificates, viewable on-screen
- Complete Gear Shelf
One-time purchase
- Unlimited observing sessions
- Planets & Moon and Double Stars catalogs and certificates
- PDF export, print, and share for every session report and certificate
- No subscription, ever — pay once
Starshelf's Achievement Certificates are an original in-app feature, generated on your device with no submission or verification step — they are not affiliated with, awarded by, or submitted to any real-world observing club or organization.