CEMA vs DB
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CEMA
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Aplikace je přístupná pouze uživatelům CEM2. Zobrazuje přehledy spotřeb energií, přehledy modulů, senzorů a vyúčtování.
DB
Measure sound levels with high precision in real-time. Get detailed reports, share data easily, and export audio. Features a minimalist design for quick measurements.
- High precision real-time measurement
- Location information for measurements
- Detailed measurement reports
- One-click sharing of data
- Export audio data
- Minimalist design
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An app that can provide real-time distributed data, with the following features: -High precision measurement, real-time measurement -Provide location information for measurement -Provide detailed measurement reports -One click sharing of measurement data -Support exporting audio data -Minimalist design, one click measurement -Supporting decibel meter data I Payment: The user deducts the payment through their iTunes account and makes the payment upon confirmation of purchase II Renewal: The user's iTunes account will be charged within 24 hours before expiration, increasing the corresponding subscription period III Cancel Renewal: To cancel the renewal, go to "iTunes Store and App Store" ->click "App ID", go to the "Account Settings" page, click "Subscription", and select unsubscribe IV Privacy Agreement: https://docs.qq.com/doc/DVGVuV3BPSnFieEhl V、 Terms of Use: https://docs.qq.com/doc/DVEtuRkJ1bGxoR3RS
Screenshots
Verdict
The clearest difference is in-app purchases: CEMA at none against DB's 3. On price, update cadence, ads 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. DB sells 3 in-app purchases, starting at $3.99 per 7 days. CEMA asks for nothing beyond the download.
CEMA ships an update every 7 months, DB every 5 months. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.
| Parameter | CEMA | DB |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.5 (37 ratings) — better |
| Positive reviews | — | 3.8% of reviews |
| Number of ratings | — | 37 — better |
| Update frequency | Every 7 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 34 MB | 60 MB |
| Age rating | 4+ | 9+ |
| Developer | Softlink s.r.o. | Guangzhou Linke Technology Co., Ltd |
In-app purchases
CEMA
No in-app purchases
DB
- Weekly membership3 Days trial$3.997 Days
- Monthly membership3 Days trial$4.991 Month
- Yearly memberShip3 Days trial$14.991 Year
