Probability vs Thermonator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Probability
Calculate probabilities, find percentiles, and visualize probability density or mass functions for a wide range of continuous and discrete statistical distributions. Explore common distributions like normal, binomial, Poisson, and many more.
- Compute probabilities
- Determine percentiles
- Plot probability density function
- Plot probability mass function
- Supports 10+ continuous distributions
- Supports 5+ discrete distributions
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Compute probabilities, determine percentiles, and plot the probability density function for the normal (Gaussian), t, chi-square, F, exponential, gamma, beta, log-normal, Pareto, and Weibull distributions. Compute probabilities, approximate percentiles, and plot the probability mass function for the binomial, geometric, hypergeometric, Poisson, and negative binomial distributions.
Thermonator
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Thermonator: The Matter Maker is an engaging and educational app designed to help users see their own theories about how states of matter change from solids to liquids to gases. By manipulating and animating dots that move and collide into one another, users explore different properties of particles while modeling different states of matter. Go beyond static drawings with the Thermonator. Control the speed, attraction, bounce, and gravity of yellow and purple dots. Predict what will happen when you remove the divider that separates different dots and watch the fast particles (gas) bump into the slow particles (solid). Change kinetic parameters to understand that temperature is not an amount of stuff, but rather is best treated as the relative speed of particles. The Thermonator also helps users construct the causal agents for phase changes of matter, such as the change of particle speeds after colliding with other particles. The Thermonator was designed in collaboration with the award-winning FableVision multimedia production studio. This material is based upon work supported by the National Science Foundation under grant DRL- 1621299. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. A lesson plan for this app is available at http://short.concord.org/8a
Screenshots
Verdict
The clearest difference is price: Thermonator at Free against Probability's $1.99. Thermonator also leads on iOS requirement (10.0 vs 14.0). Probability's advantage is chart position (#54 vs unranked). On update cadence, ads, in-app purchases 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
Thermonator is free to download; Probability costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Probability ships an update every 3 months, Thermonator every 2 months. The most recent releases landed on September 23, 2026 and September 15, 2026 respectively.
| Parameter | Probability | Thermonator |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.9 (193 ratings) — better | — |
| Positive reviews | 97.2% of reviews | — |
| Number of ratings | 193 — better | — |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Best chart rank | #54 — better | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 118 MB |
| Age rating | 17+ | 4+ |
| Developer | Matthew Bognar | The Concord Consortium |
Bugs and requests
Probability
Requested features
7 requests- Exam mode similar to Geogebra
- Poisson distribution
- Allow setting plot boundaries (e.g., for Beta distribution)
- Make formulae available in offline mode
- Clearly introduce parameters
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- Add options after graph rendering (area above, between, outside values)
- Consistent terms for df across distributions
Thermonator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Probability
No in-app purchases
Thermonator
No in-app purchases
Questions
Is Probability free?
Is Thermonator free?
Do Probability or Thermonator have ads?
Which is updated more often, Probability or Thermonator?
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