Comparison

Ooooo vs NeuralStack.io™

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

Head to head
About

Ooooo

This app generates binaural beat audio waves to help you achieve specific mind-states like sleep, meditation, or energy. It offers a simple, offline experience without ads or in-app purchases, and includes an Apple Watch app for convenience.

Highlights
  • Binaural beat audio generation
  • Supports sleep, meditation, relaxation, and energy states
  • Offline functionality
  • No ads or in-app purchases
  • Apple Watch app included
  • Optional white/brown noise masking
Features
Read full description

This is a straightforward app to help you achieve a chosen mind-state by generating what are known as "binaural beat audio waves" through your headphones, either from your iOS device or your Apple Watch. Depending on the frequency that you pick, based on the chart included in the app, it can potentially help with sleep, meditation, relaxation, or even for getting a short burst of energy. I have used similar apps for a while and have found them useful in helping me relax, or helping me float into a creative mood - Except most are overloaded with features that I never use and also cost money, have in-app purchases for "special programmes" and so on. So I decided to build one that does the same, works offline, has no ads or spying, works well, and is free. There's also an Apple Watch app included which you can use if you're mediating or relaxing away from your phone. As such, this app just generates the binaural frequency audio hum, and some optional white or brown noise to help mask outside sounds. You can then put it in the background and combine its audio with any other sound generator you like, or play music, radio, and so forth. All it does is to create the useful brainwave frequency, and then it gets out of your way.

About

NeuralStack.io™

Create personalized audio experiences for focus, sleep, and mindset enhancement. Combine brainwave entrainment, guided breathing, and ambient sounds to build custom 'Stacks'. Listen offline and alongside other apps.

Highlights
  • Customizable Stacks with multi-stage elements
  • Brainwave entrainment (0.5-100 Hz)
  • Guided breathing programs
  • Layered ambience and nature sounds
  • Offline listening
  • Integration with other apps
  • Stack playlists
Features
Read full description

Shape your mindset with customizable Brainwave Entrainment Stacks. Listen in Binaural, Monaural, Isochronic, or combined Binaural + Isochronic Tone Modes. Headphones are optional when listening to Monaural or Isochronic tones. Start with 100+ included Explore Stacks, or create your own by combining any of 300+ Multi-Stage Brainwave Entrainment programs with Guided Breathing and background audio elements into an integrated Stack. NeuralStack.io is designed for people who want more than fixed audio tracks. Instead of locking you into pre-made sessions and pre-mixed tones, NeuralStack.io provides advanced tone modulation and flexible tools to create custom soundscapes, so you can shape your ideal mindset for any situation. Includes 300+ advanced brainwave entrainment programs for focus, relaxation, stress relief, memory, insomnia relief, sleep, meditation, anxiety relief, and much more. Create custom multi-stage brainwave entrainment programs for your Stacks: * Add or remove stages, fine-tune stage durations. * Specify any beat frequency from 0.5–100 Hz. * Specify fractional frequencies with 2-decimal precision. * Choose carrier frequencies from 100–1000 Hz with automatic power equalization. * Listen in 4 Tone Modes: Binaural, Monaural, Isochronic, or phase-synchronized Binaural + Isochronic modes. * Supports Schumann Resonance frequencies (ex 7.83 Hz). Listen alongside other audio/video apps: * Set your preference to allow other apps at the app-level or the stack-level. Listen Offline: * Audio resources are synchronized to the device instead of being streamed, eliminating network traffic, saving battery life, and allowing you to listen offline. Guided Breathing: * Remix the included breathing programs to match your pace. * Create custom multi-stage breathing programs with adjustable tempo, text, and visuals. * Supports fractional breathing patterns, such as Coherent 5.5 second cycles. Advanced Global Settings * Use the app's Global Settings to modify tone characteristics, such as cycles-per-pulse and gain to sharpen or soften isochronic and monaural modulation. Stack Playlists * Organize your Stacks into playlists to support your daily routine. * Create sequences of Stacks that use different Tone Modes. Ambience and Nature * Layer dynamic ambience and nature sounds. * Remix programs, combining them to create multi-stage ambient and nature programs, and reuse them across different Stacks. Solfeggio and Schumann Frequencies * Includes single and multi-stage entrainment programs utilizing Solfeggio carrier frequencies and Schumann resonant beat frequencies to be remixed and customized. Color Noise * Layer a color noise element into your stack for sound masking and tinnitus relief. Pure Sine Waves * Create pure sine waves from 100 to 1000 Hz with power equalization and 2-decimal precision. * Remix and combine programs to create multi-stage Solfeggio progressions. Custom Audio Programs * Integrate personal audio files into your Stacks. * Note: This feature is only intended for personal audio files, such as those recorded with voice recording apps, and cannot access copy-protected audio or audio from streaming services. Subscription Required NeuralStack.io offers a free trial. Continued access to all features and content requires an auto-renewing subscription. Subscription options: $2.99/month or $24.99/year. These prices are for the United States, pricing in other countries may vary. Subscription will automatically renew unless turned off at least 24 hours before the current period ends. You can go to your App Store Account settings to manage your subscription and turn off auto-renew. Your App Store Account will be charged when the purchase is confirmed. If you subscribe before your free trial ends, the rest of your free trial period will be forfeited as soon as your purchase is confirmed. Terms of Use https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy https://neuralstack.io/#privacy

Screenshots

Ooooo1 screens
NeuralStack.io™4 screens

Verdict

The call

The clearest difference is in-app purchases: Ooooo at none against NeuralStack.io™'s 2. Ooooo also leads on ratings volume (121 vs 9). NeuralStack.io™'s advantage is update cadence (every 3 weeks vs every 5 months) and rating (5.0 vs 4.8). On price, review sentiment, ads and device support 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. NeuralStack.io™ sells 2 in-app purchases, starting at $2.99 per month. Ooooo asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

NeuralStack.io™ holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Ooooo has 121 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 96% of Ooooo's written reviews are positive against 100% of NeuralStack.io™'s.

UpkeepUpdate frequency

Ooooo ships an update every 5 months, NeuralStack.io™ every 3 weeks. The most recent releases landed on September 21, 2026 and October 6, 2026 respectively.

Scorecard6 real differences · 4 level
Ooooo versus NeuralStack.io™: the parameters behind the verdict, then further details
ParameterOooooNeuralStack.io™
PriceFreeFree
Rating4.8 (121 ratings)5.0 (9 ratings) — better
Positive reviews95.8% of reviews100.0% of reviews — better
Number of ratings121 — better9
Update frequencyEvery 5 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, Mac, Apple Watch — betteriPhone, iPad, iPod
Requires iOS26.015.0 — better
Further details — not scored
Size1 MB179 MB
Age rating4+4+
DeveloperPavlos TsochantarisBanzai Labs

Customer experience

Ooooo

All ratings121 ratings
Positive95.9%
Neutral1.7%
Negative2.5%
Written reviews72 reviews
Positive95.8%
Neutral1.4%
Negative2.8%

NeuralStack.io™

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Ooooo

Reported bugs

4 issues
  • App closes when phone goes to sleep or switches apps (needs background capability)
  • Frequency displayed does not match actual played frequency
  • Slider caps out at 500hz for some users
  • Stereo may not be working correctly for some users

Requested features

18 requests
  • Higher mhz frequencies
  • Numerical input for precision
  • Green Noise option
  • Program sequences of beats and transitions (auto-pilot)
  • Dial into specific frequencies to the thousandth decimal point
Show 13 more
  • Saved presets with labels
  • Ability to create automated presets with frequency changes over time
  • Full shortcut support
  • Add 40hz magic
  • Add pink noise
  • Add 0 frequency option to the watch
  • Add soft music or repetitive long tones, beach waves
  • Add the six main solfeggio frequencies (396 Hz, 417 Hz, 528 Hz, 639 Hz, 741 Hz, 852 Hz)
  • Add a sleep timer
  • Add a list of binaural frequency range names and definitions
  • Dual- or multi-frequency sliders
  • Add plus/minus buttons for fine-tuning frequencies
  • AirPlay 2 support

NeuralStack.io™

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Ooooo

No in-app purchases

2 purchases

NeuralStack.io™

Subscriptions2
  • NeuralStack.io Monthly Subscription14 Days trial$2.991 Month
  • NeuralStack.io Annual Subscription14 Days trial$24.991 Year

Questions

Is Ooooo free?
Ooooo is free to download, with no in-app purchases.
Is NeuralStack.io™ free?
NeuralStack.io™ is free to download, with in-app purchases available.
Which has better reviews, Ooooo or NeuralStack.io™?
NeuralStack.io™ is rated higher. Ooooo averages 4.8 out of 5 from 121 ratings, while NeuralStack.io™ averages 5.0 from 9 ratings.
Do Ooooo or NeuralStack.io™ have ads?
Neither Ooooo nor NeuralStack.io™ shows ads.
Which is updated more often, Ooooo or NeuralStack.io™?
Ooooo ships an update every 5 months, and NeuralStack.io™ every 3 weeks. Most recently, Ooooo was updated on September 21, 2026 and NeuralStack.io™ on October 6, 2026.

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