Comparison
Offline versus cloud: the difference is your data, not the algorithm.
Most cloud checkers run reasonable rules. The choice is really about whether the work can leave your machine, and what you can prove about the result afterwards.
Same input, different instruments.
Offline, in the browser
The rules ship with the page and run on your device.
Cloud checker
Your input is uploaded and analysed on someone else's server.
What leaves your machine
Nothing. The file is parsed in memory and discarded when you close the tab.
The full submission, plus whatever is attached to it.
Works on client or pre-release material
Yes, without a data processing agreement.
Only after a contract, a review and a retention policy.
Speed
Deterministic and local, so a report returns in under a second.
Bound by upload time and queue depth.
Reproducibility
Same input, same rules, same result — you can re-run it a year later.
Depends on the provider's model and rule versions that day.
Explainability
Every finding names the rule that fired, so you can disagree with it.
Varies. Some expose logic; most return a score and a summary.
Rule changes
Versioned with the product; you see what changed and when.
Usually vendor-side, sometimes silently.
Cost model
No per-call cost, because there is no server call.
Per seat, per scan or per token.
What it cannot do
Run the app, judge whether a claim is true, or read a file type it does not support.
Nothing you could not have done locally, except at larger scale.
When cloud is the right answer
If you need to check thousands of documents a week without a human in the loop, or you want a provider to hold the audit trail for you, a cloud service is a reasonable buy. Scale and custody are real needs.
The mistake is treating a cloud check as the default for work you would not email to a stranger yet.
When offline is the right answer
Anything under an NDA, anything regulated, anything a client has not yet approved for distribution, and anything you want to check before you have decided whether to keep it.
Offline also wins on the thing teams underestimate: willingness to run it. A check that cannot leak is a check people run on drafts.
Run it yourself
Find out what your AI output is hiding.
The console is free, needs no account and uploads nothing. See the findings first, then decide whether you want a specialist to sign it off.