Comparison

Stackr vs PepLog

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Stackr

This app simplifies tracking peptide and GLP-1 doses, including supplies like vials and pens. It offers smart reminders, home screen widgets, and visual charts of estimated active levels based on half-life. Designed for users managing peptide protocols, it keeps your dosing information organized and accessible.

Highlights
  • Log peptide and GLP-1 doses
  • Track vials, pens, and other supplies
  • Smart reminders for next doses
  • Home screen widgets
  • Estimated active level charts
  • Multi-peptide stack tracking
  • Reference pages for common compounds
Features
Read full description

Stackr is the all-in-one tracker for your peptide and GLP-1 protocol. Every dose, vial and meal in one place, with the math done for you. KEY FEATURES • Dose tracking and reminders Log a dose in seconds from your Home screen. Run daily, weekly, every-few-days or specific-day schedules, and several protocols at once. Reminders make sure you never miss a dose, and Home Screen widgets show what's next. • Dose calculator Enter your vial strength, water and dose, and see exactly how many units to draw on a U-100 or U-40 syringe. Works in mcg, mg, IU and units. • Supplies and vials Track vials, pens and other supplies. Stackr counts down what's left every time you log and warns you before you run out. • Progress Keep your weight, progress photos and dose history together, with a calendar of taken and missed doses and estimated active levels from your logs. • Food and calories Snap a meal, scan a barcode, search a food or just say what you ate. Stackr tracks calories and protein against your daily plan. • Stackr Coach Ask the AI coach questions about your routine and your meals, any time. • Learn Reference pages for semaglutide, tirzepatide, retatrutide, BPC-157, TB-500, GHK-Cu and 100+ more, with research status and sources. WHY STACKR • Built for GLP-1s and peptides, from one weekly shot to a full stack • Pounds or kilograms, mcg or mg, U-100 or U-40 • Syncs across your devices when you sign in • Message the team directly from Settings Stackr is a personal tracking and educational app. It does not give medical advice, prescribe treatments or tell you which peptide, dose or schedule is right for you. Always talk to a qualified healthcare professional. Active levels and photo-based nutrition values are estimates. SUBSCRIPTION Stackr is free to download. Full access requires a paid Stackr+ subscription. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel your subscription in your Apple Account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://getstackr.app/privacy

About

PepLog

This app helps users manage peptide protocols by providing a private, on-device logbook. Quickly record doses, track vial usage, monitor consistency with streaks and history, and log weight over time. It also includes a unit converter for precise measurements.

Highlights
  • Log doses in seconds
  • Track vial contents and remaining amounts
  • Monitor logging consistency and history
  • Chart weight over time with goals
  • Unit converter for syringe measurements
  • Private, on-device data storage
Features
Read full description

PepLog is a medication reminder & logbook for people who manage a peptide protocol and want to keep track of their progress & history. It's built around one idea: recording a dose should take seconds, right after you log it, the way a food tracker works. WHAT YOU CAN DO • Log a dose in a couple of taps: amount, time, injection site, and a note • Reconstitution made clear: enter a vial's contents and the water you added, and PepLog derives the concentration and shows you exactly what one dose looks like in syringe units • Track your vials: see how much you have left as you log, and keep every finished vial as a permanent record • Progress photos: capture on a repeatable angle, compare any two side by side, and watch your timeline build over months • See what you've invested: record what a vial cost and PepLog shows your real spend, your cost per logged dose, and how much of what you mixed you've used • Set reminders on your own schedule, with multiple times a day, and log or snooze straight from the notification • See your consistency: a logging streak, badges, a week view, and a history of everything you've recorded • Track your weight and hydration over time, with your own optional goals NEW IN 1.4 PepLog has been rebuilt. Home, Stack, and Stats are redesigned around one idea: the number you came for should already be on screen. One range control now drives every card on Stats. YOUR ACCOUNT, YOUR DEVICE Your PepLog account exists for one reason: so your subscription is recognized on any device you sign in to. Sign in with Apple, Google, or an emailed code. No passwords. Your log itself, your doses, vials, weight, hydration, and progress photos, stays on your device and is not uploaded. PepLog does not ask to track you and does not collect an advertising identifier. You can delete your account at any time in Settings. PEPLOG PRO PepLog is a subscription app. New members choose a yearly plan with a 3 day free trial, or a monthly plan with no trial. Prices are always shown in the app before any purchase, payment is handled by Apple, and you can cancel anytime in your App Store settings. Installed before version 1.2? Your access stays as it was. PepLog is a logging and measurement tool. It does not provide medical advice, dosing recommendations, or treatment guidance, and it does not recommend or endorse any substance. Always consult a qualified healthcare provider before starting, stopping, or changing any regimen. For adults 18+. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Stackr4 screens
PepLog4 screens

Verdict

The call

The clearest difference is in-app purchases: PepLog at none against Stackr's 7. PepLog also leads on review sentiment (100% vs 72%). Stackr's advantage is rating (4.4 vs 4.0) and update cadence (every 4 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Stackr sells 7 in-app purchases, starting at $7.99 per 7 days. PepLog asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Stackr holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: Stackr has 143 ratings behind it against 16, so its average is the more settled of the two. Written reviews complicate that: 72% of Stackr's written reviews are positive against 100% of PepLog's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Stackr ships an update every 4 days, PepLog every 2 weeks. The most recent releases landed on September 30, 2026 and September 22, 2026 respectively.

Scorecard6 real differences · 4 level
Stackr versus PepLog: the parameters behind the verdict, then further details
ParameterStackrPepLog
PriceFreeFree
Rating4.4 (143 ratings) — better4.0 (16 ratings)
Positive reviews72.0% of reviews100.0% of reviews — better
Number of ratings143 — better16
Update frequencyEvery 4 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhoneiPhone, iPad — better
Requires iOS17.017.0
Further details — not scored
Size88 MB27 MB
Age rating12+17+
DeveloperStackr Holdings LLCMoises Olivares

Customer experience

Stackr

All ratings143 ratings
Positive86.7%
Neutral1.4%
Negative11.9%
Written reviews25 reviews
Positive72.0%
Neutral4.0%
Negative24.0%

PepLog

All ratings16 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

7 purchases

Stackr

Subscriptions7
  • Stackr+ Weekly$7.997 Days
  • Monthly$12.991 Month
  • Stackr+ Yearly$29.991 Year
Show 4 more
  • Stackr+ Yearly$49.991 Year
  • Stackr+ Yearly3 Days trial$49.991 Year
  • Stackr+ Yearly$59.991 Year
  • Yearly3 Days trial$69.991 Year
None

PepLog

No in-app purchases

Questions

Is Stackr free?
Stackr is free to download, with in-app purchases available.
Is PepLog free?
PepLog is free to download, with no in-app purchases.
Which has better reviews, Stackr or PepLog?
Stackr is rated higher. Stackr averages 4.4 out of 5 from 143 ratings, while PepLog averages 4.0 from 16 ratings.
Do Stackr or PepLog have ads?
Neither Stackr nor PepLog shows ads.
Which is updated more often, Stackr or PepLog?
Stackr ships an update every 4 days, and PepLog every 2 weeks. Most recently, Stackr was updated on September 30, 2026 and PepLog on September 22, 2026.

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