Leading Japan's podcast advertising market

Building the future of podcasting
in Japan, together.

The podcast market the world is watching.
We're building the foundation for its growth in Japan.

Robot Start in 90 seconds
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400+
Partner podcast shows
50M+
Monthly plays
100+
Sales partners
25+ yrs
Of internet advertising experience

Now is the moment Japan's
podcast market takes off.

In the US, podcasting has been one of the fastest-growing advertising markets for years. Japan is still at the starting line — which is exactly why now is the opportunity.

🇺🇸
United States: Rapid growth
$2.5B

Annual podcast ad market size (2026)

Ad market growth rate +25% / yr
Monthly listeners (US adults) 58%

Just like YouTube, Instagram, and TikTok, advertising is the foundation that makes high-quality content free to enjoy.

🇯🇵
Japan: Untapped growth, underbuilt infrastructure
×100+

Estimated market-size gap vs. the US

Ad infrastructure readiness 12%
Podcasters who are monetizing Under 5%

Growth is held back because the infrastructure isn't there yet —— and we are exactly the company built to solve that.

The future we're building,
by people who've been running
since the dawn of the internet

👤
The Robot Start core team
A quarter-century of veterans, in internet advertising since the late 1990s

Our members have worked in internet advertising for over a quarter of a century, since the dawn of the internet in the late 1990s.

We may be a little old-school, but we genuinely love the idea of an internet where great information is freely accessible — and we want to keep building it.

YouTube, Instagram, TikTok —— this vision is made possible because advertising sits at its foundation. We're bringing that same model to podcasting.

The real market growth is still ahead. We sincerely want to build the future of podcasting together with you.

Get in touch
🌐
Late 1990s
At Yahoo! and Overture, helped launch and drive the growth of the online advertising market from the earliest days of the internet.
📱
2000s – 2010s
Anticipating the rise of mobile internet access, founded a first company to launch the mobile advertising market. After its sale to the GMO Group, held senior roles within the group while exploring new advertising frontiers.
🚀
2014 — Robot Start founded
After researching overseas markets, focused on audio advertising and founded a second company. As the team came together, narrowed its focus to podcasting in 2022 and began building advertising infrastructure.
📡
Today & beyond
Built a network of 400+ shows and over 100 sales partners, reaching more than 50 million monthly plays. The real market growth is still ahead.

Three pillars supporting
the podcast market

📡

Audiostart
Podcast Ad Network

We give 400+ creators new opportunities to earn, and offer advertisers audio ad packages that reach the right audiences — building an ecosystem where podcasters, advertisers, and listeners all win.

📻

Media Show Network
(major radio & TV broadcasters)

Partnering with major radio, TV, and other leading media, we bring high-quality podcast shows into our advertising network. By leveraging trusted, established media brands, we offer advertisers premium ad inventory.

🤖

Audio Data
for AI Training

We license the diverse audio data gathered across our podcast network to AI developers — supporting next-generation AI in speech recognition, synthesis, emotion analysis, translation, and more.

A vast network
that moves the industry

From radio and TV broadcasters to independent podcasters. The numbers tell the story of the trust we've built.

400+
Partner podcast shows Broad partnerships across radio, TV, and independent podcasters
50M+
Monthly plays Monthly plays across the entire network — proof of the reach we offer advertisers
100+
Sales partners A network centered on ad agencies that maximizes our reach to advertisers

Why podcasting,
why now

🌐

An ad ecosystem that keeps content free

YouTube, Instagram, and TikTok are all free to enjoy because of advertising. We want the same world for podcasting — one where everyone can access great information.

📈

One of the world's fastest-growing ad markets

In the US, podcast advertising has been one of the fastest-growing media for years. Japan's market is still in its infancy, leaving room for a decisive first-mover advantage.

🎧

"While you do something else" — a unique ad touchpoint

Audio reaches listeners while they drive, exercise, or do chores. Unlike media fighting over screen time, it blends naturally into everyday life.

🤝

High-trust host-read advertising

Host-read ads, delivered in the podcaster's own words, drive high engagement built on listener trust — and earn strong marks from advertisers.

News

2026.04.28 Case Study
Kochi-born denim brand "isa" boosts young-customer store visits and e-commerce sales through podcast advertising
2026.02.03 Partnership
Bringing a "voice" DX to political communications: Capitol Think partners with Robot Start to launch podcast political advertising for younger and business audiences
2026.01.06 Milestone
Monthly payouts to podcasters across the network surpass ¥5 million
2024.03.26 Partnership
Robot Start Inc. and production-support company PitPa announce a joint package — end-to-end support from podcast production through to audience growth

Want to build the future
of podcasting with us?

If you're even a little interested, please don't hesitate to reach out. We're actively hiring.

New Service Planning
Full-time · Tokyo
Ad Sales / Account Manager
Full-time · Tokyo
Podcaster Relations
Full-time · Tokyo / Remote

Let's talk about the future
of podcasting, together.

Whether it's about our business, investment, or careers ——
feel free to reach out about anything.