Comparison

Probability vs Guided Sleep Relaxation

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

Head to head
About

Probability

Enhance your decision-making skills by learning to assess probabilities with this app. It offers formulas for problem-solving, note-taking capabilities, and interactive tools like dice and coin tosses for practical learning.

Highlights
  • Probability assessment
  • Decision-making improvement
  • Problem-solving formulas
  • Personalized notes
  • Dice and coin toss simulations
Features
Read full description

Probability is the key to making decisions under uncertainty, and with our app,  you can improve your ability to assess probabilities and make better decisions in life.  Our app includes different formulas to help you solve problems and make decisions,  as well as the option to take references and write down your own notes about probability.  Plus, you can have fun with probability by tossing dice and coins.

About

Guided Sleep Relaxation

Features
Read full description

Relax Before Sleep — Guided Progressive Muscle Relaxation (PMR) to help you melt away bodily tension and drift naturally into restful sleep. 【WHY PROGRESSIVE MUSCLE RELAXATION?】 Lying in bed with a racing mind and a tense body? The first principle of sleep is zero muscle tension: when your body genuinely lets go, sleep naturally follows. No complex theory or meditation practice required. Simply close your eyes and follow gentle voice prompts from eyes to feet. Release your weight to gravity and reclaim your night. 【KEY FEATURES】 • 8-Step Body Scan: Preparation, eyes, tongue, jaw, face, neck/shoulders, arms, and legs/feet for step-by-step relaxation. • Multilingual Voiceovers: Interface supports 10 languages; voice narration available in 9 languages (male & female voices). • Custom Loop Count: Set 1 to 100 loops (default 5x) with automatic stop when finished. • Flexible Track Sequence: Select/deselect sections and tap any title to jump instantly. • 7 Speech Speeds: Fine-tune from 0.6x to 1.5x (default 0.9x slow guide) to match your breathing. • Soothing Background Music: Blend gentle music with voice guidance, or toggle off for voice only. • Bedtime Wooden Fish: Tap the digital temple block with tactile haptics to quiet your mind before sleep. • Serene Sleep Atmosphere: Cozy visual themes featuring night skies, moonlight, candlelight, and soft incense smoke. • Background Audio: Keeps playing smoothly when locked and stops automatically after chosen loops. • Instant Access: No sign-up or registration required—start your bedtime ritual right away. 【PERFECT FOR YOU IF...】 • You lie in bed feeling physically tense or restless. • You want a simple, effortless bedtime ritual. • You prefer clear voice guidance over white noise or complex courses. • You seek a tactile, physical approach to nightly relaxation. 【SUBSCRIPTION DETAILS】 • Free Version: Enjoy 1 full guided session per week. • Pro Subscription: Unlock unlimited sessions. Monthly and annual plans available; pricing shown in-app. • Renewal: Payment is charged to your App Store Account. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel anytime in Account Settings. Wishing you sweet dreams tonight. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Probability4 screens
Guided Sleep Relaxation4 screens

Verdict

The call

The clearest difference is in-app purchases: Guided Sleep Relaxation at none against Probability's 1. Probability's advantage is update cadence (every 10 days vs every 5 months) and iOS requirement (14.0 vs 26.0). On price, 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. Probability sells 1 one-off in-app purchase. Guided Sleep Relaxation asks for nothing beyond the download.

UpkeepUpdate frequency

Probability ships an update every 10 days, Guided Sleep Relaxation every 5 months. The most recent releases landed on October 23, 2026 and October 8, 2026 respectively.

Scorecard3 real differences · 7 level
Probability versus Guided Sleep Relaxation: the parameters behind the verdict, then further details
ParameterProbabilityGuided Sleep Relaxation
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 10 days — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPad
Requires iOS14.0 — better26.0
Further details — not scored
Size166 MB58 MB
Age rating4+4+
DeveloperMan Hung SunHangzhou Kasoo Labs Technology Co., Ltd

In-app purchases

1 purchases

Probability

One-time1
  • Upgrade$0.99
None

Guided Sleep Relaxation

No in-app purchases

Questions

Is Probability free?
Probability is free to download, with in-app purchases available.
Is Guided Sleep Relaxation free?
Guided Sleep Relaxation is free to download, with no in-app purchases.
Do Probability or Guided Sleep Relaxation have ads?
Neither Probability nor Guided Sleep Relaxation shows ads.
Which is updated more often, Probability or Guided Sleep Relaxation?
Probability ships an update every 10 days, and Guided Sleep Relaxation every 5 months. Most recently, Probability was updated on October 23, 2026 and Guided Sleep Relaxation on October 8, 2026.

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