Piloting in Lisbon • Launching 2026
The best path
isn't the fastest.
It's the safest.
GreenRah is the world's first thermal-aware routing engine that guides you through the coolest, most accessible walking paths, fusing real-time weather, solar position, 3D building shadows, and elevation data into one smart path.
The Crisis
Heat kills.
Maps don't see it.
Every summer in Lisbon, people suffer, not from disease or accidents, but simply by walking. Portugal ranks 6th in Europe for heat-related deaths. The streets we walk every day are at the center of this silent crisis.
+300%
Heat Deaths Are Surging
Heat-related fatalities spike 300% during heatwaves. By 2050, Lisbon will endure over 50 days above 35°C every single year, and urban heat islands can add 5–10°C on top of that.
Heat-blind
Navigation Tools Ignore Heat
Google Maps, Apple Maps, Waze, every dominant navigation tool optimizes for speed alone. They send you into full sun at midday, up steep inclines, with zero awareness of thermal risk or physical effort.
105K+
Vulnerable Populations Left Behind
Over 105,000 seniors, 60,000 people with disabilities, 20,000 parents with strollers, and 6.5 million tourists walk Lisbon's streets every year, none of them protected by existing navigation apps.
How It Works
Five data layers.
One safe route.
GreenRah isn't just a map, it's a thermal-aware routing engine.
It doesn't just ask "how fast can you get there?"
It asks: "how safely can you walk there?"
And it answers with science.
Real-Time Weather
Live temperature, UV & humidity via IPMA Open Data API
Elevation Data
Avoids steep streets for safer, accessible routes via Open-Meteo
Solar Algorithms
Predicts shade and heat changes throughout the day in real-time
3D Building Models
Uses buildings & solar position to calculate actual shadow coverage
Walkability Graph
Full walkable graph of Lisbon via OpenStreetMap & OSMnx
Coolest Path vs. Fastest Path
Users see both options side by side, shade percentage, steep hill count, estimated heat exposure, and choose their comfort level. Same city. Safer walk.
Personalised Health Profiles
Premium users set a health profile, senior, runner, tourist, stroller, disability, and GreenRah adapts route scoring to their specific mobility and thermal sensitivity needs.
Well-Being Points of Interest
Water fountains, public WCs, shaded rest spots, and UV alert zones are layered onto routes, ensuring vulnerable users have what they need along the way.
City Dashboard for Municipalities
GreenRah's B2G platform delivers heat corridor intelligence, evidence-based data to optimize €M climate budgets and plan urban cooling interventions at city scale.
Live Shade
Comfort changes.
Your path should too.
GreenRah reads how sun and shade move through the city, then turns that changing information into a route that is easier to follow and more comfortable to walk.
Route in shade: 95%Route in shade
UV high · 14:00
Shaded corridor
Low effort
Why GreenRah
No one else does
all of this.
Every competitor solves a fragment of the problem. GreenRah is the only solution that combines them all, built specifically for hot, hilly cities like Lisbon.
| Tool | Heat-Aware Routing | Turn-by-Turn | Slope & Accessibility | Lisbon-Ready |
|---|---|---|---|---|
| Google Maps | ✗ | ✓ | ✗ | ✓ |
| Shadow Map | ✓ | ✗ | ✗ | ✓ |
| Cool Walks | ✓ | ✓ | ✗ | ✗ |
| Komoot | ✗ | ✓ | ✓ | ✗ |
| ✦ GreenRah | ✓ | ✓ | ✓ | ✓ |
Roadmap
Where we are and
what's coming next.
Execution is staged and realistic. From Lisbon pilot to European city platform, every phase is built on measurable milestones and validated user traction.
Stage 1, Now (Months 1–3)
MVP & Pilot Launch
Shade routing, slope avoidance, and side-by-side route comparison UI go live. 200 pilot users at NOVA IMS validate the core experience and thermal routing accuracy.
In ProgressStage 2, Growth (Months 4–6)
Well-Being & Vulnerable Populations
Water fountains, WC locations, and UV alerts added to the layers. Partnerships with elderly associations and outdoor worker unions. Premium subscription (health profile and habits).
Coming SoonStage 3, Scale (Months 7–12)
City Platform & Mass Market
Full city dashboard with UTCI heat corridor scoring for municipal planners. B2G contract with city municipalities in Portugal. Then, Barcelona, Rome, Paris...
Europe is the vision Get In Touch
Invest in safer cities.
Whether you're an investor, a municipality, an early adopter, or a media partner, we want to hear from you. GreenRah is looking for partners who believe that data should protect lives, not just optimize them.
HQ: Coimbra, Portugal