An Endel alternative that runs in your browser

Endel and ONDA both generate ambient soundscapes in real time instead of playing fixed tracks. Endel is a subscription app that personalises sound using signals such as time of day, weather and heart rate. ONDA runs in the browser with nothing to install, composes on your device, works offline, carries optional frequency programs inside the music and is free during its preview.

Try ONDA free →Free for 10 minutes · no sign-up · nothing to install

What they have in common

Both are generative: the music is composed as it plays, so it does not loop. Both organise listening into moments such as focus, relaxation and sleep, and both are designed to stay in the background rather than be listened to like an album.

Where ONDA is different

No install: open onda-flow.app and press play. Add it to your home screen if you like.
Seven spaces: Focus, Unwind, Sleep, Stillness, Energy, Balance and Recover, with three authored soundscapes each.
Hands-on control: drag one point to make the music warmer, brighter, calmer or livelier, and add nature beds.
Frequency programs: optional rhythms such as the 7.83 Hz Schumann resonance, moving inside the music, with a one-tap switch back to music only.
Private by design: no ads, no trackers, and you can start without an account.

Where Endel may suit you better

If you want the soundscape to adapt automatically to your heart rate, location or the weather, or you want a long-established app with artist collaborations, Endel is built around that. ONDA asks you to choose the moment yourself.

ONDA and Endel side by side

	ONDA	Endel
How music is made	Composed live on your device	Generated in real time
Loops	Never	Does not loop
Personalisation	Manual: Adjust, nature beds, programs	Automatic: time, weather, heart rate, among others
Install	None needed, runs in the browser (installable)	App for phone and desktop
Offline	Yes, after first visit	See Endel
Price	Free during preview (10 min without sign-up)	Subscription, see Endel

Questions

Is ONDA like Endel?

Both generate ambient soundscapes live instead of playing recordings. ONDA runs in your browser, lets you shape the sound by hand and is free during its preview.

Is ONDA free?

Yes, during the preview. You can listen for 10 minutes straight away with no sign-up, then create a free account with just an email address to keep listening.

Does ONDA work offline?

Yes. ONDA composes the music on your device instead of streaming it, so after the first visit it keeps working without a connection. You can add it to your home screen and it plays with the screen locked.

Note on sources

Details about other services are summarised from their own public descriptions as of October 2026 and may change; check each service for current features and pricing. ONDA is not affiliated with any of them.

ComparisonsHow ONDA compares with Endel, Brain.fm, Calm and Noisli for focus, relaxation and sleep sound: how the music is made, claims, price and privacy..Generative musicGenerative music is composed by a system as it plays, so it never repeats.ONDA vs Brain.fmComparing Brain.fm and ONDA for focus music: how the music is made, claims, price and privacy.Focus musicCalm, wordless focus music composed live on your device.

Updated 20 October 2026