Why Protocol wins
No account. No cloud. Your data never leaves your device. Stealth Mode disguises the app icon — no other tracker has this. Your protocol is nobody else's business.
Protocol is the only app that treats your injury stack, your longevity stack, or your GLP-1 cycle as a unified protocol — compounds, supplements, and habits tracked together. Not three separate apps. One.
6 AI touchpoints woven throughout the app — not a bolted-on chatbot. The AI knows what you reconstituted, what you drew, and how you responded. Stack Score rates your protocol. Interaction Checker flags your pairs.
Every compound includes dosing, half-life, reconstitution guidance, PK curve modeling, and a direct link to the full research profile. The deepest catalog in the category. No paywall on the research.
No other peptide tracker ships a companion research website with 81 compound profiles, dosing guides, reconstitution calculators, comparison tools, and a full compound library — all free, no account required. Tap "View Full Profile" on any catalog compound and it opens directly. The app and the website are one product.
Quick verdict
| App | Best for | Stars | Annual |
|---|---|---|---|
| Protocol | AI-powered protocol architect — the full stack | 5.0 ⭐ | $49.99 |
| Peptify | Feature density + local storage + bloodwork OCR | 4.3 ⭐ | $29.99 |
| PepTracker | Clean UI, reliable basics | 4.7 ⭐ | $47.99 |
| Pep AI | Automation + AI meal/body scanning | 4.7 ⭐ | $39.99+ |
| PeptIQ | Research validation + Claim Auditor | 4.3 ⭐ | $99.99 |
App Store ratings as of May 15, 2026.
What actually separates Protocol from every other app
Before reviewing each competitor, it is worth understanding what Protocol v3.0.0 ships that no other app in this category has. These are not marginal feature differences. They are fundamental capability gaps.
🤖 Six distinct AI touchpoints — woven into the entire workflow
Pep AI has one AI chatbot. Protocol has AI built into six distinct touchpoints across the entire experience — and unlike a general chatbot, Protocol's AI knows your actual stack, your reconstitution math, your dose history, and your check-in logs.
The Research Assistant is the most sophisticated AI feature in any peptide app. It does not just answer general questions — it answers in the context of what you are actually running. Ask about combining Cerebrolysin with TB-500 and it gives you the theoretical basis for combination, a practical stacking framework, and specific limitations with cited references.
Every answer includes relevant PubMed search terms and a clear disclaimer separating research context from medical advice. This is the AI layer peptide users have been asking for — specific, cited, and honest about what the evidence does and does not support.
📈 Full pharmacokinetic modeling with PK curves
No competitor models pharmacokinetics. Protocol does — for every compound in the 81-compound catalog. View the full PK curve for any compound: CMAX, TMAX, CMIN, CAVG, and AUC across 1, 4, 8, or 12 doses. Toggle between the full model and daily dosing simulation. See the actual absorption rate, elimination rate, bioavailability, and volume of distribution parameters behind the curve.
This is the same data that drives the Active Levels chart on your Today screen — all compounds plotted simultaneously so you can see when each one peaks, how long it stays active, and when it clears. Understanding the pharmacokinetics of your stack is not optional when you are running multiple compounds with different half-lives.
📚 81-compound research catalog — the deepest in the category
Every compound in Protocol's catalog includes: typical dosing range, half-life, route of administration, reconstitution guidance, common uses, clinical notes, and a direct link to the full research profile at protocolapp.health — mechanism of action, evidence grades, citations, and FAQ.
The catalog covers peptides, GLP-1 agonists, TRT compounds, longevity agents (Rapamycin, NMN, Metformin, Spermidine), nootropic peptides (Semax, Selank, Cerebrolysin), and metabolic compounds. 81 profiles. No paywall on the research.
🧪 Enhanced reconstitution calculator — slider + custom units
The v3.0.0 reconstitution calculator is nearly identical to the full web version at protocolapp.health. The concentration slider — new in v3.0.0 — lets you adjust BAC water volume in real time and see the effect on draw units, concentration, and doses per vial instantly.
The custom draw amount section lets you enter a specific number of units and get the exact BAC water volume to add. A syringe visualization shows the exact fill level. No competitor has any of this — most show you a single number and call it done.
🩸 Bloodwork & lab tracking — the most comprehensive in the category
Protocol's bloodwork tracking covers the full panel that serious protocol runners actually monitor: hormones (Total T, Free T, Estradiol, SHBG, LH, FSH, Prolactin), thyroid (TSH, Free T3, Free T4), growth (IGF-1), metabolic (fasting glucose, HbA1c), lipids (LDL, HDL, Triglycerides), and CBC (hematocrit, hemoglobin).
Log results with a date stamp and Protocol trends them over time — so you can see how your testosterone tracked across three TRT protocol adjustments, or how your IGF-1 responded to your GH peptide stack. Peptify has basic bloodwork logging. No competitor tracks this breadth or trends it against your protocol timeline.
The honest competitor breakdown
PepTracker
Clean UI, reliable dose logging, good for beginners. v1.13+ added real vial tracking and protocol cycling.
- ✗No AI features of any kind
- ✗No compound research catalog or PK data
- ✗No 3D injection site body map
- ✗No Stack Score or interaction checker
- ✗No bloodwork tracking
- ✗No reconstitution calculator with slider
- ✗No unified compound + supplement + habit tracking
More capable than it looks. Vial tracking, protocol cycling, CSV/PDF export, and calendar sync are solid basics. But zero AI, zero PK modeling, and zero research depth. A good starter app that serious users outgrow.
Pep AI
AI meal scanner, body composition scanner, side effect tracking with dose correlation, bloodwork dashboard.
- ✗AI is NOT connected to your protocol data — general chatbot only
- ✗No pharmacokinetic curve modeling
- ✗No Stack Score or radar chart
- ✗No compound interaction checker
- ✗No 3D injection site body map
- ✗No unified compound + supplement + habit tracking
- ✗Cloud-based — your peptide data is stored on their servers
- ✗AI features cost extra on top of platform fee
The automation play — AI meal scanning and body scanning are genuinely unique. Bloodwork dashboard is real. But the AI is a general chatbot, not stack-aware. Protocol's AI knows what you reconstituted, what you drew, and how you are responding. Pep AI's does not. And your peptide use data lives in their cloud.
PeptIQ
Claim Auditor (fact-checks social media health claims vs. peer-reviewed literature), AI protocol builder, vial OCR scanning, half-life visualizations.
- ✗No 3D injection site body map — uses 2D rotation log
- ✗No Stack Score radar chart
- ✗No compound interaction checker
- ✗No bloodwork tracking
- ✗No unified compound + supplement + habit tracking
- ✗Most expensive annual pricing in the category
- ✗Cloud-based storage
The research-first app. The Claim Auditor is genuinely unique — fact-checking YouTube and Reddit health claims against PubMed is a high-value feature for the biohacking community. AI protocol builder and vial OCR are real. But it is expensive, lacks the body map and interaction checker, and still does not know your actual stack the way Protocol does.
Peptify
150+ features, local storage, bloodwork OCR (80+ biomarkers), two-compartment PK engine, home screen widget, 32-lesson research curriculum.
- ✗No Stack Score or radar chart
- ✗No compound interaction checker built into protocols
- ✗No unified compound + supplement + habit tracking
- ✗No Stealth Mode (app icon disguise)
- ✗No AI that knows your specific logged data
- ✗No Active Levels chart across all compounds simultaneously
The strongest competitor. Local storage, 80+ biomarker bloodwork OCR, and a two-compartment PK engine are legitimately impressive. Peptify earns its place. Where Protocol wins: the AI layer that knows your stack, the Interaction Checker, Stack Score, Active Levels, and Stealth Mode. Peptify has more raw features. Protocol has more intelligent ones.
Full feature comparison
| Feature | Protocol | Peptify | Pep AI | PepTracker | PeptIQ |
|---|---|---|---|---|---|
| AI (stack-aware — knows your data) | ✅ | ❌ | ❌ General chatbot | ❌ | ❌ |
| AI Check-in Coach | ✅ | ❌ | ❌ | ❌ | ❌ |
| Stack Score & Radar Chart | ✅ | ❌ | ❌ | ❌ | ❌ |
| Compound Interaction Checker | ✅ | ❌ | ❌ | ❌ | ❌ |
| PK curve modeling | ✅ 1-compartment | ✅ 2-compartment | ❌ | ✅ Visualizer | ❌ |
| Active Levels (all compounds, one timeline) | ✅ | ❌ | ❌ | ❌ | ❌ |
| Compound research catalog | ✅ 81 compounds | ❌ | Partial | ❌ | ✅ AI builder |
| Bloodwork tracking | ✅ Manual entry | ✅ OCR (80+ markers) | ✅ Dashboard | ❌ | ❌ |
| Reconstitution calculator (slider + custom) | ✅ | ❌ | ❌ | ❌ | Basic |
| 3D injection site body map | ✅ Front + back | ❌ | ❌ | ❌ 2D only | ❌ |
| Compounds + supplements + habits in one protocol | ✅ Only app | ❌ | ❌ | ❌ | ❌ |
| Protocol cost tracking | ✅ | ❌ | ❌ | ❌ | ❌ |
| Home screen widget | Coming soon | ✅ | ❌ | ❌ | ❌ |
| Local storage / no cloud | ✅ | ✅ | ❌ Cloud | ❌ Cloud | ❌ Cloud |
| Stealth Mode (app icon disguise) | ✅ Unique | ❌ | ❌ | ❌ | ❌ |
| Vial tracking & inventory | ✅ | ✅ | ❌ | ✅ | ✅ OCR scan |
| iOS + Android | ✅ | iOS only | iOS only | iOS only | iOS only |
| App Store rating (May 2026) | 5.0 ⭐ | 4.3 ⭐ | 4.7 ⭐ | 4.7 ⭐ | 4.3 ⭐ |
Table reflects app capabilities as of May 2026. Protocol v3.0.0.
Why Protocol wins in 2026
Let's be honest. Peptify has local storage too. PeptIQ has a research tool. Pep AI has an AI chatbot and bloodwork. PepTracker has solid vial tracking. The 2026 market is not a one-horse race.
What Protocol has that none of them have is AI that actually knows your stack. Not a general chatbot — an assistant that knows what you reconstituted, what you drew, what you logged, and how you responded. That AI surfaces inside six different points in your workflow: Inventory, Catalog, Add Item, Protocol Details, Check-in Coach, and Progress. Stack Score scores your specific protocol. The Interaction Checker flags your actual compounds. Every insight is contextual.
Add to that the only thing Peptify, Pep AI, PeptIQ, and PepTracker will never have:
- ✓Stealth Mode — your app looks like a shield, not a peptide tracker. No competitor has this.
- ✓Unified protocols — peptides, supplements, AND habits tracked in one protocol. Zero competitors.
- ✓Active Levels chart — every compound plotted simultaneously on one timeline. Zero competitors.
- ✓Compound Interaction Checker — 30 most common pairs, built in. Zero competitors.
- ✓Stack Score + Radar Chart — AI rates your stack across 6 dimensions. Zero competitors.
- ✓5.0 stars on the App Store — higher than every competitor as of May 2026.
And on privacy — Protocol and Peptify both use local storage. But only Protocol has Stealth Mode. That is the difference between "private by architecture" and "private and invisible." For the user running peptides they would rather not explain, that gap matters.
Try Protocol free for 14 days
Every new install gets 14 days of Pro automatically. No opt-in, no credit card. Stack Score, Interaction Checker, AI Research Assistant, PK curves, bloodwork tracking — everything unlocked from the moment you install.
iOS · Android · Free to start · Pro unlocked at install