Knocker

What it does

Knocker transforms traditional cellular-based building buzzers into a voice-activated access system. Create voice pins through our smartphone app to unlock your building entrance. No extra hardware is needed, offering a modern, secure solution.

• 
  Doorport2019 · ▲72

  Unlock your door using your smartphone

• 
  DoorBuzzing2015 · ▲86

  Turn your existing door buzzer into a smart device

• 
  Buzzcut2024 · protobuzz.com · ▲9

  The smart buzzer for apartments & condos

• 
  KnockKnock!Dec 2025 · apps.apple.com · ▲187

  Minimal circular video calls that start with a "door" knock

• 
  I built an app to use a QR code as my doorbell2024 · dingdongdoorbell.com · ▲140

  I didn’t have a doorbell before (multiple reasons) and my house feels unwelcoming without one. So I built a doorbell app that uses a QR code - visitors scan the QR code to ring the doorbell and I get notified on my phone. Here is an example of the QR code I have on my door. You can scan it and say hello: https://www.thebacklog.net/img/2024/10/show-hn.png This was also a great excuse to build my first app for Android and iPhone. I’d love to get some feedback before I spend more time polishing the app. Please try it out and feel free to ask me any questions! No…

• 
  KnockMar 2026 · tryknock.app · ▲168

  Knock-Knock.net is a live honeypot dashboard showing real-time bot attacks by protocol, source country, ISP, username, password, and IP across SSH, Telnet, FTP, RDP, SMB, SIP, HTTP, and SMTP services.

• 
  SimCity, but with Permits▲936

  A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.

  Life & fun · 3d ago · permit.petercai.com

• IV
  I've been paying for a rural Tanzanian's education for 10 years▲778

  Life & fun · 15d ago · tanzaniaeducationproject.org

• 
  Bigwords.page – Turn any screen into a sign. The URL is the app▲728

  Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.

  Life & fun · 16d ago · bigwords.page

• 
  Guitoro, a virtual guitar you strum with your keyboard▲573

  Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.

  Life & fun · 10d ago · guitoro.com

• 
  See *almost* any carriers phone settings▲432

  Carrier settings from iPhone, Pixel and Galaxy firmware, decoded and compared: APNs, VoLTE, 5G and Wi-Fi Calling per carrier, and what each build changed.

  Life & fun · 14d ago · carrierexplode.com

• 
  The whole Solar System and every tracked satellite, live in the browser▲407

  Life & fun · 24d ago · space.bl2.net

• 
  Sugar Free: Food Scanner▲2,107

  Sugar detox app

  AI · 2024 · apps.apple.com

• 
  Mobbin 2.0▲1,657

  Discover real-world design inspiration

  Work · 2024 · mobbin.com

• 
  folk 3.0▲1,591

  The CRM for companies who care about people

  Dev tools · 2024 · folk.app

• 
  SuperGPT▲1,206

  Use ChatGPT on Google Sheets

  AI · 2024 · superjoin.ai

• 
  I created an After Effects alternative▲1,150

  Many years ago, I made VJ softwares (to mix live visuals in clubs) for unexpected platforms like the Game Boy Advance, the Playstation 2 and the Raspberry Pi. This year, I’m back with a new web-app: Pikimov. Inspired by Photopea (a free Photoshop clone), I created this web-based motion design & video editor as an alternative to After Effects, to fill empty void. It's free, without signup, without cloud uploads (your files stay on your machine), and your projects are not used for AI models training.

  AI · 2024 · pikimov.com

• 
  Motiff▲1,147

  AI powered professional UI design tool

  AI · 2024 · motiff.com