sextant
The read, for runners.

Your runs, read straight.

Every run in Apple Health gets a plain-English read: what happened, why, and what to change. Every line links to the number it came from.

Long run · 10 mi
You faded at mile 8. Form, not fitness.
Your cadence dropped 6% and your stride shortened. Your heart rate still had room. Your legs gave out before your engine.
CadenceHeart rate
Your heart rate still had room. Your cadence didn't.
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Free iPhone beta. Works with Apple Watch and any watch that syncs to Apple Health.

How it works

One run, start to finish.

Connect Apple Health once. Here’s what happens next, and every time after.

  1. Your history

    Every run you’ve ever logged comes with you.

    Connect Apple Health once and Sextant brings in your runs, back to the first one. That includes the Nike Run Club runs you thought were gone. Your old PRs still count.

    Your runs · 2017 to today
    10K PR · Sep 2018 · Nike Run ClubStill your PR. If an app wrote it to Apple Health, Sextant reads it.

    Then you go for a run.

  2. The read

    Finish a run. Get the read.

    When your watch syncs, Sextant reads the whole run: every rep, your heart rate against your own thresholds, the heat. You get a verdict in plain English, and every line links to the number behind it.

    Intervals · 6 × 800 m
    Six reps, one pace. Add a seventh next week.
    Every rep landed within 2 seconds of 3:20. Your heart rate rose 8 bpm across the set and came back down in every recovery. The set didn’t take you to your limit.
    Rep paceHeart rate
    Your pace held. Your heart rate recovered every time.
    Every line is from your run. Tap to see it.

    Then you ask why.

  3. The coach

    Ask it why.

    Ask about any run, any week, any season. It answers from your runs, not the internet, and shows you what it looked at.

    Why did the last mile feel so hard?
    Coach

    Your pace held, but your heart rate climbed 7% through the back half. It was 84°F and humid, so your body was working to cool itself as well as to run. That was the heat, not your fitness.

    # Heart rate, back half +7%
    # Heat stress (WBGT) 79°F

    On days like this, run by effort, not pace. Keep your heart rate where it sits on a cool day and let the pace slow. It’s the same workout, and the last mile won’t fall apart.

    Ask your coach…

    Then you see where it’s heading.

  4. Over time

    Line it up against every time before.

    The same workout, compared like for like. Your 800s this month next to your 800s in April, so you can see the trend instead of guessing at it.

    800 m reps · 12 sessions · like for like
    AprJunAug
    First3:32
    Season best3:17
    Change−15 s

    And it’s yours to take anywhere.

  5. Your own AI

    Take it to the AI you already use.

    Connect ChatGPT or Claude to Sextant and it reads your real runs, not a screenshot. Same data, same receipts. Your runs, reports, PRs and records are free to connect. Plus connects everything.

    Your AI · ChatGPT or Claude
    How is my training going? Am I OK to run today?
    Used Sextant · 4 lookups ›

    Yes, run today. It’s an easy day on your plan, and you rested yesterday.

    Consistency is good. 8 runs in 2.5 weeks, no gap longer than 3 days.

    Easy days are running a little fast. Slow them down until you can talk in full sentences. Easy days build the base your hard days run on.

Pricing

Start free. Add the coach when you want it.

Pay yearly and get two months free.

Free
$0
Free forever
Everything you’ve ever run.
  • Every run in Apple Health, back to the first one
  • All-time PRs, medals and best efforts
  • Every interval and split, compared over time
  • Coach reads on your first 10 runs
  • Connect ChatGPT or Claude: core tools, 100 calls a day
Get started
Plus
$5/mo
or $50 a year
The coach, on every run.
  • Everything in Free
  • A coach read on every run
  • Ask your coach anything, with a monthly allowance of messages
  • Connect ChatGPT or Claude: every tool
  • Remembers what you tell it, across months
Choose Plus
Recommended
Coach
$10/mo
or $100 a year
A coach that’s read every run.
  • Everything in Plus
  • 5x the coach messages of Plus
  • Training plans built around your goal
Choose Coach
Coach Pro
$20/mo
or $200 a year
A coach that checks in on you.
  • Everything in Coach
  • 15x the coach messages of Plus
  • A weekly check-in: a recap of your week, and plan updates proposed for you to accept or keep
Choose Coach Pro
Questions

Before you run with it.

Is this just ChatGPT for my runs?
It's what you wanted ChatGPT to be for your runs. ChatGPT only sees the screenshot you paste in. Sextant has the context: every run you've logged, every second of each one, your heart rate thresholds, the weather that day, and the plan you're on. Use Sextant's coach, or connect ChatGPT to Sextant and it reads all of that too.
How do I know the read is right?
It shows its work. Every line links to the number it came from. Tap it, check it. No data behind a claim, no claim.
What about my old runs?
If they're in Apple Health, they come with you, back to the first one. That includes runs from apps you no longer use, like Nike Run Club, as long as the app saved them to Apple Health.
Do I need a chest strap?
No, your watch works. A chest strap gives it more to read, so the read gets sharper.
Does it replace my coach?
No. It's a second pair of eyes. With a coach, it reads every run against their plan.
Can I use my own AI?
Yes. Connect ChatGPT or Claude to Sextant and it reads your real runs. Free connects your runs, reports, PRs, records and weekly volume, up to 100 calls a day. Plus and Coach connect everything, including trends over time, your coach history and documents.
What's free?
Your whole run history, all-time PRs and medals, coach reads on your first 10 runs, and connecting ChatGPT or Claude (core tools, 100 calls a day). Plus ($5 a month) adds a coach read on every run and a monthly allowance of messages with your coach. Coach ($10 a month) adds 5x the messages and training plans. Coach Pro ($20 a month) adds 15x the messages and a weekly check-in that recaps your week and proposes plan updates for you to accept or keep.
What about my data?
Never sold. Never used to train models. Export or delete it anytime.

Stop screenshotting. Start reading.

Solo, it’s the read you’d pay a coach for. Your first 10 reads are free.

Get started

Free iPhone beta. Works with Apple Watch and any watch that syncs to Apple Health.