OmniLab is a browser-based virtual chemistry laboratory for chemistry students. Learners can choose from 38 substances, assemble a supported setup, and request an educational prediction across 34 supported reaction pairs, with an equation, explanation, safety guidance, and visual effect. The current public release is free to use without an account and includes 25 chemistry guides linked to prepared experiments. Predictions are educational aids and do not replace supervision, trusted references, or physical-lab safety.