# BT21 SMART LAMP — user reviews > 43 indexed App Store user reviews of BT21 SMART LAMP by MARKT Co,.LTD., rated 1.90/5 from 68 ratings. - Source: https://appshunter.io/ios/app/bt21-smart-lamp/id1474583015/reviews - App overview in markdown: https://appshunter.io/ios/app/bt21-smart-lamp/id1474583015.md - Rating breakdown: 5★ 9 · 4★ 0 · 3★ 5 · 2★ 16 · 1★ 38 ## Is BT21 SMART LAMP safe? BT21 SMART LAMP does not appear safe based on available data. The AppsHunter Safety Score for BT21 SMART LAMP is 45 out of 100. This assessment is based on 68 user ratings, with an App Store average of 1.9 out of 5. Of 68 App Store ratings, 13.2% point to a safe experience, 7.4% suggest some concerns, and 79.4% point to a risky experience. ## Is BT21 SMART LAMP legit? BT21 SMART LAMP is no longer available in the App Store. The AppsHunter Legitimacy Score for BT21 SMART LAMP is 35 out of 100 points across 7 verification signals from App Store and developer data. ## Newest reviews (10 of 43) ### 1/5 — app crashes *2019-10-09, version 1.0.2* the app continually crashes with the new iOS update ### 1/5 — please fix *2019-10-03, version 1.0.2* App unable to connect since iOS 13. Constantly crashes and asks for the Bluetooth passcode. ### 1/5 — frustrated *2019-10-03, version 1.0.2* i bought the lamp a couple weeks ago and at first the app was working fine but for the past week, every time i try to use it...the app crashes without fail. i’ve deleted the app multiple times and redownloaded and it still doesn’t work...i’m so frustrated with i don’t even know what to do anymore ### 2/5 — Not working with iOS 13 *2019-09-29, version 1.0.2* Before the update, the app opened up fine. But with the update, I can’t even press a button on its menu before it crashes on me. Quite annoying when it comes to wanting to change the color of the lamp or I’m out of reach to tap it to turn it off. ### 2/5 — bad *2019-09-28, version 1.0.2* the app only works like half the time so i can’t control the lamp the way i want to. PLEASE fix this issue. i’m sick of it crashing and never connecting to bluetooth or wifi. ### 1/5 — Was working fine.. *2019-09-27, version 1.0.2* This app was working fine until the update. The app crashes when I try to connect to my chimmy lamp . It would turn on and off by itself!!! Please fix ASAP!!! ### 1/5 — App keeps crashing *2019-09-26, version 1.0.2* I went to open my app and it wanted me to register my lamp again. And ever time I try it crashes. ### 2/5 — ;( *2019-09-26, version 1.0.2* it worked a couple of the first days but stopped working , also the timing function doesn’t work ### 1/5 — Not iOS 13 compatible *2019-09-26, version 1.0.2* Useless since the new iOS update, crashes ever single time. Lamps don’t show up on app anymore and Bluetooth won’t work. ### 1/5 — Always Crashing!!! 😡 *2019-09-25, version 1.0.2* Why does this keep crashing! I can’t register my lamp because the app always crashes! I can’t use the lamp properly! Please fix this. ## Most critical reviews (10 lowest-rated) ### 1/5 — It does not WORK!!!! :< *2020-12-28, version 1.0.4* It does not work lol I don’t know what to do but it’s......SO BAD. Ok let me calm down lol ok I’m fine now but it’s just.......I don’t now I don’t want to spend all my time on this one reviews lol but the point is it dose not....WORK!!!! ### 1/5 — New version *2020-03-30, version 1.0.4* Everything was going well until the latest version or update of the app, my smart map doesn’t appear to be registered anymore like before. the smart lamps name still appears on the “register mood lamp” however, whenever i tap it, the app closes and restarts. I’ve tried uninstalling; uninstalling and resetting the lamp itself, forgetting device and reentering it, nothing works... i spent so much on the product itself and shipping fee, i also just got it recently, hope my efforts and money doesn’t go to waste... ### 1/5 — Worked for months but suddenly doesn’t work anymore *2020-03-28, version 1.0.4* I hadn’t had any issues with the lamp since receiving it months ago. It connected and the app worked perfectly! Recently, my lamp hasn’t shown up as connected on the app, and I cannot reconnect it. When I try to register the lamp again, the app crashes. It still works by tapping on the lamp, but that’s really inconvenient and you can only cycle through the pre-set colors. The app is basically useless and just taking up storage space on my phone now. ### 1/5 — Still crashes *2020-03-27, version 1.0.4* App still crashes with iOS 13.3 can not connect lamp to the app ### 1/5 — Continually crashing *2020-03-26, version 1.0.4* Like many other reviewers, I’ve had this lamp for months. Now all of a sudden my lamp is deregistered and any attempt to register it again crashes the app. The basic colors controlled by tapping still work, but without registering it and having the Bluetooth connection, I can’t switch to any of the themes or dim the light enough to use when sleeping. This is absurd and needs to be fixed. ### 1/5 — Crashing *2020-03-26, version 1.0.4* App does not work when registering lamp. ### 1/5 — Crashing after ios13 *2020-01-22, version 1.0.3* Just like the previous reviews say, my lamp keeps un registering and when i try to register again, it crashes! This was workint fine for a few days but now i cant make it work im so sad please fix this quickly ### 1/5 — Crashes *2020-01-21, version 1.0.3* Won’t let me register my lamp it crashes when you attempt to register the lamp just a waste of money at this point hopefully they fix it ### 1/5 — Registration crash *2020-01-20, version 1.0.3* I had this lamp for months and it was fine until today. My lamp was randomly unregistered and every attempt to re-register it makes the app crash. Please update this, I’m very disappointed. ### 1/5 — Great lamp, terrible app *2019-10-09, version 1.0.2* I had all of three days after purchasing this lamp to use the app with it. Any time after that it crashes when I try to do anything. I uninstalled and reinstalled, only to have it crash when I try to even register the lamp. It’s a shame, because the lamp is great but I’m only able to use it to a fraction of its ability. Please fix this! ## Most praised reviews (10 highest-rated) ### 5/5 — Problems *2020-12-04, version 1.0.4* The app used to work so well but recently I changed phones and now when even I wanna use the app I can’t because I have to input my lamp’s code, but I forgot... edit: the code for all lamps is “123456” if anyone is having trouble :) ### 5/5 — ADORBSSS *2020-11-01, version 1.0.4* ABSOLUTELY AMAZING AND ADORABLE! This is so adorable not only because it’s bt21 but I just love how it’s made. Yeah the game crashes a few times but not a lot like these other people say. It all depends on your device I promise! It’s such a good game though! 감사합니다!! 💜 ### 5/5 — App Fixed *2019-10-15, version 1.0.3* Thank you for fixing the app, it works perfectly now! ### 3/5 — It does what you need. *2021-01-19, version 1.0.4* It’s a good app since it’s only to control the lamp but I’d appreciate if it’s updated to include a widget, so I can at least turn it on and off without opening the whole app. Also, the alarm thing needs tweaking! ### 3/5 — Lamp Unregistered *2020-03-27, version 1.0.4* It keeps crashing and my lamp is unregistered :( I need it to work again for me ### 3/5 — Could use some improvements *2019-10-09, version 1.0.2* My only suggestion is to give users an option to make custom patterns instead of just choosing from the 3 presets (aurora, rainbow and psyche). I think it would make the lamp more enjoyable if we were able to make our own color and transition speed combinations — would love to set the lamp in the BTS Love Yourself: Answer album colors. I haven’t updated my phone to iOS 13 so the app hasn’t crashed for me and is working fine for now... although I am more hesitant to update my phone now if the app isn’t going to work anymore judging from the other reviews... ### 2/5 — Worked for a while then randomly stopped *2022-09-15, version 1.0.4* It worked for a while then it stopped out of no where I try to adjust the light and change the color but all it says is smart lamp not found and I tried deleting the app and I can’t register it such a shame I liked the app to. ### 2/5 — App issues make lamp useless *2020-06-18, version 1.0.4* I haven’t used the lamp in months and now it’s telling me that I need to connect using the code for the lamp. I had to throw out the box and booklet after they got destroyed. But the lamp should have been fully registered. I know I have a new phone since I last used it but this is insane. I can’t so much as even change the color on it unless I unplug it and plug it back in hoping it auto changes to something else!!! ### 2/5 — Not working...again. *2020-05-29, version 1.0.4* Hi, the app randomly started not finding my lap anymore. I’ve been trying to connect it for a few days now and I’m not sure what’s wrong bc is everything is connected. Thanks! ### 2/5 — The same as jognac 😩 *2019-10-02, version 1.0.2* Yeah ever since I’ve updated to ios 13 the app crashes every time I try connecting my lamp. Please fix 🥺💔 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*