TL;DR — the short answer
- A Cochrane review found no evidence that ultrasonic apps or buzzers prevent mosquito bites.
- A scent-based wristband is a different thing: a wearable, complementary layer that releases essential oils close to you — handy for children who dislike sprays, evenings outdoors or between applications.
- There is no credible evidence that ultrasonic sound (from phone apps or plug-in gadgets) repels mosquitoes.
- Health authorities (CDC, ECDC) recommend skin-applied repellents with proven actives — DEET, picaridin, or plant-based PMD — plus covering up and removing standing water.
- On exposed skin, especially in high-risk areas, a clinically proven PMD spray should be the core of your protection — a wristband can add to it, an app cannot.
Every summer the same two products come up: scented wristbands, and smartphone apps that claim to drive mosquitoes away with a high-pitched whine. Both are chemical-free and convenient — so it is worth asking a simple question: do mosquito wristbands and ultrasonic apps actually work? The honest answer is that they are not the same thing. Ultrasonic apps do not work; a scent-based wristband can be a useful complementary layer, as long as exposed skin still gets a proper repellent. Here is what the research shows and how to combine them.
Do mosquito-repellent wristbands work?
Scent-based repellent wristbands carry essential oils such as citronella, lemongrass or geraniol, which are released close to where you wear them. Their effect is localised, so they work best as a wearable, complementary layer rather than as your only protection.
Where a wristband fits
A wristband is not a substitute for a repellent applied to the skin, and public-health bodies base their advice on skin-applied repellents. Where it earns its place is as an extra layer: for children who dislike sprays, on an evening outdoors, or between applications of your skin repellent.
How to use a scent wristband well
Treat a wristband as one layer of several. Wear it on the wrist or ankle, keep applying a skin repellent to exposed skin — especially in high-risk areas — and add clothing, screens and nets where needed. For children, check the minimum age on the product label.
Do ultrasonic mosquito apps and devices work?
Ultrasonic repellents — phone apps and battery buzzers — claim to emit a high-frequency sound that either mimics a dragonfly (a mosquito predator) or a male mosquito, supposedly scaring away the biting females. It is a neat story with no scientific support.
A Cochrane systematic review — the gold standard for weighing medical evidence — examined field trials of electronic (ultrasonic) mosquito repellents and concluded there is no evidence that they prevent mosquito bites, and therefore no justification for marketing them to prevent mosquito-borne disease. Entomologists point out that mosquitoes do not navigate or flee by the frequencies these gadgets produce; the underlying premise is simply wrong. A free app draining your battery will not keep a hungry Aedes or Anopheles away.
What about citronella candles, coils and plug-ins?
These can help, but with limits. A citronella candle or a mosquito coil can modestly reduce landings in still air close to the source, yet the effect drops sharply with distance and disappears in a breeze. Plug-in vaporisers that release an insecticide (such as a pyrethroid) can help indoors in an enclosed room, but none of these replace protecting your actual skin when you are outdoors.
Wristbands, apps and skin repellents: a quick comparison
| Method | What the evidence shows | Reliable bite protection? |
|---|---|---|
| Scent-based repellent wristband (essential oils) | Releases essential oils close to you; a wearable extra layer, not a skin repellent | Complementary layer — use alongside a skin repellent |
| Ultrasonic app or buzzer | Cochrane review: no evidence of any effect | No |
| Citronella candle / coil | Small reduction close to source; fails at distance or in wind | Partial, situational |
| Indoor plug-in vaporiser | Can help in an enclosed room | Partial, indoors only |
| Skin-applied repellent (PMD, DEET, picaridin) | Recommended by CDC and ECDC; hours of proven protection | Yes |
What actually prevents mosquito bites
Public-health bodies are consistent about what works. The approach that reliably reduces bites — and the diseases mosquitoes can carry, from malaria to dengue and West Nile — combines a few simple measures:
- Apply an effective repellent to exposed skin. The CDC and ECDC recommend proven actives: DEET, picaridin (icaridin), IR3535 and plant-based PMD (para-menthane-3,8-diol), which can be derived from lemon eucalyptus oil or — as in incognito® (Citrepel®) — from Java citronella.
- Cover up with long, loose, light-coloured clothing at dawn and dusk, when many biting species are most active.
- Remove standing water around your home — buckets, plant saucers, blocked gutters — so mosquitoes cannot breed.
- Sleep under a net or screen windows in high-risk areas.
In other words: skip the app, put a proven repellent where the mosquito actually lands — on your skin — and add a scent wristband as an extra layer if it suits you.
How incognito® helps
If ultrasonic gadgets are out, a reliable skin repellent is in. Our Insect Repellent Spray uses PMD (Citrepel®), the same plant-based active class that the CDC and ECDC list alongside DEET — but it is DEET-free, vegan and biodegradable. It is clinically proven and recommended against both mosquitoes and ticks, so a few sprays on exposed skin form the core of your protection. As a complementary layer, our wooden insect repellent bracelet releases Java citronella, lemon eucalyptus and peppermint oils from a refillable capsule and is suitable from 3 years. If you want to understand why we build around a plant active rather than DEET, our guide to whether natural insect repellents actually work goes deeper.
FAQs
Do mosquito repellent bracelets really work?
Think of a bracelet as a complementary layer rather than stand-alone protection. A scent-based bracelet releases essential oils close to you, which makes it handy for children who dislike sprays, for evenings outdoors or between applications. On exposed skin — especially in high-risk areas — a proven skin repellent remains your core protection.
Do ultrasonic mosquito apps work?
No. A Cochrane systematic review found no evidence that electronic or ultrasonic repellents prevent mosquito bites, and there is no scientific basis for the sound-repels-mosquitoes claim.
What is the difference between a wristband and a repellent spray?
A spray coats your exposed skin, so a repellent layer sits exactly where a mosquito would land. A wristband releases its scent close to where you wear it, so it works best alongside a skin repellent rather than instead of one.
Do citronella candles keep mosquitoes away?
Only slightly, and only close to the flame and in still air. The effect fades quickly with distance or a breeze, so a candle is a mild extra — not a substitute for repellent on your skin.
What is the most effective way to avoid mosquito bites?
Apply a repellent with a proven active — PMD, DEET or picaridin — to exposed skin, cover up at dawn and dusk, and remove standing water where mosquitoes breed.
Is PMD as effective as DEET?
PMD is a plant-based active class that the CDC and ECDC recommend alongside DEET. It offers comparable protection at appropriate concentrations, without DEET, and is biodegradable.
Sources
- Cochrane — Electronic mosquito repellents for preventing mosquito bites and malaria infection
- CDC — Prevent Mosquito Bites
- ECDC — Protective measures against mosquitoes
- EPA — Find the Repellent that is Right for You
- NHS — Insect bites and stings
This article is for general information only and is not medical advice. If you are travelling to an area with malaria, dengue or other mosquito-borne disease, follow official guidance and speak to a healthcare professional about prevention.