Zasper
4X Better IDE than Jupyterlab
Zasper launched on February 25, 2025 with 11 votes, #1,584 of 5,999 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
Zasper is blazingly fast and scales to all your CPU cores unlike Jupyterlab and uses only a quarter of RAM and CPU used by Jupyterlab. While Jupyterlab uses around 104.8 MB of RAM and 0.8 CPUs, Zasper uses 26.7 MB of RAM and 0.2 CPUs.
Zasper is a high-performance IDE for Jupyter notebooks: up to 5× less CPU and 40× less RAM than Jupyter Server, in a single 8 MB binary.
Zasper is built from the ground up for massive concurrency: a minimal memory footprint, exceptional speed, and thousands of connections at once. It speaks Jupyter's wire protocol, so it runs the notebooks you already have. Both servers were run against the same workload — 10 requests per second per kernel, on an Apple M4 — from 2 concurrent kernels up to 100. Zasper starts ahead and stays ahead, and the distance grows with concurrency rather than shrinking. CPU is averaged across each run; RAM is the highest figure observed, which is what “up to 40×” reports. At light load the difference is closer to 3–4× on both — the advantage is a function of concurrency,…from zasper.io
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Zasper – A High Performance IDE for Jupyter Notebooks2025 · github.com · ▲7Benchmarking Zasper v/s JupyterLab (Jupyter Server) - zasper-io/zasper-benchmark
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