Knowing the heat is free. Always.
Every reading, every warning and every piece of guidance on this site is free and stays free. What you pay for is depth, history, and documents you can hand to somebody else.
Subscriptions open shortly. Everything listed under Free works right now, with no account.
Free
$0
Forever. Not a trial.
- Live heat-stress readings anywhere on Earth
- Plain-language guidance and safety warnings
- Sun and shade, pavement and paw safety
- “Safe for me” personal risk
- City guides and the live map
- Viewing any report someone shares with you
- One saved place, one heat alert
Plus
$1.99/mo
$23.88 billed yearly, saves $24
- Unlimited saved places and alerts
- Full historical time travel, not just the last week
- Custom date-range reports, unlimited
- No promo panel on anything you share
- Your saved report library
- Exposure insights over time
Pro
$299/yr
One site included
A site is a place you report on, not a person who logs in. Templates and documents over the sites you hold are unlimited.
- Everything in Plus
- Studio: build a report once, re-run it any time
- Multi-site documents and cross-site summaries
- Your logo and organization name on every page
- The Heat Log: what was recorded, when, and by which method
- Full CSV export of every hour and every metric
What we will never put behind a payment
This is not a marketing promise we can quietly walk back. The list below is a constant in our source code, and a test fails the build if anything is removed from it. Someone in danger from heat should never meet a paywall, and neither should the person they sent the reading to.
- Current readings, anywhere
- Guidance and safety warnings
- State athletic-policy tables
- Pavement and paw safety
- Your personal risk profile
- City guides
- Viewing a report someone shared
- Logging your own exposure
- Preset reports
9 capabilities, free at every tier including no account at all. Viewing a shared report never asks anyone to sign in.
How Pro is priced
$299 a year includes one site. Each additional site is $49 a year. A site is a place you report on: a field, a yard, a campus, not a person who logs in, and not a document. Templates, runs and exports over the sites you hold are unlimited.
A twelve-school district: $299 + 11 × $49 = $838 a year.
The fine print, up front
Cancel yourself, any time. Cancelling is a button in your account, not an email to us. You keep what you paid for until the end of the period you already bought.
What Pro documents are, and are not. Pro produces a dated, sourced record of what the conditions were and how they were computed, something an organization’s own record-keeping can cite. It is not a substitute for an on-site instrument where a standard, contract or policy requires a measured reading, and it does not certify that anyone has met any obligation.
Our numbers are modeled. WBGT is computed from gridded weather by the Liljegren (2008) method and corrected against measured stations. We publish how well it does, in public, on the live accuracy page.
Informational only. Not a guarantee of safety, and not a substitute for official heat warnings or medical advice. Always follow your local authorities and your weather service.