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Tech riderRev. 21 Sept 2026

Squire

Ch 146.3of 37 Rich Text Editor Software
  1. 1Runs onWeb
  2. 2CostsNot stated by the maker
  3. 3Deploymentself hosted
  4. 4Structured contentNo
  5. 5Media handlingImages can be inserted by URL and image paste events are exposed
4 lines stated Written from the maker's own pages: github.com
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The Squire homepage

Overview

Squire is ranked #14 of 37 in rich text editor software on Specifiction. It runs on Web.

Compared on rich text editor software

Deployment
self_hostedgithub.com
Structured content
Nogithub.com
Media handling
Images can be inserted by URL and image paste events are exposedgithub.com

Facts

Product
Squire is an HTML5 rich text editor designed to handle arbitrary HTML with cross-browser normalization.github.com · 5 Oct 2026
Package size
The README describes Squire as a lightweight package of 16KB of JavaScript after minification and gzip, with no dependencies.github.com · 5 Oct 2026
Email composition
Squire was designed for email composition in the Fastmail web app, including forwarding and quoting third-party HTML.github.com · 5 Oct 2026
Integration
Squire is designed to integrate with an application's own UI framework and does not provide its own toolbar, widgets, or overlays.github.com · 5 Oct 2026
Browser support
Squire supports reasonably recent browsers and no longer supports any version of Internet Explorer.github.com · 5 Oct 2026
Production use
The README lists Fastmail, Proton Mail, SnappyMail, StartMail, Tutanota, Zoho Mail, Superhuman, Teamwork Desk, and Google Earth as users.github.com · 5 Oct 2026
Security
The README says developers must safely convert raw HTML into DOM nodes; Squire uses DOMPurify if present or a configured custom sanitizer.github.com · 5 Oct 2026
Formatting
Squire provides editor methods for text formatting, links, lists, code, text alignment, and quote levels.github.com · 5 Oct 2026
Integration options
The README documents installing Squire with npm or loading its JavaScript file through a script tag.github.com · 5 Oct 2026
License
Squire is released under the MIT license.github.com · 5 Oct 2026
Maker history
Fastmail says it has been an independent email service since 1999.fastmail.com · 5 Oct 2026

Company

Maker and headquarters
Fastmail says it is headquartered in Melbourne, Australia.fastmail.com · 5 Oct 2026

Best Squire alternatives

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All accessCh 01 CKEditor 5 Free planFree trialAndroid from $160/mo7.7 All accessCh 02 AiEditor Free planAndroidiOS Free to start7.4 All accessCh 03 TinyMCE Free planFree trialAPI from $6.58/mo7.4 All accessCh 04 Tiptap Free planFree trialAPI from $49/mo7.4 All accessCh 05 Editor.js Free planAndroidiOS Free to start7.1 All accessCh 06 BlockNote Free planself-hostedWeb from $195/mo7.0

Where it ranks on Specifiction

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Sources