BottleChallenge vs Waveful (Remove Ads)

Every time you refill your bottle instead of buying a new plastic one, something small but real happens. Less plastic to carry, less money spent. And with BottleChallenge, you actually get rewarded for it. Find free water near you The map shows refill points around you: cafes, restaurants, museums, gyms, and other venues that offer free tap water to anyone who asks. Updated by the community, so it keeps growing wherever you go. Earn real rewards Every refill earns you EcoDrops. Collect enough and redeem them for cinema tickets, theater and museum entries, concert passes, and special offers from local venues. The more you refill, the more you unlock. Track your refills BottleChallenge counts your refills and shows how many half-litre bottles of water you've filled. Share it or just enjoy watching the number grow. Scan and collect At participating venues, tap the NFC tag to instantly log your refill and earn EcoDrops on the spot. No manual input needed. Build the network Know a cafe or gym that offers free water but isn't on the map yet? Add it, upload a photo, and make it easier for everyone else to find. The network grows with every contribution. BottleChallenge is a free nonprofit app by BrainGreen Foundation. No ads, no subscriptions, just a community of people who believe that small habits, done consistently, actually change things. Download BottleChallenge. Refill. Earn. Repeat.

* Sound-based Wellness App Inspired by Frequency Research This wellness app provides frequency (Hz)-based sounds inspired by scientific papers and research studies. Explore sound categories such as Motion Comfort, Relaxation, Focus Support, Meditation, Ambient Noise, and Guided Breathing to create a more comfortable listening experience in everyday life. * Available Sounds 1. 100Hz Motion Comfort / Gentle Low-Frequency Support - Inspired by research published in Environmental Health and Preventive Medicine by researchers from Nagoya University, Japan (2025) 2. 432Hz Relax Mode / Relaxation & Sleep Support - Inspired by research published in EXPLORE by researchers from the University of Florence, Spain (2019) - Inspired by research published in Journal of Applied Oral Science by researchers from Valdivia, Chile (2020) 3. 528Hz Relaxation Tone / Calm & Relaxation Support - Inspired by research published in Health by researchers from Juntendo University, Japan (2018) 4. Binaural Beats Focus Support / Concentration Aid - Inspired by research published in Psychological Research by researchers from UNED, Spain (2019) - Inspired by research published in PLOS ONE by researchers from the University of Duisburg-Essen, Germany (2023) 5. 40Hz Gamma-Inspired Sound / Cognitive Focus Support - Inspired by research published in Journal of Neuroscience by researchers from the Pamplona Medical School, Spain (2002) 6. Ambient Noise Layer / White, Pink & Brown Noise - Inspired by research published in Journal of Clinical Sleep Medicine by researchers from Weill Cornell Medical College, USA (2022) - Inspired by research published in Frontiers in Psychology by researchers from Hamburg University Hospital, Germany (2015) 7. Guided Breathing / 4-7-8 & Box Breathing - Inspired by research published in Neuroscience & Biobehavioral Reviews by researchers from the University of Caen Normandy, France (2022) 8. 963Hz Meditation Tone / Deep Meditation - Direct clinical evidence regarding the specific effects of 963Hz remains limited. - This feature is designed as a high-frequency meditation sound intended to support deep meditation and immersive listening experiences rather than medical treatment. 9. 639Hz Harmonic Energy / Harmonious Atmosphere - Direct clinical evidence regarding the specific effects of 639Hz is currently limited. - This feature is intended to provide a soft harmonic tone for creating a calm and harmonious atmosphere. 10. 72Hz Deep Grounding / Low Frequency Grounding - Direct clinical evidence regarding the specific grounding effects of 72Hz has not been established. - This feature is designed as a low-frequency sound intended to create a calm and stable listening environment. 11. 1122Hz Clarity Tone / Clear High-Frequency Tone - Direct clinical evidence regarding the specific effects of 1122Hz remains limited. - This feature is intended to provide a clear and crisp high-frequency listening experience that may support focus and mental clarity. * Recommended Listening Time - Motion Comfort: 1 min - Sleep / Relaxation: 20–45 min, default 30 min - Stress Relief: 10–30 min, default 15 min - Focus: 15–45 min, default 25 min - Meditation: 10–30 min, default 15 min - Energy / Awakening: 5–15 min, default 10 min - Cognitive Focus Support: 10–20 min, default 15 min - Deep Grounding: 5–20 min, default 10 min - Spiritual / Intuition Sounds: 5–20 min, default 10 min *How to Use 1. Wear earphones or headphones for a more immersive experience. 2. Select your preferred category and press play. 3. Customize the playback timer as needed. * Key Features - Custom Hz settings - Background playback - Multiple timer options This app is a wellness tool inspired by research. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. Individual experiences may vary. Consult a qualified healthcare professional for health-related concerns.