Clue Birth Control is only similar to the rhythm method and other fertility awareness methods in the sense that they make pregnancy risk predictions based on a person’s menstrual cycle. The rhythm method is the oldest of these methods and was developed before algorithms like the one underlying Clue Birth Control existed. For many fertility awareness-based methods there is a lack of high quality research on their effectiveness, meaning that we don’t actually know how effective they are with perfect use. These methods require following specific guidelines, so they can be particularly sensitive to incorrect and inconsistent use. By contrast, the FDA has robustly assessed the effectiveness and indications for use of Clue Birth Control (Clue Birth Control works with 92% efficacy with typical use and 97% with perfect use). A table showing the various methods in this category, and their specific efficacy rates, is available from a manuscript published in the British Medical Journal by independent FABM experts.
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