A body in motion stays in motion.
Inertial is a running app built accuracy-first and privacy-first. Training load, fitness & freshness, best efforts, grade-adjusted pace — everything other apps paywall is free here. Forever.
No premium tier, no locked graphs, no trial that runs out. If we build it, you get it.
Every run adds weight. See how much you're carrying this week — and when to put it down.
Two lines, plain words: how fit you're getting, how tired you are right now.
Your fastest 1k, 5k, 10k and half — pulled from every run you've ever logged.
Hills counted fairly. A 7:10 climb can be a 6:20 effort — we show you both.
Years in another app shouldn't cost you your story. Ask Strava for your archive — we'll walk you to the button — then upload the ZIP once and we do the rest.
Ask for your archive. In Strava: Settings → My account → "Download or delete your account" → request your archive. The ZIP lands in your email.
Upload it once. Chunked and resumable — a flaky connection can't kill it, and a 2 GB, eight-year archive is done in under 15 minutes.
Everything comes home. Every run, PR, photo and shoe — distances and bests re-timed by our own engine, with the deltas shown, never hidden. Uploading twice changes nothing.
FIT, GPX and TCX supported — archives from watches and other apps come home the same way. Anything unreadable lands in a "needs attention" list with a plain reason and a retry. Nothing is dropped silently.
The feed, the night instrument panel you record on, and the run detail that shows its work.
Negative splits after km 15 — your strongest closing 5 k since March.
Streaks, bests, events and challenges struck as coins — your number engraved on the face. No badges raining from the sky.
Distance challenges are free too — join with one tap, cheer friends along the way. 👏
Portability cuts both ways. A full export of everything you've added — runs, photos, profile — is yours from the settings screen, and every run's raw file downloads straight from its transparency view. Deleting your account happens in-app, with the export offered first. No lock-in, no guilt trip at the door.
An Apple Watch app is on the way — the record screen's night instruments on your wrist: big tabular numerals, bright teal, readable mid-stride in the dark. The watch is your remote and heart-rate source; your phone owns the recording, so a run started from the wrist is a real run.
Raw vs corrected GPS on every run, the 200 m around home hidden from every shared map, and a live beacon your family opens from WhatsApp — no account needed.
Read how we earn your trustFree, forever — training load, fitness & freshness, best efforts, grade-adjusted pace, all of it. No ads, no premium tier, no selling your data. The business, when it comes, is race organizers paying for registrations — never athletes. If any of that ever changes, we'll say so in plain words first.
In Strava: Settings → My account → "Download or delete your account" → request your archive, and the ZIP arrives by email. Upload it here once — every run, PR and photo comes home, stats re-timed by our engine. FIT, GPX and TCX archives from other apps and watches work the same way, and anything unreadable lands in a "needs attention" list with a plain reason and a retry. Most archives finish in minutes.
It stays yours. A privacy zone hides the 200 m around home from every shared map, photo location data is stripped before anything leaves your phone, and nothing about where you run is used for suggestions. Every privacy setting explains itself in one sentence.
Both, with Android first in line for polish — and an Apple Watch app on the way. Sign in with Google, Apple, or just your phone number. No passwords, anywhere, ever.
We're letting runners in batch by batch — a small club first, then wider. Join the waitlist and we'll message you on WhatsApp when your spot opens.
A body in motion stays in motion.
Join the waitlistRunning apps quietly smooth your pace, drop your points, and map your front door. Inertial is built to do the opposite — and to show its work every time.
GPS lies sometimes. When it does, we fix the track — and keep the raw trace right there in grey, on every run. Every dropped point carries a reason. Nothing is smoothed in silence.
Your home stays off the map. A privacy zone hides the 200 m around it from every shared map — on by default, for everyone who isn't you.
Photos lose their location. Location data is stripped from every photo before it leaves your phone.
Plain-language privacy. Every setting explains what it does in one sentence a beginner can read.
You choose who sees each run. 🔒 only you, 👥 followers, or 🌍 everyone — chosen explicitly at sign-up, changeable per run.
Share a beacon before a long run or race. Family opens the link — no account, no app — and sees your live dot, pace, and distance until you're done. The link is an unlisted, random token that expires on its own soon after you finish. And your start point is fuzzed, like every shared map.
Heavy days press deeper. Rest sits light. And your data stays yours.
Join the waitlistWe're letting runners in batch by batch. Leave your number and we'll message you on WhatsApp when your spot opens.
We'll message on WhatsApp when your spot opens.
A body in motion stays in motion. See you soon.