iOS · App Store · design + build
Run the
numbers.
A race-pace calculator that treats runner's math like typography.
Product strategy, UX/UI design, and full SwiftUI development — shipped from zero to the App Store by SUUR.
Every pace calculator looks like a spreadsheet. PaceCalc sets a marathon goal like a broadsheet front page — and answers on every keystroke.
3
Modes — pace, time, distance
24
Built-in race distances
3
Share-card layouts
5.6 MB
Free. No ads. No accounts.
The idea
The colon is the brand.
The answer lands as an enormous serif numeral — and in every pace and time on screen, the colon is tinted: hi-vis on ink, clay on paper. One rule, applied everywhere, is a brand. Pick two of pace, time, and distance; the third recomputes on every keystroke, in both unit systems at once.
Under it, split strategies — even, negative, positive, or custom — turn a finish-line wish into a per-kilometer plan.
The experience
From finish-line wish to race-day plan.
01
Save the race. Watch it approach.
A plan becomes a saved race with a countdown in days — Chicago in 154, New York in 175. After the gun, a post-race check-in closes the loop: Berlin, goal 3:00:00, finish 3:08:21, the +8:21 in hi-vis so it stings just enough.
02
A goal card worth posting.
Broadside is the poster layout: race name in serif italic, the pace enormous, finish, distance, and strategy set like footnotes. It renders as an image built for the group chat and the story post — the app's growth loop is a screenshot.
03
Or a pace receipt.
Terminal prints the plan like a till receipt on cream paper — PACE RECEIPT, the race, the pace, then every split ticked down the page to the 0:50 tail of a marathon. Runner's math, itemized.
04
Paper or ink.
The whole app lives in two materials: paper — warm cream with a clay accent — and ink, near-black with hi-vis. Minimal strips the card to type alone, and the toggle sits right in the share sheet.
Beyond the app
Race day counts down on the Lock Screen.
A WidgetKit lock-screen widget keeps the next race and its days-to-go one glance away, and App Intents put all three calculations in Siri and Shortcuts. Every card also carries a link that opens the same plan on pacecalc.com — the app and the web platform speak one URL.
Built with intention
100% native SwiftUI. All math in one pure, verified module.
The result
Live on the App Store. 5.6 megabytes, zero asks.
Free, offline-capable, no ads, no accounts, no sign-up — the whole product is smaller than one photo. It pairs with the PaceCalc web platform, also designed and built by SUUR — strategy, UX/UI, and every line of Swift shipped end to end.
“Most utilities get used and deleted. A utility with taste gets kept — and shared.”
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