Copy usually fails quietly: nobody objects, nobody reacts either. This run gives you the reaction per segment, so you can see the difference between a line that lands and a line that is simply ignored.
You have two or three versions of a line and no way to choose between them other than taste and seniority. Spending budget to find out which one works is a slow and expensive way to run an A/B test.
What you want before that spend is a read on which segment each version speaks to, and whether any of them actively puts a segment off.
Headline, body, call to action. Include the offer, because a line is judged together with what it is selling.
The run weights the panel to the market you pick, so you see the reaction of the whole cross-section, not just the people you were writing for.
Look for a version that gains a segment without losing another. A line that lifts one group and repels a second is usually the more expensive option.
Reynard is a simulation. It is not fieldwork, it carries no statistical significance, and it cannot replace talking to a customer. Treat it as a fast, structured second opinion that tells you where to look — not as evidence.
One check costs nothing and needs no account. You see the format of the output before you decide whether it is worth paying for a full run.
Start the free check