Compare

Cervical Cap vs Fertility Awareness

A side-by-side comparison of two birth control methods — efficacy, cost, how they work, and who shouldn't use them.

Last verified October 11, 2026Updated October 11, 2026

Side-by-side comparison

Cervical Cap A small silicone cap that fits over the cervix by suction, used with spermicide before sex.
Fertility Awareness Tracking body signs like temperature and cervical mucus to identify fertile days and avoid unprotected sex then.

Method	Cervical Cap A small silicone cap that fits over the cervix by suction, used with spermicide before sex.	Fertility Awareness Tracking body signs like temperature and cervical mucus to identify fertile days and avoid unprotected sex then.
Efficacy	Cervical Cap 78% typical use Least effective: under 90 out of 100 people successfully prevent pregnancy per year.	Fertility Awareness Least effective
Cost	Cervical Cap $0–$90 Insurance: Usually	Fertility Awareness $0–$20 Insurance: Varies
Duration	Cervical Cap Reusable for up to 2 years (replace sooner if worn or damaged)	Fertility Awareness Ongoing daily tracking
Reversibility	Cervical Cap Reversible	Fertility Awareness Reversible
STI protection	Cervical Cap No	Fertility Awareness No
How it works	Cervical Cap A small silicone cap fits snugly over the cervix and stays in place by suction, blocking sperm from entering the cervix. Used with spermicide inside the cap.	Fertility Awareness Track basal body temperature, cervical mucus, and cycle length to identify the fertile window. Avoid unprotected sex or use backup contraception on fertile days.
Prescription	Cervical Cap Required Hybrid (Fitting or Ship)	Fertility Awareness Not required Self-Directed
Side effects	Cervical Cap Vaginal irritation from spermicide Unusual vaginal discharge Toxic shock syndrome risk if worn during a period	Fertility Awareness None reported
Who shouldn't use this	Cervical Cap Cervical anomaly preventing fit Active pelvic infection Sensitivity to silicone or spermicide Inability to insert or remove reliably History of toxic shock syndrome High risk of HIV exposure (because of the spermicide)	Fertility Awareness Irregular cycles that make fertile window prediction unreliable Inability to track consistently Recent childbirth, breastfeeding, or perimenopause (cycles unstable)

Key differences

How long it lasts: Cervical Cap, reusable for up to 2 years (replace sooner if worn or damaged); Fertility Awareness, ongoing daily tracking. A prescription is needed for Cervical Cap, not for Fertility Awareness. Cervical Cap: costs $0–$90. Fertility Awareness: costs $0–$20.