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
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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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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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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PID Controller Tuning Simulator
Free PID controller tuning simulator. Adjust proportional, integral, and derivative gains to optimize step response. Visualize overshoot, settling time, and steady-state error in real-time. Perfect for control engineering students. Try it free!
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Robot Arm Kinematics Simulator
Free 2D robot arm kinematics simulator with forward and inverse kinematics for 2-6 DOF arms. Add or remove links dynamically, drag joints, click-to-reach IK targets, auto-animate, and trace end-effector paths. Visualize DH parameters, workspace envelopes, Jacobian matrices, and joint trajectories with HiDPI canvas rendering.
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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.
View SimulationNewest Simulations
Recently published simulations fresh from our lab
Wastewater Nutrient Recovery Simulator
Professional wastewater nutrient recovery simulator comparing phosphorus (struvite crystallization), nitrogen (ammonia stripping), carbon (biogas/biomethane), and biosolids recovery options. Features animated treatment train flow, Sankey mass-balance diagrams, product revenue analysis, energy balance, regulatory compliance checking (EPA/EU WFD), CAPEX/OPEX economics, and configuration optimization. Supports municipal WWTP, industrial food processing, and agricultural digestate scenarios.
View SimulationIsland Mode Stability & Load Priority Tool: Simulate Microgrid Load Shedding and Frequency Response
Simulate microgrid island-mode operation with our free professional tool. Model load shedding priorities, frequency stability via droop control, ROCOF analysis, battery SOC depletion, and generator step-loading per IEEE 1547 and NFPA 110. Includes V&V against published microgrid islanding studies.
View SimulationEV Charging + Battery + Solar Site Optimizer: Size Solar PV, Storage, and Chargers for Maximum ROI
Optimize EV charging sites with co-located solar PV and battery storage using our free professional tool. Model DCFC and L2 charger loads, solar generation profiles, battery dispatch for peak shaving and demand charge management, grid interconnection limits, and TOU rate arbitrage. Calculate NPV, payback period, solar self-consumption, and revenue from charging. Run PV+battery sizing sweeps for optimal configuration. Validated against NREL REopt methodology and SAM solar output data.
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
20 simulationsChemistry
Reactions, molecules, elements
14 simulationsComputer Science
Algorithms, data structures
54 simulationsEarth Science
Geology, weather, climate
8 simulationsEngineering
Structures, circuits, systems
197 simulationsFinance & Economics
Financial concepts, investment strategies, and economic principles.
34 simulationsHealth
Body systems, disease prevention, and wellness.
19 simulationsMathematics
Algebra, geometry, calculus
12 simulationsPhysics
Mechanics, waves, thermodynamics
51 simulationsSocial Sciences
Policy models, social dynamics, and decision-making.
18 simulationsReady to Get Started?
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