Promptly

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  Promptly

Inspiration As builders, we constantly had ideas for tools, dashboards, or utilities—but turning them into actual web apps was always a time-consuming process. We thought: "What if we could skip the boilerplate, skip the UI layouts, skip the setup... and just describe the app we want?" That’s how Promptly was born—a one-prompt AI app builder that turns your idea into a clean, functional web app within seconds, powered entirely by Bolt.new and OpenRouter's LLaMA model.

What it does Promptly lets users generate fully working, beautifully styled web apps by writing a single natural language prompt.

You type: “Build me a task tracker with login, dark mode, and mobile view.”

Promptly gives you: A functional, mobile-friendly app with authentication, dynamic UI, and a backend—auto-deployed and optionally mapped to a custom domain.

It uses the nvidia/llama-3.3-nemotron-super-49b-v1:free model via OpenRouter to power the intelligent app generation, and leverages Bolt.new to build the UI live in the browser.

How we built it We built Promptly entirely on Bolt.new, starting from a clean slate. Here's how it came together:

We integrated the OpenRouter API to communicate with the LLaMA-3.3 Nemotron model.

A backend handler parses the user's prompt, calls the model, and injects code directly into Bolt’s live editor.

We designed a custom UI in black-and-white dark mode, giving the app a modern, techy feel.

For deployment, we used Netlify, and for scaling ideas to real businesses, Supabase integration is ready.

Entri + IONOS integration lets users claim a domain to publish their app instantly.

Challenges we ran into Single-prompt fidelity: Ensuring the app build sticks closely to a one-shot prompt was tricky. LLMs tend to overgenerate or miss minor details, so we had to fine-tune the prompt and post-processing.

UI consistency: Making sure generated apps didn’t look messy took careful structuring of the default component tree.

Time limits: Balancing what to build in a short timeframe versus what to polish for demo-worthy UX.

Accomplishments that we're proud of Built a production-grade app generator that works with a single prompt.

Fully integrated Netlify, Supabase, Entri, and OpenRouter APIs inside Bolt.new’s environment.

Designed an aesthetic, tech-forward UI that we’d actually love to use.

Kept the entire build within Bolt, fulfilling the core Hackathon requirement cleanly.

What we learned Bolt.new is surprisingly powerful when paired with LLMs and external APIs.

Thoughtful prompts and structured post-processing logic can yield surprisingly robust apps.

Users don’t want to configure endless settings—they want speed, clarity, and good UI by default.

Creative use of AI + no-code = big unlocks for indie makers and startup founders.

What's next for Promptly AI Tweaks Panel: Let users refine or re-prompt small sections (e.g., "change layout to grid view").

Template Store: Popular prompts become templates that users can remix or launch instantly.

Voice & Video Gen: Add voice UI via ElevenLabs and AI agents via Tavus.

Team Mode: Collaborate in real-time like Figma for app building.

Reddit Integration: Users can post and share their builds to r/webdev or r/PromptlyShowcase via Reddit’s Developer API.

Ultimately, we want Promptly to become the fastest idea-to-app builder on the internet—and the go-to for makers who want to skip the boilerplate and build something real.

Built With

• bolt.new
• entri
• netlify
• nvidia-llama-3.3-nemotron-super-49b
• openrouter-api
• supabase