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Dev tools · December 12, 2021

Percival

A reactive language for data analysis and visualization

Percival launched on December 12, 2021 with 83 votes, #544 of 2,707 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 4 years on.

Visit percival.ink ↗Percival alternativestop 20% of December 2021

What it does

Percival is a declarative data query and visualization language. It provides a reactive, web-based notebook environment for exploring complex datasets, producing interactive graphics, and sharing results.

Percival is a declarative data query and visualization language for exploring complex datasets, producing interactive graphics, and sharing results.

Does a similar job

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  • Percival – Web-based reactive Datalog notebooks, made with Rust+Svelte2021 · github.com · ▲22

    📝 Web-based, reactive Datalog notebooks for data analysis and visualization - ekzhang/percival

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  • Microsoft releases Flint, a visualization language for AI agentsJul 2026 · microsoft.github.io · ▲350

    Data visualizations are the bridge between user and data. But building AI agents that can generate visualizations reliably can be very tricky: - simple chart specs can be reliable, but generated charts are often of low quality due to reliance on system defaults; - complex chart specs with explicit details can produce good-looking charts, but they are verbose and agents can struggle with reliability We figured out it is a limitation on the language issue (not just AI capability thing) -- current visualization languages are a bit too low-level for AI agents, requiring them to explicitly make…

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