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Tools · Comparison

Grammarly vs Harpa.ai vs Writefull

All three are writing & content tools. Here is what separates them.

GrammarlyHarpa.aiWritefull
What it isGrammarly makes AI writing convenient. Work smarter with personalized AI guidance and text generation on any app or website.HARPA AI combines every AI in one Chrome extension: OpenAI GPT-5.4, Anthropic Claude 4.6, Google Gemini 3.1, Grok, Perplexity, DeepSeek. It automates your…Writefull is automated writing and proofreading for academics, using the most advanced AI to date
CategoryWriting & ContentWriting & ContentWriting & Content
PricingFreemium · $12-$15/moFree · FreePaid
How it billsFlat monthlyFreeNot published
Free tierYesYesNo
Rating4.6 from 15,000 reviewsNot yet ratedNot yet rated
Features
  • Grammar & spelling check
  • Tone detection
  • Clarity suggestions
  • GrammarlyGO AI writing
  • Plagiarism detection
  • Browser extension
  • Desktop app
  • Brand tones
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What works
  • Works everywhere
  • Excellent accuracy
  • Free tier is useful
  • Non-intrusive
  • Trusted by millions
  • Has a free tier, so it can be tried before paying
  • Free to use
  • Sits in Writing & Content, one of the better-covered categories here — easy to compare
  • Sits in Writing & Content, one of the better-covered categories here — easy to compare
What does not
  • Premium required for advanced features
  • Can be over-aggressive
  • Limited creative writing support
  • Privacy concerns
  • 206 other tools in this catalogue claim to do the same job
  • No free tier — it has to be paid for before it can be tried
  • Does not publish a price on its own site, so the cost is only clear after signing up
  • 206 other tools in this catalogue claim to do the same job
  • 80 tools in the same category have a free tier
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