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Blotter
Police radio, mapped in real time
Blotter records 6 LAPD and LASD scanner feeds 24/7, transcribes them with Whisper on a GPU, extracts locations and police codes, and plots each event on a map. The whole pipeline runs in about 5 minutes from dispatch to map pin. Tap any dot to read the transcript and play back the original audio. Search by keyword, time range, or police code. Covers all of LA County. Free, no account needed.
Top comment
I got into listening to police scanners a while back. The Broadcastify app is great for live audio, but if you missed something, it's gone. And there's no way to see where things are happening on a map. So I built Blotter. It records 6 LAPD and LASD feeds around the clock, transcribes everything with Whisper, and tries to figure out where each dispatch is referring to. When it finds a location, it drops a pin on the map. The geocoding was the hard part. Dispatchers say things like "responding to Vernon and Central" and you need to know that's an intersection in South LA, not a person named Vernon. I went through a lot of iterations on the NLP before it stopped putting pins in random places. It all runs on one rented GPU. Poke around the map. If you spot a pin that's obviously wrong, let me know.
About Blotter on Product Hunt
“Police radio, mapped in real time”
Blotter was submitted on Product Hunt and earned 1 upvotes and 1 comments, placing #134 on the daily leaderboard. Blotter records 6 LAPD and LASD scanner feeds 24/7, transcribes them with Whisper on a GPU, extracts locations and police codes, and plots each event on a map. The whole pipeline runs in about 5 minutes from dispatch to map pin. Tap any dot to read the transcript and play back the original audio. Search by keyword, time range, or police code. Covers all of LA County. Free, no account needed.
On the analytics side, Blotter competes within Open Source, GitHub, Maps and Radio — topics that collectively have 122.7k followers on Product Hunt. The dashboard above tracks how Blotter performed against the three products that launched closest to it on the same day.
Who hunted Blotter?
Blotter was hunted by Sean Reid. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Blotter including community comment highlights and product details, visit the product overview.