Astral Book
Stargazing Observation Journal
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Still writing telescope sessions in a notebook? Log seeing, transparency, gear & photos on-site. Works fully offline. One-time Pro upgrade — no subscription.
The easiest way to log your stargazing sessions.
Astral Book is an astronomy observation journal for amateur astronomers. After each session at the eyepiece, record your targets, seeing, transparency, equipment, and photos — all in one place. No internet needed, even at remote dark sky sites.
【What You Can Do】
▷ Observation Log
Record object name, object type (planet, moon, star, nebula, cluster, comet, meteor & more), date/time, location, seeing (1–5), transparency (1–5), notes, and photos. Search and filter past sessions by object, notes, date, location, or equipment.
▷ Calendar View
See which nights you observed on a monthly calendar. Swipe to browse months and revisit your history at a glance.
▷ Target List
Add objects you want to observe. Log a session for any target and it's automatically marked as done and removed from the list.
▷ Messier Catalog
Browse all 110 Messier objects. Observed objects are automatically checked off so you can track your Messier completion progress.
▷ Same Object History
From any log entry, quickly see every time you've observed the same object — when, where, and under what conditions.
▷ Observation Sites
Save your favorite dark-sky sites with Bortle scale ratings.
▷ Night Mode
Switch to a red-tinted theme that protects dark adaptation while you're at the eyepiece.
▷ Observation Card Sharing
Generate a visual observation card and share it via social media or messaging.
▷ CSV / ZIP Export & Import (Free)
Export observations as CSV. Create a ZIP backup with photos, sites, equipment, and wish list. Restore from a previously exported CSV or ZIP.
▷ PDF Export (Free)
Export your observation journal as a PDF report to share or print.
▷ Equipment Management (Pro)
Register your telescopes, eyepieces, and cameras, then link them to your logs. One place to see what you used to observe what.
▷ Saved Gear Sets (Pro)
Save favorite telescope + eyepiece + camera combos as templates so logging a session takes one tap.
▷ Observation Statistics (Pro)
Charts for total sessions, unique object types, monthly session counts, and sessions by site — see your observing patterns over time.
【Who It's For】
・Observers tired of notebooks or notes apps with no search or statistics
・Visual observers who want to properly track seeing and transparency
・Observers who want to review results by telescope or binoculars
・Messier catalog chasers tracking their progress
・Anyone keeping a "next target" wish list
・Astronomy club members sharing observation reports
・Observers at multiple sites from backyard patio to remote dark sky
【Your Data Stays With You】
All data is stored locally on your iPhone/iPad. Nothing is sent to the cloud or any external server. No account required. No risk of losing years of records if a service shuts down. Use ZIP backup to move data when changing devices.
【Fully Offline】
Works completely without internet at remote dark-sky sites. No connection required (except during in-app purchase processing).
【Pricing】
・Free: up to 20 observation logs (includes CSV / ZIP / PDF export & import)
・Astral Book Pro (one-time purchase): regional pricing — unlimited logs + equipment management + statistics
One purchase. No subscription. No recurring fees.
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Developer: Kore Apps
Support: support@kore-apps.com
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Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
[Observation cards]
• Observation cards now come in 4 sizes: Square, Portrait, Story, and Landscape
• Choose up to 6 details to show on each card (location, seeing, transparency, equipment, memo, and more)
• Your size and detail choices are remembered next time
• Minor bug fixes and stability improvements
The developer, kazuki korenori, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- kazuki korenori
- Size
- 56.5 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Astral Book Pro $5.99
- Copyright
- © KoreApps