Neural Network Simulator
Build, configure, and visualize neural networks with live forward pass
What is Neural Network Simulator?
Neural Network Simulator is a free online tool that lets you build a small neural network — input layer, one or more hidden layers, output layer — and run a real forward pass in your browser. Choose ReLU, Sigmoid, Tanh or Softmax, move the input sliders, and watch every neuron's value light up on the network canvas. Weights are deterministic, so the same setup always gives the same numbers: ideal for building intuition before touching PyTorch.
How to use Neural Network Simulator
Step 1: Set the Architecture — input size, neurons per hidden layer (L1, L2; add more layers with Add, remove one with the trash icon) and output size. Step 2: Move the Input Values sliders and pick an activation — ReLU, Sigmoid, Tanh or Softmax. Step 3: Press Forward Pass. The canvas draws neurons and weighted connections (green = positive weight, red = negative), and the panel lists each hidden layer's values plus the final output vector.
Frequently Asked Questions — Neural Network Simulator
Is Neural Network Simulator free to use?
Yes — Neural Network Simulator is a free online tool by DSWallah. No signup, no install, no limits for normal use. It runs entirely in your browser.
Do I need to install anything for Neural Network Simulator?
No. It works online in Chrome, Edge, Firefox or Safari on mobile and desktop. Your data never leaves your device.
Does the simulator train the network (backpropagation)?
It simulates the forward pass — how values flow from inputs through weights and activations to the output. For step-by-step backpropagation (how a network actually learns), use the free Backpropagation Visualizer tool.
What does Softmax do in this tool?
Softmax turns a layer's raw values into probabilities that sum to 1 — select it and watch the hidden-layer values change shape. ReLU, Sigmoid and Tanh act on each neuron separately.
Learn the skill behind the tool: AI Course in Lucknow · Gen AI Course
Related free tools: Backpropagation Visualizer · Cnn Visualizer · Gradient Descent Simulator · Ml Playground