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GridLab
Design Sudoku puzzles worth solving by hand
GridLab is an iPad app for designing Sudoku puzzles to solve by hand, not on screen. You set the constraints, generate the grid, then export to PDF, PNG, SVG, or EPUB for paper, physical media, or e-ink. 5 combinable variants: Classic, X-Sudoku, Anti-King, Anti-Knight, Hyper. Every puzzle shows its logical depth, clue density, and whether it requires guessing to solve. No hints, no gamification, no ads, no subscription. A voluntary tip is the only ask. Free to download. iPad only.
Top comment
Hi Product Hunt! I built GridLab because I wanted a tool that didn't exist: an app that helps you design Sudoku puzzles for manual solving, not one that walks you through solving them on screen. The idea came from a simple observation: creating a puzzle is harder and more interesting than solving one. When you set the constraints and generate a grid, you have to understand what makes a Sudoku tight, elegant, or broken. The app surfaces the structural properties of each puzzle so you can make informed choices rather than just accepting whatever gets generated. A few things I'm happy with: 5 combinable variants (X-Sudoku, Anti-King, Anti-Knight, Hyper) that stack and interact in non-obvious ways EPUB export so you can load a whole collection onto a Kobo or e-ink device Zero gamification. No badges, no streaks, no levels. The app gets out of your way. Built natively for iPad in SwiftUI, with CloudKit sync. Happy to answer questions from anyone into puzzle design, paper solving, or apps that don't try to keep you hooked.
About GridLab on Product Hunt
“Design Sudoku puzzles worth solving by hand”
GridLab was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #142 on the daily leaderboard. GridLab is an iPad app for designing Sudoku puzzles to solve by hand, not on screen. You set the constraints, generate the grid, then export to PDF, PNG, SVG, or EPUB for paper, physical media, or e-ink. 5 combinable variants: Classic, X-Sudoku, Anti-King, Anti-Knight, Hyper. Every puzzle shows its logical depth, clue density, and whether it requires guessing to solve. No hints, no gamification, no ads, no subscription. A voluntary tip is the only ask. Free to download. iPad only.
On the analytics side, GridLab competes within iPad, Productivity and Games — topics that collectively have 757.7k followers on Product Hunt. The dashboard above tracks how GridLab performed against the three products that launched closest to it on the same day.
Who hunted GridLab?
GridLab was hunted by Luca Infante. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of GridLab including community comment highlights and product details, visit the product overview.