---
title: "Preswald"
pageType: "tool-profile"
schemaVersion: "1.0"
snapshotId: "tv-20260915-f4c107995a2e"
generatedAt: "2026-09-15T07:02:20.000Z"
canonicalUrl: "http://toolvitals.com/tools/preswald/"
jsonUrl: "http://toolvitals.com/api/agent/tools/preswald"
indexable: true
---

# Preswald

Preswald is a WASM packager for Python-based interactive data apps: bundle full complex data workflows, particularly visualizations, into single files, runnable completely in-browser, using Pyodide, DuckDB, Pandas, and Plotly, Matplotlib, etc. Build dashboards, reports, and notebooks that run offline, load fast, and share like a document.

## Decision context

- Status: critical
- ToolVitals score: 10/100
- Health score: 17/100
- Shipping score: 0/100
- Score mode: verdict
- Data confidence: 90/100
- Source coverage: 80/100
- Last evidence check: 2026-09-15

## Classification

- Use case: BI & Dashboards (bi-dashboards)
- Category: Data & Analytics (data)
- Tool mode: Source-visible project
- Openness: OSI-approved OSS
- License: Apache-2.0
- Tags: open-source, ai, analytics, analytics-engineering, copilot, data, data-applications, data-infrastructure, data-pipelines, data-sdk, data-visualization, gpt, llm, python, schema-management, vscode

## Public repository signals

- Repository: [StructuredLabs/preswald](https://github.com/StructuredLabs/preswald)
- Stars: 4271 (adoption context only)
- Forks: 646
- Open issues: 330
- Last commit date: 2026-06-12
- Releases in 90 days: 0

## Source receipts

- [Official website](https://preswald.com/) — checked 2026-09-15
- [Source repository](https://github.com/StructuredLabs/preswald) — checked 2026-09-15

## Discovery status

- Search indexable: yes
- Reason: sufficient tool evidence

## Interpretation limits

- ToolVitals scores summarize bounded public maintenance, shipping, openness, and evidence signals. They are not user-review ratings.
- GitHub stars and related popularity metrics are adoption context, not quality evidence.
- Missing values mean not collected or not confidently established; they do not mean zero.
- Public signals do not prove security, uptime, support quality, customer satisfaction, or production suitability.
- Verify material decisions against the linked first-party sources and your own requirements.