Comparison

PeptidePal vs Stackr

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

Head to head
About

PeptidePal

This app helps users track GLP-1 medications, research peptides, and TRT. It offers a protocol builder, a comprehensive peptide library, and a reconstitution calculator with visual aids. It also includes supply alerts and injection site rotation guidance.

Highlights
  • GLP-1 shot tracking
  • Research peptide tracking
  • TRT tracking
  • Protocol builder
  • Reconstitution calculator
  • Vial inventory & supply alerts
  • Injection site rotation
Features
Read full description

PeptidePal is a peptide and GLP-1 protocol tracker used by over 150,000 people — dose logging, vial inventory, injection site rotation, reconstitution math, scheduling, and a 110+ compound library in one app. Whether you're on a prescribed GLP-1, running your first protocol, or managing several compounds on different schedules, PeptidePal keeps it all in one place. WHY PEPTIDEPAL? ◉ BUILT FOR PROTOCOLS, NOT PILLS: Generic medication apps track one pill, once a day. PeptidePal handles mcg, mg, IU and mL, cycles, on/off weeks, site rotation, and vial lifecycle. ◉ NO DRIFT: Three weeks in, it's easy to lose track of whether you're on day 9 or day 12. PeptidePal keeps the protocol you designed and the protocol you're running the same thing. MAIN FEATURES: ▶ PROTOCOL BUILDER Build from the library or from scratch. Set dose (mcg, mg, IU, mL), frequency (daily, every other day, twice weekly, 5-on/2-off, custom), days, start date, notes, and reminders. Run multiple protocols side by side. ▶ DOSE LOGGING & CALENDAR One tap to log. A week strip and monthly calendar show completed and planned doses, injection site, and time. Streaks keep you consistent. ▶ VIAL INVENTORY & SUPPLY ALERTS Log fill size, concentration, and expiry. PeptidePal projects each vial's run-out date from your live schedule and warns you about a week ahead. ▶ RECONSTITUTION MATH Enter vial size, diluent volume, desired amount, and syringe size. PeptidePal does the mg/mL arithmetic and shows it on a syringe diagram, with an over-capacity warning. Unit conversion only — PeptidePal does not recommend a dose. ▶ INJECTION SITE ROTATION Tap-to-select on an interactive body map, with recently used sites heat-mapped so your rotation is visible at a glance. ▶ COMPOUND LIBRARY 50+ profiles in plain English: mechanism, half-life, research status, reported side effects, and considerations. Every entry states its regulatory status. ▶ PROGRESS & LEVELS Weight and body-composition charts, progress photos with compare and time-lapse, and an estimated on-board level curve from your logged doses. Educational estimate, not a measurement. ▶ AI ADVISOR & COMMUNITY Q&A Short, plain-English answers to educational questions, plus a moderated peer forum. The AI will not recommend a dose, titration, or protocol, and routes medical questions to a provider. You're talking to an AI, not a clinician. Does PeptidePal work with prescribed GLP-1s? Yes — track Ozempic®, Wegovy®, Mounjaro® or Zepbound® with the same scheduling, rotation, and supply tools. Dosing decisions belong with your prescriber. Is my data safe with PeptidePal? Protocol data is stored on your device Progress photos are stripped of metadata before storage Analytics are anonymous — no advertising identifier, no cross-app tracking We do not sell your data or share health information with advertisers Delete your account and all associated data from Settings, in two steps Medical disclaimer PeptidePal is a tracking and educational tool. It does not provide medical advice, diagnosis, or treatment, does not recommend doses or protocols, and is not a substitute for a licensed healthcare provider. Many compounds in the library are not approved by the FDA or other regulators for human use. Always consult a qualified clinician before starting, stopping, or changing anything. 18+ only. SUBSCRIPTION INFO: Free to download. Protocol tracking, the full library, advanced analytics, and AI chat require a subscription. Prices are shown in the app and charged to your Apple ID at confirmation of purchase. Renews automatically unless auto-renew is turned off at least 24 hours before the period ends. Manage or cancel anytime in App Store account settings. Terms: https://peptidepal.health/terms Privacy: https://peptidepal.health/privacy Trademarks are property of their respective owners. PeptidePal is not affiliated with or endorsed by any pharmaceutical manufacturer.

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

Screenshots

PeptidePal4 screens
Stackr4 screens

Verdict

The call

The clearest difference is review sentiment: Stackr at 72% against PeptidePal's 30%. Stackr also leads on ads (none vs shown). PeptidePal's advantage is rating (4.7 vs 4.4) and ratings volume (4.7K vs 143). On price, update cadence, in-app purchases and monetization model 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. PeptidePal sells 17 in-app purchases, starting at $3.99 per 7 days and Stackr sells 7 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

PeptidePal holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: PeptidePal has 4.7K ratings behind it against 143, so its average is the more settled of the two. Written reviews complicate that: 30% of PeptidePal's written reviews are positive against 72% of Stackr's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

PeptidePal ships an update every 5 days, Stackr every 4 days. Both last shipped on September 30, 2026.

Scorecard5 real differences · 6 level
PeptidePal versus Stackr: the parameters behind the verdict, then further details
ParameterPeptidePalStackr
PriceFreeFree
Rating4.7 (4.7K ratings) — better4.4 (143 ratings)
Positive reviews30.0% of reviews72.0% of reviews — better
Number of ratings4.7K — better143
Update frequencyEvery 5 daysEvery 4 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
Best chart rank#92 — better—
DevicesiPhoneiPhone
Requires iOS18.017.0 — better
Further details — not scored
Size102 MB88 MB
Age rating12+12+
DeveloperBlank Labs LLCStackr Holdings LLC

Customer experience

PeptidePal

All ratings4,675 ratings
Positive91.9%
Neutral4.3%
Negative3.8%
Written reviews140 reviews
Positive30.0%
Neutral7.1%
Negative62.9%

Stackr

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

In-app purchases

17 purchases

PeptidePal

Subscriptions17
  • PeptidePal – Weekly$3.997 Days
  • PeptidePal – Weekly$4.997 Days
  • PeptidePal – Monthly2 variants$8.991 Month
Show 14 more
  • PeptidePal – Monthly$9.991 Month
  • PeptidePal – Monthly$11.991 Month
  • PeptidePal – Monthly$12.991 Month
  • PeptidePal – Monthly$14.991 Month
  • PeptidePal – Monthly$19.991 Month
  • PeptidePal – Quarterly$29.993 Months
  • PeptidePal – Yearly$29.991 Year
  • PeptidePal – Yearly$35.991 Year
  • PeptidePal – Yearly3 Days trial$35.991 Year
  • PeptidePal – Yearly3 Days trial$39.991 Year
  • PeptidePal – Yearly$39.991 Year
  • PeptidePal – Yearly$44.991 Year
  • PeptidePal – Yearly$59.991 Year
  • PeptidePal – Yearly$79.991 Year
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

Questions

Is PeptidePal free?
PeptidePal is free to download, with in-app purchases available.
Is Stackr free?
Stackr is free to download, with in-app purchases available.
Which has better reviews, PeptidePal or Stackr?
PeptidePal is rated higher. PeptidePal averages 4.7 out of 5 from 4.7K ratings, while Stackr averages 4.4 from 143 ratings.
Do PeptidePal or Stackr have ads?
PeptidePal shows ads; Stackr does not.
Which is updated more often, PeptidePal or Stackr?
PeptidePal ships an update every 5 days, and Stackr every 4 days. Most recently, PeptidePal was updated on September 30, 2026 and Stackr on September 30, 2026.

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