CM PM2.5 vs NAPA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CM PM2.5
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การบูรณาการข้อมูลตรวจวัด ข้อมูลพยากรณ์จากแบบจำลองคุณภาพอากาศ ข้อมูลจากภาพถ่ายดาวเทียม ข้อมูลเชิงพื้นที่ และการรายงานอย่างเป็นระบบ เพื่อสนับสนุนการตัดสินใจลดความเสี่ยงและผลกระทบจากปัญหาฝุ่น PM2.5 ในพื้นที่จังหวัดเชียงใหม่ ทำให้ทราบสถานการณ์ปัจจุบัน รวมทั้งได้ทราบแนวโน้มของสถานการณ์ในอนาคตอันใกล้ ซึ่งจะช่วยในการวางแผนให้ความช่วยเหลือบรรเทาปัญหาแก่ประชาชนได้อย่างมีประสิทธิภาพ
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
Screenshots
Verdict
The clearest difference is update cadence: CM PM2.5 at every 3 weeks against NAPA's every 2 months. 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.
CM PM2.5 ships an update every 3 weeks, NAPA every 2 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.
| Parameter | CM PM2.5 | NAPA |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.5 (4 ratings) — better |
| Positive reviews | — | 75.0% of reviews |
| Number of ratings | — | 4 — better |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 33 MB | 287 MB |
| Age rating | 4+ | 4+ |
| Developer | Chakrit Chotamonsak | National Astronomical Research Institute of Thailand (Public Organization) |
In-app purchases
CM PM2.5
No in-app purchases
NAPA
No in-app purchases
