990
Students
Students taught and mentored globally
Applications for Autumn 2026 are open
Build the world you want to live in.
Youth Entrepreneurship Programs
Youth Entrepreneurship Programs
Stella
Global entrepreneurship program for ambitious teens
Stella
Global entrepreneurship program for ambitious teens
Guillaume Catella
Founder
Stella gives you the methodology and the mentors to take a real idea from concept to working prototypes and early revenues, guided by founders who have built and scaled ventures across four continents, and mentors from the world's leading universities and companies.
Reviews
0
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-1
Loved by students, trusted by parents
0
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-1
Loved by students, trusted by parents
0
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0
Loved by students, trusted by parents
Mentors
50
50
50
Learn from founders who've built real companies.
Learn from Real Founders
Age
Self-motivated teenagers aged 14–17
14-17
14-17
Self-motivated teenagers aged 14–17
Self-motivated teenagers aged 14–17
14-17
Mentors From
Mentors From
Mentors From
Stella team brings together alumni and faculty from Harvard, INSEAD, Wharton, Oxford, Cambridge, and ESSEC, alongside professionals who have worked at the UN, Google, Apple, Microsoft, Amazon, Meta and TikTok.
Stella team brings together alumni and faculty from Harvard, INSEAD, Wharton, Oxford, Cambridge, and ESSEC, alongside professionals who have worked at the UN, Google, Apple, Microsoft, Amazon, Meta and TikTok.
INSEAD
INSEAD
INSEAD
Wharton
Wharton
Wharton
Harvard
Harvard
Harvard
Cambridge
Cambridge
Cambridge
ESSEC
ESSEC
ESSEC
Apple
Apple
Apple
Amazon
Amazon
Amazon
Meta
Meta
Meta
TikTok
TikTok
TikTok
How it works
How it works
How it works
Apply
01/
Review
02/
Our team will review all applications and contact successful applicants.
Enroll
03/
Complete enrollment with your parents and lock in your spot.
Cohort
04/
Connect with ambitious students worldwide. Introduce yourself, meet mentors, join the community.
Key Numbers
10
Mentors
Mentors and speakers from the world's leading institutions
50
Millions Raised
Raised by portfolio companies
150
Startups
Startups accelerated
Our Programs
Our Programs
Our Programs
Stella Spark 2026
Stella Spark 2026
$
1,995
$
1,995
2-week intensive online program designed for ambitious high school students
Guides students from their first concept to a functional startup prototype
Students attend 1–2 mentor calls per week with real-world practitioners
Tournament-style Demo Day
2-week intensive online program designed for ambitious high school students
Guides students from their first concept to a functional startup prototype
Students attend 1–2 mentor calls per week with real-world practitioners
Tournament-style Demo Day
2-week intensive online program designed for ambitious high school students
Guides students from their first concept to a functional startup prototype
Students attend 1–2 mentor calls per week with real-world practitioners
Tournament-style Demo Day
/01
/01
Duration:
Duration:
2 weeks
2 weeks
Stella Build Online 2027
Stella Build Online 2027
5-week intensive online program focused on venture building
Students work in teams of 4–5
Teams receive one dedicated coaching meeting with a Stella instructor every week
Final requirement is a 3-minute live team pitch followed by a professional Q&A
5-week intensive online program focused on venture building
Students work in teams of 4–5
Teams receive one dedicated coaching meeting with a Stella instructor every week
Final requirement is a 3-minute live team pitch followed by a professional Q&A
/02
/02
Duration:
Duration:
5 Weeks
5 Weeks
$
4,995
$
4,995
Stella Build In-Person 2027
Stella Build In-Person 2027
$
9,995
$
9,995
5-week immersive program held in either France or the United Kingdom
The most rigorous format, requiring approximately 6 hours of daily commitment
Designed for students to "meet their tribe" of ambitious peers in a physical setting
Concludes with a live team pitching event in front of a panel of judges
5-week immersive program held in either France or the United Kingdom
The most rigorous format, requiring approximately 6 hours of daily commitment
Designed for students to "meet their tribe" of ambitious peers in a physical setting
Concludes with a live team pitching event in front of a panel of judges
5-week immersive program held in either France or the United Kingdom
The most rigorous format, requiring approximately 6 hours of daily commitment
Designed for students to "meet their tribe" of ambitious peers in a physical setting
Concludes with a live team pitching event in front of a panel of judges
/03
/03
Duration:
Duration:
5 Weeks
5 Weeks
What They're Saying
What They're Saying
What They're Saying
based on 300+ reviews
9.2/10
Arsenii
Online Program 2025
This experience gave me invaluable knowledge and inspiration. Many ideas became clearer, and my perspective on business grew deeper and more confident.
Anahita
Online Program 2023
The guidance was instrumental in overcoming challenges and growing both professionally and in working with a team. The mentorship had a lasting positive impact on my aspirations
Nil
Online Program 2024
I had a really amazing experience, with a different perspective on our problems and a positive environment throughout. I see M. Catella as a role model and mentor who changed my mindset for the better, helping me understand the process of youth entrepreneurship.
Siri, EQUO International
Vietnam Program
One of the most unforgettable experiences in work and life ever! We received detailed feedback from experienced mentors and judges, and felt strongly supported by the organizers and inspired at every stage of the program.
Oliver Bennet
Founder, Lune Skincare
Working with Astra was a game-changer for our brand. They didn’t just redesign our logo — they helped us rethink our entire identity.
Isabelle Montgomery
Brand Manager, Housemood
What I loved most about Astra was how deeply they listened. They brought our vision to life in a way that felt both original and totally aligned with who we are.
Viktoria Clark
CEO, Nimma
We've worked with a lot of creative agencies, but Astra feels like a true partner. They care about the outcome as much as we do.
Phoenix Wilder
Co-founder, LEXX
After our rebrand with Astra, we saw a measurable boost in engagement and credibility. Their team is equal parts creative and strategic — a rare combination.
Previous
Next
Arsenii
Online Program 2025
This experience gave me invaluable knowledge and inspiration. Many ideas became clearer, and my perspective on business grew deeper and more confident.
Anahita
Online Program 2023
The guidance was instrumental in overcoming challenges and growing both professionally and in working with a team. The mentorship had a lasting positive impact on my aspirations
Nil
Online Program 2024
I had a really amazing experience, with a different perspective on our problems and a positive environment throughout. I see M. Catella as a role model and mentor who changed my mindset for the better, helping me understand the process of youth entrepreneurship.
Siri, EQUO International
Vietnam Program
One of the most unforgettable experiences in work and life ever! We received detailed feedback from experienced mentors and judges, and felt strongly supported by the organizers and inspired at every stage of the program.
Oliver Bennet
Founder, Lune Skincare
Working with Astra was a game-changer for our brand. They didn’t just redesign our logo — they helped us rethink our entire identity.
Isabelle Montgomery
Brand Manager, Housemood
What I loved most about Astra was how deeply they listened. They brought our vision to life in a way that felt both original and totally aligned with who we are.
Viktoria Clark
CEO, Nimma
We've worked with a lot of creative agencies, but Astra feels like a true partner. They care about the outcome as much as we do.
Phoenix Wilder
Co-founder, LEXX
After our rebrand with Astra, we saw a measurable boost in engagement and credibility. Their team is equal parts creative and strategic — a rare combination.
Previous
Next
Arsenii
Online Program 2025
This experience gave me invaluable knowledge and inspiration. Many ideas became clearer, and my perspective on business grew deeper and more confident.
Anahita
Online Program 2023
The guidance was instrumental in overcoming challenges and growing both professionally and in working with a team. The mentorship had a lasting positive impact on my aspirations
Nil
Online Program 2024
I had a really amazing experience, with a different perspective on our problems and a positive environment throughout. I see M. Catella as a role model and mentor who changed my mindset for the better, helping me understand the process of youth entrepreneurship.
Siri, EQUO International
Vietnam Program
One of the most unforgettable experiences in work and life ever! We received detailed feedback from experienced mentors and judges, and felt strongly supported by the organizers and inspired at every stage of the program.
Oliver Bennet
Founder, Lune Skincare
Working with Astra was a game-changer for our brand. They didn’t just redesign our logo — they helped us rethink our entire identity.
Isabelle Montgomery
Brand Manager, Housemood
What I loved most about Astra was how deeply they listened. They brought our vision to life in a way that felt both original and totally aligned with who we are.
Viktoria Clark
CEO, Nimma
We've worked with a lot of creative agencies, but Astra feels like a true partner. They care about the outcome as much as we do.
Phoenix Wilder
Co-founder, LEXX
After our rebrand with Astra, we saw a measurable boost in engagement and credibility. Their team is equal parts creative and strategic — a rare combination.
Prev
Next
FAQ
FAQ
FAQ
Who is Stella for?
Stella is for ambitious, self-motivated teenagers aged 14–17 who want to move beyond theoretical learning to think and act like founders
What does a typical week look like?
Do students actually build something?
What language is the program taught in?
Who teaches the program?
What are the dates?
What is the application deadline?
How much does Stella cost?
Is there a certificate at the end? How to graduate?
What's the cohort size / student-to-instructor ratio?
Can students from any country apply?
How much time commitment is required?
Do students need to travel?
Does Stella provide financial aid?
Who is Stella for?
Stella is for ambitious, self-motivated teenagers aged 14–17 who want to move beyond theoretical learning to think and act like founders
What does a typical week look like?
Do students actually build something?
What language is the program taught in?
Who teaches the program?
What are the dates?
What is the application deadline?
How much does Stella cost?
Is there a certificate at the end? How to graduate?
What's the cohort size / student-to-instructor ratio?
Can students from any country apply?
How much time commitment is required?
Do students need to travel?
Does Stella provide financial aid?
Who is Stella for?
Stella is for ambitious, self-motivated teenagers aged 14–17 who want to move beyond theoretical learning to think and act like founders
What does a typical week look like?
Do students actually build something?
What language is the program taught in?
Who teaches the program?
What are the dates?
What is the application deadline?
How much does Stella cost?
Is there a certificate at the end? How to graduate?
What's the cohort size / student-to-instructor ratio?
Can students from any country apply?
How much time commitment is required?
Do students need to travel?
Does Stella provide financial aid?
Didn’t find the answer? Ask us about our services!
Didn’t find the answer? Ask us about our services!