Comparison

TestMax vs Stack

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

Head to head
About

TestMax

This app helps men optimize their testosterone levels and enhance masculinity through personalized plans based on lifestyle questions and AI analysis. It offers science-backed exercises, nutrition, and lifestyle changes to boost confidence and energy.

Highlights
  • Personalized lifestyle plans
  • AI-powered selfie analysis
  • Science-backed exercises
  • Nutrition guidance
  • Lifestyle change recommendations
  • AI coaching
Read full description

HOW TO USE TESTMAX: 1) Answer lifestyle questions to build your plan 2) Take a selfie 3) Get your analysis* If you want to maximize your testosterone and become more masculine, TestMax will help you get there faster naturally than anybody else. We believe every man deserves to feel confident, energetic, and masculine, but you have to work hard. We will provide you with the tools and information to begin your testmaxxing journey. We are currently helping men maximize their testosterone through science-backed exercises, nutrition, lifestyle changes, and AI-powered coaching, but we are expanding soon! If you have any ideas or questions, please email us at hello@testmaxai.app We are the testosterone optimization AI tool to help YOU maximize your masculine potential. NOTE: Our selfie analysis is AI-powered and provides an estimate based on visual indicators and is not 100% accurate. It is NOT a substitute for medical blood tests. We do not offer medical advice. Any recommendations should be viewed as suggestions. Please consult with a healthcare professional and do your own research before starting any new exercise, nutrition, or supplement program. *Analysis results require subscription TERMS: https://www.testmaxai.app/terms

About

Stack

Features
Read full description

Stack is the all-in-one tracker for peptides, GLP-1 medications, and TRT protocols. Log every injection, build custom dosing schedules, track your progress, and keep your full history organized in one private place. Built for adults working with a prescribing healthcare provider, Stack replaces scattered notes and spreadsheets with a simple, consistent system you control. You enter your own values (peptide name, dose, schedule, and sites) and Stack keeps them organized, reminds you, and shows your progress over time. FEATURES • Custom Protocols & Stacks — Build your own multi-peptide protocols with flexible schedules (daily, weekly, every X days, or custom). Run multiple stacks at once, each clearly organized. • Smart Dose Logging — Log every injection in seconds and see what's due today on your Home screen and calendar. A daily streak keeps you consistent. • Reconstitution Calculator — Take the guesswork out of mixing. Enter vial amount, diluent volume, and target dose to get the exact mL or insulin-syringe units to draw. • Vial & Refill Tracking — Set how much each vial holds, watch it deplete with every dose, and refill in one tap. A tap-to-flip ring shows the exact percentage remaining. • Injection Site Tracker — Rotate sites with an interactive body map that remembers your recent spots, so you can avoid reusing the same area. • Apple Health Sync — Pull in weight, BMI, resting heart rate, HRV, sleep, steps, active energy, blood pressure, respiratory rate, body fat, lean mass, and VO2 max to see the full picture. • Progress Photos & Compare — Capture progress photos and view them side by side with weight and date overlays. Hide weight for privacy, then share a branded comparison. • Meal Scan — Snap a photo of your meal to estimate macros and keep nutrition alongside your protocol. • AI Assistant — Ask questions about your active stacks and protocols in a private chat built into the app. • Metrics & Insights — Clean charts and stats show how your protocol is trending over time. • Home Screen Widget — See your next dose and stay on track without opening the app. • Shareable Protocol Card — Generate a clean, branded card of your active protocol to save or share. PRICING Stack requires a subscription to unlock the full experience. IMPORTANT Stack is a personal record-keeping and organization tool for informational purposes only. It does not provide medical advice, diagnosis, or treatment, and is not a substitute for professional care. Always consult a qualified healthcare provider before starting, changing, or stopping any medication or protocol. Terms of Use (EULA): https://www.whatsyourstack.app/terms.html Privacy Policy: https://www.whatsyourstack.app/privacy.html Questions or feedback? Email us at contact@whatsyourstack.app.

Screenshots

TestMax4 screens
Stack4 screens

Verdict

The call

TestMax and Stack are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. TestMax sells 4 in-app purchases, starting at $3.99 per 7 days and Stack sells 2 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

TestMax ships an update every 2 weeks, Stack every 8 days. The most recent releases landed on September 13, 2026 and September 14, 2026 respectively.

ScorecardNo meaningful differences
TestMax versus Stack: the parameters behind the verdict, then further details
ParameterTestMaxStack
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 2 weeksEvery 8 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPad — better
Requires iOS17.0 — better18.0
Further details — not scored
Size84 MB136 MB
Age rating17+17+
DeveloperJoshua ClarkAmari Thomas

In-app purchases

4 purchases

TestMax

Subscriptions4
  • TestMax Unlimited (weekly)$3.997 Days
  • TestMax Pro - weekly$6.997 Days
  • TestMax Pro - yearly$26.991 Year
Show 1 more
  • TestMax Pro - Yearly (Referral)7 Days trial$26.991 Year
2 purchases

Stack

Subscriptions2
  • Stack Weekly$9.997 Days
  • Stack Yearly$49.991 Year

Questions

Is TestMax free?
TestMax is free to download, with in-app purchases available.
Is Stack free?
Stack is free to download, with in-app purchases available.
Do TestMax or Stack have ads?
Neither TestMax nor Stack shows ads.
Which is updated more often, TestMax or Stack?
TestMax ships an update every 2 weeks, and Stack every 8 days. Most recently, TestMax was updated on September 13, 2026 and Stack on September 14, 2026.

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