Tools · Comparison

Harpa.ai vs NBot vs Sheldon AI

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

	Harpa.ai	NBot	Sheldon AI
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…	Build custom AI trackers that monitor the web for content you care about. Discover gems, filter noise, and stay ahead in any niche. Start tracking for free.	Sheldon is an AI assistant for all your browsing needs and the best chatGPT chrome extension out there. It can write professional emails, generate code, excel…
Category	Writing & Content	Writing & Content	Writing & Content
Pricing	Free · Free	Freemium · $9.99 /monthly	Paid
How it bills	Free	Flat monthly	Not published
Free tier	Yes	Yes	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	—	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