Explainable
The result shows the arithmetic or rule behind it. It does not hide recommendations behind an unexplained score.
Useful maths, clear limits
Running tools
Plan the run without handing over your training history. These tools work in the browser, show their assumptions and turn inputs into decisions you can check.
Free to use. No account required. GPX files and Shoe Locker data stay on your device.
Tool 01
Running shoe database
Search hundreds of current and archive shoe records across brands, then compare the evidence and structured specifications.
Open tool →Tool 02Cross-brand shoe comparison
Compare up to four records by terrain, role, weight, drop, cushioning, guidance, weather protection and evidence status.
Open tool →Tool 03Shoe Passport
Save preferences, review rotation coverage and connect every Zone2 shoe decision.
Open tool →Tool 04Which shoe today?
Match today’s run and weather against suitable pairs already in your locker.
Open tool →Tool 05Shoe comparison
Put two or three current models beside the same source-backed fields.
Open tool →Tool 06Rotation gap checker
Separate a useful missing role from an optional extra pair.
Open tool →Tool 07Shoe price watchlist
Record model, size and target price without mixing commerce into editorial ranking.
Open tool →Tool 08Race Pack
Build and save a printable event plan with splits, fuel, logistics, kit and crew notes.
Open tool →Tool 09GPX race analyser
Read distance, climbing, descent and elevation locally from a GPX route file.
Open tool →Tool 10Weekly check-in
Arrange current mileage, then adapt the week for energy and available time.
Open tool →Tool 11Race comparison
Compare course distance, climbing density, cut-off pace and aid spacing.
Open tool →Tool 12Club Desk
Keep a reusable, device-only library of run-leader session cards.
Open tool →Tool 13Club session builder
Create pace-group interval cards, timings and a shareable run-leader briefing.
Open tool →Tool 14Shoe finder
Rank current shoes against your surface, use, cushioning, guidance and fit needs.
Open tool →Tool 15Shoe locker
Track your own shoe rotation, mileage and optional cost per kilometre on this device.
Open tool →Tool 16Pace calculator
Convert time and distance into kilometre pace, mile pace, speed and finish times.
Open tool →Tool 17Running fuel planner
Turn duration and a chosen carbohydrate target into transparent totals.
Open tool →Private by design
No training account is required. Device-only features say so clearly and can be reset by you.
Built for judgement
Weather, terrain, health and event rules can overturn a neat calculation. Every tool names the gaps.