Changes / Grammarly / Increased latency across Grammarly product offerings

Grammarly: Critical incident: Increased latency across Grammarly product offerings

Summary

Grammarly reported a critical degradation causing intermittent or slow features, login trouble, and “Service unavailable” errors from 2026-03-09 16:52 UTC to 2026-03-09 20:07 UTC, lasting 3 h 14 min. A fix implemented at 19:15 UTC restored login and use of Grammarly and Superhuman; the incident was resolved.

Machine-written from the diff below (Sol; type: incident degradation). Check the diff before relying on it.

Major incidentLabel: degradation (model (Jev), 62%)Changed Detected Source: stspg.io

What changed

AddedTitle#1
Before: not present
After: Increased latency across Grammarly product offerings
AddedImpact#2
Before: not present
After: critical
AddedStatus#3
Before: not present
After: resolved
AddedStart time#4
Before: not present
After: 2026-03-09 16:52 UTC
AddedResolved time#5
Before: not present
After: 2026-03-09 20:07 UTC
AddedAffected components#6
Before: not present
After: Generative AI assistance, Grammarly Editor, Grammarly for Android, Grammarly for iPad, Grammarly for iPhone, Grammarly for Mac, Grammarly for Microsoft Office, Grammarly for Microsoft Word on Mac, Grammarly for Windows, Grammarly's Browser Extension, Login, Plagiarism Detection, Writing Suggestions
AddedUpdateinvestigating#7
Before: not present
After: We are currently investigating an issue causing Grammarly's product offerings and features to work intermittently or slower than usual. We will update you as soon as we have more information. Thank you for your patience!
AddedUpdateinvestigating#8
Before: not present
After: We're continuing to investigate this issue. Some Grammarly users may have trouble logging in or see "Service unavailable" when trying to use Grammarly.
AddedUpdateinvestigating#9
Before: not present
After: We're still looking into this issue. We'll provide an update as soon as we can.
AddedUpdatemonitoring#10
Before: not present
After: We've implemented a fix, so you should be able to log in and use Grammarly and Superhuman. We're monitoring the results of this fix and will provide further updates.
AddedUpdateresolved#11
Before: not present
After: This issue has been resolved.

First version of this incident archived by Rewindex. View the live incident.

History of this incident

When (UTC)ChangeKind
Critical incident: Increased latency across Grammarly product offerings (this change)
Grammarly reported a critical degradation causing intermittent or slow features, login trouble, and “Service unavailable” errors from 2026-03-09 16:52 UTC to 2026-03-09 20:07 UTC, lasting 3 h 14 min. A fix implemented at 19:15 UTC restored login and use of Grammarly and Superhuman; the incident was resolved.
Major incident

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