SUSTAINABILITY ACTION

Bringing green to the world.

A climate-action platform that visualizes journeys by public transit, walking, and cycling as CO2 reductions — and returns that contribution to the planet as trees in the arearun Forest.

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The first step starts with your everyday life.

HOW IT WORKS

Just three simple steps.

Your everyday journeys become a contribution to the planet — no complicated setup required.

STEP 01

Check in

Just tap when you arrive at a station or stop. arearun finds the spot automatically from your location.

STEP 02

CO2, calculated automatically

Every trip is logged automatically as CO2 savings — your everyday actions become numbers, effortlessly.

STEP 03

It becomes a tree

Your accumulated savings turn into real trees planted in the arearun Forest, returning your action to the planet.

Seed

SEED

Sapling

SAPLING

Tree

TREE

Lv.3

62%

Example

YOUR TREE

Your tree grows with you.

The more you move, the more the tree on your screen grows — from a seed to a sapling, then to a full tree. Once it's fully grown, a real tree gets planted in the arearun Forest.

Your very own tree. Every small daily action comes back to you as visible growth.
Built to stick. Your level, and the distance to the next planting, quietly keep you going.
Rooted in reality. The tree growing on your screen mirrors real green growing on the planet.

OUR IMPACT

Small steps, adding up.

Launching soon — the first step starts with you.

CO2 Reduced

Trees Planted

Eco Trips

Community

* Every number here will grow from your own check-ins.

ROADMAP

From everyday life, to the world.

We're starting with a regional pilot, expanding the circle of green one step at a time.

PHASE 01

Regional pilot

Rooted in a single town, growing our first forest.

You are here

PHASE 02

Nationwide

Turning journeys across Japan into green.

FUTURE

The world, eventually

From yen to en — bringing green to the world.

PRICING

Free to start, always.

Start for free. Upgrade to Plus whenever you want more.

Free

Take your first step, casually.

¥0/mo

Free forever

Check-ins & automatic CO2 tracking
Grow your own tree
Monthly challenges
Detailed insights
Priority support

Get started free

Popular

Plus

For those who want to go deeper.

¥480/mo

Cancel anytime

Everything in Free
Detailed insights & annual summary certificate
Priority support
Faster tree-planting pace

Get Plus

Looking for a plan for your company or municipality? Contact us →

FAQ

Frequently asked questions

Is it free to use?

Yes. Check-ins, automatic CO2 tracking, and growing your own tree are all free. For deeper insights and extra perks, we also offer a Plus plan for ¥480/month.

Is my privacy protected? (How is location data used?)

Location is used only to identify check-in spots and calculate your CO2 savings — we never track you continuously. See our privacy policy for details.

Can I use it for my daily commute?

Absolutely — your daily commute or school run is exactly where arearun shines. Every trip by public transit, on foot, or by bike turns directly into CO2 savings and trees.

Which modes of transport count?

Public transit such as trains and buses, walking, and cycling all count. We automatically calculate your savings compared to driving.

Where is it available?

We're starting with a pilot in select regions and will expand nationwide over time. Stay tuned for arearun coming to your area.

Let's take the first step, together.

From yen to en. Your everyday journeys bring green to the world — starting today, starting with you.