Hapstone S4 — New Generation of Compact Sharpening

In 2025, Hapstone introduces its most universal and affordable sharpening system yet — Hapstone S4, proudly developed in Ukraine.

Designed for those who want high results without complexity, the S4 combines compact size, precise mechanics, and a modular structure that grows with your sharpening needs.

Sharpening Made Easier Than Ever

A dull knife is no longer a problem. With Hapstone S4, anyone can restore a razor-sharp edge in minutes — no prior experience required.

Smooth angle adjustment, secure knife clamping, and a convenient flip-over mechanism make the process intuitive and fast.

Our Path: From M2 to S4

Hapstone first entered Kickstarter in 2018 with the M2 sharpener, supported by 163 backers.

In 2024, our Hapstone RS campaign became our most successful to date — 566 backers and over $160,000 raised.

Now we return with Hapstone S4 — our most compact and versatile sharpener ever.

Kickstarter allows us to stay independent, listen directly to customers, and innovate together with the sharpening community.

What Hapstone S4 Can Do

Despite its small size, the S4 delivers the stability and precision of systems costing several times more.

We’ve put over twelve years of experience into this compact design:

• Perfect for kitchen knives, EDC, outdoor, and hunting knives

• Compact footprint with pro-level accuracy

• Compatible with 4×1 inch stones

• Engineered for consistent geometry and reliable sharpening performance

Add the Hapstone Case to keep your sharpener, stones, and accessories neatly organized.

Why Support the Project

By launching Hapstone S4 on Kickstarter, we give early supporters access to an exclusive $109 early-bird price.

This is our way of thanking the community that has helped shape Hapstone products over the years.

Join the Campaign

Hapstone S4 is now live on Kickstarter.

Support the campaign and be among the first to receive the new sharpener.

👉 Support the project on Kickstarter