khazan
Bluetooth chat and SOS for places with no signal
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khazan is a chat app that needs no SIM, no Wi-Fi and no account. Phones relay for each other over Bluetooth, so a message crosses a work site by hopping from phone to phone until it arrives. If one phone in the chain still has internet, the message continues out to a supervisor far away. One tap on SOS raises a loud alarm on every phone in range. Messages are end-to-end encrypted and never stored on a server, because there isn't one. Built for workers who lose signal: tanks, basements, tunnels.
PH · launched Sep 15, 2026 · 1 upvote (top 69%) · 0 views
Niche: private and secure messaging apps · 144 launches, 10 in the last 7 days ▼ -41% · Explore this niche →
Category and tags
- Horizontal
- Communication
- B2C
- Not AI
- Commercial product
- Android
- Messaging
- Privacy
Visit website ↗ Source listing ↗
More like this: all 144 launches in private and secure messaging apps →
Could you build this?
No Implementing a reliable, multi-hop Bluetooth mesh network for off-grid message routing requires deep embedded/mobile wireless protocol engineering and low-level OS radio management.
What it would actually take: This requires native iOS and Android development utilizing Bluetooth Low Energy (BLE) peripheral/central roles or Wi-Fi Direct. The core difficulty is building an ad-hoc opportunistic mesh routing algorithm (similar to B.A.T.M.A.N. or epidemic routing) that survives mobile background task constraints, aggressive OS battery optimizations, payload fragmentation, and decentralized encryption without a central authority. Deep mobile systems programming and wireless mesh protocol expertise are essential.
Competitors
Other products that read as similar to this one : 209 launches clear the similarity bar, closest 8 shown.
Attention rank: #169 of 210 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 209 days after the earliest competitor.
- BeeChat: Offline Messenger · ph · 2026-11-08 · 1 upvotes · similarity 0.50
- Blue Chat - Chat Nearby No Net · ph · 2026-11-06 · 1 upvotes · similarity 0.48
- Whaat · ph · 2026-09-17 · 2 upvotes · similarity 0.43
- No Internet Messenger · ph · 2026-10-27 · 3 upvotes · similarity 0.41
- UYWNI · ph · 2026-11-08 · 1 upvotes · similarity 0.41
- witchat · ph · 2026-10-25 · 1 upvotes · similarity 0.41
- CheckOk · ph · 2026-10-06 · 1 upvotes · similarity 0.41
- Nelos · ph · 2026-09-23 · 1 upvotes · similarity 0.40
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