SPICE Netlist Simulator Online
Simulate a SPICE netlist online (op/tran/ac) with ngspice — in-page waveforms, DC node voltages and the full log, no local install.
Processing and data safety
Section titled “Processing and data safety”Requires sign-in and uses the daily free cloud quota. Netlists run on server-side ngspice, are used only for that job and are auto-deleted per the retention policy.
Input and output
Section titled “Input and output”- Formats: SPICE, CIR, SP, NET, CKT
- Flow: SPICE netlist → waveforms and simulation log
How to use
Section titled “How to use”- Sign in, then choose a SPICE netlist file (.cir/.sp/.net/.ckt) — or copy the built-in RC low-pass sample netlist (shown in-page) into a .cir file to try one without writing anything.
- Pick the analysis (op/tran/ac) and set its parameters — SPICE notation like 1u or 1e6.
- Click “Process in cloud” and wait for the job (this can take up to about 10 minutes).
Key details and limits
Section titled “Key details and limits”- Requires an account; cloud tasks count against your cloud quota.
- Runs on ngspice (BSD-3). Common PSpice/LTspice-style model cards are supported; vendor-proprietary models may not be available.
- If the netlist carries its own .control block, the page parameters are ignored — the netlist’s own control commands take precedence.
Common use cases
Section titled “Common use cases”- Upload a .cir netlist → pick ac/tran → inspect the in-page waveforms → download the full log
- No netlist handy? Copy the in-page RC low-pass sample into a .cir file and run it