Built for ZWO SeeStar

Nebulis Your universe. Captured.
Beautifully organized.

A full image library, observation planner, and sky forecast for your ZWO SeeStar smart telescope. Every session cataloged. Every object enriched with Messier, NGC, and IC data.

Download Free See what it does

🍎macOS 🪟Windows 📱iOS 📺tvOS 🤖Android 🐳Docker

5,000+

Deep-sky objects

Messier · NGC · IC · Sharpless

Platforms

Mac · Win · iOS · tvOS · Android · Docker

FITS + JPG

File support

Headers · subframes · thumbnails

100%

Local & private

No cloud account required

Everything in one place

Built around how you
actually observe

From the first SMB connection to a polished gallery of stacked nebulae, Nebulis handles every step.

Image Library

Every capture from your SeeStar, thumbnailed and cataloged automatically. Filter by galaxy, nebula, cluster, date, or telescope. Star your favorites.

Observation Planner

See real altitude curves for every object tonight. Build a wishlist, rank targets by visibility window, and know exactly when to shoot.

Sky Forecast

Cloud cover, atmospheric seeing, moon phase, and humidity combined into a single visibility score for each hour of the night.

FITS Viewer

Inspect raw FITS headers, view individual subframes, and compare stacked vs. raw captures side by side. Full BITPIX 8/16/32 support.

Satellite Detection

Radon-projection analysis finds satellite and airplane trails in your FITS frames so you can flag or discard them before stacking.

iOS · tvOS · Android

Browse your full image library from your iPhone, iPad, Apple TV, or Android device. Same library, every screen.

Night Mode

Red-light display mode preserves your dark-adapted vision while you check targets at the eyepiece.

Multi-telescope

Manage multiple SeeStar units from one interface. Each scope keeps its own library while sharing the same catalog and planner.

Observation Calendar

A full history of every session, organized by date. Review notes, replay altaz charts, and track your progress over time.

Observation Planner

Know exactly what
to shoot tonight.

The planner pulls your location and calculates live altitude curves for every object in the NGC, Messier, IC, and Sharpless catalogs. Add targets to your wishlist and Nebulis ranks them by peak visibility window.

Altitude and azimuth curves for any date
Wishlist management with one tap
Rank targets by peak altitude and window
Catalog image preview for every object

Sky Forecast

Astronomy-specific
weather, hourly.

Generic weather apps don't tell you about atmospheric seeing or moon phase. Nebulis combines cloud cover, humidity, seeing index, and moon illumination into a single 0–100 visibility score for every hour of the night.

Per-hour cloud cover, seeing, and moon phase
Composite 0–100 visibility score
Sunset and astronomical twilight markers
Automatic location detection

Observation Log

Every session,
cataloged.

Nebulis automatically organizes every capture into a per-object observation log. Stack counts, exposure totals, conditions, and the resulting frames — all in one place, ready to revisit or share.