Safetyper

Free#61 of 88 in Grammar Checkers

Safetyper: A self-managed browser checker for technical users who bring their own AI access. Ranked #61 of 88 in Grammar Checkers by our editors (3.0/10); pricing: Open source; best for technical users wanting self-managed AI checking.

3.0/10★★☆☆☆Editor score

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At a glance

• Editor score
  3.0 / 10
• Pricing
  Open source
• Best for
  Technical users wanting self-managed AI checking
• Paid from
  Free
• Facts checked
  21 Sep 2026

• Where it wins

  • Supports local Ollama models plus OpenRouter and Groq API keys
  • Detects editable web fields across sites such as Gmail, Slack, and Notion
  • Shows inline diffs and uses caching to reduce API calls

• Where it doesn't

  • Requires access to an external model provider or local Ollama
  • Browser-based coverage does not extend beyond supported web fields
  • Users must manage their own provider keys and model access

Our verdict on Safetyper

Safetyper is an open-source browser extension for real-time grammar, spelling, and punctuation corrections while users type on websites such as Gmail, Slack, and Notion. It is aimed at technical users and privacy-conscious individuals or teams who want browser-based AI writing assistance while supplying their own model access. The extension supports Chrome and Firefox, with universal input detection across editable web fields.

Its provider support is the central part of the product’s ecosystem fit. Users can connect OpenRouter or Groq with their own API keys, or use a local Ollama model. Safetyper also includes secure API key storage and key-format validation, while its open-source model supports a self-managed approach. This setup gives technical users control over which AI provider processes text, but it also means the experience depends on configuring an external provider or local model rather than using an included writing service.

The inline visual diff display makes suggested changes easier to review by showing the difference between existing and proposed text. Real-time correction covers grammar, spelling, and punctuation, and smart caching is designed to reduce API calls. Those features make Safetyper a focused fit for people who want AI checking directly inside editable web fields. It is less suitable for users seeking a broader writing application, standalone desktop coverage, or a turnkey checker that does not require provider credentials or model access.

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Safetyper pricing

Safetyper fact sheet

Safetyper integrations

Safetyper lists 3 integrations on its own site.

• OpenRouter
• Groq
• Ollama

Alternatives to Safetyper

• GrammarlyA broad writing assistant with strong grammar, tone, rewriting, and AI coverage.9.4
• LanguageToolA broad multilingual checker with open-source and self-hosting options.9.2
• Microsoft EditorA strong Microsoft 365 writing assistant with focused platform coverage.9.0

See all Safetyper alternatives →

Featured on iTechGuides

Safetyper is listed in our Grammar Checkers directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update