The price is the whole price.
Vartra builds weather as it plays, adds a quiet tone, and guides your breathing.
Every preset shows its label, its caveat and its sources.
The tone
Two tones become one steady beat.
Evening plays 146.83 Hz in the left ear and 156.83 Hz in the right.
Heard together, their 10 Hz difference comes through as a beat.
Binaural tones need headphones.
- Left ear
- 146.83 Hz
- Right ear
- 156.83 Hz
- Beat
- 10 Hz
Beat accurate to a thousandth of a hertz — verified by automated tests on every build.
An illustration of how the beat forms, not a live oscilloscope.
The labels
Every preset tells you what research actually found.
Including when it found little.
Each preset carries one of three labels.
In the app, tap a label to open its sheet: the claim, the finding, the caveat and the sources.
Controlled studies of the technique exist. The sheet states the effect size where one is known.
Evening · Breath
The findings do not cover this use, or they cut the other way. The sheet says which.
At the desk · For the night · Sitting still · Morning · Ten minutes
The practice or principle has a real origin, and the sheet names it.
Speech masking
An example
At the desk
At the desk plays a steady 14 Hz tone.
Its sheet reports a study of 920 people under a 15 Hz beat.
Their cognitive performance came out 4–6% lower, not higher.
The preset promises nothing, and the caveat says why.
The scene
A storm that builds, peaks and fades.
The Hearth scene has six layers: rain, wind, fire, thunder, birds and insects.
They play separately, never as one fixed track.
A storm cycle, 40 minutes long by default, raises and lowers the rain and the wind.
Wind rises first, and rain peaks later.
Every cycle keeps that order, and its timing shifts a little each time.
Birds and insects drop lower while it rains.
The sounds in this version are synthesised placeholders. Recorded sounds are planned to replace them.
One storm cycle · rain and wind
40 min by default
The breath guide
A circle and a soft sound pace each breath.
The circle grows and shrinks, and its brightness stays the same.
The guide runs on the audio clock, so the circle stays in step with the sound.
Turn the sound off, and the circle keeps pacing on its own.
Every value is in seconds.
Coherent is the default and has the best data of the four.
In the app, the Breath preset carries this label.
Its sheet says paced breathing is one of the four techniques the plans place at researched.
The breath guide stays free, in the browser and in the app.
Planned
A screen designed for eyes closed.
Night’s palette is amber only, with no red and no pure white.
In the design, every control is at least 88 px across.
The lower half of the screen is designed as three large touch areas.
Left alone, the screen is designed to fade to one amber dot.
Night is planned and is not in this version.
Price
Try everything for 7 days, then pay once or keep the free tier.
These prices are for the app on Google Play, which is not out yet.
Prices include VAT. The store shows the final price for your country.
In the browser, Vartra stays at the free tier.
The app has no subscription and shows no ads.
Trial
Every feature works for 7 days from the first launch.
€0
for 7 days
Launch price
Paid once. The launch price runs from release day for a fixed period. Its end date is announced on release day and never extended.
€12.99
once
Regular price
Paid once. It applies after the launch price ends.
€19.99
once
Free tier
If you don't buy, Vartra keeps working: the breath guide and one preset stay free forever. The free preset is Evening.
€0
always
Both prices buy the same full app.
Roadmap
What exists now, and what is planned.
The plan has no public dates.
Each step ships when its written exit checks pass.
Now
Calm in the browser
It plays Evening, the free preset, with the Hearth scene, a quiet tone and the breath guide.
Planned before the Google Play release
Layer panel and saved mixes
You set each layer of the scene and keep the mixes you like.
Waves and Night
Two more modes show the same sound in their own layouts.
Studio and export
A detailed mode builds sessions and exports them as audio files.
Android app
Vartra runs as an installed app on Android phones.
Real recordings
Recorded sounds replace the synthesised placeholders.
Trial and purchase
You get 7 days with every feature, then pay once or keep the free tier.
Planned after
iPhone
It follows once it can be tested on a real iPhone.
Desktop
The full app runs on a computer, for €24.99 once.
World
An expansion adds new places and downloadable sound sets. Nothing already in the app moves behind it. It costs €9.99, paid once.
Hear it in your browser.
The demo runs the real engine, with the breath guide and Evening.
This site
vartra.app runs no advertising pixels and sets no cookies. Every file on this site loads from the site itself.
The demo
Nothing you set or make in Vartra leaves this device. It loads only its own files, from its own address, and contacts no other server. Its build fails if the code names a server outside a short, reviewed list.
Analytics
The playable demo at /try carries no counting of any kind.