HiGuard is a Chrome browser extension designed to prevent users from sending emails or messages containing unfilled template placeholders, such as {{Name}} or [Company]. It addresses the common problem of accidentally sending incomplete, templated messages by detecting and flagging placeholder text in real time as users compose messages in web-based editors. The extension operates entirely locally within the browser, ensuring that no message content leaves the user's machine.
The tool highlights unfilled placeholders instantly as users type or paste content, turning them red for immediate visibility. When a user attempts to send a message with unresolved placeholders, HiGuard displays a warning and provides options to either correct the message or proceed with sending. It supports detection of multiple placeholder formats, including double braces, single braces, double brackets, brackets, and angle brackets. HiGuard also features multi-language send detection, recognizing send buttons in over 35 languages regardless of browser language. Users can right-click to ignore specific placeholders permanently and manage their ignore list from the extension popup. Additional features include a badge count on the extension icon showing the number of placeholders present, smart filtering to automatically skip common editorial patterns like [sic] or [edit], and full keyboard accessibility in the warning modal.
HiGuard is intended for anyone who frequently sends outreach or professional messages, such as sales representatives, recruiters, job seekers, founders, and networkers. It is compatible with Gmail, LinkedIn, Outlook, and most other web-based messaging tools, requiring no additional apps or workflow changes. The extension is free to install from the Chrome Web Store, requires no user account, and collects no data from messages.
A template library feature allows users to save outreach templates with required fields marked for quick insertion. Planned future updates include AI-powered suggestions to help fill in placeholders using available context, such as open LinkedIn tabs or email threads. HiGuard aims to help users avoid embarrassing mistakes and maintain a professional impression in their communications.
In the Other productivity space, HiGuard takes a focused approach. It prevents users from accidentally sending emails or messages with unfilled template placeholders. It is built as a consumer product for professionals and outreach teams using web-based messaging. The product is available for free. The product ships for the web and embeddable surfaces.
Key capabilities include placeholder detection, local processing, and works in web editors.
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