Watching is not worrying
Competitor tracking has a bad reputation, and it earns it whenever it turns into a scoreboard. A dashboard that tells you weekly whether you are ahead or behind produces exactly one emotion and no decisions.
The useful version answers two questions instead. What have they figured out that we have not, and where have they left something open. The first gives you ideas that came with evidence attached. The second gives you an opening.
Everything below is public, and all of it is visible from outside the company.
Part one: ideas that are already proved
Your competitor is running experiments in public and paying for the ones that fail. You get to read the results.
The ad that will not die. Most ads run for a few weeks. When one has been live for two hundred days, that is not inertia. Nobody keeps paying to serve a loser at scale. The longest-running ad in a competitor's library is the closest thing you will get to a free A/B test result somebody else funded, and the angle in it is usually the argument that actually converts in your category.
The offer that keeps coming back. One promotion is a campaign. The same offer appearing on a third of their running creative, six weeks in a row, is a finding. They have tested the discount depth against margin and decided this one is worth repeating. If your category is supposedly not price sensitive, that is worth knowing before your next pricing meeting.
The page built for one buyer. Ads pointing at a dedicated landing page, linked from nothing in their navigation, is a company saying which segment it thinks deserves its own argument. Nobody builds a page for a use case they are not chasing. Read the page and you have their positioning for that buyer in their own words, months before it appears in a keynote.
The creator who appears twice. Someone who shows up in organic mentions and then again inside their paid ads has been through a test. They ran the collaboration, it performed, and they put money behind it. A creator who appears once was a trial. A creator who appears in both is a result.
The bundle. A new multipack or a new set is a margin experiment with a price attached. It tells you what they believe buyers will accept in one basket, and if it stays on the site for a quarter it tells you they were right.
The claim they lead with. Order a competitor's claims from the provable to the decorative and the top of that list is what they think wins the argument. Sometimes you can prove the same thing better. Sometimes you discover that the claim you have been avoiding as too bold is one they have made for a year without consequence.
The question their content answers and yours does not. Their blog and category pages are aimed at the moments a buyer enters the category. If they have a page for a situation you have never written about, either they know something about their buyer or they are wasting effort. Both are worth five minutes.
Part two: where they are open
The same sources that show you what works show you what is not working, and weakness is quieter than success. Nobody publishes it, but it is all readable.
Their one-star reviews, grouped by theme. This is the single most useful thing in a competitor's public record. Their unhappy customers have written your product roadmap and your ad copy for free. When forty reviews complain about the same thing, that is not noise. It is a segment of their buyers telling you what they would switch for.
The weakest products in their catalogue. A company's rating is an average and averages hide things. Ranked worst first, the bottom of their range is where their reputation is being spent. If one of those products competes directly with one of your good ones, that comparison is the entire pitch.
What is sold out right now. Out of stock variants are demand they cannot serve this week. It is the most perishable opening there is and the one nobody watches, because by the time anyone notices it has been restocked.
The promises they make. A return window shorter than yours, or a delivery promise you can beat, is a line on their own site that you can quote in your own words. These change quietly and nobody announces a shortened return policy.
Reviews they do not answer. A brand that stopped replying to its reviews has either grown past caring or lost the person who did it. Both are visible from outside and both say something about how much attention their customers currently get.
The gap in their range. Sort their catalogue by price and look at the ends. A missing entry tier means the price sensitive buyer has nowhere to land with them. A missing top tier means nobody is capturing the buyer who would have paid more.
Where they are not named. Ask the buying questions in your category and see which ones return an answer that does not mention them at all. Every one of those is a question they have not earned yet, and questions are easier to win than rankings.
How the site actually performs. Not a lab score. What real visitors experience. A slow checkout on mobile is a leak they may not have measured, and it is measurable from outside.
What makes any of this usable
Every item above is a thing you could look up today. The difficulty is that each one lives on a different surface, none of them keep a history, and the value is almost always in the change rather than the state.
An ad running for two hundred days only means something if you know it was ninety days at the last check. A complaint theme matters when it is new, or when it is growing. A sold out variant is information for about a week.
So the answer to "why watch" is not that any single number is precious. It is that the interesting things are all differences, and a difference needs two readings and someone who kept the first one.
Pick one competitor. See what we find.
Your first benchmark is free. One domain, measured against you, no card and no call.