The shortlist
4 things that do it.
A counter-surveillance kit with an RF detector and a lens finder, sold by US maker KJB Security Products.
- Free
- No free tier; a hardware kit.
- Paid
- from $799.99 (MSRP, USD)
- Best at
- Detecting wireless cameras by radio signal and finding lenses by LED reflection, which KJB says works whether devices are on or off.
- The catch
- KJB lists an MSRP of $799.99, with purchase through a dealer log-in and counter-surveillance sales final. Nothing on the page covers UK shipping. Fing notes RF detectors can give false positives from routers and Bluetooth speakers.
- hardware
A 2021 research system, recorded by Yonsei University, that uses a phone's time-of-flight sensor to find lens reflections.
- Free
- Not a product; no pricing.
- Paid
- price not checked
- Best at
- In the researchers' test with 379 participants it reached an 88.9% detection rate, against 46.0% using just the naked eye.
- The catch
- It is a research paper, not a product we could link to for download, and it relies on a time-of-flight sensor on the phone.
- research prototype
Fing's guide describes shining a torch to catch lens reflections and using the front camera to spot infrared LEDs.
- Free
- Free: uses a torch and your phone's camera.
- Paid
- from Free
- Best at
- A free way to catch lens reflections and some infrared LEDs, with no extra equipment.
- The catch
- Not all phone cameras show infrared equally, per Fing's guide.
- any phone
The same shortlist, as a table
| Thing | Free tier | Paid from | Platforms | The catch |
|---|---|---|---|---|
| KJB DD1206 Pro (RF detector and lens finder kit)rel="nofollow noopener" | No free tier; a hardware kit. | $799.99 (MSRP, USD) | hardware | KJB lists an MSRP of $799.99, with purchase through a dealer log-in and counter-surveillance sales final. Nothing on the page covers UK shipping. Fing notes RF detectors can give false positives from routers and Bluetooth speakers. |
| LAPD (research app prototype)rel="nofollow noopener" | Not a product; no pricing. | not checked | research prototype | It is a research paper, not a product we could link to for download, and it relies on a time-of-flight sensor on the phone. |
| Manual check with a torch and your phone camerarel="nofollow noopener" | Free: uses a torch and your phone's camera. | Free | any phone | Not all phone cameras show infrared equally, per Fing's guide. |
How we checked
What we read, and what we haven't tested yet.
On 2026-10-02 we read Fing's hidden camera guide, its pricing page and its App Store and Google Play listings, the KJB Security Products DD1206 Pro page, the Yonsei University record of the LAPD paper, Airbnb's Help Centre page on security cameras and legislation.gov.uk's text of section 67 of the Sexual Offences Act 2003. We didn't test any app or detector. Several statements about Fing's limits, and about other detection methods, come from Fing itself.
If none of these fit
The manual way.
The nearest alternative is a physical sweep. Fing's guide suggests checking smoke detectors, clock radios and anything facing the bed, then using a torch in a dark room to catch lens reflections and your front phone camera to look for infrared LEDs. If you find a camera, it suggests reporting it to the platform (such as Airbnb), documenting it with photos or video and contacting local authorities. Airbnb's Help Centre says hidden cameras have always been prohibited, and section 67 of the Sexual Offences Act 2003 sets out the voyeurism offences in England and Wales, so go to the police if you think a crime has happened.