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Additor
Techstars '18San Francisco, US · Founded 2017 · 7 employees on LinkedIn · 2 known investors
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Also known as Additor
Investors · 2
How we know: the Techstars portfolio · open dataset · Top 3000 Accelerator Startups (no YC) 2026-08 · Not right? Tell us
Company profile
researched Sep 2026▸Full profile — technology
Technology
Additor maintains a public GitHub organization whose repositories center on web content capture and rich-text editing. Its own library, html-extract-js, is a JavaScript library that extracts HTML documents to collect metadata and core contextual information from infinite web pages, and another in-house project, additor-transformer-textdelta-js, works on making TextDelta content searchable. The organization also maintains forks of widely used open-source editing and document components, including Quill and its Parchment abstraction, a Quill/HTML converter, Facebook's Draft.js editor framework, Mozilla's pdf.js PDF reader, the Handsontable data grid and react-mentions, as well as a fork of a Vercel AI SDK and Google Gemini generative-UI chatbot template. All listed repositories are archived, with the most recent update activity recorded in May 2024.
Compiled by commissioned research from 3 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
▸Research sources · 3
primary sources listed
- Additor · GitHubgithub.com · web
3 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- Who are Additor's investors?
- Additor's investors include Techstars, Transpose Platform Management.
- Where is Additor headquartered?
- Additor is headquartered in San Francisco, US.