What It Was
InstantDocs turned screen recordings into professional documentation automatically. You record yourself walking through a product flow, upload the video, and it comes back as a polished step-by-step guide with screenshots, numbered steps, and a narrated walkthrough. No manual editing.
This was the pivot from Kroto. We discovered through customer conversations that product teams needed documentation tooling more urgently than course creation tooling. So we rebuilt the product around that use case.
How It Worked
- User records a screen capture (or uploads an existing recording).
- FFmpeg extracts frames at scene-change boundaries.
- Whisper transcribes the audio narration.
- GPT-4V receives the frames + transcript and generates structured step-by-step documentation.
- The output renders as a shareable guide with embedded screenshots, copyable step text, and an embedded video player.
The hardest part was making the frame extraction smart enough to capture the right moments. Raw scene detection produces too many frames (every cursor movement is a "scene change"). We ended up doing two passes: coarse detection first, then a GPT-4V pass that selected the most informative subset.
Results
- Launched on Product Hunt twice: ranked #4 the first time, #1 Product of the Day the second.
- 2,000+ guides created, with ~100,000 views across published guides.
- Acquired by GrooveHQ and rebranded as their core documentation product.
What I Learned
Pivot fast when customers tell you something. The course-builder version had users, but when we started asking "what's the most painful documentation problem you have," we heard the same answer from a dozen companies in three weeks. That's a signal.
Video processing is operationally expensive. FFmpeg jobs, storage, CDN egress. The unit economics are harder than pure SaaS. We had to be careful about which tiers got full video processing vs. static screenshots only.
Product Hunt ranking is a vanity metric with one real use. It drove spikes of sign-ups that were mostly useless (wrong ICP) but generated enough social proof to open enterprise conversations. Treat it as a PR event, not a growth channel.