Yesterday, we officially launched Giselle, the open source AI app builder we develop, on Product Hunt. Taking on this launch as a challenge from Japan to the world, after 24 hours of intense competition, we ultimately achieved the outstanding result of Product of the Day #2.

We finished #2 on Product Hunt Daily! 🥈

So close to the top spot, but this was a great opportunity to build momentum heading into 2026. 📈
Thank you to everyone who supported https://t.co/gnwvnEOhgJ 🙏https://t.co/KJgeyMWYYI pic.twitter.com/RQeH4IDnjj

— Giselle (@Giselles_AI) December 30, 2025

In this article, I’d like to share from an engineer’s perspective what happened behind the scenes during the launch, as well as the tech stack powering Giselle.

What is Giselle? - Toward a World Where Anyone Can Build AI Apps

Giselle is an open source platform that allows anyone to build AI applications using an intuitive visual interface, even without programming knowledge.

We started this project with the vision of “making the benefits of AI accessible to everyone, not just specialists.” With Giselle, you can create diverse AI apps like chatbots, document summarizers, and data analysis tools in a no-code manner, simply by connecting nodes together.

To realize this vision of “democratizing AI,” we chose to release Giselle as open source and grow it together with developers and creators around the world.

• Giselle: A Visual AI App Builder Now Open-Source for the World \— Enabling Anyone to Intuitively Create AI Applications | ROUTE06

The Tech Stack Powering Giselle

• オープンソースAIアプリビルダー「Giselle」の技術スタック #Next.js - Qiita
• OSS AIアプリビルダー Giselle の裏側で動く PostgreSQL + pgvector RAG システム

The 24-Hour Battle on Product Hunt

At 17:01 JST on December 29th, we published our Product Hunt page and entered the 24-hour ranking battle.

Amidst powerful products launching one after another from around the world, Giselle was supported by warm encouragement and upvotes from many people, and temporarily achieved the #1 spot in the middle of the launch. Seeing the community come together to support us, primarily through X, LinkedIn, and Facebook, was truly reassuring and moving.

1️⃣ Giselle 🥇
🔼 311

Build and run AI workflows. Open source.https://t.co/5LGpDaxd7G

— Product Hunt Today 🚀 (@ProductHunToday) December 29, 2025

In the end, we finished in 2nd place, falling just short. However, through this challenge, we received numerous valuable feedback and encouraging messages from users around the world. I feel this was an achievement even more valuable than increased product visibility.

Future Outlook - Aiming for 10x Value

This success on Product Hunt is a major milestone for Giselle to spread its wings to the world. However, this is not the goal but merely a new starting line.

• Product Hunt公開、ビジュアルAIアプリビルダー「Giselle（ジゼル）」｜遠藤 崇史 | Takafumi Endo

We will sincerely take the feedback we received to heart and continue to evolve Giselle into an even better product together with the open source community. Our goal is to deliver “10x customer value.”

• 10xの顧客価値を目指して｜遠藤 崇史 | Takafumi Endo

Please check out our GitHub repository. We wholeheartedly welcome contributions in any form - Stars, Issues, Pull Requests. Let’s create together a world where anyone can build AI apps!

That’s all from the Gemba, where we celebrated Giselle, the open source AI app builder, achieving #2 worldwide on Product Hunt.