Probability by Surprise
Probability by Surprise: A free web collection for exploring probability puzzles through interactive demonstrations. Ranked #11 of 40 in Statistics Learning Software by our editors (7.9/10); pricing: Free plan; best for exploring probability puzzles and demonstrations.
At a glance
- Editor score7.9 / 10
- PricingFree plan
- Best forExploring probability puzzles and demonstrations
- Free planYes
- Paid fromNone
- Guided lessonsYes
- Facts checked28 Sep 2026
Where it wins
- Applets cover birthday, matching, collector, and Banach’s matchbox problems
- Visualizes probability trees and two-dimensional density with conditional probability
- Includes class notes for an introductory probability course
Where it doesn't
- Focuses on probability rather than a broader statistics curriculum
- No documented teacher assignment or student-management tools
- Web-only access limits use to the supported platform
Our verdict on Probability by Surprise
Probability by Surprise is a web-based collection of interactive applets for exploring probability through puzzles and visual demonstrations. It suits learners who want to investigate probability concepts independently, especially solo learners and small groups, and includes class notes for an introductory probability course. Its focus is exploration rather than structured classroom administration, so it is less suited to instructors seeking assignment or student-management features within the same product.
The collection ranges from familiar problems such as birthdays and matching to the collector problem and Banach’s matchbox problem. Other activities include Say Red, IID sequences, Polya’s urn, random scatter, and traffic jams. Probability tree and two-dimensional density visualizations extend the collection beyond individual puzzles, with conditional probability represented in the density activity. This variety gives learners multiple ways to examine probability, but the scope remains centered on probability rather than a broad statistics curriculum. Choose it for focused experimentation and demonstrations, not as a complete statistics learning environment.
The resource is available on the web and is presented as free to access. That makes it a straightforward option for exploring the listed applets without a paid tier to compare. Its published materials include class notes, but the product is not documented as providing teacher assignments or student-management tools. Learners looking for probability puzzles, simulations, and visual explanations are the clearest fit; those who need classroom workflows or wider coverage of statistics should consider a broader learning platform instead.
Probability by Surprise pricing
Probability by Surprise fact sheet
| Free plan | Yes |
|---|---|
| Paid from | None |
| Guided lessons | Yes |
| Statistics simulations | Yes |
| Probability experiments | Yes |
| Classroom tools | No |
| Supported platforms | web |
| Deployment | Cloud |
| Platforms | Web |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | chance.dartmouth.edu |
| Facts checked | 28 Sep 2026 |
Alternatives to Probability by Surprise
- Integrated Statistics Learning Environment (ISLE)An open-source teaching environment that pairs statistics instruction with collaborative analysis.9.3
- SOCR (Statistics Online Computational Resource)A broad, free statistics resource combining learning materials, simulations, and analysis tools.9.2
- Conceptual Learning with Interactive AppletsA free, browser-based collection for visualizing core statistics concepts in class.9.1
See all Probability by Surprise alternatives →
Used Probability by Surprise? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Probability by Surprise for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
Probability by Surprise is listed in our Statistics Learning Software directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/probability-by-surprise/"><img src="https://www.itechguides.com/best/badge/probability-by-surprise.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. How we rank.
Last updated · How we research and update