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Private Grammar Checker - Harper

Harper is a Chrome extension that works as an English grammar checker, described as built for 21st Century English. It is open source and checks documents locally in milliseconds rather than sending text to servers, and the developer states it uses a small memory footprint compared with other grammar checkers. The extension has about 50,000 users and a 4.2 rating from 121 reviews on the Chrome Web Store.

Appearances
11
Categories
1
First seen
13 September 2026
Latest
26 October 2026
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Recorded measurements

Published observations only. Missing dates are not zero, and points do not establish what happened between observations. Each source and unit is shown separately.

Chrome Store extensions · ratings

Chrome Store extensions · 11 dated measurements

Latest value shown: 132 ratings ·

Higher values appear higher on the chart. The scale covers the recorded values.

Chrome Store extensions: ratings recorded measurements11 dated points, 6 Sept 2026 to 24 Oct 2026. Values range from 116 to 132 ratings. Higher values appear higher. Open the exact values and published evidence below for the data table. Dots are not connected; missing dates are not zero.6 Sept 2026: 116 ratings8 Sept 2026: 117 ratings13 Sept 2026: 119 ratings21 Sept 2026: 121 ratings27 Sept 2026: 124 ratings5 Oct 2026: 127 ratings9 Oct 2026: 128 ratings16 Oct 2026: 129 ratings18 Oct 2026: 130 ratings21 Oct 2026: 131 ratings24 Oct 2026: 132 ratings
View 11 exact dated values and published evidence
Exact values and their published evidence
Measured onValue (ratings)Published in
116
117
119
121
124
127
128
129
130
131
132

“Measured on” uses the original observation date. “Published in” links to the edition that reported it; the dates may differ.

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Appearance history

11 appearances
This page records every appearance of the same entity in the reviewed RiseFinder exports. Rankings keep the original category, period and measurement direction.

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