simulator.io is a web-based logic circuit CAD and simulation tool aimed at learners who want to βbuild a computer from scratch.β Users can place components such as logic gates, flip-flops, buttons, and displays in the browser, connect them with the wiring tool, and click RUN for real-time simulation. It covers logic-level design scenarios ranging from simple switches to complex CPUs, with a stronger focus on education and experimentation than industrial-grade EDA.
The editor supports common CAD operations such as undo/redo and copy/paste, and provides basic workflows for placing components, wiring, running, and resetting circuits. In simulation mode, users can interact with switches and buttons in real time, control clock signals, and see powered wires highlighted; the site also states that the simulation model is deterministic. Collaboration is one of its highlights: you can invite others to the same board for synchronous editing, with up to 8 people currently supported in a single session. It can also generate snapshot permalinks, allowing even non-logged-in users to access snapshots via a link, and snapshots can be forked into the userβs own workspace.
The site explicitly says βRegister It's free,β and no paid plans, enterprise edition, or payment methods were found. The terms describe it as a private, non-commercial project by Bastian Born. Whether it is open source, supports self-hosting, or provides an API/SDK is not disclosed, so it should not be treated as a deeply integrable or privately deployable development platform.
Its strengths are a clear onboarding path and the ability to design, simulate, and share logic circuits entirely in the browser, making it suitable for classroom demos, group assignments, and individual learning. Real-time collaboration and snapshot sharing reduce the communication overhead in teaching. The drawbacks are also clear: the Plans page says development is currently paused, with the author postponing maintenance due to lack of time, and warns that the service is still unstable and not recommended for production use. The terms also state that availability and the correctness of simulation results are not guaranteed. Mobile touch support, custom ICs, user groups, website embedding, and other features remain only future plans.
It is suitable for beginners in digital logic and computer organization, as well as teachers and small study teams. It is not suitable for projects that require long-term stability, auditability, self-hosting, or industrial-grade verification. Access from mainland China cannot be determined from the available text, and there is no relevant payment information. If you need alternatives, consider Logisim Evolution, CircuitVerse, Digital, or Falstad Circuit Simulator.
β This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on simulator.io official site.
simulator.io is an Germany Dev Tools provider. TG4G tracks its product information, an overall rating of 8.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach simulator.io directly.