Chakra STEM vs Preap Sar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Chakra STEM
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Chakra is a network of social media platforms that aim to raise awareness and promote action on the environment. Chakra offers various channels for users to learn, share, and engage with environmental topics, such as waste management, plastic recycling, plants, giving, and owning trees. Chakra also showcases the green initiatives and achievements of personal individuals, communities, and organizations. Chakra connects them with global audiences and partners. The app is more than just a social media platform; it is a movement for a greener and more sustainable future.
Preap Sar
A private messaging application offering secure 1:1 and group chats with rich media support. It also includes voice and video calls, identity key backups, and features for connecting with others. Additional tools like personal notes, task management, and a business listing service are also available.
- End-to-end encrypted messaging
- Voice and video calls
- Group and 1:1 chats
- File and media sharing
- Personal notes and tasks
- Business listing and ordering
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+ Messaging — 1:1 and group chats with text, photos, videos, voice notes, files, stickers, and location. Reply, forward, react, and edit messages. Real-time typing and read receipts. + Security — Always-on E2E encryption and back up your identity key. + Calls — Voice and video calls. + Connect — invite friends, find people by @username or QR, and discover nearby users (opt-in). + Multiple accounts + Personal notes and tasks with reminders, loan calculator, expense tracker, khmer calendar + Free business listing and send order (Cash on delivery only) + Unlimited story posts + Offline mode Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://preapsar.com/en/privacy
Screenshots
Verdict
The clearest difference is update cadence: Preap Sar at every 2 days against Chakra STEM's monthly. Chakra STEM's advantage is iOS requirement (13.0 vs 15.0). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Chakra STEM ships an update monthly, Preap Sar every 2 days. The most recent releases landed on October 25, 2026 and October 19, 2026 respectively.
| Parameter | Chakra STEM | Preap Sar |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Monthly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 57 MB | 93 MB |
| Age rating | 17+ | 17+ |
| Developer | Ministry of Environment Cambodia | Savun Cheam |
In-app purchases
Chakra STEM
No in-app purchases
Preap Sar
No in-app purchases
Questions
Is Chakra STEM free?
Is Preap Sar free?
Do Chakra STEM or Preap Sar have ads?
Which is updated more often, Chakra STEM or Preap Sar?
Other comparisons
