Comparison

PepSync vs Vial

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

Head to head
About

PepSync

Read full description

Know exactly what to draw. PepSync turns the numbers on your vial label amount, water, syringe into one clear answer: the units to draw to. Then it keeps the books: what's left in every vial, when each one should be discarded, and the schedule you built for yourself. No spreadsheet. No napkin math. No squinting at tick marks. ALL-NEW IN 2.0 Version 2 is a complete redesign a ground-up UI overhaul built around one idea: the answer comes first. A cleaner dark interface, a streamlined four-tab layout with a quick-add button always under your thumb, and every number you'd act on rendered in crisp monospace. Faster to read at 7 AM, faster to log, easier to trust. THE CALCULATOR - Answer-first: the draw-to units stay pinned while you adjust inputs - Clean-mark check: if your numbers land between syringe marks, PepSync suggests the water amount that fixes it - Show Math: every step of the calculation in plain English — verify anything - Blend support: multi-component vials with per-draw breakdowns - Reverse calc, water calc, unit converter (mcg / mg / mL / IU / units), and titration tools VIALS THAT COUNT THEMSELVES - Log an entry and the vial's remaining count ticks down automatically - Discard countdown runs from your reconstitution date - Projected-empty date tells you in advance whether you'll finish a vial before its discard day - Multiple vials of the same compound? One wears the "in use" badge logging just works - Optional cost tracking per vial SCHEDULES YOU AUTHOR - Build simple daily plans or staged ones — step changes, on/off phases, multiple compounds — entirely from your own entries - "Up next" shows what you scheduled, when, with your rotation site - Missed an entry? It's recorded honestly. Plans never shift and never double up - Optional reminders that respect your privacy: lock-screen text is discreet by default YOURS ALONE - Local-first by architecture: no account, no server, no analytics, no cloud copy - Your data lives in a database on your iPhone — the only way it leaves is you tapping Export - Full backup and restore: one file, readable, yours - Filterable history with CSV export ONE-TIME PURCHASE Pay once, own it. No subscription. Restore anytime on your Apple ID. PepSync is a calculation and record-keeping utility. All compounds, amounts, and schedules are entered by you; the app performs unit math on your numbers and organizes your records. It does not provide dosing recommendations, protocols, or medical advice. For research and educational purposes only. Consult a qualified professional for health decisions.

About

Vial

This app helps you precisely manage peptide protocols by tracking inventory, logging doses, and modeling compound levels in your body over time. It also includes a wellness journal, lab result tracking, and body composition logging.

Highlights
  • Track peptide inventory and remaining amounts
  • Log doses with automatic inventory updates
  • Model compound levels in the body over time
  • Analyze dose frequency and intake trends
  • Journal mood, energy, and side effects
  • Store and track lab results and body composition
  • Reconstitution calculator for precise concentrations
  • Low inventory alerts
Features
Read full description

Vial — Peptide Tracker The most complete peptide tracking app for iOS. Vial helps you manage your protocol with precision — tracking inventory, logging doses, and modeling how compounds move through your body over time. TRACK YOUR PROTOCOL Add any peptide with its vial size, reconstitution volume, and pharmacokinetic parameters. Vial calculates your exact concentration, tracks how much is remaining, and estimates how many days until you run out. LOG DOSES IN SECONDS A floating log button is always within reach. Choose from common dose presets or enter a custom amount, pick your injection site, and you're done. Your inventory updates automatically. SEE YOUR BLOOD LEVELS Vial's pharmacokinetic engine models estimated compound levels in your system over time, based on each peptide's half-life and time to peak. See when levels rise, peak, and decline — all in a clean, interactive chart. UNDERSTAND YOUR TRENDS The Insights tab shows your dose frequency, cumulative intake per peptide, and patterns across 7, 14, 30, and 90-day windows. Tap any bar in the chart to see exactly what you dosed that day. WELLNESS JOURNAL Log mood, energy, nutrition, and side effects alongside your protocol. Spot patterns between how you dose and how you feel. LAB RESULTS Store and track your blood work over time. Keep your protocol and your biomarkers in one place. BODY COMPOSITION Log weight, body fat percentage, and lean mass. Watch your body composition trend alongside your protocol on a built-in chart. RECONSTITUTION CALCULATOR Enter your vial size and BAC water volume — Vial instantly calculates the exact concentration so you always draw the right amount. HOME SCREEN WIDGET Check your inventory and dose status without opening the app. APPLE HEALTH SYNC Write weight and body composition data directly to Apple Health. LOW INVENTORY ALERTS Get notified when a vial is running low so you're never caught off guard mid-protocol. Vial is for personal tracking purposes only and is not a medical device. Estimated blood levels are mathematical approximations based on population pharmacokinetic models, not clinical measurements. Nothing in this app constitutes medical advice. Always consult a licensed healthcare professional before making any health or dosing decisions. **For support or feedback support@vial-app.com Privacy: https://vial-app.com/privacy TOS: https://vial-app.com/terms

Screenshots

PepSync4 screens
Vial4 screens

Verdict

The call

The clearest difference is update cadence: Vial at every 3 days against PepSync's every 3 weeks. On price, ads, in-app purchases and device support 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. PepSync sells 1 one-off in-app purchase and Vial sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

PepSync ships an update every 3 weeks, Vial every 3 days. The most recent releases landed on October 1, 2026 and October 6, 2026 respectively.

Scorecard1 real difference · 9 level
PepSync versus Vial: the parameters behind the verdict, then further details
ParameterPepSyncVial
PriceFreeFree
Rating—3.7 (3 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—3 — better
Update frequencyEvery 3 weeksEvery 3 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.4 — better17.0
Further details — not scored
Size39 MB2 MB
Age rating17+12+
DeveloperRapid Sync IT LLCJEFFREY BLAINE HOLMAN

In-app purchases

1 purchases

PepSync

One-time1
  • Unlock PepSync$19.99
3 purchases

Vial

Subscriptions2
  • Vial Premium Monthly3 Days trial$4.991 Month
  • Vial Premium Annual3 Days trial$24.996 Months
One-time1
  • Vial Lifetime Access$44.99

Questions

Is PepSync free?
PepSync is free to download, with in-app purchases available.
Is Vial free?
Vial is free to download, with in-app purchases available.
Do PepSync or Vial have ads?
Neither PepSync nor Vial shows ads.
Which is updated more often, PepSync or Vial?
PepSync ships an update every 3 weeks, and Vial every 3 days. Most recently, PepSync was updated on October 1, 2026 and Vial on October 6, 2026.

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