Cosmic vs Dehkhoda
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cosmic
Explore the cosmos with this app that offers interactive tools for celestial navigation and astronomical observation. Visualize the sky, Earth, and solar system from multiple perspectives, and discover constellations, planets, and events in augmented reality. It's a blend of ancient wisdom and modern technology for a deeper connection to the universe.
- Multiple celestial perspectives (sky, Earth, solar system)
- Augmented reality sky exploration
- Interactive astronomical and world clocks
- Visualized natal charts (Western, Vedic, Sidereal)
- Day/night cycles on Earth globe
- Celestial navigation guides
- Notifications for astronomical events
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The sky above you, the Earth beneath you, the solar system you move through space. Three perspectives no other app combines this way. For thousands of years humans read the sky to measure time, navigate the Earth, and find meaning in their existence. Astronomy, astrology, and timekeeping were one science. Cosmic Watch reunites them. Free for the first time in ten years. FEATURES (core) • Sky View — stars, planets, and constellations • Earth View — day and night cycle, the cosmos around it • Solar System — geocentric and heliocentric • Celestial sphere — full 360° sky overview, unique to this app • Astrology Mode — Western, Vedic and 3D • Retrograde motion across all planets • World clock and astronomical events • Notifications for eclipses, solstices, and moon cycles • Celestial navigation — orient yourself by the sky Or just watch the Earth float in space and remember where you are. Free to explore. The three views, sky guide, every layer, star names, world clock, and notifications are yours from the first open. Tools and Time Control unlock with a subscription — or forever with Cosmic Pro. Keep the project alive and growing. We read every message you send us. TOOLS (in-app purchase) • Moon Calendar • Real-Time Clouds • Meteor Showers • Comets • Planetary Aspects • Retrograde Year • Dreamspell Calendar • Atmosphere Clockface • Save Date / Time / Location • Time Control — move forward and back, any moment A full app. Not a widget or watch face, yet. Runs on iPhone, iPad, and Apple Silicon Mac Privacy committed: No account required. Analytics never shared. Webby Award for Best Educational App 2018. New York Times. Wired. Space.com. By a Chi Gong master and an animation artist. Still looking up. Time is the Cosmic Rhythm. Terms of Use: https://cosmic-watch.com/termsOfService/ Privacy Policy: https://cosmic-watch.com/privacyPolicy/
Dehkhoda
Access a comprehensive Persian lexicon with over 350,000 entries. Features powerful search modes, offline functionality, and integrated dictionaries for enriched context. Ideal for students, scholars, and language enthusiasts.
- 350,000+ Persian dictionary entries
- 6 powerful search modes
- Offline functionality
- Integrated Steingass and Hayyim dictionaries
- Full transcription for entries
- Optimized for iPhone Duo and multi-column browsing
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Discover the Complete Persian Language Dehkhodā (دهخدا) brings the most comprehensive Persian lexicon to your iPhone and iPad with over 350,000 entries at your fingertips. KEY FEATURES: - 6 powerful search modes - find any word instantly - Search scopes adapt to your layout — a contextual menu when the sidebar is narrow (including iPhone Duo) - Optimized for iPhone Duo and multi-column browsing - Steingass dictionary integration - when entries have matching records in the Steingass database, they are shown in the detail screen for richer context - Hayyim source — matching material when available - Full transcription for thousands of entries - Works completely offline - no internet required - 350,000+ dictionary records - Perfect for students, scholars, and Persian language enthusiasts WHY DEHKHODĀ? Whether you're learning Farsi, researching Persian literature, or exploring your cultural heritage, Dehkhodā provides the depth and accuracy you need. Based on the legendary Dehkhoda Dictionary, this app puts centuries of Persian linguistic scholarship in your pocket. ALWAYS AVAILABLE Your complete Persian library travels with you. Search, learn, and discover - anytime, anywhere, even without an internet connection. Download Dehkhodā today and unlock the richness of the Persian language!
Screenshots
Verdict
The clearest difference is ratings volume: Cosmic at 636 against Dehkhoda's 10. Cosmic also leads on iOS requirement (15.0 vs 18). Dehkhoda's advantage is update cadence (every 6 weeks vs every 6 months) and review sentiment (100% vs 87%). On price, rating, 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
Both are free to download. Cosmic sells 6 in-app purchases, starting at $0.99 per month and Dehkhoda sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.8 for Cosmic against 4.7 for Dehkhoda. That said, the two scores are not equally well evidenced: Cosmic has 636 ratings behind it against 10, so its average is the more settled of the two. Written reviews are what separate them: 87% of Cosmic's written reviews are positive against 100% of Dehkhoda's.
Cosmic ships an update every 6 months, Dehkhoda every 6 weeks. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.
| Parameter | Cosmic | Dehkhoda |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (636 ratings) — better | 4.7 (10 ratings) |
| Positive reviews | 86.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 636 — better | 10 |
| Update frequency | Every 6 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18 |
| Further details — not scored | ||
| Size | 194 MB | 332 MB |
| Age rating | 4+ | 4+ |
| Developer | Celestial Dynamics AG | Maysoft Inc. |
Customer experience
Cosmic
Dehkhoda
Bugs and requests
Cosmic
Reported bugs
3 issues- Date and time not accurately reflected in the solar system view
- Inconsistent behavior when switching between different modes and settings
- Difficulty in maintaining user preferences across sessions
Requested features
5 requests- Add an alarm feature to wake up to different celestial views
- Implement support for Apple Watch and other wearables
- Provide more options to customize the display and information layers
- Include a night mode or dimmer setting for better visibility in low light
- Integrate with other astronomy apps and tools for a more comprehensive experience
Dehkhoda
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Cosmic
- Monthly Plan$0.991 Month
- Monthly$2.991 Month
- Yearly Plan$4.991 Year
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- Yearly$24.991 Year
- Tools Pack$2.99
- Cosmic Pro$69.99
Dehkhoda
- 14-Day TrialFree
- Lifetime Unlock$5.99









