commentra.ai

Introducing Commentra.ai- a new built platform that helps startups, creators, and businesses get customers by using AI-powered YouTube comment marketing. no ads, no spam, just smart engagement.

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Inspiration

The idea for Commentra.ai came from a simple question: What if brands could grow just by joining the right YouTube conversations — without spending anything on ads? While ads were too expensive and SEO took months, YouTube comments offered an untapped channel: millions of viewers, already engaged, already curious. That’s where Commentra.ai comes in — an AI-powered platform that helps brands show up where their audience already is.

What it does

Commentra.ai is an AI-powered platform that helps brands grow by commenting on highly relevant YouTube videos — in a way that feels natural, engaging, and human. 1. Users create a brand profile (name, industry, audience) 2. The platform uses AI to discover trending and ongoing videos in that niche 3. Commentra transcribes the video, analyzes context, and writes authentic, brand-aware comments 4. Brands can post, edit, or regenerate these comments 5. A real-time dashboard tracks reach, ranking, and engagement 6. If a comment drops in position, users can boost it back up In short: it’s no-ads customer acquisition — through conversation.

How we built it

  1. I used Bolt.new as my main builder to move fast without code.
  2. Supabase handles database, user auth, and file storage.
  3. I integrated Google Gemini AI to write human-like, non-spammy comments.
  4. YouTube Data API v3 powers video search, syncing, and comment tracking.
  5. Google Search Console API shows how many people are Googling your brand after seeing comments.
  6. I used Yoco for local payments, and Netlify for secure, fast global hosting.
  7. I also built a Custom Reach Calculator and YouTube Sync Service to track visibility and boost rankings.

Challenges we ran into

  1. Tuning Gemini AI to write comments that were authentic, not robotic or salesy.
  2. Avoiding spam while still promoting the brand naturally.
  3. Respecting YouTube's API limits while scaling video discovery.
  4. Making sure the platform could support real-time feedback and analytics. ## Accomplishments that we're proud of

What we learned

  1. AI is only powerful when guided by empathy and context.
  2. Comment sections are the new billboards — if you use them right.
  3. A good product doesn't need a big budget, just a clear use case.
  4. You can build global-level tools right here in South Africa using no-code and AI.

What's next for commentra.ai

  1. Onboarding more local brands and creators across South Africa.
  2. Testing with real businesses like Thrive Tutors SA, our example education brand.
  3. Expanding to other platforms (TikTok, Instagram Reels).
  4. Offering users deeper insights through dashboards and email summaries.
  5. Exploring comment-based conversion tracking and lead capture.

CHALLENGE I'm entering for:

  1. Startup Challenge

BONUS AWARDS I'm entering for:

  1. Inspirational Story
  2. One-Shot Competition
  3. Uniquely Useful Tool
  4. Creative Use of AI
  5. Most Beautiful UI
  6. Future Unicorn
  7. Sharpest Problem Fit
  8. We Didn’t Know We Needed This
  9. Most Likely to Get Funded

Built With

  • bolt.new
  • gemini
  • google-search-console
  • supabase
  • yoco-payment-gateway
  • youtupe-data-api
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