Tools · Comparison

Harpa.ai vs Skim It vs Writefull

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

	Harpa.ai	Skim It	Writefull
What it is	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…	Email any article link to go@SkimIt.ai and receive an AI-generated summary in your inbox within minutes. No app, no signup — just email.	Writefull is automated writing and proofreading for academics, using the most advanced AI to date
Category	Writing & Content	Writing & Content	Writing & Content
Pricing	Free · Free	Paid	Paid
How it bills	Free	Not published	Not published
Free tier	Yes	No	No
Rating	Not yet rated	Not yet rated	Not yet rated
Features	—	—	—
What works	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	The vendor lists 6 distinct capabilities 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	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	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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