The private logbook for GLP-1 and peptides

Reko is an iPhone app for recording every shot and dose, the site it went into, and what happened after. Weight, side effects, food, sleep, labs and cycle in one place, with your record kept on your phone.

Download on theApp Store
5.0·No account needed
The day screen with a logged dose, symptoms, water, nutrition and weight
Semaglutide0.5 mg 8:00 AM
Water87%56 of 64 fl oz
Weight195.3 lb
Estimated medication level over six weeks
Estimated right now0.6 mg
Last dose peaksin 2 days
Half-lifeabout 7 days
Weight trend with recent entries
Since you started−8.4 lb
Latest195.3 lb
Protein, fiber and water against targets
Protein88 of 100 g
Fiber21 of 30 g
Water56 of 64 fl oz
Symptom timeline with recent entries
Nausea todayBarely 8:30 AM
Today on the log2 of 10 nausea
Reconstitution calculator with a U-100 syringe
Vial size5 mg
On the syringe10 units
Which is0.1 mL

Example record

One app for every dose and what comes after

Doses

Amount, time and site in a few taps.

The day screen with a logged dose

Side effects

Beside your doses, so you can see patterns.

Symptom timeline

Estimated level

From your own doses and the published half-life. An estimate, not a blood test.

Estimated level chart

Weight and body

The trend, not every up and down.

Weight trend

Food, water, sleep, fasting

Your whole day in one place, against targets you set yourself.

Symptoms, water, nutrition, weight, sleep and fasting on the day screen

Vials and the calculator

What is left, counted down as you log, and syringe units from your numbers.

Reconstitution calculator

Real screens from the app, showing an example record.

How Reko helps you keep your record straight

01

Log every dose, and where it went

Record the amount, time and injection site in a few taps. A body map shows which sites you used recently, so you can rotate them. Schedules cover weekly shots, daily doses, step-up titrations and on/off cycles. By default, reminders leave your medication's name off the lock screen.

See the logbook →
Body map of injection sites
02

See an estimate of what is in your system

Reko draws an estimated level from your own doses and each compound's published half-life, so you can read the rise and fall between injections. It is an estimate, and it says so.

Estimated level over time
03

Watch side effects next to your doses

Log nausea, tiredness, bloating and the rest the day they happen, then look at them beside your dose history. Bring a clear picture to your next appointment.

See side effects beside doses →
Symptom timeline beside injections
04

Vials, pens and the arithmetic

Track what is left in each vial as you log. The reconstitution calculator turns what is in the vial and the water you add into syringe units to draw, and warns you when a draw falls between your syringe's markings. You decide the dose; Reko only does the arithmetic on your numbers.

Reconstitution calculator
05

Weight, food, sleep, labs and cycle

Follow your weight over time, log protein, water and food, add sleep and training, and read what you allow from Apple Health. Scan a printed lab report and check every value before it is saved. Cycle tracking sits beside your doses and is never uploaded.

See everything Reko tracks →
Weight over time

Free guides and tools

Plain-language guides and small free tools. No sign-up.

GuidePeptide glossaryPlain definitions, and which compounds are approved.GuideGLP-1 side effectsHow common each one is, what experts suggest, and when to call.ToolProtein and water estimateYour daily range, with the source shown.GuideHow long does a GLP-1 take to work?What the trials show week by week, and what to record.GuideUnderstanding your estimated levelsHalf-life, steady state and what the curve can and cannot tell you.ToolReconstitution calculatorConcentration and syringe units for a vial you mix.

High-protein recipes

Small meals for a smaller appetite, with the protein per serving on every one.

31 g proteinChicken and quinoa bowl286 kcal · 30 min26 g proteinChicken and rice soup218 kcal · 30 min24 g proteinProtein overnight oats with prunes360 kcal · 5 minFree PDFGet all 23 recipesThe whole collection, ready for the kitchen.

Why people choose Reko

Correct numbers

One number reader across the app, and anything read from a photo or a file is shown back to you before it is saved.

Private by default

No account needed. Your record stays on your iPhone unless you turn backup on. Reko never uploads Apple Health data or cycle entries. Your phone's own iCloud or computer backup includes them, as it does for every app.

Nothing to sell you

Reko recommends nothing, sells nothing and suggests no doses. The price is on this page, not sprung on you after setup.

Common questions

What is the best way to track GLP-1 injections?

Write down the date, time, dose and injection site every time, and note how you feel afterwards. A GLP-1 tracker app like Reko keeps all of it in one record, with a body map so you can see which sites you used recently.

Which medicines can I track in Reko?

You choose the medicine you take, for example semaglutide (Ozempic, Wegovy) or tirzepatide (Mounjaro, Zepbound), and Reko also covers retatrutide, liraglutide and peptides. The full list has 55 compounds, each with its own units and a plain regulatory status.

Does Reko tell me what dose to take?

No. Reko records what you and whoever prescribed or supplied it decide. It is not medical advice.

Does it track injection sites and rotation?

Yes. A body map shows the sites you used recently.

Can it remind me when a dose is due?

Yes, and by default the reminder leaves your medication's name off the lock screen.

Can I track vials, pens and compounded semaglutide or tirzepatide?

Yes. Reko tracks vials and pens as a supply, counts down what is left as you log, and shows the clicks to dial on a pen. For a vial, the reconstitution calculator turns what is in the vial and the water you add into syringe units. See the GLP-1 vial tracker.

Can I track side effects next to my doses?

Yes. Pick a symptom from the suggestions or write your own, note how strong it was, and it appears on the same timeline as your doses. See GLP-1 side effects for what the labels and expert groups say.

What if I take a dose late?

Set the actual date and time you took it, and Reko keeps your schedule and record accurate. The missed dose guide shows what each U.S. label says about a missed Mounjaro, Zepbound, Ozempic or Wegovy dose.

Does Reko help me lose weight?

Reko does not promise weight loss or change what your medicine does. It records your doses, weight and how you feel, so you can see the pattern and bring it to your care team.

Does it work with Apple Health?

If you allow it, Reko reads weight, food, sleep and workouts from Apple Health so you type less. What it reads stays on your phone.

Where is my data?

On your iPhone. If you turn backup on, doses and notes are stored on servers in the EU. Cycle entries are never uploaded.

Is Reko free?

No. It is a paid subscription, and you can open every screen with an example record before you pay. The calculators on this site are free and need no sign-up. See is Reko free.

Is there an Android version?

Not yet. Reko runs on iPhone and iPad, with an Apple Watch complication and a home-screen widget.

Your record, in one private place

Open every screen with an example record before you pay.

Download on theApp Store
RekoFor iPhone and iPadDownload