OpeNoise vs Rosetta key
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OpeNoise
This application measures real-time sound pressure levels, displaying minimum and maximum values. It offers advanced analysis like third octave and FFT, with options to save data, calibrate, and share measurements with a community. Note: it is not intended for professional use.
- Real-time A-weighted sound pressure level measurement
- Minimum and maximum level tracking
- Third octave and FFT analysis
- Data saving in text file
- Calibration functionality
- Measurements displayed on a map
- Community sharing of calibration and measurements
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OpeNoise is a real-time noise level meter. TECHNICAL SPECIFICATIONS: - Real-time A-weighted sound pressure level measurement - Minimum and maximum level - Third octave and FFT analysis - Data saving in text file - Calibration - Displaying measurements on a map - Metadata compilation - Sharing calibration and measurements with the OpeNoise community TERM OF USE This app is not intended for professional use, it does not necessarily guarantee an accurate noise measurement. Since each device has a different response to noise, a comparison with a professional noise level meter in the measurement dynamic range is required. The utilization of the app requires adequate technical knowledge and skill; an extemporary measurement might not be correct. The calibrations and measurements sent to the OpeNoise community will be used for statistical purposes only and cannot be used in any way to verify compliance with legal limits. CREDITS Developers: Arpa Piemonte (Regional Agency for the Protection of the Environment of Piedmont - Italy - www.arpa.piemonte.it). The code is open source under GNU v.2 license or later, the code is on GitHub: https://github.com/Arpapiemonte/ KEYWORDS noise level meter, level, sound, noise, measure, measurement, dB, db, dBA, dB(A), decibel
Rosetta key
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Rosetta Key is a simple app for encrypting and decrypting messages using a shared phrase. Write a message, choose a secret phrase, and the app creates encrypted text that you can copy and share in other apps. Anyone who knows the same phrase can decrypt the message. Encryption happens locally on your device. The app is designed for personal and private communication and does not automatically access your chats, accounts, or messages. With Rosetta Pro, you can encrypt without limits and use a saved phrase with the Rosetta keyboard. Main features: encrypt messages, decrypt messages, use a shared phrase, Rosetta keyboard for faster writing, local processing on your device, no automatic access to messaging apps or accounts. Rosetta Key does not replace professional security advice and does not guarantee absolute security. Security also depends on the strength and secrecy of your chosen phrase. Terms of Use (EULA): https://www.mensirax.com/rosetta/en/terms.html
Screenshots
Verdict
The clearest difference is in-app purchases: OpeNoise at none against Rosetta key's 2. On price, ads, device support and iOS requirement 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. Rosetta key sells 2 in-app purchases, starting at $3.99 per month. OpeNoise asks for nothing beyond the download.
| Parameter | OpeNoise | Rosetta key |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (4 ratings) — better | — |
| Positive reviews | 85.7% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 7 months | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 12 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Agenzia Regionale per la Protezione Ambientale del Piemonte | Greencommerce |
In-app purchases
OpeNoise
No in-app purchases
Rosetta key
- Rosetta Pro3 Days trial$3.991 Month
- Rosetta Pro3 Days trial$34.991 Year









