HotSummer — Heat safety app for Android

Heat warnings already exist — bulletins, municipal ordinances, red alerts. The problem isn't the information, it's that it stays too generic to act on.

HotSummer takes the same data (perceived temperature, humidity) and turns it into next-hour guidance, tuned to you:

• a personal risk index (4 levels, adjustable with an optional health profile)
• a recommended time window to stay outside
• adaptive hydration reminders
• a three-step alert when risk worsens (notification, short sound + vibration, actionable pop-up)
• the nearest park/green area with directions
• three ways to pick a location (GPS, search, or a point on the map)
• a quick-reference heatstroke first-aid card

No account, no ads, no data leaving your phone beyond the weather/map requests needed to work (Open-Meteo and OpenStreetMap, both keyless and trackerless).

Not a substitute for medical advice or official heat bulletins — it complements them.

What you get:

• One-time purchase, lifetime use (no subscription, ever)
• Personal heat-risk index with next-hour guidance, tuned to you
• Smart alerts and adaptive hydration reminders
• Nearest park or green area with directions, plus a heatstroke first-aid card
• No account, no ads, no tracking

How to install & activate:

1. Buy: pay once, by card or PayPal. No account needed.
2. Download: after payment you get an email with the APK download link and your license key. No email? Check your spam folder.
3. Install: open the APK on your phone. If asked, tap Settings and turn on "Allow from this source" (menu names may vary by phone).
4. Activate: open the app and enter the license key on first launch. Activation needs internet. 3 activations are included for reinstalls.

Requirements:

Android 7.0 or later, with an internet connection for weather and map data and to activate the license (GPS optional).

Refunds: You have a right of withdrawal within 14 days of purchase, with no reason needed and even if you have already used the app. Details: https://survival-apps.com/en/refunds/

Part of the Survival Apps family of independent, privacy-first tools — built by one developer, not a company.

Verify this file before installing

File:    HotSummer-v1.2.1-release.apk

SHA-256:   af51c5e76c7ff20c1e73c21cc310eb4ff5cdfd39a82cd1374be4002b38137d5e

VirusTotal: VirusTotal Scan

Run "sha256sum HotSummer-v1.2.1-release.apk" (Linux/Android) or

"Get-FileHash HotSummer-v1.2.1-release.apk -Algorithm SHA256" (Windows).

If the result matches the hash above, the file is untouched.

Step-by-step guide: https://survival-apps.com/en/transmissions/021-verify-apk-before-installing/

More info and screenshots: https://survival-apps.github.io/