PulseGatePost-LLM software, agents & workflows market (since 2022)
Coverage
168,037

Apps indexed

 

Freshness
48 min ago

Last update

 

Cadence
1,484/day

7-day average

Indexed today: 850

PulseGate

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Harper

writewithharper.com·Other productivity

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.

Open SourceApache-2.0
WebEmbeddablemacOSCLICloud-managed
H
Harper preview
Visit writewithharper.com↗
⭐10.8k
stars
🍴365
forks
✓12
features
📅2023
since

Overview

12 features

Harper is an Other productivity product. It focuses on ensuring privacy-respecting, offline grammar and spell checking without sending writing data to the cloud. Harper is an open-source project aimed at developers and writers. The project is open source (Apache-2.0). Harper is available 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. Across PulseGate's embedding index, Harper has few near neighbours, marking it as relatively distinct. Among its 12 catalogued features are grammar checking, spell check, and offline mode.

  • ✓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

Tags

offline-grammarprivacy-checkereditor-extensionlanguage-serveropen-source-tool

Built with & integrations

Framework
sveltekit
Runs on
BrowserEmbeddablemacOSCLICloud-managed

Trust & compliance

LicenseApache-2.0
Verified signals
✓ HTTPS✓ Open Source✓ Free tier✓ GitHub · ★ 10.8k✓ Active maintenance✓ Store-verified publisher

Recent events

Latest indexed changes and source events

  1. IndexedJun 17, 7:03 PM

    writewithharper.com discovered by the PulseGate indexer

    Source: PulseGate indexerOpen ↗

Frequently asked questions about Harper

What is Harper?
Harper focuses on ensuring privacy-respecting, offline grammar and spell checking without sending writing data to the cloud. It is catalogued under Other productivity on PulseGate.
Who should use Harper?
Harper is an open-source project built for developers and writers.
Does Harper have a free plan?
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?
PulseGate's automated liveness checks currently classify Harper as active. The GitHub repository shows 324 commits in the last 90 days.
What tools are similar to Harper?
Similar tools tracked by PulseGate include Harper, Harver, and Refine.HarperHarverRefine
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.

At a glance

Pricing
Open Source
Platforms
Web
Languages
English
Open source
Yes · ★ 10.8k
License
Apache-2.0
First seen
Feb 15, 2024
Activity
🟢 Active
Status
🟢 Active
Built for
developers and writers
Model
Open source
Solves
Ensuring privacy-respecting, offline grammar and spell checking without sending writing data to the cloud.

Developer

Automattic
Community-driven
↗ GitHub

Open source

View on GitHub →
⭐ Stars
10,850
🍴 Forks
365
Open issues
618
Last commit
4w ago
Commits 90d
324
Contributors
120
Authorship
Community-driven
Default branch
master
Latest release
v2.5.0 · 1mo ago

PulseGate index

Confidence
Medium · 74
Indexed
Jun 17, 2026
Lifecycle
Alive
Activity
Active
First seen
Feb 2024
Last seen
4w ago
Freshness
Unknown
Identity audit (9)
Entity ID
cmqifvwjq062o8m65f9fcpdmk
Slug
private-grammar-checker-harper-writewithharper-com
Verification state
Indexed for public listing
Claim / listing state
Unclaimed · listed: yes
Index status
Included in index
Latest evidence snapshot
Jun 17, 2026
Timeline basis
Indexed-at chronology (no inferred launch/funding milestones).
Last updated
Jul 10, 2026
Canonical URL
https://writewithharper.com/

Similar apps

Other apps tracked under the same category.

  • Harper
    harper.fast
  • Harver
    harver.com
  • Refine
    refine.sh
  • Harmony
    useharmony.com
  • Grambo App
    gramboapp.com
  • TextFixer
    textfixer.co.uk