OpeNoise vs Biodiversa
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
Biodiversa
Identify plants and contribute to biodiversity monitoring by snapping photos. Engage in challenges, learn about species, and join a community dedicated to ecosystem conservation. This app turns outdoor exploration into an educational and protective adventure.
- Photo-based plant recognition
- Contribute to scientific database
- Learn about species and biodiversity
- Participate in community challenges
- Explore and expand nature experience
- Support biodiversity research
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Welcome to Biodiversa, the first free app that allows you to contribute to biodiversity monitoring and ecosystem conservation. Developed by 3Bee, the naturetech company that develops technologies for biodiversity conservation, Biodiversa is the app that turns your every outdoor activity into an exciting educational adventure, promoting biodiversity knowledge and conservation. HOW? You can easily identify the plants you encounter during your city walks and outdoor adventures. You'll simply snap a photo from the app to access a wealth of detailed information about that species, thanks to a photo-based recognition engine and image recognition machine learning system. By using Biodiversa, you will contribute to the creation of Europe's first dedicated flora and fauna archive by cataloging species, some of which are rare or endangered. In addition to recognition, Biodiversa offers an interactive, playful and educational experience through challenges that you can participate in alone or with your friends, raising your awareness of biodiversity loss through play. In addition, you can access insights and trivia not only about the identified species, but also about the fascinating world of plant and animal biodiversity, directly from the blog curated by 3Bee. BIODIVERSA - THE FEATURES - DATA: snap biodiversity around you and contribute to the largest scientific database of plants and (soon to be) pollinators. - KNOWLEDGE: Collect plants and (soon to be) pollinators and learn about biodiversity. - COMMUNITY: Challenge yourself and your friends, test yourself with Biodiversity Rarity Points. - ADVENTURE: travel and explore, expand your nature experience. - PROTECTION: Participate in the largest biodiversity research project sponsored by nature tech 3Bee. BIODIVERSA - WHO IT'S FOR - Are you a travel enthusiast? Biodiversa is the perfect companion to experiment with new activities during your travels and turn them into a unique experience. Learn more about the local biodiversity of your destinations and turn every trip into a mission of exploration and conservation. - Are you an HR or People & Culture Manager? Make the most out of Biodiversa, using it as a tool to organize innovative and sustainable team building activities. Through cataloging challenges and outdoor educational adventures, company employees will improve their teamwork, increase their environmental awareness and develop a greater appreciation for your company's culture of sustainability. Strengthen team bonds and promote corporate values related to sustainability and corporate social responsibility. - Are you a parent? Display Biodiversa to teach your children about the importance of biodiversity in a fun and engaging way during your walks in the park or outdoors. It stimulates children's curiosity about the natural world and encourages spontaneous environmentally friendly behavior. - Are you a teacher? Download Biodiversa and use it as an educational tool for field trips and outdoor science lessons. Support experiential learning and technological support, enrich the curriculum with real data, and actively participate in scientific research with your students. - Are you a tourism organization or a nature park? Plan an adventure with Biodiversa, using it as a tool to enrich the experience of visitors and tourists by offering memorable thematic discovery trails and encouraging participation in the largest biodiversity research project.
Screenshots
Verdict
The clearest difference is update cadence: Biodiversa at every 10 days against OpeNoise's every 7 months. OpeNoise's advantage is review sentiment (86% vs 67%). 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.
OpeNoise ships an update every 7 months, Biodiversa every 10 days. The most recent releases landed on September 21, 2026 and September 9, 2026 respectively.
| Parameter | OpeNoise | Biodiversa |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (4 ratings) — better | — |
| Positive reviews | 85.7% of reviews — better | 66.7% of reviews |
| Number of ratings | 4 — better | — |
| Update frequency | Every 7 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 18 MB | 145 MB |
| Age rating | 4+ | 4+ |
| Developer | Arpa Piemonte | 3Bee |
Customer experience
OpeNoise
Biodiversa
In-app purchases
OpeNoise
No in-app purchases
Biodiversa
No in-app purchases









