AI content toolsfrom Opace Free browser checker · Evidence-led
Inspect writing signals, protect exact facts and record which methods did not run. Every check but one runs on this page and sends nothing. The AI model scores on our EU server by default, or in your browser if you prefer, and no check turns a pattern prompt into proof of authorship.
Evidence stays attached to the method
The review keeps protected facts beside each proposed treatment and records unsupported methods without turning them into a score. The interface image shows the same evidence-led workflow used across the browser, WordPress, Chrome and Astro surfaces.
01 / Evidence, not guarantees
Available pages link to working browser tools. Planned routes remain non-interactive until their code, data, licensing and test evidence are accepted.
02 / How the checker works
Each result keeps exact checks apart from editorial prompts and unsupported methods, so a missing detector can never look like a pass.
Run exact character and lookalike checks, 116 named writing-signal rules across 113 categories including sentence rhythm, cadence and chat-export formatting, chatbot artefact traces attributed to the model families that leave them, and protected-content extraction, all in the browser. On a 5,558-document long-form corpus these rules flagged 45.1% of AI writing and 24.8% of human writing, so they are editing feedback and never an authorship verdict.
Every method has its own status, evidence and limitation. Uploaded images and PDF files get a local Content Credentials (C2PA) read; the beta AI model scores on our EU server by default and can be moved into your browser on explicit consent, with its measured accuracy always shown for the route that ran; unsupported and not-run checks stay visible.
Every assessment runs the published SynthID-Text detection mathematics against three public demo keys in your browser and shows the per-key result. Anthropic production keys are private, so that watermark is reported as not assessed rather than guessed. Then export a hash-only receipt that records the run without silently retaining the draft.
03 / Where your text goes
04 / Frequently asked questions
It means keeping exact text hygiene, factual anchors, method status and limitations visible while a draft is reviewed. It does not mean assigning a universal AI probability or claiming who wrote the text.
The AI Content Integrity Checker is available on this site. The other four are local candidates and none has been submitted or published. Chrome 1.0.0 and the 0.1.0 Astro, command-line and loopback-service set passed their declared checks. The WordPress plugin is at 1.0.6, and its gate evidence was recorded against the earlier 1.0.4 build: rebuilding changed the plugin’s bytes, so Plugin Check, readme validation, the package inventory and the lifecycle, REST, editor, responsive, focus and axe checks have to be re-run against 1.0.6 before it can be submitted. Downloads and directory listings will appear only after final release approval.
The available browser tools are free. In the Content Integrity Checker every check runs in your browser except the AI model, which scores on Opace’s own EU server by default and can be switched to run in your browser instead; that page states which route is in use and what was sent.
No draft is kept. The checker holds the draft in browser memory for the current run, and on the default AI model route the whole document is sent to Opace’s EU server in one request, scored in memory and then discarded; your text is not stored or logged, the request leaves no per-visitor record, and each result prints how many words were sent. Our hosting platform keeps operational logs for 30 days that contain no part of your draft. Draft text, filenames, content hashes, findings, protected spans and receipt identifiers are never placed in the page URL, cookies, local storage or site analytics.
Use the Opace contact page with the product version, browser or platform version, expected behaviour and the smallest safe reproduction. Remove draft text, authentication tokens, personal data and customer information from screenshots or logs. Contact Opace.
Created by Opace Digital Agency
Opace designs practical AI and publishing workflows for organisations in Birmingham, across the UK and internationally.
Opace AI Content Integrity
Use the free browser checker, then read the methodology before drawing a conclusion from any result.