Peptide and GLP-1 tracker for iPhone
Every dose,on the record.
Log a dose in two taps, know what's left in each vial, and compare your sleep before and after a change. Your records stay on your iPhone.
$79.99 once, no renewals.
Or $49.99 a year, 7 days free for new subscribers.
Example screens with fictional records. Not dosing instructions.
- Never suggests a dose
- Never sells peptides
- No account
- Records stay on your iPhone
- No ad trackers
Today tab
Log a dose in two taps.
- Log, snooze or skip straight from the reminder, without opening the app.
- The body map shows how long each site has rested and points to the next one in your own rotation.
- Logged the wrong one? Undo puts everything back, vial count included.
- The lock screen says “Dose due” and nothing more, unless you choose to show the name.
Protocols tab
Know what's left in every vial.
- Each logged dose counts down the vial, in the label's own units.
- An estimated last dose, worked out from what's left and your schedule, and labeled as an estimate.
- Mixed date, discard-by date, lot and cost in one place, all from what you entered.
- Save a units-to-draw note from your label or prescriber. It shows next to the dose.
Progress tab
See what changed.
Peptiday lines up your Apple Health data from the two weeks before a protocol change against the two weeks after. You see the difference, how many nights back it up, and when it's too small to call.
- Both date windows, every night, and how many had data.
- A plain verdict: a clear difference, or within your usual swing.
- What else changed in the same window, so you don't credit the wrong thing. Observed, never proof of cause.
From Apple Health, only what you pick
Peptiday never writes to Health. Oura and WHOOP data that syncs to Health works too.
- Sleep(on)
- HRV(on)
- Resting heart rate(on)
- Steps(off)
- Weight(on)
Before · Oct 8 – Oct 21
6h 46m
12 of 14 nights with data
After · Oct 22 – Nov 4
7h 10m
11 of 14 nights with data
Each dot is one night. Dashed lines are medians. Hollow dots had no Apple Watch data.
| Oct 8 | 6h 42m |
|---|---|
| Oct 9 | 6h 55m |
| Oct 10 | 6h 38m |
| Oct 11 | No data |
| Oct 12 | 7h 10m |
| Oct 13 | 6h 28m |
| Oct 14 | 7h 00m |
| Oct 15 | 6h 45m |
| Oct 16 | No data |
| Oct 17 | 6h 52m |
| Oct 18 | 6h 35m |
| Oct 19 | 6h 47m |
| Oct 20 | 6h 41m |
| Oct 21 | 6h 58m |
| Oct 22 | 7h 05m |
| Oct 23 | 7h 18m |
| Oct 24 | No data |
| Oct 25 | 6h 59m |
| Oct 26 | 7h 27m |
| Oct 27 | 7h 10m |
| Oct 28 | No data |
| Oct 29 | 6h 52m |
| Oct 30 | 7h 31m |
| Oct 31 | 7h 08m |
| Nov 1 | No data |
| Nov 2 | 7h 13m |
| Nov 3 | 7h 21m |
| Nov 4 | 7h 00m |
Also changed in this window
- Tirzepatide changed on Nov 2
- Data gaps: 2 days before, 3 after
This shows what changed, not why.
EXAMPLESample data. The apricot line marks the day a protocol started.
Progress tab
Why a weekly dose builds up.
- See how each logged dose adds to what's left of the last, as a share of where your current dose levels off.
- Drawn today for tirzepatide and semaglutide, from the half-lives on their FDA labels. Tirzepatide's is 5 days.
- A shaded band shows the same curve with a shorter and a longer half-life. Every number is labeled as an estimate, never a blood test.
Learn tab
Know how strong the evidence is.
The library covers 34 peptides and GLP-1 medicines. Each claim is graded by the kind of study behind it, from cells in a dish to trials in people, and links to that study.
Browse the libraryPricing
Pay once, or start with 7 days free.
Every plan unlocks everything. No hidden prices: the App Store shows the price before you confirm.
Best value
Lifetime
Pay once. No renewals, and every update included.
$79.99once
Cheaper than yearly from your second year
- Log doses in two taps, with reminders
- Vial counts and site rotation for every compound
- Before-and-after comparisons for sleep, HRV, resting heart rate, steps and weight
- Estimated levels, the full library and lessons
- Your whole dose history, with CSV export
Yearly
7 days free · $4.17 a month
$49.99a year
New subscribers get 7 days free, then it's billed yearly. Cancel before the trial ends and you aren't charged.
Monthly
$9.99a month
Billed monthly. Cancel anytime.
US prices shown. The App Store shows the price for your region. Billed by Apple. Subscriptions renew automatically until you cancel in your App Store settings. If a subscription ends, your history stays readable and exportable, and the reminders you scheduled stay on.
Prices apply from launch.
Questions
Something else? Visit support.
Does Peptiday tell me how much to take?
No. Amounts start empty and you enter what your prescription or label says. Peptiday never suggests a dose, compares your dose with anyone else's or tells you to start, stop or catch up.
Is there a reconstitution calculator?
No. Peptiday records your instructions instead of calculating them. You can save a units-to-draw note from your label or prescriber, and it shows on your Today card next to the dose.
Where are my records stored?
On your iPhone. There's no account and no Peptiday server holding your doses. You can export your doses and skips as a CSV at any time.
Does it work with Apple Health, Oura or WHOOP?
Peptiday reads the Apple Health data you choose: sleep, HRV, resting heart rate, steps and weight. If your Oura or WHOOP writes to Apple Health, Peptiday reads that data too. It never writes to Health.
When can I download Peptiday?
Peptiday is in testing now and coming to the App Store for iPhone. Tap “Email me at launch”, send the email it opens, and we'll write once when it's live.
Which peptides can I track?
Anything you take. The library covers 34 peptides and GLP-1 medicines, including tirzepatide, semaglutide, retatrutide, BPC-157, TB-500 and GHK-Cu. Anything else, you can add yourself.
What does Peptiday cost?
$79.99 once for lifetime access, $49.99 a year ($4.17 a month, with a 7-day free trial for new subscribers), or $9.99 a month, in US dollars. Every plan unlocks everything. There's no free plan.
What happens if I stop paying?
Your records stay on your iPhone. You can still read your history and export it as a CSV. Reminders you already scheduled stay on while notifications are allowed, and you can log or skip a dose from one. Logging in the app, comparisons and adding compounds wait until you choose a plan again. Lifetime has no renewals, so it never lapses.
Is Peptiday on Android?
Not yet. Peptiday is built for iPhone and Apple Health.
Be there on day one.
Peptiday is in testing now. Get one email when it's on the App Store, then add what you take and log your first dose. No account needed.