NightSky Book

Naked-eye astronomy reference.

Reference for naked-eye astronomy targets (constellations, planets, deep-sky) with viewing tips.

Free

Browse the full reference plus 3 AI viewing asks per day.

Pro — $4.99/month or $19.99/year

Unlimited AI viewing asks. Auto-renews. Cancel anytime in Apple Settings → Subscriptions.

Privacy

NightSky Book keeps your notes on your iPhone. No accounts. No analytics. Coach questions are sent to a Cloudflare Worker that forwards them to a hosted Llama model. Full privacy policy.