Youtube AI Summarizer & PDF Boost + Text Editor

I want to launch a full-featured web app that lets users:
• paste a YouTube link and instantly receive an AI-generated written summary;
• create or upload documents, enhance them as polished PDFs, and perform rich text edits (grammar correction, formatting tweaks, light rewriting);
• pay seamlessly for premium usage and manage their own accounts.

Core modules I envision
1. YouTube Summarizer
– Fetch video transcript automatically.
– Run an NLP model (OpenAI, GPT-4, Grok, Claude to condense the content into concise paragraphs.
– Display and let users copy or download the summary as PDF or plain text.

2. PDF Creation & Boost
– Allow users to upload multiple files, merge them, add comments or highlights, then export a clean, share-ready PDF.
– Support conversion from common formats (DOCX, PPTX, TXT) to PDF before enhancement.

3. In-Browser Text Editor
– Offer grammar and spell checking alongside quick style presets.
– Provide a “Rewrite” button that leverages AI to rephrase selected text while keeping the original meaning.

4. User & Payment Flow
– Registration/login via email, Google, or GitHub.
– Tiered subscription and pay-as-you-go credits handled by Stripe (or a comparable gateway).
– Dashboard where users can view usage history, invoices, and saved files.

5. Admin Console
– View metrics, manage plans, and moderate users or content.

Tech preferences
– Modern front-end framework (React, Vue, or Svelte).
– Node.js or Python back end with REST or GraphQL API.
– Secure cloud deployment (AWS, GCP, or Azure) and CI/CD pipeline.

Deliverables
• Complete, well-documented source code.
• Clean UI/UX that works on desktop and mobile.
• Setup guide plus a short loom/video walkthrough.
• Two weeks of post-launch support for minor fixes.

If you’ve built SaaS products that blend AI services with payments before, I’d love to see live links or repos. Let’s create something users will come back to every day.