Overview
Chrome Goldmine is a curated database of 9,656 expired Chrome extensions, designed for indie hackers and solo founders who want to find profitable rebuild opportunities. It provides revenue estimates, competitor analysis, rebuild difficulty scores, and a step-by-step action plan — all research done for you. Priced at a one-time $23.20 (launch discount), it includes lifetime updates and a 30-day money-back guarantee.
Sudoku Printable is a free online tool that generates unlimited printable sudoku puzzles in seconds. It offers 19 variants (Standard, Diagonal, Windoku, Odd/Even, Knight, Jigsaw, etc.), multiple grid sizes (4×4 to 16×16), and six paper formats. No registration or payment is required — just choose settings, click generate, and download a clean PDF or print directly.
Feature Comparison
| Feature | Chrome Goldmine | Sudoku Printable |
|---|---|---|
| Primary Purpose | Database of expired Chrome extensions for rebuild opportunities | Free printable sudoku puzzle generator |
| Target Audience | Indie hackers, solo SaaS founders, vibe coders | Teachers, puzzle enthusiasts, casual solvers, parents |
| Core Offering | 9,656 extensions with revenue estimates, competitor analysis, rebuild difficulty scores | Unlimited sudoku puzzles in 19 variants, multiple grid sizes, paper formats |
| Delivery Format | Interactive Notion database + CSV export + PDF guides | Instant PDF download or direct print |
| Customization | Filter by revenue, difficulty, niche, user base | Choose variant, difficulty, grid size, paper size, font size, number per page |
| Updates | Quarterly updates with new expired extensions | Each generation creates brand-new puzzles; no updates needed |
| Registration Required | Purchase required via Gumroad | No registration or payment needed |
| Monetization | One-time payment ($23.20 launch price) | Free (no ads, no paywalls) |
| Support | 30-day money-back guarantee, email support | Feedback email provided |
| Unique Selling Point | Research done for you — revenue estimates and competitor gaps | 19 sudoku variants, unlimited free generation, no sign-up |
Pricing
Chrome Goldmine: One-time payment of $23.20 (launch discount from $29). Includes lifetime access and quarterly updates. 30-day money-back guarantee.
Sudoku Printable: Completely free. No registration, no payment, no limits. Generate as many puzzles as you want.
Pros and Cons
Chrome Goldmine
Pros:
- Saves hundreds of hours of manual research
- Revenue estimates and competitor analysis included
- One-time payment with lifetime updates
- 30-day money-back guarantee
- Targeted at high-potential rebuild opportunities
Cons:
- Requires payment upfront
- Only useful for Chrome extension builders
- Revenue estimates are projections, not guarantees
Sudoku Printable
Pros:
- 100% free with no registration
- 19 puzzle variants and multiple grid sizes
- Instant PDF download or print
- Unlimited unique puzzles generated on demand
- Suitable for all ages and skill levels
Cons:
- No advanced analytics or market data
- 16×16 grid is still in beta (may lack unique solutions)
- No offline app or mobile version
Verdict
Chrome Goldmine is a specialized research tool for indie developers seeking profitable extension rebuild ideas, while Sudoku Printable is a free, versatile puzzle generator for educators and puzzle lovers. Choose Chrome Goldmine if you want to shortcut market research for a side project; choose Sudoku Printable if you need endless, customizable sudoku puzzles for personal or classroom use.
Chrome Goldmine
Sudoku Printable