I wanted to share a unique use case that I believe fills a gap in the smart home space: lock state detection without replacing your lock or using a smart lock .
After searching high and low, I couldn’t find any off-the-shelf sensor that could tell me whether a traditional door lock was turned and locked – until now.
So I built one.
The Problem:
Smart locks are expensive, invasive, or not landlord-friendly.
Contact sensors only tell you if the door is open or closed — not whether it’s locked.
There was no device that could reliably detect the actual lock turn (especially for euro cylinders or key/thumb turn locks).
I’ve developed and launched Locksure – the first retrofittable device that monitors whether your door is locked or not, without controlling the lock or replacing any hardware.
Installs in minutes with adhesive
Works on euro cylinder locks (key or thumb turn)
Sends real-time lock/unlock alerts via a hub and app
Integrates easily with smart home (Alexa at the moment) platforms via cloud APIs (or future direct MQTT)
Smart Home Use Cases:
Know if a door is actually locked, not just closed
Alert if your cleaner forgets to lock up
Give peace of mind to parents, caregivers, or landlords
Automate lights, scenes, or security modes based on lock state
I’m exploring native Home Assistant integration, but for now it works via cloud or webhook integrations.
Could also be that British families specifically forget to lock their door.
Most likely it won’t work with our lock. Our has a 12 o´clock spring loaded neutral position.
Twist it clockwise will lock it, then it springs back.
Twist it counter clockwise will unlock and then it springs back to neutral position.
It’s rather convenient but impossible to use with smart door lock retrofit things.
Sure I could replace it all, but that is not permitted.
Hi Guys, yes we do have common issue here where people forget to lock their doors. Eg if you are leaving the house with the kids and can’t remember if you locked the door, you have to turn the car around to check. Also we have found that a lot of people with parents that have dementia have more peace of mind that Mum or Dad are not inside with a false sense of security. OCD is another use case - basic point is that even if the door can be seen from your vantage point you still have to physically try the handle to be sure.
With all due respect, this has all the markings of vapourware at best, and a scam at worst.
This post and the entire site seem AI generated. There’s not a single actual product photo apart from a couple of grainy gifs showing installation on the home page. Installation videos are all computer-generated models and the reviews are suspicious at best (the AI-generated customer photos don’t help me trust that the review below isn’t also AI-generated).
Searching around doesn’t help increase my confidence in this product, either. Amazon has only 2 reviews, one of which was from someone who got the product for free. Google Playstore app says it has 1+ downloads, which I’m assuming to mean less than 10. Clicking the link for the developer of the app just says it’s not found.
Finding the Apple app was an adventure, to say the least. No amount of hunting on the locksure site or on Google would return any results. Finally tracked the link down by finding the official youtube channel and checking the description (where all comments are disabled).
I’m sorry - I know you say you’re just starting out, but the above are all massive red flags. At the very least, post some actual photos and videos of your product in action so potential customers can have an idea of what to expect.
Hi @ShadowFist - thank you very much indeed for the critique - you are right we are starting out but we will get onto getting these changes made. Happy to take some really video and post.
We actually opted for a cleaner look using CGI but, yes I see your perspective. Will be good to see if others agree.
I do confess when setting up the website we may have used AI in parts but honestly not all! Is that really bad?
We actually received some training from a crowdfunding site called luanchboom and they seemed to use the fast gif images in a lot of their promos so we went with that - maybe we need to look at that again.
Honestly we have been really encouraged by the number of people buying it for their folks and monitoring their doors through door sharing feature and now want to get it out there more!
You will also notice that the second amazon review is a vine review - this is where you offer the product for free to get a review. However it’s a game of patience and after selling good handful we finallly got a paying customer review. Still using both the website and amazon Chanels. Also getting a few local locksmiths on board but really excited about this and have been working on it for four years now!
So just trying to gather some momentum
Here is a picture of the device on a customer door:
I suspect you are located outside the UK? we did quite a bit of market research with Facebook ads last year and found that people in Europe were more inclined to go for a product that was centred around privacy - eg information only without giving electronic control to an app (hacking concerns + independence for older customers). The US market was more interested in smart locks that actually actuate the lock but there definitely was some interest. We actually have designs for units for the Kwikset locks however given our location, these findings and significantly lower ad costs we decided to start with the UK and then work outwards.
The Problem:
The Solution:
Smart Home Use Cases:
