Opace tools · Software and skills
Tools built by Opace.
Browse our web apps, WordPress plugins, browser extensions, Astro tools, Agent Skills and selected reference collections.
Current releases
Tools you can use, inspect, and improve.
App Free, no email required
Planning calculator UK Website Cost Calculator: Estimate Setup, Build & Ongoing Ownership Costs
Estimate setup and ownership costs for a UK website, compare DIY, freelancer, and agency routes, and inspect the sources and assumptions behind every result.
AI Free, local-first browser tools
AI checker tools Free AI Checker Tools: Content Verification, Integrity & Watermark Checks
Our free AI checker tools inspect text locally, protect factual anchors and review named evidence without presenting detector or watermark guesses as proof.
ToolSuite Free, no email required
Google Preferred Sources suite Add as Preferred Source Button, Popup & Analytics for Google (SEO & AI Overviews)
A free WordPress plugin plus a Google Preferred Source eligibility checker and button generator: popup button, shortcodes, smart placement and honest click analytics.
AstroIntegration Public source on GitHub
Astro add-on Astro Visual Editor: Change Text, SEO & Drag & Drop Sections in the Front-End
Edit rendered text and SEO, reorder declared sections, review a queue of changes, and write validated updates back to Astro source files.
WordPressPlugin GitHub release and WordPress.org listing
WordPress AI infrastructure Opace AI Hub: Free OpenAI, Claude & Gemini API Integration WordPress Plugin
Store provider keys encrypted, discover live models, share prompts and record usage for compatible WordPress plugins such as AI Scribe.
WordPressPlugin GitHub release and WordPress.org listing
WordPress plugin AI Scribe: Free AI SEO Content Creator & Humanizer WordPress Plugin
Plan, write, illustrate, review and publish search-optimised WordPress articles with OpenAI, Anthropic Claude or Google Gemini.
ToolSuite Chrome 5.0.1 and WordPress 2.0.0 available
Chrome and WordPress SEO audit Essential SEO Toolkit: Free SEO Audit Tool for Chrome & WordPress
Run a private on-page audit, review local accessibility and current-visit Web Vitals, then open finding-led deeper checks with the page address supplied.
App Open-source on GitHub
Website feedback app Opace Annotate: Visual Feedback & Website Critique Tool for Design Mockups
Review HTML mock-ups and live websites with pin-based feedback, responsive viewport checks, saved comments, and shareable PDF reports.
Opace Agent Skills
Practical skills for the people building with AI.
Our open-source skills package repeatable design, accessibility, motion, and development experience into clear instructions for coding agents and their human teams.
Open-source skill collection
Opace Agent Skills
Practical Agent Skills for web design, UI, motion, accessibility and future SEO workflows across Codex, Claude Code, Cursor, Copilot, Gemini, and other coding agents. Browse Agent Skills↗Design and motion skill
AI UI/UX Motion Engine
A focused Opace Agent Skill for distinctive AI website design, UI/UX, motion graphics and 3D web work, with practical production guidance. View the motion skill↗Why Opace builds tools
Small pieces of software can remove a lot of repetitive work.
We build these products when the same task keeps slowing a project down. The UK Website Cost Calculator makes scope, labour, and ownership assumptions visible. The Essential SEO Toolkit, our free Chrome and WordPress audit toolkit, reviews a chosen page locally, explains the findings and opens relevant deeper checks with the page address supplied. AI Scribe and Opace AI Hub, our free WordPress AI plugins, give WordPress editors a structured writing process. Astro Visual Editor brings reviewable front-end changes to source-controlled sites.
The code and listings also show how our team approaches practical product development. If you need a custom tool, plugin, or web application, our web app developers can help from specification through to testing and release.