Comparison

LexiBot vs Astro Viewer

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

Head to head
About

LexiBot

Features
Read full description

VocabMaster – AI-Powered Language Learning VocabMaster helps you learn vocabulary and improve your speaking skills efficiently using advanced AI algorithms. Perfect for students, language enthusiasts, and exam prep. Key Features: Smart Vocabulary: AI-optimized memorization for faster retention. Speaking Practice: Read aloud, build sentences, and practice real-life conversations. Multi-Language Support: English, French, German, Russian – all in one app. Text Processing: Extract new words, generate example sentences, and streamline review. Use Cases: Quickly boost your vocabulary for school or personal learning. Prepare for exams like CET-4/6, IELTS, DELF, Goethe, and more. Daily speaking practice to overcome “silent language” barriers. Join TestFlight: https://testflight.apple.com/join/uPggS41R -- VocabPal AI Speaking Key Features: Smart Vocabulary Learning: AI-powered memorization for faster word mastery Speaking Practice: Read-aloud & sentence-building for real-life fluency Multi-Language Support: English, French, German, Russian in one app Text Processing: Extract new words & generate example sentences for better review Perfect For: Students & language learners expanding vocabulary Test prep (CET, IELTS, DELF, Goethe, etc.) Daily speaking practice – speak confidently!

About

Astro Viewer

Features
Read full description

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.

Screenshots

LexiBot4 screens
Astro Viewer4 screens

Verdict

The call

The clearest difference is update cadence: LexiBot at every 2 days against Astro Viewer's every 4 months. Astro Viewer's advantage is iOS requirement (15.6 vs 17.0). 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

LexiBot ships an update every 2 days, Astro Viewer every 4 months. The most recent releases landed on October 25, 2026 and October 15, 2026 respectively.

Scorecard2 real differences · 4 level
LexiBot versus Astro Viewer: the parameters behind the verdict, then further details
ParameterLexiBotAstro Viewer
PriceFreeFree
Update frequencyEvery 2 days — betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.6 — better
Further details — not scored
Size47 MB20 MB
Age rating4+4+
Developer祥华 赵Heebok Lee

In-app purchases

None

LexiBot

No in-app purchases

None

Astro Viewer

No in-app purchases

Questions

Is LexiBot free?
LexiBot is free to download, with no in-app purchases.
Is Astro Viewer free?
Astro Viewer is free to download, with no in-app purchases.
Do LexiBot or Astro Viewer have ads?
Neither LexiBot nor Astro Viewer shows ads.
Which is updated more often, LexiBot or Astro Viewer?
LexiBot ships an update every 2 days, and Astro Viewer every 4 months. Most recently, LexiBot was updated on October 25, 2026 and Astro Viewer on October 15, 2026.

Other comparisons