Kerfbook: Laser Settings Log

Kerfbook is the settings notebook for laser engravers and cutters — diode, CO2 and fibre. Save the power, speed and passes that worked, find them again in seconds, and stop wasting material on guesswork.

YOUR SETTINGS, ORGANISED
• One library per machine, material, thickness and operation: engrave, score, cut, fill and photo.
• Power, min power, speed, passes, line interval / LPI, air assist, focus offset, notes and a star rating.
• Photos of every result, so you can see what "30 % at 300 mm/s" actually looks like on birch ply.
• Search and filter by machine, material or operation.
• Values shown in the units your software uses: percent or S-value (GRBL), mm/s or mm/min.

TEST GRIDS YOU CAN BURN
• Build a power × speed matrix: rows, columns, ranges, square size, gap and labels.
• Export a true-size SVG in millimetres with one layer colour per square, ready to import into your laser software, plus a layer legend.
• After the burn, tap the best square and save it as a setting in one step.
• Pro: grids up to 12 × 12 and a PNG reference card to print.

MOVE A SETTING TO ANOTHER LASER (PRO)
• Scale any setting to another machine by wattage ratio, keeping the energy per millimetre the same.
• Respects 100 % power and the machine's maximum speed.
• Always saved as a clearly marked "starting point" — never as a proven value.

SAFETY BUILT IN
• Starter list of common materials: woods, plywood, MDF, leather, cast and extruded acrylic, slate, glass, anodised aluminium, card, cork and fabric, with practical cautions.
• PVC, vinyl, faux leather, ABS, polycarbonate, PTFE and fibreglass are flagged "never laser" — Kerfbook refuses to store settings for them, even under a custom name.
• Laser-safety reminders: eye protection for your wavelength, ventilation, never unattended.

JOB COST & QUOTES (PRO)
• Material, laser time, your time, machine wear, electricity, setup fee and markup → price and price per item.
• Estimate laser time from a saved setting's speed.
• Send a clean quote by message or email; keep a job log with photos.

YOUR DATA STAYS YOURS
• Works offline. No account, no cloud — everything is on your phone.
• Pro: CSV and JSON export and import, full backup, and a printable PDF settings sheet for the wall next to your machine.

Kerfbook is a companion app: it never connects to or controls a laser. Burn results vary with lens, focus and material batch — always test on scrap first.

Free: 1 machine, 15 settings and 5 × 5 test grids, with ads. Kerfbook Pro is a single one-time purchase: unlimited machines and settings, scaling, quotes, exports, PDF sheet and no ads.