You have 90 minutes a week for SEO, maybe less, and every guide you find assumes you're a content team of six with a Semrush seat and a quarterly planning offsite. Here's how to do a keyword gap analysis for your SaaS blog without any of that — using free tools, one spreadsheet, and a process built for someone who also has to ship product this afternoon.
Most gap analysis tutorials are written for agencies. They start with "build a competitor list," then "export 2,000 keywords," then "cluster into topics," and by step four you've burned your entire week and you're staring at a spreadsheet you'll never open again. That's not a gap analysis. That's a research project with no deadline.
The version that actually works for a solo founder or two-person team is smaller, faster, and ruthlessly filtered. You're not trying to find every keyword gap. You're trying to find the six or seven you can realistically win this month. (For the concept and the longer-form version, see the complete keyword gap analysis guide.)
How Do You Do a Keyword Gap Analysis for a SaaS Blog?
A keyword gap analysis for a SaaS blog means comparing your ranking keywords against two or three direct competitors to find terms they rank for and you don't. You pull each competitor's ranking keywords, filter by low difficulty and clear buyer or user intent, then cross-reference against your own site to isolate the gaps worth writing about first.
Here's the compressed version, in order:
- Pick two to three competitors who target the same user, not the biggest names in your category.
- Pull their ranking keywords using a free-tier tool or Google's own data.
- Export your own ranking keywords the same way.
- Cross-reference the lists and isolate keywords they rank for that you don't.
- Filter that list by keyword difficulty under 30 and clear informational or commercial intent.
- Rank what's left by "winnability" — how realistic it is you outrank them in 60-90 days.
- Pick the top five and turn each into a one-paragraph content brief.
That's the entire loop. Under an hour once you've done it twice. The first time will take closer to ninety minutes because you're still figuring out which competitors actually matter.
Step 1: Choose the Right Competitors (Not the Obvious Ones)
This is where almost everyone gets it wrong, and it's the single biggest reason gap analyses produce useless keyword lists. You are not looking for the company your sales team loses deals to. You're looking for whoever ranks next to you on Google for the terms your buyers actually search.
A well-funded competitor with a ten-person content team and three years of backlinks is not a fair fight. If Domain A has a domain rating of 65 and yours is 22, every "gap" you find will be a keyword you can't realistically take within a year. That's not a gap — that's an aspiration. Our guide to competitor keyword research for SaaS goes deeper on picking the right set.
Instead, search five or six of your core terms in an incognito window and note who shows up on page one alongside you, or just above you. Look for sites in a similar authority band — roughly within 10-15 points of your own domain rating if you're using a tool that reports it, or just similar site age and content volume if you're not. Two or three of these search competitors is enough. More than that and you're drowning in overlap instead of finding signal.
Step 2: Pull Competitor Keywords Without Paying for Semrush or Ahrefs
You don't need an enterprise SEO suite for this part, and that surprises most founders who've only ever seen this process taught through a paid tool's UI. Ahrefs' free Webmaster Tools, Google's own autocomplete and "People also ask" boxes, and Ubersuggest's limited free searches will get you 80% of the way there for a blog with fewer than a few hundred competing keywords, which describes almost every indie SaaS site. There's a full rundown of the free keyword gap tool options worth trying.
Here's the actual move: run each competitor's blog domain (not homepage — the specific blog subfolder) through a free keyword checker, export whatever ranking list it gives you, and don't worry about volume yet. You're building a raw list first, filtering second. Trying to filter and collect at the same time is how people burn two hours instead of twenty minutes.
If you already have a Google Search Console connection for your own site, pull your existing ranking queries from there too — you'll need them for the cross-reference in step 4, and GSC data is more accurate than any third-party tool's estimate of your own rankings anyway.
Step 3: Filter the List Before You Do Anything Else
Six hundred keywords is not a content plan. It's noise. The filtering step is where the hour either gets spent well or gets wasted, and most people skip straight to writing without doing it.
Cut anything with a keyword difficulty above 30 if you're pre-revenue or under $10k MRR — you simply don't have the domain authority to compete for harder terms yet, no matter how good the article is. Cut anything with clear brand intent (a competitor's product name attached to the query) since you're not going to outrank them for their own name. Cut anything where the search intent doesn't match a blog post — if the top results are all product pages or App Store listings, a blog article won't crack page one no matter how well it's written.
What survives this filter is usually 15-40 keywords out of the original few hundred. That's your actual gap list.
Step 4: Cross-Reference Against What You Already Rank For
This is the step most tutorials gloss over, and it's the one that separates a real gap analysis from a competitor keyword dump. A keyword only belongs on your list if your competitor ranks for it and you genuinely don't — not "you rank on page 4 and want to rank higher." That's a different problem with a different fix.
Take your GSC query list or your own keyword export and remove any overlap. What's left is the true gap: terms with demonstrated demand (because a competitor already ranks for them) and zero existing footprint on your site. This is also where you'll catch keyword cannibalization risks before they happen — if a term is close to something you already half-cover, you want to know now, not after you've published a near-duplicate post.
Step 5: Score for Winnability, Not Just Volume
Volume is a vanity metric if the keyword is unwinnable. A keyword with 40 searches a month and a difficulty score of 12 will do more for your blog in the next quarter than one with 2,000 searches a month and a difficulty score of 68, because you'll actually rank for the first one. Winnability beats volume every time. (If difficulty scores are a black box, keyword difficulty explained breaks down what they measure.)
Score each surviving keyword on three things: difficulty relative to your current domain strength, how closely the intent matches something you can credibly write (a tool comparison, a how-to, a definition post), and how directly it connects to your product's actual use case. A keyword that's easy to rank for but has nothing to do with what you sell is a wasted article, no matter how fast it ranks.
Rank your list, take the top five, and you've got a month of content already prioritized. This is also roughly where long-tail keywords tend to cluster — specific, lower-volume, high-intent, and exactly the profile a smaller site can win fastest.
The Mistake That Wrecks Most Gap Analyses
Here's the part nobody tells you: the process above works, but it fails constantly in practice for one reason — founders run it once, generate a list, write three articles, and never touch it again. A gap analysis is not a one-time artifact. Search results shift, competitors publish new content, and a keyword that was winnable in January can be crowded out by June.
The second mistake is treating every gap keyword as equally worth writing. Some gaps exist because the keyword genuinely doesn't matter to anyone, including your competitor, who's ranking for it by accident with a page that gets no clicks. Check that the ranking competitor page actually looks intentional (real word count, internal links pointing to it, decent on-page structure) before you assume the keyword is worth chasing.
And the third failure mode is stopping at the spreadsheet. A finished gap analysis with no publishing pipeline behind it is just a to-do list you'll feel guilty about in three months. This is the exact gap WriteGap was built to close — it runs this comparison against your real competitors automatically, delivers the filtered, scored keyword briefs weekly instead of as a one-off export, and turns the top picks into SEO-ready drafts for WordPress or Shopify without you touching a spreadsheet at all.
What to Do With the Gaps You Find
A gap list is only useful if it turns into published articles on a schedule, not a spreadsheet tab you revisit "eventually." Once you've got your five prioritized keywords, write a one-paragraph brief for each: target keyword, the intent it satisfies, two competitor URLs currently ranking, and the angle you'll take that's different from theirs. That's enough for a first draft.
If you've already connected Google Search Console, you also have a second, faster source of gaps sitting untouched: queries you're already getting impressions for but ranking on page two or three. Those are striking-distance keywords, and they're often easier wins than anything on your competitor gap list because Google has already decided your page is relevant — it just needs a push. WriteGap's GSC integration flags these automatically and suggests specific on-page fixes, which is usually a faster path to a ranking improvement than writing a brand-new article from scratch.
Run this whole process — competitor selection, keyword pull, filtering, cross-reference, scoring — once this week, and set a recurring 45-minute block to repeat it every four weeks. That cadence is what separates founders who publish two great articles and stall from the ones who compound their rankings quarter over quarter. If budget is the constraint, our playbook on keyword gap analysis with no SEO budget covers the free-tool path in full.