Free on iOS and Android

The free mental health app built on light and sound

6th Mind guides your brain toward rest, calm or focus with audio-visual entrainment, using the same approach we use with clients in our practice office in Sofia.

Or play a session in your browser, no signup

No ads
Works offline
36 sessions, 6 or 11 minutes

The 6th Mind app: a session player and the session list

Start with what you need

Four goals, one brainwave band each

Browse all 36 sessions

Mental clarity

Gamma 40 Hz · 6 sessions

Listen now

More than an app

Listen, build your own, or go deeper

Session library

Play every session in your browser

All 36 sessions from the app, free to hear right now. No account, no download.

Open the library →

Goal Better sleep · Delta

Length 25 minutes

Sound Your music, or brown noise

Session creator

Build a session around your own music

Pick a goal, a length from 6 to 60 minutes and a sound. We render it, and it shows up in your app, with synchronised light.

Create a session →

Mental 6-packs

Themed sets of six sessions

Evening wind-downs, focus blocks and more. Some packs are free; paid ones are yours forever, or all included with Premium.

See the packs →

How it works

Your brain tends to follow a steady rhythm

Each session pairs gentle pulses of light with matching tones. Slow rhythms invite rest and sleep; faster ones support calm, mood and focus. That's audio-visual entrainment.

1

Pick what you need

Sleep, stress, mood or focus. Each goal maps to a brainwave band: delta, theta, alpha or 40 Hz gamma.
2

Close your eyes and press play

Your phone's light pulses at the target frequency while tones play in your headphones. 6 or 11 minutes.
3

Go deeper with headset mode

Slot your phone into a simple headset holder for full-field light, the closest thing to the lamps in our office.

What is AVE? 40 Hz gamma sessions

Not suitable for people with epilepsy or a history of seizures.

A woman relaxing in an armchair during a headset-mode session

Built in a real practice

Every session started in our practice office

Before 6th Mind was an app, it was a practice office in Sofia. A psychotherapist runs AVE sessions there, with EEG recorded before and after each one. What we learn there shapes the sessions on your phone.

How we measure About our practice office in Sofia, Bulgaria →

1000+

AVE sessions in our practice office, with EEG before and after each

170

people have taken part in programmes there

80%+

of programmes with 10+ sessions improved on our EEG baseline index

Not every programme reaches 10 sessions, so the 80%+ describes completers, not everyone who starts. This is data from our own practice, not a randomised trial.

The sessions were very exciting. After attending them, I made some very important life decisions and felt calm and confident. That feeling continues to this day.

Rumyana 10 sessions with 6th

The sessions had an extremely strong effect on the quality of my sleep, improved how I handled difficult situations in daily life, and lifted my mood. Overall, I’m extremely satisfied and was sad when they ended.

Maria 15 sessions with 6th

The result is stunning, but it requires consistency in attending the sessions.

Ivan 15 sessions with 6th

Clients of our practice office. Individual experiences vary.

Mental wellbeing · Free

In our office we measure with EEG. In the app, your voice.

Talk for about a minute and 6th Mind gives you a Wellbeing score from 0 to 100. Together with the questionnaire that builds your 15-day programme and the one after day 15, it tells the app what works for you.

1

Talk for a minute

Before your first session of the day, talk about an everyday topic the app suggests.
2

Get your Wellbeing score

From 0 to 100, higher is better. After 7 daily checks you see your trend.
3

Your routine follows

Once you have enough daily checks, 6th Mind builds your routine around the sessions and frequency profiles that work best for you.

How the Wellbeing score works

The model runs on our own server. Your recording isn't turned into text or shared, and it's deleted as soon as it's analysed. Only the score is kept.

6th Mind My activity: Wellbeing score 59, improving by 2.6 points a week

Optional extras

The app is free. Packs and Premium go further.

Mental 6-packs add themed sessions to your app. Paid packs are only sold here on the website, and they're what keeps the app itself free for everyone.

Wild sanctuary Premium

6th Mind Premium

$0 for 7 days

then $39.99/year, or $5.99/month

Every paid pack, including future ones
Unlimited saved custom sessions
30 creator renders a month
Share your sessions by email

Start your free week

No charge today. Cancel anytime, online or in the app.

From the blog

Research, explained plainly

All articles

3 November 2026

What actually reduces burnout, according to three 2026 meta-analyses

20 October 2026

Your light and sound session knows nothing about you

13 October 2026

Every study we cite about light and sound, and what each one does not show

Questions, answered

Is 6th Mind really free?

Yes. The app is free to download and use, with no ads, and all 36 default sessions are included. Optional Mental 6-packs and a Premium subscription are sold on this website; you never need them to use the app.

How does 6th Mind know what works for me?

Three things. A short questionnaire builds your 15-day programme. Each day, about a minute of your voice gives you a Wellbeing score, and once you have enough daily checks, 6th Mind builds your routine around the sessions and frequency profiles that work best for you. After day 15, a second questionnaire shows what changed and shapes your next programme.

What is audio-visual entrainment (AVE)?

AVE uses steady pulses of light and sound to encourage the brain toward a matching rhythm: slow for rest and sleep, fast for focus. It is the method we use in our practice office in Sofia. Read how AVE works.

Do I need any special equipment?

Headphones are enough to start. The light comes from your phone. For a fuller effect, headset mode works with a simple phone headset holder that costs around $10–$30.

Can I try a session without installing anything?

Yes. The Session library plays the sound of every session right in your browser, with no signup. The light part needs the app.

Is it safe?

AVE is non-invasive, and most people simply feel relaxed or a little sleepy afterwards. It is not suitable for people with epilepsy or a history of seizures. 6th Mind complements professional care; it doesn't replace it.

Where is your practice office?

In Sofia, Bulgaria, next to the Zdrave 33 practice. In-person sessions are booked through Superdoc. See the practice office.

Try one session tonight

Eleven minutes, eyes closed, headphones on. The app is free, with no ads.

Or listen in your browser first →

The free mental health app built on light and sound

Four goals, one brainwave band each

Better sleep

Stress relief

Mood boost