EdgeSage pairs a deep knife-steel comparator with a live sharpening angle coach. Compare any two steels, get the exact grit ladder and angle for the one you're holding, then hold that angle with real-time feedback from your iPhone's motion sensors.
iPhone and Android · iOS 17+ / Android 8+ · Everything works fully offline
Steel Sage is a searchable database of knife steels with side-by-side comparison charts across edge retention, toughness, corrosion resistance, wear resistance, and ease of sharpening. The Angle Coach reads your bevel angle live from your iPhone's motion sensors, in degrees per side, with haptic and voice feedback as you work. Every session you log builds the sharpening history for that knife.
Search the database and pull up side-by-side radar and bar charts across five performance axes, composition breakdowns, and plain-language pros and cons.
Answer four questions about how you actually use a knife. Get a ranked shortlist, each with a one-tap path straight to its sharpening recipe.
Rest your phone on the blade. It reads your bevel angle live in degrees per side, with haptic and voice correction the moment you drift off your target.
Freehand stones, Wicked Edge, KME, Lansky, Work Sharp, and strops — pick your setup and the coach adjusts its guidance to match.
A library for the knives you own, with full sharpening history and a sharpness trend line, so you can see how an edge is actually holding up.
Anonymous field reports of felt edge retention, ranked once 5 users have reported. Built from real sessions, not lab numbers alone.
This is the whole idea in one path: any steel in the database is one tap from a loaded coaching session, and every session you log builds the sharpening history for that knife.
Find your steel or run the Wizard. See how it stacks up on edge retention, toughness, and the rest.
Steel Sage hands off the grit ladder and target angle straight to the coach — no manual lookup.
The coach holds you at the target angle. Haptic and voice feedback tell you when you've drifted.
Rate how the steel held up. Your sessions build a sharpness trend for that knife over time.
EdgeSage needs no account and no network for the core app — the steel database, comparator, Wizard and Angle Coach work fully offline from first launch. Your knives, sessions and photos live on your device first, and are uploaded only if you sign in to sync them across your devices.
The free tier is genuinely useful on its own. Pro lifts its two limits for people who sharpen constantly.
Prices in USD, billed through the App Store. Plans renew automatically until cancelled.
iOS first, Android to follow. Check back here — this page updates the moment the App Store link is live.
