PhET Interactive Simulations

Overview

PhET Interactive Simulations is a collection of interactive science and mathematics activities built for learners from preschool through university. It is best for students and teachers who want to explore concepts through visual models and virtual experiments, rather than follow a complete course. Its combination of open-source simulations and offline access is compelling, but commercial use requires a license and some platform limits matter.

Key features

PhET’s design encourages scientific inquiry through interaction, visual mental models, multiple representations and real-world connections. That gives students ways to explore how ideas relate, while flexible classroom use lets teachers fit simulations into different learning contexts. Virtual experiments and guided lessons support active study; they do not, by themselves, amount to a full course.

PhET says each simulation is extensively tested and evaluated for educational effectiveness using student interviews and classroom observation. That educational focus makes the collection more suitable for teaching than simulations intended only as visual demonstrations. All simulations are open source, though commercial use still requires a license from the University of Colorado Boulder.

Most simulations are written in HTML5 and can run online or be downloaded; some older ones use Java or Flash. The Windows and macOS desktop app includes HTML5 and Java simulations and translations for offline use. The iOS and Android apps include HTML5 simulations and translations, and automatically download new HTML5 simulations. Mobile offline access is useful where connectivity is inconsistent, but the mobile apps’ stated coverage does not include legacy Java or Flash simulations.

PhET states that it collects no personally identifiable information when simulations run on its website, in its apps, embedded elsewhere or from downloads. It also says it uses no ads or ad-tracking technologies. Communications are served over HTTPS by default, and access to personal information is restricted to essential personnel under confidentiality obligations.

Pricing

PhET uses a freemium model, with the listed paid starting price at $0.99. Its Free simulations plan costs nothing and is free to all students and teachers, online or downloadable, with open-source access. That is the clear choice for classroom and personal educational use: it offers the core simulations without a subscription charge. Commercial users cannot rely on the free plan for commercial use and need a license from the University of Colorado Boulder.

The pricing model does not establish what a paid option at the starting price includes, so readers should not assume it changes the free plan’s access or removes platform limitations. No seat caps, quotas, trial terms or renewal terms apply to the free plan details provided.

Platforms

PhET supports web, Windows, macOS, iOS and Android, as well as select Chromebooks. Windows and macOS users can use the desktop app for offline HTML5 and Java simulations; iOS and Android apps offer offline HTML5 simulations. Android is not officially supported for browser-based HTML5 simulations, and Linux is not officially supported, so Android users should choose the app and Linux users should expect less dependable platform support.

Educators can create accounts using Clever federated login. Schools can deploy PhET for Schools apps through Google Admin Console, Apple School Manager or Apple Business Manager, making it a more practical fit for managed school devices than for institutions seeking broad deployment controls beyond those routes.

Who it's for

PhET is primarily designed for K–12 and university students, and its intended audience also includes preschool learners. It suits teachers who want interactive material for science and mathematics, and students who benefit from exploring rather than only reading or watching. It is less suitable for commercial training without a license, or for users who need official Linux or Android browser support.

Pros and cons

• Pro: Free access for students and teachers includes online or downloadable simulations, reducing cost barriers for educational use.
• Pro: Offline desktop and mobile apps make simulations usable without a continuous connection, with Java support in the desktop app.
• Pro: Open-source simulations and stated educational evaluation support classroom use and reuse.
• Pro: No ads or ad tracking, and no personally identifiable information collected during simulation use, are useful privacy assurances for schools and families.
• Con: Android browser-based HTML5 simulations and Linux are not officially supported, which narrows the dependable access options on those platforms.
• Con: The mobile apps cover HTML5 simulations, not the legacy Java or Flash titles, so mobile users do not get the same stated offline collection as desktop users.
• Con: Commercial use requires a separate University of Colorado Boulder license, so the free educational offer is not a basis for commercial deployment.

Alternatives

For a broader directory of options, see Science Learning Software or Chemistry Simulation Software. Choose Beyond Labz if you want instructor access that is always free and a Chemistry plan with a one-time payment of 31.95 USD. ExploreLearning Gizmos may suit schools seeking a limited free collection and customized school or district subscriptions. Choose PraxiLabs if a time-limited trial of three simulations, basic real-time guidance and English and Arabic interfaces fit your needs; its free plan lasts one month, and its monthly plan is $6.99 a month.

LabXchange is another free educational resource platform supported by grant funding. Concord Consortium STEM Learning Tools offers free resources for noncommercial use unless otherwise noted. Legends of Learning may fit teachers who need assignment-based classroom gameplay, with its free Basic Teacher plan capped at one teacher seat and three concurrent live and queued assignments. Inq-ITS is an option for schools considering student-count-based tiered plans and multi-year or district-wide arrangements. MEL Science is an alternative with a subscription billed every six months or monthly, both at $44.90 a month.

Verdict

Choose PhET if you are a student or educator looking for free, interactive science and mathematics simulations with useful offline options and an inquiry-led design. Its strongest case is educational exploration without a student or teacher access fee. Look elsewhere if you need dependable Linux or Android browser support, mobile access to legacy simulations, or commercial use without a separate license.