Harper
Harper is an open-source grammar and spell checker that runs entirely on your device, ensuring privacy for developers and writers. It supports multiple English dialects and integrates with browsers, editors, and desktop environments. No data leaves your machine, making it ideal for privacy-conscious users.
Overview
12 featuresHarper is a Writing & editing project. It focuses on ensuring privacy-respecting, offline grammar and spell checking without sending writing data to the cloud. It is built as an open-source project for developers and writers. Harper is open source under the Apache-2.0 license. It runs on the web, embeddable surfaces, macOS, and the command line.
Harper first shipped in 2023. The project is developed in the open on GitHub with 10.8k stars and 324 commits in the last 90 days. Among its 12 catalogued features are grammar checking, spell check, and offline mode.
Summary written by a language model from the project’s public pages.
- Grammar checking
- Spell check
- Offline mode
- Privacy-first
- Browser extension
- Editor extension
- Native desktop app
- Language server
- Multiple English dialects
- No telemetry
- Open source
- Obsidian integration
Built with & integrations
- SvelteKit
- data-sveltekit- in the HTML · /_app/immutable/ in the HTML
Trust & compliance
Indexing history
1What PulseGate has recorded for this listing
Frequently asked questions about Harper
- What does Harper do?
- Harper focuses on ensuring privacy-respecting, offline grammar and spell checking without sending writing data to the cloud. It is catalogued under Writing & editing on PulseGate.
- Who should use Harper?
- Harper is an open-source project built for developers and writers.
- Is Harper free?
- Yes — Harper is open source under the Apache-2.0 license and free to use.
- What platforms does Harper run on?
- Harper runs on the web, embeddable surfaces, macOS, and the command line.
- Is Harper still active?
- The GitHub repository shows 324 commits in the last 90 days.
- How long has Harper been around?
- Harper first shipped in 2023.
- Is Harper open source?
- Yes — Harper is open source under the Apache-2.0 license, developed on GitHub.
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