Stop guessing. Start measuring.
Lose the weight. Keep the muscle. Watch the numbers. The peptide tracker built for body composition, bloodwork, and the cohort that keeps you honest — on Mounjaro, Ozempic, Wegovy, Zepbound, or compounded peptides.
Progress
Track, trend, compare. Inputs live in Tools.
Pictured: Cohort+ analytics (lean mass, body composition, cohort percentile). Free covers shot logging, weight, journals, and basic cohort matching.
Built for your protocol
Mounjaro, Ozempic, Wegovy, Zepbound, compounded — each with its own dose schedule, phase math, and taper curve. Not "generic weight loss."
Compared to your cohort
Not Reddit anecdotes. The real distribution of where people on your medication, your dose, and your week actually land. You see where you sit on the curve.
A decision tool, not a diary
Phase rings, taper readiness, lean-mass preservation, off-ramp triggers. You don't log shots to remember them — you log them so Cohort can tell you what to do next.
No ads. No data sales. Ever.
We sell software, not your bloodwork. Free tier never gets walled off, Cohort+ never sees ads, and your data isn't a product anywhere on the back end.
YOUR DASHBOARD
Every number that matters,
in one place.
Phase, adherence, body composition, off-ramp readiness, lab markers, recon math, and the cohort feed — all wired together.
Peptide tracking apps treat you like every other patient. You're not.
MyFitnessPal doesn't know what week 9 of Mounjaro looks like. Calorie counters were built for a different problem. The food noise question they can't answer is the only one that matters.
Your provider sees you for twelve minutes a quarter. Long enough to renew the prescription. Not long enough to catch a stall, a side-effect drift, or whether your body comp is moving the right direction.
Reddit is loud. But you can't tell who's actually fourteen weeks in on 5mg. Anecdotes from the loudest poster aren't a cohort. They're a story. You need the distribution.
Most peptide apps are diaries. Cohort is something else.
Every shot, every site, unlimited. Phase tracking, side-effect logging, and dose history.
Log it, chart it, see your trend line cut through the noise. Cohort overlay included.
Launch · Rise · Peak · Cruise · Taper · Pre-Shot. Named phases, live countdown.
A pharmacokinetic curve based on your medication's half-life. The science behind the phases.
Posts, comments, follows. Filter the feed by your dose, your week. Real people, real numbers.
Write the why before the outcome. Auto-prompted on dose changes and goal shifts — so the story doesn't rewrite itself later.
Eight questions every Sunday. Your answers stay private; the cohort's aggregated patterns come back Monday.
Every Sunday: your week in numbers — shots, weight, side effects, mood. One tap to read, one tap to share with your prescriber.
See where you fall on the same dose, in the same week.
This is the difference. Personal trackers tell you what you did. Cohort tells you what people exactly like you — same medication, same dose, same week — actually experienced. Filter by sex, age band, side effects, even starting BMI. The honest answer to "is this normal?", backed by real data.
Weight loss · Week 9
Built from day one for compound users.
Recon calculator. Vial tracker. BAC water log. BUD tracking. If you've reconstituted a vial at midnight, eyeballed your unit count on a U-100 syringe, or wondered when your pharmacy's beyond-use date hits — we built this for you. Most peptide apps treat compound as an afterthought. We designed for it from day one.
And we'll never sell you medications. We're a tracker — that's it. No telehealth pivot. No pharmacy integration. No "personalized prescription" funnel quietly rolled out in a future update.
Reconstitution
Vial Inventory
Know exactly where you are between shots.
Launch → Rise → Peak → Cruise → Taper → Pre-Shot. Six named phases, mapped to the actual pharmacokinetics of your medication. A live countdown to your next dose. Suddenly the late-week appetite return makes sense — you're not failing, you're in Taper.
MOUNJARO 5MG SHOT DAY
WEDNESDAY CYCLE DAY
4 OF 7 NEXT DOSE
3D 14H 22M
Every Sunday, a named report. Your week, told back to you.
Not a CSV export. A story. Your stats, your check-in trends, your cohort ranking, the side effects that stuck and the ones that faded. Week 9. Week 12. Week 24. Each one named, archived, and ready when you want to look back at where you were.
The Whoosh Week
Energy · M T W T F S S
A feed where every post
comes with a week number.
Not influencers. Not before-and-after grift. Real people, real weeks, real numbers. Filter the feed by your dose, your week, your medication — and read what people felt, lost, gained, struggled with. The community is the value. We just make it findable.
Before
After
Halfway there. The first three months were brutal — nausea, fatigue, the food noise didn't stop until week 9. Now? Quiet. Almost too quiet.
Four more things most peptide apps miss.
Quiet differentiators most users don't discover until week three. All included in Free. All built because the existing tools didn't.
An anonymous pair on your exact protocol.
Opt in once. Cohort matches you with one other person on the same peptide, in the same phase, with the same goal. Weekly check-ins. Anonymous handles only — no DMs leak outside the app, no real names ever shown. The thing Reddit can't be because it's too loud.
Every dose change, with the reason you made it.
Each protocol shift — dose bump, food change, sleep intervention — gets one line of "why." Six months in, you have a single document that explains every meaningful inflection in your weight, side effects, and labs. Nothing else in this space records the why.
See why you sleep worse the night after a shot.
Connect Apple Health or Oura and your sleep duration + efficiency overlays onto your protocol calendar. Most users find shot-night-plus-one is consistently 30–60 minutes shorter. Naming the pattern is half of fixing it.
Aggregated weekly outcomes — your cohort, not Reddit.
Median weekly weight change by phase × peptide family, with a 30-user minimum per cell so cohort stats never reveal patterns tied to fewer than 30 real users. Set expectations from real cohort data instead of Reddit anecdotes. Cells below the floor stay hidden until the population catches up.
Cohort+ — the metrics that decide how you age.
The eight features above are everything you need to track the peptide journey itself — and they stay free forever. Cohort+ is a different layer: the slow-moving longevity metrics that decide whether you keep the muscle, what your bloodwork is doing under the surface, and how your cardiovascular age is tracking. Body composition. Sixteen lab markers. Cardio age. The numbers your doctor wishes you brought in.
Don't just lose weight. Keep what matters.
Body composition tracking — lean mass, body fat %, body water. Smart-scale data via Apple Health (Renpho, Withings, Eufy) or manual entry. Especially critical on GLP-1s, where losing muscle alongside the fat is the trap nobody talks about.
Sixteen markers. Plain English.
16 markers across atherogenic, metabolic, liver, kidney, and thyroid panels — ApoB, A1c, LDL, ALT/AST, fasting insulin, TSH and more. Each with optimal/borderline banding so you see at a glance what's drifting.
The longevity number people actually want.
HRV (SDNN), resting heart rate, and VO₂ max from Apple Watch combine into a single number — your cardiovascular age vs. your chronological age. The longevity metric that actually drives behavior.
Every reading, in light of your protocol.
Each lab value gets a protocol-aware annotation, not a generic reference range. "Mild ALT bump — common in loading. Re-test in 6 weeks." The interpretation a peptide-literate clinician would write in the margin.
Weight history, annotated by your protocol.
Shot tick marks along the bottom edge. Dose-change vertical lines marked directly on the chart. Stalls and whoosh weeks line up against what you actually did — not just what the scale said.
Your drug level, across every shot.
A multi-shot drug-level curve in Shot History with trough-window analysis. See when you're actually at steady state, when troughs are getting too low, and how dose timing is shaping the curve.
Health data is dangerous in the wrong hands. We know whose hands.
Peptide users live with a particular kind of awareness — that this data, in the wrong database, becomes an underwriting decision, a premium hike, a denial. We've also watched this category do exactly the wrong things: paywall what was free, sell pharmacy services to captive subscribers, refuse cancellations. So we built the product around three commitments. Not aspirations. Architecture.
We never sell your health data.
Not to insurers. Not to data brokers. Not to advertisers. Not to "research partners." Not via "opt-out anonymous analytics" added to a release notes popup. We do publish anonymized cohort statistics — only at the segment level (5+ users per bucket, never tied to a handle) — and that's the only data of yours that ever shows up in public copy. Subscriptions paid by you are the only revenue model.
Your photos are encrypted and only yours.
Progress photos — the most sensitive thing you'll ever take of yourself — are encrypted at rest, served via short-lived signed URLs, and scoped to your account. Only you can see them. We never share them, never use them for training, never ship them outside Cohort.
Delete everything, any time.
One tap. In-app. No support tickets. No "we kept charging after you canceled" emails. We hold the data for 30 days (the recovery window for accidental taps) and then it's gone — backups included. Full instructions and what we keep (anonymized aggregates only) live on our privacy page.
Things people ask before they download.
Is this a replacement for my doctor?
Do you sell my data?
Does Cohort work with compounded peptides?
Does it sync with Apple Health?
Can I cancel or pause Cohort+?
Is there a web version?
What about refunds?
What happens if I delete my account?
Not influencers. Just people on the protocol.
Every quote is from a real Cohort member, used with permission. Anonymous handles only — that's the whole posture.
“I'd been logging weight in Apple Health for six months and still didn't know if my dose was working. Two weeks in Cohort and the trend was obvious. The dose step-up timing changed everything.”
“My prescriber asked for ‘a summary of how the last three months went’ before adjusting my dose. I handed him the Cohort+ monthly report. He skimmed it for thirty seconds and approved the change.”
“The cohort feed is the only place I've seen people talk about the week-eight stall honestly. Reddit is a lot. This is just people on the same arc as me, posting what worked.”
Start measuring.
People on the same medications, doses, and protocol weeks as you are already logging. The honest answer to "is this normal?" shows up after a few weeks of data — yours, and theirs.