Probability vs Relax Before Sleep
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Probability assessment
- Decision-making improvement
- Problem-solving formulas
- Personalized notes
- Dice and coin toss simulations
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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.
Relax Before Sleep
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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
Verdict
The clearest difference is in-app purchases: Relax Before Sleep at none against Probability's 1. Probability's advantage is update cadence (every 10 days vs every 10 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
Both are free to download. Probability sells 1 one-off in-app purchase. Relax Before Sleep asks for nothing beyond the download.
Probability ships an update every 10 days, Relax Before Sleep every 10 months. The most recent releases landed on September 4, 2026 and September 6, 2026 respectively.
| Parameter | Probability | Relax Before Sleep |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 10 days — better | Every 10 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 166 MB | 55 MB |
| Age rating | 4+ | 4+ |
| Developer | Man Hung Sun | Hangzhou Plastic Engine Technology Co., Ltd |
In-app purchases
Probability
- Upgrade$0.99
Relax Before Sleep
No in-app purchases
Questions
Is Probability free?
Is Relax Before Sleep free?
Do Probability or Relax Before Sleep have ads?
Which is updated more often, Probability or Relax Before Sleep?
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