ToolNewFor Recreational runners

Evensplit

Your race, worked out to the second.

Turns a goal race time into pace, per-kilometre or per-mile splits, a printable pace band, and a training week that never raises mileage more than 10%.

Download the source

Zip, 194 KB. MIT licence. Built 28 Oct 2026.

Open the app Open full screen

Loading the live site…

This is the real site, not a mock-up. Click around; the button on it opens the working app.

What you get

Everything a tool needs, already done.

Pages and screens

Hero
How it works
Pace band
Features
Pace calculator
Training week

Features

Pace, time and distance conversion
Even or negative splits for any race
Printable pace band
Training week capped at 10% ramp
Kilometres or miles
Runs in your browser, no sign-up

Palette

#c63d0f
#a8330c
#fde9df
#ffffff
#15191c
#59616a

Style

Minimal
Bold
Editorial

Evensplit on a phone — On a phone, as shipped.

For developers

A real codebase, not a page builder export.

Stack

Vite, React 19 and TypeScript for the app. The launch page is plain HTML, CSS and a little JavaScript with no build step. Vitest for unit tests, Playwright for browser tests.

Run it

unzip evensplit.zip
cd evensplit
npm install
npm run dev

In the zip

site/ the launch page with the built app in site/app/
src/ and e2e/ the app source and tests
docs/technical-docs/ architecture, runbook, quick reference
START-HERE.md and LICENSE (MIT)

Also on the shelf

Home & PersonalTool
Dues
Lists your subscriptions, works out what you really pay each month and year, warns you before renewals and trial ends, and shows what cancelling would save.
Home & PersonalTool
Pantry & Plate
Lay recipes on a seven-day grid, set servings, and get one shopping list grouped by aisle with the contents of your pantry already taken off.
Home & PersonalTool
Quits
Log shared trip costs in any currency with uneven splits, and see the fewest payments that settle everyone, with all data saved in your browser.

Live preview