NAPA vs ARSA ENIGMA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NAPA
Explore the night sky with this astronomy and planetarium app. Identify stars, constellations, and planets by pointing your device at the sky. Plan future observations by adjusting the time and date.
- Point and observe celestial objects
- Star map functionality
- Time adjustment for observation planning
- Simulate planet positions
- Locate specific celestial objects
- Real images of deep sky objects
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NAPA - Star Map NARIT Astronomy & Planetarium Application, or “NAPA” is an astronomy and planetarium app that will help guide you to the night sky. Identify those dots in the sky. Learn about stars, constellations, planets, and other deep sky objects by simply pointing your phone at the sky. Adjust the time and NAPA can be used as a star map to help plan your future observation. Familiarize yourself and learn more about the patterns that make up the night sky. Select and use NAPA to locate deep sky objects that you can locate with a binocular or small telescope. NAPA is made by professional and amateur astronomers, along with public outreach professionals with the aim to help bridge the gap, making astronomy accessible to everyone. This app is made free to use with the aim to assist schoolteachers and public outreach personnels with their engagement with the public. Unlock the pro version (coming soon) to access the full potential of this app. Turn your phone into powerful tools that can help you with your observation and stargazing events with features that will assist in your astronomical needs. NAPA features: • Point and observe: Display the celestial objects in the position of the sky that your smart device is pointing at. • Point and drag the screen to turn this app into a star map. • Adjust the time to plan your observations at any given date and time. • Simulate the positions of planets that you can see at any time. • Select constellations, planets, or deep sky objects of interest and locate its position in the sky. • Real images of deep sky objects
ARSA ENIGMA
Securely encrypt and decrypt files for private sharing. Protect your data from leaks, fraud, and scams with this utility app. It offers multiple encryption levels for varying device capabilities.
- File encryption
- File decryption
- Secure data sharing
- Private key management
- Bilinear encryption (2 layers)
- Trilinear encryption (3 layers)
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User can sharing his/her data with protection guard to public instant message with no concern about data leak, fraud or scam. How to use. Encryption: 1. Choose original file from the third party app and touch on share icon for sending a file to ARSA ENIGMA (share from third party app directly, not in ARSA ENIGMA, center image in app is just Hero graphic not an icon) 2. When encryption process done then sharing popup show on screen. 3. Share to any app that you want. Decryption: 1. Choose encryption file from the third party app and touch on share icon for sending a file to ARSA ENIGMA (share from third party app directly, not in ARSA ENIGMA, center image in app is just Hero graphic not an icon) 2. When decryption process done then sharing popup show on screen. 3. Share back the original file to any app that you want. Private Key: The Private Key will initialize when app run first time, User should backup your own private key and kept be high security, do not share to other people that you don’t trust. Important: Private Key difference will cannot decryption file. Bilinear Level: Encryption with 2 layers but slow process if your devices is low-end CPU. Trilinear Level: Encryption with 3 layers, recommended for high-end CPU because this method is use power and speed of device CPU. Share File: When user done process both encryption or decryption, share file button will activation and can share to third party app. Happy Encryption. Best, Dev Team.
Screenshots
Verdict
The clearest difference is rating: ARSA ENIGMA at 5.0 against NAPA's 4.5. ARSA ENIGMA also leads on update cadence (every 3 days vs every 2 months) and review sentiment (100% vs 75%). NAPA's advantage is ratings volume (4 vs 1). On price, ads, in-app purchases and monetization model 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.
ARSA ENIGMA holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews point the same way: 75% of NAPA's written reviews are positive against 100% of ARSA ENIGMA's.
NAPA ships an update every 2 months, ARSA ENIGMA every 3 days. Both last shipped on November 4, 2026.
| Parameter | NAPA | ARSA ENIGMA |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (4 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 75.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 2 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 287 MB | 20 MB |
| Age rating | 4+ | 17+ |
| Developer | National Astronomical Research Institute of Thailand (Public Organization) | Arsa Tangchitsomkit |
Customer experience
NAPA
ARSA ENIGMA
In-app purchases
NAPA
No in-app purchases
ARSA ENIGMA
No in-app purchases









