We're not going to pretend we're the best at everything — that's not how you actually pick the right app. Here's where each option in this category genuinely wins, and where it doesn't.
| Tonaura | myNoise | Endel | Brain.fm | |
|---|---|---|---|---|
| Solfeggio tones | All 9, plus a bonus deepener | Yes, single-slider only | None | None |
| Real entrainment (binaural/isochronic) | Yes, layered under the tones | No | Proprietary, undisclosed method | Yes, peer-reviewed research |
| Adaptive to your body | Heart-rate suggestions (Premium) | No | Yes — heart rate, weather, time | No |
| Ads | None, on either tier | Donation-supported | None | None |
| Works fully offline | Yes | No — browser only | Partial | Partial |
| Price | Free tier + £3.99/mo or £39.99 once | Free / donation | Subscription only | $99.99/yr |
Same honesty principle as everywhere else on this site: what's genuinely good about the alternative, stated plainly, not buried.
The long-standing free / donation web tool
Free, no account, refreshingly honest in its own way — no false claims, just sliders.
Browser-only, so playback stops when your phone locks or the tab loses focus. No real personalization, no entrainment layer, and the interface hasn't meaningfully changed in over a decade.
AI-adaptive soundscapes, Apple Watch App of the Year
Genuinely impressive real-time adaptation to your heart rate, the weather, and time of day. The best wearable integration in this category, full stop.
No solfeggio content at all — adaptation happens to generic ambient soundscapes, not to tones with any tradition or meaning behind them. Android support lags noticeably behind iOS.
Science-forward functional music
Actual peer-reviewed research behind its entrainment method, and a huge, never-repeating track library. If clinical rigor is what you want, this is the most credible option here.
$99.99/year, no solfeggio angle whatsoever, and the experience feels clinical rather than like a ritual — there's no warmth to it.
The many cheap / free solfeggio players on both stores
Cheap or free, chakra-framed, easy to find, plenty of downloads.
Static tones only, no real entrainment, dated interfaces, and at least one leading example has been flagged in its own store reviews for sharing user data with third parties.
If real entrainment research matters most to you, Brain.fm is the more rigorous choice. If wearable integration is what you're after, Endel does it best. If you specifically want solfeggio tones — done honestly, with a real entrainment layer underneath, and without your data going anywhere — that's the gap Tonaura was built to fill.
See Tonaura's pricing