Free on iOS — Coming Soon

Works when
nothing else does.

Your AI survival expert. No signal required.
Verified survival knowledge from military and emergency sources — all on your iPhone.

Get Launch Updates See Features ↓
100% Offline
Verified Sources
Zero Data Collection
5:15
No Signal ● Ready

Hey. I'm here
if you need me.

What's going on?

✦ I'm lost outdoors
⊕ Someone's hurt
◦ Need water
◎ I don't know what to do
Ask anything
Your other apps? Useless without signal. No Signal was built for exactly that moment.
Core Features

Everything you need.
Nothing you don't.

Essential survival intelligence. All working offline. All on your iPhone.

Offline AI Q&A

Ask survival questions in plain English. Get verified, sourced answers instantly — no internet needed. Powered by on-device AI with retrieval-augmented generation over authoritative survival manuals.

On-Device LLM RAG Pipeline Natural Language

Verified Knowledge & Sources

Every answer cites its source. US Army survival manuals, FEMA emergency guides, WHO medical protocols, Red Cross first aid. No hallucinations. No guessing. Just verified, life-saving information.

US Army FM 21-76 FEMA WHO Red Cross
Real Scenarios

When it matters most,
No Signal has answers.

Real situations. Verified responses. No internet required.

🐍
"I think this snake bit me"
Immediate first aid from military and WHO snakebite protocols. What to do, what NOT to do, and how to identify symptoms of envenomation.
US Army FM 21-76 · WHO Snakebite Guidelines
🌿
"Is this plant safe to eat?"
Cross-referenced plant identification and edibility data. Universal Edibility Test procedure. Known toxic look-alikes flagged.
US Army Survival Manual, Ch. 9
🏔️
"How do I build shelter with just a tarp?"
Step-by-step shelter configurations based on your materials, weather conditions, and terrain. Diagrams and knot instructions included.
US Army FM 21-76, Ch. 5
📡
"Cell towers are down after the earthquake"
Post-quake survival when networks are congested or destroyed. Structural safety assessment, gas leak detection, water purification from damaged pipes, signaling rescuers without comms, and managing injuries when 911 won't connect.
FEMA · Red Cross Disaster Response
🔦
"Major power outage — no comms"
Grid-down protocols: preserve phone battery, find potable water, food safety without refrigeration, neighborhood coordination signals, and when to shelter vs. evacuate.
FEMA · Red Cross Emergency Preparedness
🌊
"Flood aftermath — networks overloaded"
Post-disaster survival when everyone's trying to call at once. Water contamination risks, safe movement through flooded areas, improvised flotation, and finding higher ground.
FEMA · US Army FM 21-76
Trusted Sources

No hallucinations.
Only verified answers.

Every response in No Signal is grounded in authoritative survival and emergency sources. When your life might depend on it, "I think..." isn't good enough.

🎖️
US Army Survival Manual FM 21-76 — The gold standard
🏛️
FEMA Guidelines Official disaster response protocols
🌐
WHO Protocols World Health Organization standards
🏥
Red Cross First aid and emergency care

Your Privacy, Guaranteed

  • 100% offline — no servers, no API calls
  • Zero data collection, ever
  • Works in airplane mode
  • No account required
Pricing

Free. No catch.

No subscriptions. No in-app purchases. No ads.
Survival knowledge should be accessible to everyone.

Free on the App Store
FAQ

Questions? Answers.

How does it work without internet?

No Signal runs a compact AI model directly on your iPhone — no server connection needed. The survival knowledge base is stored locally on your device, and the AI retrieves relevant information using a technique called RAG (Retrieval-Augmented Generation). Everything runs on-device, so it works in airplane mode, deep in the wilderness, or during a disaster when networks are down.

How accurate is the survival information?

Every answer is sourced from authoritative references: the US Army Survival Manual (FM 21-76), FEMA emergency guidelines, WHO medical protocols, and Red Cross first aid procedures. The AI doesn't generate creative answers — it retrieves and presents verified information, always with source citations so you can trust what you're reading.

How much storage does it need?

The core app with AI model and knowledge base requires approximately 2-3 GB. This includes the on-device language model and the full indexed survival knowledge base.

What iPhone models are supported?

No Signal requires iPhone 12 or later running iOS 17+. The on-device AI model needs the Neural Engine found in A14 Bionic chips and newer to run efficiently. Newer models will provide faster response times.

Will there be an Android version?

We're focused on making the best possible iOS experience first. Android is on our roadmap, but we don't have a timeline yet. Sign up for updates and we'll let you know when it's in development.

Is my data private?

Completely. No Signal never connects to the internet during use. There are no analytics, no tracking, no accounts, and no data collection of any kind. Your questions and usage never leave your device. We literally can't see what you do with the app — and that's by design.

Why is it free?

We believe survival knowledge should be accessible to everyone. No Signal has no servers to maintain, no API costs, and no ongoing expenses — everything runs on your device. So we made it free. No ads, no subscriptions, no in-app purchases. Just download it and go.