Konstantin Keller

Working on LLM based AI Assistant @ http://zing.coach/

@koskeller 110 X followersFirst product launched 2y ago

100% full-depth creator dossier open: complete product portfolio, 12-month combined traffic & MRR curves, shipping cadence, and timeline events.

Traffic

Portfolio · Last 12 months

Monthly visits

Products and research metrics
Product	Tagline	Category	Visits · Oct	MoM	Launched	Revenue
Brieflanebrieflane.comQuick book summaries that save you time. Get main points from 4000+ books in minutes, not hours.	Quick book summaries that save you time. Get main points from 4000+ books in minutes, not hours.	Books & Reading	8.1K	Down2.3%	2024-09	Undisclosed
PDF Summarizerpdfsummarizer.proDiscover the top questions to ask AI for better results. This guide covers prompts for research, analysis, and problem-solving, with PDF Summarizer tips.	Discover the top questions to ask AI for better results. This guide covers prompts for research, analysis, and problem-solving, with PDF Summarizer tips.	PDF & Document Tools	6.4K	Up18.0%	2025-09	Undisclosed
Feenfeen.aiThe only math solver that checks its own work. 3 AI models verify every answer.	The only math solver that checks its own work. 3 AI models verify every answer.	AI Tutoring & Homework Help	<5K	Prev <5K	2025-11	Undisclosed

Launches, marketing, revenue milestones, and pricing/plan/positioning changes across products

Nov 1 · 14d ago
- PDF Summarizer Adopted technology: Google AnalyticsFeatures
  —→Google Analytics
- PDF Summarizer Adopted technology: TurbopackFeatures
  —→Turbopack
- PDF Summarizer Homepage title changed to “PDF Summarizer - Summarize long PDFs with AI”Positioning
  PDF Summarizer - Summarize PDFs with AI→PDF Summarizer - Summarize long PDFs with AI
Nov 15, 2025 · 12mo ago
- Feen launched on UneedLaunch
- Feen launchedNew product