Tools · Comparison

Grammarly vs Harpa.ai vs Promptify

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

	Grammarly	Harpa.ai	Promptify
What it is	Grammarly 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…	Free AI Writing App for Unique Idea & Inspiration. Seamlessly bypass AI writing detection tools, ensuring your work stands out.
Category	Writing & Content	Writing & Content	Writing & Content
Pricing	Freemium · $12-$15/mo	Free · Free	Paid
How it bills	Flat monthly	Free	Not published
Free tier	Yes	Yes	No
Rating	4.6 from 15,000 reviews	Not yet rated	Not yet rated
Features	Grammar & spelling check Tone detection Clarity suggestions GrammarlyGO AI writing Plagiarism detection Browser extension Desktop app Brand tones	—	—
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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