Comparison

Hz Frequency by Lamda vs sol

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Hz Frequency by Lamda

This app offers precision Hz frequency soundscapes designed to promote inner harmony, clarity, and calm. It features binaural beats and various admired frequencies embedded in relaxing music, with interactive visual meditations to support stress relief and sleep.

Highlights
  • Precision Hz frequency programs
  • Binaural Beats
  • Interactive 3D scenes
  • Includes 432 Hz, 528 Hz, and solfeggio frequencies
  • Stress relief and relaxation support
  • Short interactive exercises
Features
Read full description

LAMDA is a precision Hz frequency sound portal to align body, mind & soul. Mesmerize to visual quantum meditation and shift to support clarity, calm & sleep. Sine wave Hz frequencies are embedded in relaxing music, calibrated with high FFT size for clean, accurate delivery. Find admired frequencies like 432 Hz, 528 Hz, 396 Hz, the solfeggio scale, binaural beats for low frequency programs to use with headphones, and more - uncompressed for precise exposure. Each program aligns with different internal states - stress relief, emotional grounding, energy cleansing, relaxation, and expanding awareness - guiding the mind toward clarity, harmony, and calm. Use LAMDA’s 1-minute, interactive exercises to reset during moments of tension or overstimulation. USE Hz FREQUENCY BY LAMDA FOR: - Stress, anxiety, or emotional tension - Spiritual wellbeing and mindfulness - Align body, mind & soul - Focus & mental organization - Meditation, lucid states, or manifestation support - Returning to balance and inner calm - Sleep, rest, and gentle frequency support __________ FEATURES: - Precision Hz frequency programs with pure tone or layered - Calibrated sine wave frequencies embedded in minimalist compositions - Binaural Beats for your mind & soul - Includes 528 Hz, 432 Hz, 40 Hz, 42 Hz, 111 Hz, and solfeggio frequencies - 3D interactive scenes for sensory experience - Headphones optional for binaural effects __________ DESIGNED TO SUPPORT: - Stress relief and nervous system regulation - Spiritual conscious connection - Mesmerize to visual quantum meditations - Relaxation, calm, and inner peace - Meditation, mindfulness, aura cleansing, and raising vibration - Rest, recovery, and preparation for sleep __________ LAMDA offers premium content via subscription. Access all sound profiles and interactive scenes with a free trial; cancel anytime. LAMDA is not intended to diagnose, treat, or prevent medical or psychological conditions. Terms of Use: https://www.lamdalife.com/terms-of-use

About

sol

This app uses AI to map your emotions to solfeggio frequencies and pair them with personalized sleep playlists. Track your emotional history and receive tailored frequency readings that evolve over time. Enjoy curated Spotify playlists designed to enhance your sleep experience.

Highlights
  • Emotional word check-ins
  • AI-powered frequency readings
  • Curated Spotify sleep playlists
  • Progressive reading history
  • Premium daily check-ins
  • Partner mode
Read full description

sol-dreams maps your emotions to solfeggio frequencies and pairs them with curated sleep playlists. Share three words that describe how you're feeling. Based on your words and emotional history, sol-dreams selects three frequencies tailored to your state — and your readings deepen over time features: - weekly check-ins with three emotional words - personalized frequency readings powered by AI - curated spotify sleep playlists for every frequency combination - progressive readings that build on your history - premium: daily check-ins, partner mode, monthly & annual summaries free tier includes weekly sunday check-ins. premium unlocks daily use. subscription terms: sol-dreams premium is available as a monthly ($3.99) or annual ($29.99) auto-renewable subscription with a 7-day free trial. payment is charged to your Apple ID account at confirmation of purchase. subscriptions auto-renew unless canceled at least 24 hours before the end of the current period. manage or cancel anytime in Settings > Apple ID > Subscriptions. Privacy Policy: https://sol-dreams.pages.dev/privacy Terms of Use: https://sol-dreams.pages.dev/terms

Screenshots

Hz Frequency by Lamda4 screens
sol4 screens

Verdict

The call

The clearest difference is update cadence: sol at every 2 days against Hz Frequency by Lamda's every 9 days. sol also leads on rating (5.0 vs 4.7). Hz Frequency by Lamda's advantage is ratings volume (21 vs 3) and device support (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Hz Frequency by Lamda sells 5 in-app purchases, starting at $4.99 per month and sol sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

sol holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Hz Frequency by Lamda has 21 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Hz Frequency by Lamda ships an update every 9 days, sol every 2 days. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

Scorecard5 real differences · 5 level
Hz Frequency by Lamda versus sol: the parameters behind the verdict, then further details
ParameterHz Frequency by Lamdasol
PriceFreeFree
Rating4.7 (21 ratings)5.0 (3 ratings) — better
Positive reviews75.0% of reviews—
Number of ratings21 — better3
Update frequencyEvery 9 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS14.0.0 — better18.0
Further details — not scored
Size168 MB14 MB
Age rating4+4+
DeveloperJehan RadwanZachary Hogan

Customer experience

Hz Frequency by Lamda

All ratings19 ratings
Positive94.7%
Neutral0.0%
Negative5.3%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

sol

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

5 purchases

Hz Frequency by Lamda

Subscriptions4
  • Monthly Premium3 Days trial$4.991 Month
  • Monthly Premium Standard3 Days trial$8.991 Month
  • Annual7 Days trial$19.991 Year
Show 1 more
  • Annual Premium7 Days trial$44.001 Year
One-time1
  • Lifetime$110.99
2 purchases

sol

Subscriptions2
  • Monthly Premium7 Days trial$3.991 Month
  • Yearly Premium7 Days trial$29.991 Year

Questions

Is Hz Frequency by Lamda free?
Hz Frequency by Lamda is free to download, with in-app purchases available.
Is sol free?
sol is free to download, with in-app purchases available.
Which has better reviews, Hz Frequency by Lamda or sol?
sol is rated higher. Hz Frequency by Lamda averages 4.7 out of 5 from 21 ratings, while sol averages 5.0 from 3 ratings.
Do Hz Frequency by Lamda or sol have ads?
Neither Hz Frequency by Lamda nor sol shows ads.
Which is updated more often, Hz Frequency by Lamda or sol?
Hz Frequency by Lamda ships an update every 9 days, and sol every 2 days. Most recently, Hz Frequency by Lamda was updated on November 8, 2026 and sol on November 5, 2026.

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