Short answer
These are not two versions of the same product, so "which works better" is partly the wrong question. A nasal strip is a spring that pulls the nasal valve open from outside. Mouth tape opens nothing; it closes a route and forces air through whatever nose you already have. They also fail differently: a strip that does nothing has cost you the price of the strip, while tape used by someone with untreated obstructive sleep apnoea seals the fallback route for air on an airway already narrowing. For a large share of readers the honest answer is neither, and the next step is assessment rather than a purchase.
EIVOI sells both and makes money whichever you choose, which is exactly why "often neither" belongs at the top of the page.
What each one physically does
A nasal strip is a spring. An external nasal dilator is adhesive tape with springy plastic bands laminated inside. Stuck across the bridge of the nose, the bands try to flatten out and pull the soft outer walls of the nostrils apart. It acts on the nasal valve, the narrowest part of the nasal airway, which a review by Dinardi and colleagues in the International Journal of General Medicine puts at roughly 50 to 60 per cent of total resistance to airflow through the nose.
Mouth tape is a seal. Skin-safe adhesive across the lips, meant to keep the mouth shut so air goes through the nose all night. It does not widen the nasal valve, hold the throat open, or change your anatomy. Its entire effect is subtraction: it removes one of two ways to breathe.
One adds capacity to a channel; the other closes a channel and relies on the remaining one being adequate. Mouth tape assumes a working nose; a strip assumes nothing about your mouth.
Nobody has run the head-to-head
There is no trial randomising people to a strip against tape with sleep-study measurements on both arms. The two have separate, small evidence bases. Every page directly comparing them that I could find is published by a company selling one or both. This page is no exception; the difference is that we are saying so.
A meta-analysis of nasal dilators by Majed Alnabulsi in Cureus on 3 January 2026 pooled 17 studies and 496 participants and found no significant difference in snoring index, apnoea-hypopnoea index or minimum oxygen saturation, concluding they cannot be recommended as monotherapy. Our piece on whether nasal strips work for snoring has the detail.
On mouth taping, the systematic review by Jess Rhee, Brian Rotenberg and colleagues at London Health Sciences Centre in Ontario, published in PLOS ONE on 21 May 2025, pooled ten studies and 213 patients and concluded the data does not support it as a sound clinical intervention for the general population with sleep-disordered breathing. Only two of the six studies measuring the apnoea-hypopnoea index found a significant improvement, and both were in people with mild apnoea screened to exclude nasal obstruction first. That is the detail to carry away: the studies finding any benefit had already removed the people most likely to be harmed.
The safety asymmetry, which should decide this for most people
Both can fail, but the failures are not the same size, and pretending otherwise is how comparison articles mislead people.
A nasal strip failing means unchanged snoring, irritated skin, or a strip that peels off at 2am. Its one real harm is indirect: feeling better while nothing has changed. A crossover trial by Yagihara and colleagues in the Journal of Clinical Sleep Medicine in 2017 tested a nasal dilator strip against CPAP in severe obstructive sleep apnoea and found it improved sleepiness and mood scores while changing no polysomnographic measure. The paper's own title calls it an effective placebo.
Mouth tape failing carries that same risk of delay and adds a mechanical one underneath it. Four of the ten studies in the PLOS ONE review explicitly discussed asphyxiation in the presence of nasal obstruction. Sleep Foundation, in guidance medically reviewed by Dr Anis Rehman, lists who should not tape: people with untreated obstructive sleep apnoea, nasal blockage from allergies, a deviated septum or a cold, asthma or COPD, children, anyone with anxiety or panic, and anyone at risk of vomiting in their sleep. The Thoracic and Sleep Group Queensland, a clinical sleep service, also notes that people mouth-puff around tape, breathing through the mouth anyway while believing they are not.
Even if the two were equally effective, which nobody has shown, the risk-weighted comparison is not a tie. One fails at the cost of wasted money; the other fails in a way that depends on facts about your airway you may not know. Our page on whether mouth taping is safe lists the contraindications.
Who each one might actually suit
A nasal strip is a reasonable low-stakes trial if your problem clearly starts at the nose and the rest of your sleep is unremarkable: allergic or seasonal congestion, pregnancy rhinitis, nostrils that pinch shut when you breathe in hard, a partner who finds the snoring an irritation rather than an alarming noise. Give it a fortnight, and take an outside opinion on whether anything changed.
Mouth tape has a much longer list of prerequisites, and all have to hold. You are an adult, assessed and free of sleep apnoea. Your nose is clear, and you can sit still with your mouth closed and breathe through it comfortably for several minutes while awake. You have no reflux, asthma, adhesive allergy, or anxiety about having your mouth covered. You have not been drinking and are not on sedating medication, which is why alcohol makes people sleep through things they would normally wake for. Miss one condition and the answer is no for tonight.