KnifeKeep: Blade Care
Sharpen & rust care reminders
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Manage your knives’ sharpening cycles and rust, with photos. Never forget when you last sharpened, or pull out a rusted blade. Sharpening timing by steel, automatically.
Keep your knives at their sharpest.
"When did I last sharpen this?" "I pulled it out and it had rusted." Your knives deserve better — let KnifeKeep look after their sharpening and rust care.
■ Sharpening timing by steel
Stainless, carbon steel, Damascus, ceramic — each holds an edge differently. KnifeKeep estimates the sharpening timing and gently reminds you as it approaches.
■ Spot the ones about to rust
Carbon steel and Damascus rust when left unused or wet. From the last day used, see "Cared for" or "May rust" — a nudge to wipe it or add oil.
■ Your collection, in photos
Photograph each knife and the subject is cut out automatically. Your personal collection lined up beautifully.
■ Three-stage sharpening reminders
Ahead of time (2 weeks, a few days) → on the day → and gently every day after until it's done. A dull edge is unsafe — never miss it.
■ Tips for cooks
From sharpening angle and whetstone grit to no-dishwasher and choosing a cutting board — 24 tips and a mascot make care more fun.
■ Widget support
See knives due for sharpening and their status at a glance on your Home Screen.
[Free]
• Register up to 3 knives
• Sharpening reminders
[Premium]
• Unlimited knives
• Group by storage
• Care log (type, whetstone, notes)
• No ads
One-time $20 or $1.49/week (no free trial). Subscriptions auto-renew and are billed to your Apple ID unless canceled at least 24 hours before the period ends. Cancel anytime in Settings.
Sharpening cycles are general guides based on the steel. Adjust to how often you use it and your preference.
■ LINKS
• Support: https://tsuzukit.com/contact/
• Terms of Service: https://tsuzukit.com/legal/terms-of-service.html
• Privacy Policy: https://tsuzukit.com/legal/privacy-policy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Ryo Tsudukihashi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- TsuzuKit
- Size
- 7.2 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
16+
- 16+
- Contains
Advertising
- In-App Purchases
Yes
- Premium (Weekly) $0.99
- Premium (Lifetime) $19.99
- Copyright
- © 2026 Ryo Tsuzukihashi