Celestia vs Readvora
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Celestia
Explore the universe in real-time 3D. Visit planets, moons, star clusters, and galaxies, viewing them from any point in space and time. Customize your experience with expandable content and detailed simulations.
- Real-time 3D space visualization
- Explore planets, moons, stars, galaxies
- Accurate solar system object positions
- Interactive planetarium mode
- Expandable content with add-ons
- Customizable celestial databases
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Celestia — real-time 3D visualization of space 3D Space Simulator | Celestia lets you explore our universe in three dimensions. Celestia simulates many different types of celestial objects. From planets and moons to star clusters and galaxies, you can visit every object in the expandable database and view it from any point in space and time. The position and movement of solar system objects is calculated accurately in real time at any rate desired. Interactive Planetarium | Celestia serves as a planetarium – for an observer on any celestial object. You can easily navigate to any world and land on its surface. When used as a planetarium, Celestia shows accurate positions of solar system objects in the sky. You can switch labels and other supporting features on and off with hotkeys, or zoom in and out on an object of interest, for example Jupiter’s system of moons. Expandable Content | Customize Celestia according to your needs. Celestia’s catalogues can be easily expanded. There are many different add-ons available containing new objects like comets or stars, high-resolution textures of Earth and other well mapped solar system bodies, as well as 3D models for asteroids and spacecraft on precise trajectories. Even fictional objects from well-known sci-fi franchises can be found. EULA(End User License Agreement): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Readvora
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Readvora – Speed Reading & Focus Trainer Train your brain to read faster and retain more. Readvora turns any PDF, book, or article into a focused reading session — powered by proven speed reading techniques. How It Works Load any document and let Readvora guide your eyes. Choose your reading mode, set your pace, and watch your words-per-minute climb — session by session. Reading Modes • RSVP: Flash one word at a time directly to your focus point. Zero eye movement, maximum speed. • Chunk Mode: Read 2–5 words at a time for a natural rhythm with higher throughput. • Bionic Reading: The first half of each word is bolded — your brain fills in the rest automatically. • Classic Scroll: Traditional reading with full speed and font controls. Document Support • Import PDFs from your device or cloud storage • Read EPUB and TXT files • Paste any text for instant reading Speed & Control • Adjustable speed from 100 to 1500 WPM • Auto WPM Trainer: gradually increases your pace over time • Pause, rewind, or skip forward at any moment • Repeat difficult words or sections instantly Track Your Progress • Live WPM display during every session • Daily, weekly, and monthly reading statistics • Total words and pages read • Personal speed records and growth charts • Session time tracking Streaks & Achievements • Daily reading streak to build consistent habits • Badges and milestones as your speed improves • Weekly reading goals you set yourself Personalize Your Experience • Light, Dark, and OLED themes • Font style, size, and line spacing controls • Focus point color and position • Full distraction-free reading mode Three Subscription Plans • Free: 3 PDFs per day, up to 300 WPM, RSVP mode only • Pro Monthly: Unlimited documents, all reading modes, full stats, multi-device sync, ad-free • Pro Yearly: Everything in Pro Monthly at 50% savings with early access to new features Completely Offline Your library and reading sessions work without an internet connection. Read anywhere, anytime. 10 Languages Supported English, Turkish, Spanish, French, German, Portuguese, Russian, Japanese, Chinese, and Arabic. Privacy Policy: https://www.urhoba.com/pages/privacy-policy-for-readvora Terms of Use: https://www.urhoba.com/pages/terms-of-use-for-readvora
Screenshots
Verdict
The clearest difference is ads: Celestia at none against Readvora's shown. Celestia also leads on update cadence (every 2 weeks vs every 5 weeks) and device support (4 vs 1). On price, in-app purchases and iOS requirement 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. Celestia sells 4 in-app purchases, starting at $0.99 per 7 days and Readvora sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Celestia ships an update every 2 weeks, Readvora every 5 weeks. The most recent releases landed on September 28, 2026 and September 20, 2026 respectively.
| Parameter | Celestia | Readvora |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (324 ratings) — better | — |
| Positive reviews | 78.3% of reviews | — |
| Number of ratings | 324 — better | — |
| Update frequency | Every 2 weeks — better | Every 5 weeks |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 545 MB | 56 MB |
| Age rating | 4+ | 4+ |
| Developer | 林峰 李 | Ahmet Bohur |
Bugs and requests
Celestia
Reported bugs
3 issues- Milky Way and other galaxy textures not loading properly
- Crashes when using certain add-ons
- Issues with planet and moon orbits not being accurate
Requested features
5 requests- Add more exoplanets and distant star systems
- Implement terrain generation for planets
- Expand to include more galaxies and the overall universe structure
- Add support for black holes, pulsars, and other exotic objects
- Improve controls and camera movement
Readvora
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Celestia
- Celestia PLUS (Weekly)7 Days trial$0.997 Days
- Celestia PLUS (Monthly)$1.991 Month
- Celestia PLUS (Yearly)$19.991 Year
- Celestia PLUS (Lifetime)$79.99
Readvora
- One Week Premium$1.997 Days
- One Month Premium$4.991 Month
- One Year Premium$29.991 Year









