Probability Distribution vs LetterChallenge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Probability Distribution
This app allows users to calculate probabilities and visualize various continuous and discrete probability distributions. It supports a wide range of common distributions and plans to add more in the future.
- Calculate probabilities
- Visualize distributions
- Normal (Gaussian) distribution
- Binomial distribution
- Poisson distribution
- Exponential distribution
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Calculate probabilities and visualize probability distributions. Supported continuous probability distributions: - Normal (Gaussian) - t (Student's t) - Chi-Squared - F - Exponential - Gamma - Beta - Log-normal Supported discrete probability distributions: - Binomial - Poisson - Pascal - Geometric - Hypergeometric and more are coming.
LetterChallenge
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Step into the world's most elegant word search experience. LetterChallenge redefines puzzle gaming with stunning design, intuitive gameplay, and endless brain-teasing fun. Discover hidden words in beautifully crafted grids and experience word search like never before. • 30+ Beautiful Themes • Multiple Difficulty Levels • Stunning Apple-Inspired Design • Smooth & Satisfying Gameplay Ready for the ultimate word search challenge? LetterChallenge combines classic puzzle mechanics with modern gaming excellence.
Screenshots
Verdict
Probability Distribution and LetterChallenge are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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 Distribution sells 1 one-off in-app purchase and LetterChallenge sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Probability Distribution ships an update every 2 weeks, LetterChallenge fortnightly. The most recent releases landed on October 12, 2026 and October 16, 2026 respectively.
| Parameter | Probability Distribution | LetterChallenge |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (15 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 15 — better | — |
| Update frequency | Every 2 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 16.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 7 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Madiyar Aitbayev | Hardeep Kumar Sah |
In-app purchases
Probability Distribution
- Unlock All Distributions$2.99
LetterChallenge
- All Access$1.99
Questions
Is Probability Distribution free?
Is LetterChallenge free?
Do Probability Distribution or LetterChallenge have ads?
Which is updated more often, Probability Distribution or LetterChallenge?
Other comparisons
