Hapstone S4 Knife Sharpener - a new level of compactness?

Hapstone S4 — Compact Knife Sharpener on Kickstarter

Hapstone S4 is our new compact and universal sharpening system, proudly developed in Ukraine and now launched on Kickstarter. With an exclusive early price of $109, it delivers professional results in a small, affordable format designed for everyday use.

Sharp Knives Made Simple

With Hapstone S4, a dull knife is no longer a problem. Anyone can restore a razor-sharp edge in minutes — no prior sharpening experience required. Smooth angle adjustment, secure knife clamping, and a flip-over mechanism make the process intuitive and repeatable.

Compact Size, Serious Performance

Despite its small footprint, Hapstone S4 offers the precision and stability of systems that cost much more. It works perfectly with 4×1 inch stones and is ideal for kitchen knives, EDC, outdoor, and hunting knives.

• Compact and portable sharpening system
• Supports 4×1 inch stones
• Accurate angle control and secure clamping
• Perfect for beginners and experienced users

Support Hapstone S4 on Kickstarter

Hapstone S4 is available now on Kickstarter with an exclusive early-backer price of $109. Support the project, join our sharpening community, and be among the first to receive the new Hapstone S4 sharpener.

Support the Hapstone S4 project on Kickstarter — $109 Early Price