Astro Viewer vs Astro!
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Astro Viewer
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Astro Viewer is your ultimate gateway to the universe, powered by multiple world-class space agencies and observatories. Access thousands of stunning astronomical images from NASA, ESA/Hubble, ESA/Webb, and ESO. Whether you are a student, an educator, or a space enthusiast, explore the cosmos through multiple telescopes and perspectives like never before. WHAT'S NEW: MULTI-AGENCY EXPANSION Now featuring four major astronomical image sources: - NASA Open API - Space exploration imagery - ESA/Hubble Space Telescope - Iconic optical observations - ESA/Webb Space Telescope - Infrared universe revelations - ESO Public Archives - Ground-based astronomical excellence Experience the universe through the world's most powerful telescopes! KEY FEATURES Break Language Barriers: Search in Any Language - Supports 130+ languages via intelligent auto-translation - Type "Andromeda" in Korean, Japanese, French, or any other language - Smart search engine queries multiple databases and delivers unified results - Auto-translation instantly converts descriptions of galaxies, nebulae, and black holes to your native language Educational & Bilingual Tools - Original vs. Translated Toggle: Switch between translated and original English text with a single tap—perfect for learning astronomical terms! - Detailed Metadata: Access photographer credits, observation dates, telescope specifications, and celestial keywords - Multi-Source Attribution: See which telescope/observatory captured each image Massive Astronomical Library - Multi-Agency Integration: Thousands of high-resolution images from NASA, Hubble, Webb, and ESO - Curated Catalog: Browse hand-picked selections of famous celestial objects (M31, M42, NGC series) - Smart Filtering: Focused purely on stunning celestial imagery—no administrative photos - Diverse Perspectives: Compare optical (Hubble), infrared (Webb), and ground-based (ESO) views Save & Share the Wonder - High-Resolution Downloads: Save breathtaking space wallpapers directly to your gallery - Contextual Sharing: Share images with friends via social media—text adapts to your language preference - Multi-Source Credits: Proper attribution to NASA, ESA, or ESO included Immersive Experience - Interactive Viewer: Zoom and pan to explore every stellar detail - Dark Mode UI: Sleek interface minimizing eye strain while viewing space imagery - Seamless Navigation: Browse across multiple archives effortlessly WHY ASTRO VIEWER? The universe is vast, but exploring it shouldn't be complicated. Astro Viewer combines the scientific depth of world-leading space agencies with the accessibility of modern translation technology. See the cosmos through Hubble's optical clarity, Webb's infrared vision, ESO's ground-based power, and NASA's exploration legacy—all in one app. It's not just a gallery; it's a comprehensive learning tool that brings the universe to your fingertips. Download Astro Viewer today and start your multi-telescope journey through the stars! DISCLAIMER This application is a third-party educational tool developed by an independent developer. It utilizes publicly available APIs from NASA, ESA (European Space Agency), and ESO (European Southern Observatory) to fetch astronomical images, but is NOT affiliated with, endorsed by, or an official product of NASA, ESA, or ESO. Data sources: - NASA's Open API (api.nasa.gov) - ESA/Hubble Space Telescope Archive (esahubble.org) - ESA/Webb Space Telescope Archive (esawebb.org) - ESO Public Image Archive (eso.org) According to their respective media usage guidelines, this content is generally available for educational and non-commercial use. Hubble and Webb are joint projects of NASA and ESA. ESO operates ground-based observatories in Chile.
Astro!
Explore the cosmos with daily NASA images and engaging facts about space. Discover stargazing tools and upcoming celestial events. Perfect for anyone curious about the universe, science, and learning new things about the night sky.
- Daily NASA space images
- Simple explanations of celestial phenomena
- Interesting astronomy facts
- Stargazing tools
- Upcoming space event notifications
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Discover your passion of outer space and learn about the universe. This app shows a daily NASA space image with simple explanations, interesting astronomy facts, stargazing tools, and upcoming space events. It is made for anyone who is interested in space, science, physics, or learning something new about the sky.
Screenshots
Verdict
The clearest difference is update cadence: Astro! at every 2 months against Astro Viewer's every 4 months. Astro! also leads on iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Astro Viewer ships an update every 4 months, Astro! every 2 months. The most recent releases landed on October 15, 2026 and October 7, 2026 respectively.
| Parameter | Astro Viewer | Astro! |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (7 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 7 — better |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 20 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Heebok Lee | LARA NELLE SCARBOROUGH |
In-app purchases
Astro Viewer
No in-app purchases
Astro!
No in-app purchases









