Reach vs Frequency: The Real Difference
By Affan Siddiqi, Founder, Psycomaths
Reach is how many unique people saw an ad; frequency is how many times the average person in that audience saw it. A reach problem means the audience itself is too small or too saturated. A frequency problem means the same people are seeing the ad too often, which is a creative and pacing issue, not an audience-size issue. Confusing the two leads to the wrong fix.
A shrinking reach points at audience size, not creative
If reach is declining while spend holds steady, the audience itself is the constraint, usually because it's too narrow for the current budget level. The fix is expanding or rebuilding the audience, not touching the creative.
Climbing frequency points at creative, not audience size
If frequency is climbing while reach stays flat, the same group of people is simply seeing the ad more often because nothing new is going out to replace it. This is a creative-refresh and pacing problem, and expanding the audience alone doesn't fix it if the creative keeps getting shown repeatedly to the same core group.
The two can move together and still need different fixes
A shrinking audience and climbing frequency often happen at the same time, since a smaller pool naturally gets shown the same ad more often. In that case, both the audience and the creative need attention, not just one of them.
Frequency caps help less than people expect
A hard frequency cap limits how often one person sees an ad, but it doesn't fix the underlying cause. If the real issue is an audience too small for the budget, a frequency cap just throttles delivery instead of solving the constraint, often at the cost of spend efficiency.
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