Cervical CapvsExternal Condom

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

Side-by-side comparison

Method	Cervical Cap A small silicone cap that fits over the cervix by suction, used with spermicide before sex.	External Condom A non-hormonal barrier method that also lowers the risk of STIs, available over the counter.
Efficacy	Least effective see details Least effective: under 90 out of 100 people successfully prevent pregnancy per year.	87% typical use Least effective: under 90 out of 100 people successfully prevent pregnancy per year.
Cost	$73–$97 Insurance: Usually	$0.5–$3 /per unit Insurance: Varies
Duration	Reusable for 2 years (replace every 2 years or sooner if damaged)	Single use
Reversibility	Reversible	Reversible
STI Protection	No	Yes
How it works	A small silicone cap fits snugly over the cervix and stays in place by suction, blocking sperm from entering the uterus. Used with spermicide inside the cap.	A physical sheath worn over the penis that blocks semen from entering the vagina and reduces skin-to-skin contact that transmits STIs.
Prescription	Required Prescription required	OTC No prescription / OTC
Side effects	Vaginal irritation from spermicide Discomfort if not fitted correctly Unusual vaginal discharge if left in too long	Rare local irritation from latex or lubricants
Who shouldn't use this	Cervical anomaly preventing fit Active pelvic infection Sensitivity to silicone or spermicide Inability to insert or remove reliably	Known allergy to latex (use polyisoprene or polyurethane instead)

Key differences

Cervical Cap duration: Reusable for 2 years (replace every 2 years or sooner if damaged). External Condom duration: Single use. Only External Condom protects against STIs. Cervical Cap requires a prescription; External Condom does not. Cervical Cap: costs $73–$97. External Condom: costs $0.5–$3 per unit.