Tools · Comparison

OpenSEO vs Perplexity AI vs SourceAI

All three are research tools. Here is what separates them.

	OpenSEO	Perplexity AI	SourceAI
What it is	OpenSEO is the open source alternative to Ahrefs and Semrush. Keyword research, backlinks, rank tracking, and site audits, billed by usage instead of a $100-plus monthly subscription. Self-host it free, or connect it to your AI agents over MCP.	AI-powered search engine providing accurate, sourced answers using LLMs and real-time web search.	CEH-certified penetration testing for web apps, APIs & cloud. Global delivery. Fixed price from €1337. Free retest. 100% remote.
Category	Research	Research	Research
Pricing	Freemium	Freemium · $20/mo	Paid
How it bills	Not published	Flat monthly	Not published
Free tier	Yes	Yes	No
Rating	Not yet rated	4.6 from 5,400 reviews	Not yet rated
Features	—	Real-time web search Cited sources Pro Search deep research File analysis Image search Code execution Collections API access	—
What works	—	Accurate with citations Real-time information Excellent for research Clean interface Generous free tier	Sits in Research, one of the better-covered categories here — easy to compare
What does not	—	Pro features behind paywall Sometimes shallow answers Limited creative tasks Fewer integrations	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 44 other tools in this catalogue claim to do the same job 12 tools in the same category have a free tier