Preparedness guidance, technical evidence, and field notes.
Guides and publications on disaster preparation, using the app and security.
Our reference guides
Preparation
Fifteen minutes before a disaster: build your family communication plan
Choose a contact, define two meeting places, and run one short communication test without internet access.
Offline communication in earthquake response
See the gap nearby communication can fill when networks fail, and the limits that still apply.
Using the app
Why offline-first communication is more than ‘messaging without internet’
Explore how online, local, and secure layers work together—and where Bluetooth and operating systems set limits.
Get ready in five minutes
Grant the right permissions, add trusted contacts, and send one test message with internet access disabled.
Technology and security
Mobile technical architecture
Bluetooth transport paths, end-to-end encryption, trust bootstrap, and controlled expansion layers.
Trust Center
Data practices, security posture, open-source evidence, and direct verification links.
Tests and technical evidence
Three documented Android tests from March 2026. Each includes the tested build, conditions and limits; the whitepaper is a historical technical reference.
Edition date: · v2.0.0
Historical tests, with a defined scope
These developer-run tests were recorded on March 15, 2026 using Android 0.9.9-debug. They describe the listed devices and conditions. They do not validate today's Android or iOS store releases, establish independent certification, or guarantee performance during a disaster.
External publications and independent coverage
Articles and independent reporting about Crisis Connect and the offline-first communication approach.
İnternetsiz Afet İletişimi: Türk Liseli Geliştiriciden Bluetooth Tabanlı Uygulama Crisis Connect!
Ender Öztürk’s report on Crisis Connect, its creator and the limits of nearby disaster communication.
Crisis Connect — Open-Source Offline Emergency Communication
A resource submitted by Emirhan Duman describing the open-source project on PrepareCenter.
Crisis Connect: Teen Developer Launches Offline Disaster Communication App
Ender Öztürk’s English-language coverage of Crisis Connect on ShiftDelete.Net’s Global edition.
Why Emergency Communication Plans Need an Offline-First Fallback Layer
Emirhan Duman’s article on an offline-first fallback layer for emergency communication plans, drawing on his experience developing Crisis Connect.
Vol. 43, No. 9 · September 2026 · pp. 19–21. Full issue available to IAEM members; link opens the official Bulletin page.
Our publishing standard
Disaster communication depends on trust. Every new long-form resource will make the following information visible.
- Author, publication date, and last-updated date
- Primary sources and verifiable links
- A clear distinction between product capability and real-world limits
- A clear warning that Crisis Connect does not replace official emergency services