Frequently Asked Question

• How does Mendi work?

  Mendi uses fNIRS (functional near-infrared spectroscopy) to measure blood flow and oxygenation in your prefrontal cortex in real time. That signal feeds into a 10-minute daily game where you train your brain to activate and sustain focus. The more you train, the stronger and more consistent that activation becomes.
  
  

• Who can use Mendi?

  Mendi is suitable for all age groups, though we recommend it for ages 5 and up. It is particularly helpful for those seeking to improve focus, emotion regulation, and working memory as part of a healthy brain training routine.Please note that Mendi is not a certified medical device and is not intended to diagnose or treat medical or mental health conditions. If you have, or suspect you may have, a medical condition, please consult your healthcare provider before using Mendi.

• How do I get started with Mendi?

  Get started in less than 30 sec:

  • Put on your Mendi headband and open the Mendi brain training app. Make sure it fits snugly on your forehead to measure brain activity accurately.
  • Find a dim spot to avoid bright lights, this helps ensure a clearer signal.
  • Select your training duration and settle in. Relax and focus on the ball, aim to make it rise. Each time a star appears, think of it as instant feedback that you're “doing it right.”

  Bonus Tip: Try a quick session before work, studying, or sports. It’s a great way to boost focus and mental sharpness!
  
  

• Is it safe? Is it non-invasive?

  Yes. Mendi sits on your forehead and uses near-infrared light to read brain activity. No electrical stimulation, no needles, no discomfort. The same fNIRS technology has been used safely in neuroscience research for over 40 years.
  
  

• When will I see results?

  Most users begin noticing changes within 2 to 4 weeks of consistent training. Measurable improvements in focus, stress resilience, and mental clarity are typically reported after 8 weeks. Results vary by individual and training frequency.
  
  

• How often should I train?

  New users should gradually adjust their neurofeedback training to suit their individual needs. During the first week, we recommend three 5-minute sessions to become familiar with the app and headband.
  Over time, you can increase session length. Aim for 4–5 sessions per week, gradually extending them to 10 or 15 minutes as you progress, until you feel comfortable with daily sessions. Be mindful of mental fatigue, and prioritize quality over quantity by scheduling sessions under calm conditions for the most accurate feedback.
  
  

• Can multiple people use the same device?

  Yes. The Mendi app supports multiple user profiles, so the whole family can train on one device. Each person tracks their own progress separately.
  
  

• Do I need a subscription?

  No. The Mendi app is free with no ongoing subscription fees. You pay once for the device and get full access to all training features.
  
  

• What is the return policy?

  Mendi comes with a 60-day risk-free trial. If you are not satisfied within 60 days of purchase, you can return it for a full refund.
  
  

• What devices are supported?

  Mendi works with iOS and Android smartphones via Bluetooth.

• How is this different from meditation apps?

  Meditation apps guide you through a practice but cannot measure what your brain is actually doing. Mendi reads your prefrontal cortex activity in real time and gives you objective feedback on your performance. You are not just following instructions. You are training a measurable skill.
  
  

• Is there scientific evidence behind Mendi?

  Yes. Mendi is built on 40+ years of peer-reviewed fNIRS neurofeedback research. Independent researchers at Stockholm University validated Mendi's sensor accuracy against BioPac fNIR100 lab equipment. Published studies on fNIRS neurofeedback training show measurable improvements in sustained focus, working memory, and stress resilience.