local-harper

Browser-based grammar checker that runs entirely locally using the Harper engine.

Webfree

local-harper is a free, open-source, browser-based grammar checker built on the Harper engine, running entirely on-device with no server or account, offering live grammar checking, an issue sidebar and toggleable rules. It's aimed at writers who want grammar checking that never sends their text to a server, unlike most cloud-based grammar tools.

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Behind the summary, Matchbox keeps a richer profile of local-harper - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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