Comparison

Chandra 20 Years & Beyond vs ASGuide

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Chandra 20 Years & Beyond

Explore two decades of cosmic discoveries with this image explorer. View composite, X-ray, and optical wavelengths of wondrous objects, watch films, and zoom into detailed images. Future updates promise more insights into the universe's mysteries.

Highlights
  • Explore cosmic objects across wavelengths
  • View 11 photo albums
  • Watch Chandra films
  • Zoom into detailed images
  • Share images
  • Read object captions
Features
Read full description

CHANDRA SCIENCE: WONDROUS OBJECTS! This is the Chandra Extreme, an image explorer into the past two decades in which Chandra has made profound discoveries and contributed invaluable information about the cosmos and the wondrous objects within it. PLUS, Future updates of Chandra Extreme is a front seat window into the next years of images produced from solving the mysteries of the Universe. • Move between different wavelengths of each object, along the touch slider • Composite, Xray, Optical and other wavelengths may be featured. • 11 Photo Albums • Watch Chandra Films • Explore Chandra spotlighted images • View captions for objects • Pinch Zoom into bigger images • Share images

About

ASGuide

Explore the night sky with this astronomy companion. Discover planets, galaxies, nebulae, and more visible from your location. Generate custom viewing lists and preview celestial objects with an interactive sky atlas.

Highlights
  • Discover celestial objects visible from your location
  • Generate custom viewing lists
  • View detailed observation information
  • Interactive sky atlas preview
  • Dark mode for nighttime viewing
  • Sunrise/sunset and moon phase dashboard
Features
Read full description

Discover the wonders visible in your sky tonight. ASGuide (Astronomy Sky Guide) turns your location and observing time into a personal guide to the night sky. Discover visible planets, galaxies, nebulae, stars, star clusters, and galactic regions. Plan an observation, explore from home, or find your next celestial target. Find objects worth viewing and learn more about every discovery: - See what is visible from your location and when to observe it. View rise, transit, and set times. - Filter by magnitude, altitude above the horizon, constellation, object type, and more. - Search by common name, catalog number, constellation, object type, or detailed classification. - Browse the solar system and deep-sky categories. - Return quickly to recent searches and recently viewed objects. - See which planets are visible. - Save favorite objects for future viewing. - Use your current location or select any location on Earth. - Check sunrise, sunset, twilight, and night times. - Follow the current moon phase, illumination, moonrise, moonset, and the next new and full moons. - Open high-resolution imagery and explore objects with the interactive sky atlas. Customize the Home screen with the information that matters to you. Use the dark appearance for nighttime observations, or the standard iOS appearance. Your next night-sky discovery starts with ASGuide.

Screenshots

Chandra 20 Years & Beyond4 screens
ASGuide4 screens

Verdict

The call

The clearest difference is rating: Chandra 20 Years & Beyond at 5.0 against ASGuide's 4.8. Chandra 20 Years & Beyond also leads on device support (3 vs 1) and iOS requirement (9.0 vs 18.0). ASGuide's advantage is ratings volume (9 vs 2). On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Chandra 20 Years & Beyond holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 2 and 9 respectively.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
Chandra 20 Years & Beyond versus ASGuide: the parameters behind the verdict, then further details
ParameterChandra 20 Years & BeyondASGuide
PriceFreeFree
Rating5.0 (2 ratings) — better4.8 (9 ratings)
Positive reviews—100.0% of reviews
Number of ratings29 — better
Update frequencyEvery 4 monthsEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS9.0 — better18.0
Further details — not scored
Size98 MB33 MB
Age rating4+4+
DeveloperSmithsonian InstitutionPhilip Perez

Customer experience

Chandra 20 Years & Beyond

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

ASGuide

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Chandra 20 Years & Beyond

No in-app purchases

None

ASGuide

No in-app purchases

Questions

Is Chandra 20 Years & Beyond free?
Chandra 20 Years & Beyond is free to download, with no in-app purchases.
Is ASGuide free?
ASGuide is free to download, with no in-app purchases.
Which has better reviews, Chandra 20 Years & Beyond or ASGuide?
Chandra 20 Years & Beyond is rated higher. Chandra 20 Years & Beyond averages 5.0 out of 5 from 2 ratings, while ASGuide averages 4.8 from 9 ratings.
Do Chandra 20 Years & Beyond or ASGuide have ads?
Neither Chandra 20 Years & Beyond nor ASGuide shows ads.
Which is updated more often, Chandra 20 Years & Beyond or ASGuide?
Chandra 20 Years & Beyond ships an update every 4 months, and ASGuide every 4 months. Most recently, Chandra 20 Years & Beyond was updated on October 29, 2026 and ASGuide on October 24, 2026.

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