Content gap analysis is the process of identifying keywords or topics your competitors rank for that your own site doesn't currently cover — or covers only thinly — revealing concrete opportunities for new content.
Rather than brainstorming content ideas from scratch, content gap analysis works backwards from real competitive data: comparing the set of keywords one or more competitor sites rank for against your own site's current ranking keywords, and surfacing the terms where a meaningful gap exists. A gap might mean a competitor ranks and you have no content on the topic at all, or it might mean you have thin or underperforming content on a topic a competitor covers much more thoroughly. This approach tends to surface genuinely validated opportunities, since a competitor already ranking for a term is direct evidence that content on that topic can perform, rather than a guess at what might work.
Content gap analysis turns content planning into something backed by competitive evidence rather than guesswork, which is especially valuable for a newer site trying to prioritise a content calendar without years of its own ranking history to draw insight from.
Illumae's content gap analysis tool (an in-app dashboard feature, not a public marketing page) compares your site's content against competitors' ranking keywords to surface topics you're missing or under-covering — a starting point you can then feed directly into AI content generation to close the identified gaps.
A handful of genuinely comparable competitors (similar size, audience, and niche) tends to give more useful results than one or a very large number — too few misses opportunities, too many can surface gaps that aren't realistically relevant to your specific audience.
Not necessarily — a gap is a validated opportunity, not an obligation. It's still worth judging each one against your own site's actual audience, goals, and capacity before committing content resources to it.
It's more valuable done periodically, since competitors keep publishing and your own content keeps ageing — a gap analysis that's a year old may already be missing newer competitor content or newer gaps that have since opened up.
No credit card required. See real output for your own business before you pay anything.