How Deep Sky Monitor compares

Looking for a free alternative to Stellarium or SkySafari for the deep sky? Compare Deep Sky Monitor with Stellarium, SkySafari, Telescopius and SkyTools, feature by feature: finding galaxies and nebulae, planning what to observe tonight, astrophotography framing and mosaics, and free astronomy data.

Updated automatically with every new Deep Sky Monitor feature (latest: 12 November 2026). Details for other tools come from their official feature lists, reviewed 12 November 2026.

Feature coverage

35 features compared

Deep Sky Monitor 89%
Stellarium 60%
SkySafari 69%
Telescopius 67%
SkyTools 74%

Yes counts 1, partial ½. The features are the ones a deep-sky observer asks about, chosen by us, so read the areas below rather than this one number.

Deep-sky discovery & learning Leads us 94% · best other 72% Sky visualisation Leads us 100% · best other 75% Observation planning On par us 86% · best other 91% Astrophotography On par us 92% · best other 100% Data, sharing and devices On par us 70% · best other 70% Left out on purpose Left out on purpose

Deep-sky discovery & learning

Leads

Feature	Deep Sky Monitor	Stellarium	SkySafari	Telescopius	SkyTools
Object catalogue25,000+ on the map, every NGC/IC object, 624 object pages	✅	✅	✅	✅	✅
Browse by constellation88 constellation pages, filters on objects and the planner	✅	✅	✅	✅	Partial
Detailed object factsdistance with its method, size, brightness, SIMBAD facts	✅	✅	✅	✅	✅
Scientific references (SIMBAD, VizieR, NED)	✅✅✅	Partial	✅	Partial	✅
Plain-words explanations and glossaryExplain mode, 51 glossary terms	✅✅✅	Partial	Partial	—	Partial
Black holes, quasars and extreme objects60 with their own pages	✅✅✅	Partial	Partial	—	Partial
Live cosmic events (gravitational waves, neutrinos, radio bursts, gamma-ray bursts)	Partial	—	—	—	—
Guided sky toursstars, gravitational waves, pulsar glitches, cosmic oddities, with infographics	✅	Partial	Partial	—	—
Search with suggestionsnames, nicknames, catalogue numbers, constellations	✅	✅	✅	✅	✅

Sky visualisation

Leads

Feature	Deep Sky Monitor	Stellarium	SkySafari	Telescopius	SkyTools
Live sky map	✅	✅	✅	✅	✅
Real survey imagery (DSS, Pan-STARRS)	✅✅✅	Partial	Partial	✅✅✅	Partial
Sky in other wavelengths (infrared to gamma rays)	✅✅✅	—	—	—	—
Download the view (JPEG, FITS with coordinates)	✅	Partial	Partial	✅	Partial

Observation planning

On par

Feature	Deep Sky Monitor	Stellarium	SkySafari	Telescopius	SkyTools
Best viewing time	✅	✅	✅	✅	✅
Any night, not only tonight	✅	✅	✅	✅	✅
Night chart: darkness, the Moon, heights	✅	✅	✅	✅	✅
Observing lists and ready-made plans	✅	✅	✅	✅	✅
Can I see it? (your telescope and sky)	✅	—	Partial	Partial	✅✅✅
Filter advice (OIII, UHC, H-beta)	✅	—	Partial	—	✅
Observing logwith OpenAstronomyLog export	✅	Partial	✅	✅	✅
Export plans (Stellarium, NINA, spreadsheet)	✅	✅	✅	✅	✅
Share a plan by link	✅	—	—	Partial	—
Recommendations for tonight"best picks" by visibility and kind	Partial	—	Partial	Partial	✅
Observing programmes (Messier, Caldwell, Herschel 400)	Planned	Partial	✅	Partial	✅

Astrophotography

On par

Feature	Deep Sky Monitor	Stellarium	SkySafari	Telescopius	SkyTools
Telescope profilesseveral profiles via My Sky Profile	✅	✅	✅	✅	✅
Camera and eyepiece profilesone camera and eyepiece per profile for now	Partial	✅	✅	✅	✅
Field-of-view simulatorcamera frame and eyepiece circle on the real sky	✅	✅	✅	✅✅✅	✅
Imaging target rankingdark hours, how it fills your frame, the Moon	✅	—	—	✅	✅
Mosaic planningpanel grid on the map, panel positions, NINA file	✅	—	—	✅	✅
Framing for your camera"Fills 45% of your frame" or the mosaic it needs	✅	Partial	✅	✅	✅

Data, sharing and devices

On par

Feature	Deep Sky Monitor	Stellarium	SkySafari	Telescopius	SkyTools
Open data and free API9 datasets as CSV or VOTable, with licences	✅✅✅	—	—	—	—
Your data stays with you (no account)profiles as a file or magic link, nothing kept on a server	✅	Partial	Partial	Partial	Partial
Works with other programsfiles for Stellarium and NINA	Partial	✅	✅	✅	✅
Offline use / installable app	Planned	✅	✅	—	✅
Free to useeverything, no sign-up	✅	✅	Partial	Partial	—

Left out on purpose

Feature	Deep Sky Monitor	Stellarium	SkySafari	Telescopius	SkyTools
Planetarium view with horizon and landscape The map shows the real sky from survey photographs instead	Left out	✅✅✅	✅✅✅	✅	Partial
3D sky simulation The map stays with real images of the sky	Left out	✅	✅	—	—
Point your phone at the sky (AR) Needs a phone app; this is a website	Left out	Partial	✅	—	—
Telescope control Needs hardware drivers, which a website cannot reach	Left out	✅	✅	—	✅
Weather and seeing forecasts Outside the deep-sky focus	Left out	—	Partial	✅	✅
Planets, eclipses and Solar System events Outside the deep-sky focus	Left out	✅	✅	✅	✅

Where we stand out

Features we have in full that none of the others do.

Plain-words explanations and glossary Explain mode, 51 glossary terms
Black holes, quasars and extreme objects 60 with their own pages
Guided sky tours stars, gravitational waves, pulsar glitches, cosmic oddities, with infographics
Sky in other wavelengths (infrared to gamma rays)
Share a plan by link
Open data and free API 9 datasets as CSV or VOTable, with licences
Your data stays with you (no account) profiles as a file or magic link, nothing kept on a server

Still to come

What other tools have that we don't, or not yet in full. Planned ones are on our roadmap.

Recommendations for tonight Partial
Observing programmes (Messier, Caldwell, Herschel 400) Planned
Camera and eyepiece profiles Partial
Works with other programs Partial
Offline use / installable app Planned

Something wrong about another tool? Tell us at connect@deepskymonitor.in and we will correct it. Names belong to their owners; this page is our own reading of their public feature lists. See also how mature this portal is.