Interactive Simulations& Professional Engineering Tools
Free simulators, calculators, and analysis tools for science, engineering, and finance. From beam deflection to thermodynamic cycles, structural analysis to portfolio optimization — explore, calculate, and verify.
Why Choose Simulations4All?
Our platform combines cutting-edge technology with educational best practices.
WebGPU Powered
High-performance rendering for complex interactive simulations.
AI Tutor
Your own AI assistant running locally in your browser. No subscriptions, no fees.
Interactive Learning
Adjust parameters in real-time and visualize complex concepts.
Gamification
Earn points, badges, and track your learning progress.
Trending Simulations
Trending today
Reynolds Number Calculator
Free Reynolds number calculator for pipe and channel flow. Instantly classify laminar (Re < 2300) vs turbulent (Re > 4000) flow. Includes friction factor, pressure drop, fluid property lookup, and pipe sizing wizard. Try it free!
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Photosynthesis Lab Simulator
Free photosynthesis rate simulator. Adjust light intensity, CO2 concentration, and temperature to measure oxygen production rate. Identify limiting factors and optimal growing conditions. Perfect for biology and botany students. Try it free!
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pH Titration Curve Simulator
Free pH titration curve simulator. Plot titration curves, find equivalence points, and calculate buffer regions. Strong/weak acid-base combinations with animated virtual lab.
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Nuclear Reactor Power Plant Simulator
Interactive nuclear reactor power plant simulator covering 8 reactor types: PWR, BWR, CANDU, SMR, micro reactors, thorium MSR, sodium-cooled fast breeders, and Gen IV HTGR. An advanced-engineering-tool for nuclear power analysis with real-time neutronics, thermal-hydraulics, decay heat modeling, LCOE economics, and animated reactor schematics.
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Refrigeration Cycle Calculator
Free refrigeration cycle simulator. Calculate COP, cooling capacity, and compressor work for R-134a, R-410A, and other refrigerants. Visualize P-h and T-s diagrams with state points. Perfect for HVAC and thermodynamics students. Try it free!
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Seasons Simulator - Earth Axial Tilt & Day Length
Free seasons simulator showing how Earth's 23.5° axial tilt creates seasons. Visualize solstices, equinoxes, day length changes, and sunlight angles throughout the year.
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Recently published simulations fresh from our lab
Dam Engineering & Hydraulics Simulator
Professional dam engineering calculator for gravity, arch, buttress, and earth-fill dams. Analyze stability against sliding and overturning, design spillways (ogee and broad-crested weir), calculate uplift pressures with drainage galleries, and optimize dam profiles for minimum concrete volume. Includes animated force diagrams, seepage flow visualization, and exportable engineering reports per USBR and USACE standards.
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Crude Oil Fractionation Tower Simulator
Professional atmospheric distillation column simulator with TBP curve analysis, product yield optimization, temperature profiling, energy balance (reboiler/condenser duty), reflux ratio effects, and multi-crude comparison. Covers LPG through vacuum residue for 6 crude assays including Arabian Light, Brent, WTI, Maya Heavy, Bonny Light, and Urals.
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Leadership Coaching Simulator: Interactive Leadership Style Assessment
Free interactive leadership style assessment and coaching simulator. Practice Hersey-Blanchard situational leadership, OODA Loop, Cynefin Framework, and stakeholder analysis with animated radar charts and scenario-based coaching.
View SimulationYour Personal AI Tutor — Running Locally in Your Browser
Meet your new study companion. Our AI Tutor runs entirely on your device using WebGPU — no cloud servers, no subscriptions, no data leaving your computer. Choose from three models based on your device's capabilities and get instant help understanding any simulation.
Lite
~1.4 GB • Desktops, laptops & Chrome iOS (experimental)
Fast responses for quick questions. Perfect for phones, tablets, and older laptops.
Standard
~2 GB • Desktops & laptops only
Best balance of speed and quality. Great for most laptops and desktops.
Advanced
~2.3 GB • Desktops & laptops only
Best reasoning for complex physics problems. Requires modern GPU with 4GB+ VRAM.
Device Compatibility
You Decide What We Build Next
Simulations4All isn't just a library of tools - it's a community. Every week, you vote on which simulation gets built next. Have an idea? Propose it. Love someone else's idea? Vote for it. The winning proposal each Friday becomes our next project, and the proposer gets credited on the finished simulation.
1. Propose Ideas
Submit one simulation idea per day. Describe what you want to learn or teach.
2. Vote Daily
Cast one vote per day for your favorite proposal. Change your vote anytime.
3. We Build It
Every Friday, the top-voted simulation wins. We build it and credit the proposer.
Explore by Category
Browse simulations organized by subject area
Astronomy
Stars, planets, galaxies
7 simulationsBiology
Cells, genetics, ecosystems
19 simulationsChemistry
Reactions, molecules, elements
14 simulationsComputer Science
Algorithms, data structures
47 simulationsEarth Science
Geology, weather, climate
5 simulationsEngineering
Structures, circuits, systems
161 simulationsFinance & Economics
Financial concepts, investment strategies, and economic principles.
32 simulationsHealth
Body systems, disease prevention, and wellness.
16 simulationsMathematics
Algebra, geometry, calculus
12 simulationsPhysics
Mechanics, waves, thermodynamics
49 simulationsSocial Sciences
Policy models, social dynamics, and decision-making.
9 simulationsReady to Get Started?
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