HiGuard runs locally in your browser and flags unfilled placeholders as you type. Hit send with a "{{company}}" still there and it stops you instantly — nothing leaves your machine. Works on Gmail, LinkedIn, Outlook, and any web editor.
HiGuard runs silently in the background. No dashboards, no learning curve.
Add HiGuard from the Chrome Web Store. Takes ~10 seconds. No account required.
Compose in Gmail, LinkedIn, Outlook, and most web-based messaging tools like normal.
Hit send or Cmd+Enter and HiGuard shows an alert if placeholders remain. Go back and fix — or send anyway.
Every feature exists to save you from one thing: sending a broken message.
Placeholders turn red as you type or paste. You see the problem before you hit send.
Catches {{double braces}}, {single braces}, [[double brackets]], [brackets], and <angle brackets>.
Detects send buttons in 35+ languages. Works regardless of your browser language.
Right-click any placeholder to permanently dismiss it. Manage your ignore list from the popup.
See how many placeholders are on the page at a glance — right on the extension icon.
Common patterns like [sic], [edit], and [citation] are automatically ignored. No false positives.
Full Tab, Enter, and Escape support in the warning modal. No mouse needed.
Save your best outreach templates with required fields marked. Insert with one click.
Coming SoonWhen context is available (open LinkedIn tab, email thread), HiGuard suggests what to fill.
RoadmapOne mistake can undo weeks of relationship-building. HiGuard makes sure it never happens.
Send hundreds of cold emails without a single placeholder slip.
Reach out to candidates without accidentally leaving in merge fields.
Submit cover letters and networking messages that always look polished.
Pitch investors and partners with messages that read like they were handwritten.
HiGuard works in most web-based editors — Gmail, LinkedIn, Outlook, and many others. No extra apps, no switching tools.
The latest release is live on the Chrome Web Store.
Right-click any highlighted placeholder to permanently dismiss it. Manage from the popup.
The extension icon now shows how many placeholders are on the page in real time.
Common editorial patterns like [sic] and [edit] are automatically skipped.
Tab, Enter, and Escape work in the warning modal. Fully accessible, no mouse required.
Install HiGuard in 5 seconds. Free, private, no account needed.
v0.3 · Chrome Web Store · No data collected