PeptidePal vs Strength IO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PeptidePal
This app helps users meticulously track research peptides, manage inventory, and schedule doses with smart reminders. It also offers new health tracking features for sleep, supplements, and progress monitoring, with secure data syncing and export options.
- Log doses with a simple swipe
- Track multiple peptides simultaneously
- Organize peptide stock with low stock alerts
- Daily or specific day dose reminders
- Monitor sleep patterns and quality
- Track weight and body measurements
- Export data as CSV for analysis
Read full descriptionHide full description
PeptidePal is the comprehensive peptide tracking solution designed for serious users who need precise organization and monitoring of their research peptides. KEY FEATURES: SMART TRACKING • Log doses with a simple swipe • Track multiple peptides simultaneously • Monitor vial usage and remaining doses • Automatic expiration date tracking INVENTORY MANAGEMENT • Organize your peptide stock • Low stock alerts • Batch and lot number tracking • Complete vial lifecycle management INTELLIGENT SCHEDULING • Daily or specific day schedules • AM/PM dose reminders • Never miss a dose with smart notifications • Flexible scheduling options HEALTH TRACKING (NEW!) • Monitor sleep patterns and quality • Track supplement intake and adherence • View personalized health insights • Comprehensive health timeline PROGRESS MONITORING • Track weight and body measurements • Progress photos with secure storage • Export data as CSV for analysis • Visual charts and trends PRIVACY FOCUSED • Your data syncs across all your devices • Secure authentication required • Encrypted cloud backup • Full data export capability ADDITIONAL FEATURES • Reconstitution calculator • Offline functionality • Regular updates and improvements • Haptic feedback for better user experience SUBSCRIPTION & AUTHENTICATION PeptidePal Pro subscription ($2.99/month) unlocks full functionality including unlimited peptide tracking, health monitoring, progress tracking, and data export features. Account creation required for cross-device sync and data backup. IMPORTANT DISCLAIMER PeptidePal is a tracking tool for research peptides only. This app does not provide medical advice, diagnosis, or treatment recommendations. Always consult with a qualified healthcare provider before making any decisions related to peptides or your health. TERMS & PRIVACY Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://jiveshbhatti.github.io/peptidepal-legal/privacy-policy.html Custom Terms of Service: https://jiveshbhatti.github.io/peptidepal-legal/terms-of-service.html
Strength IO
This app intelligently adapts your strength training sessions based on your daily recovery signals and logged activities from other apps. It analyzes multiple health metrics to determine optimal workout intensity, preventing overtraining and maximizing gains. Track your progress with detailed athlete profiles and personalized insights.
- Adaptive training based on per-muscle recovery
- Integrates with Apple Health for activity logging
- Readiness score from seven health signals
- Training load analysis (7-day vs. 28-day)
- Smart weekly volume tracking
- Comprehensive athlete profile with strength and cardio scores
- Private by default, on-device coaching
Read full descriptionHide full description
Everything in. Your session out. Strength IO reads everything you do: your lifts, the runs, rides and games you log in other apps, and your recovery from Apple Health. Then it builds the strength session your body can handle today, and an AI coach explains why. WHAT IT DOES • Workouts built for your week: every muscle gets the sets it needs, with the right mix of movements. Your main lifts rotate among your favorites, and accessory lifts vary. • Weights anchored to real effort: each lift's weight comes from your own history. Heavy lifts that load your spine keep a rep in reserve, and tired muscles get pulled back. • AI coach: a short daily overview of your vitals, sleep and training, plus a note on your training load, built on Apple Intelligence. • Your whole week counts: logged a run in Strava, a ride on Peloton or a game in Apple Fitness? Strength IO reads it through Apple Health and adjusts today's lifting. No double-logging. • Readiness from five overnight signals: HRV, sleep, sleeping heart rate, breathing rate and wrist temperature, each judged against your own normal and combined into one daily estimate. It shows exactly what's lowering or raising your score. • Training load: your last 7 days against your usual 28, with a clear read on whether you're ramping up too fast, holding steady or backing off. • Records and plateaus: personal records for every lift, and early warning when one stalls. • Ready for iOS 27: heart-rate zones from your Apple Watch, and Siri answers about your readiness and today's workout. • Private by design: the AI coach uses Apple's models only, on your iPhone or on Apple's Private Cloud Compute. Never a third-party AI. BUILT FOR The multi-sport lifter. If you train 3–4 times a week, wear an Apple Watch, and also run, ride or play, Strength IO reads all of it. STRENGTH IO PRO Strength IO starts with a free trial of the full app, nothing held back. After the trial, a monthly or yearly subscription keeps everything unlocked. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the period. Manage or cancel anytime in your App Store account settings. Terms: https://strengthio.app/terms Privacy: https://strengthio.app/privacy iPhone & Apple Watch. AI coach requires an iPhone that supports Apple Intelligence. Estimates based on your data. Not medical advice.
Screenshots
Verdict
The clearest difference is rating: Strength IO at 5.0 against PeptidePal's 3.4. Strength IO also leads on update cadence (every 6 days vs fortnightly). PeptidePal's advantage is ratings volume (5 vs 1) and iOS requirement (15.1 vs 26.4). On price, ads, 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
Both are free to download. PeptidePal sells 3 in-app purchases, starting at $2.99 per month and Strength IO sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
Strength IO holds the better App Store score, 5.0 against 3.4. That said, the two scores are not equally well evidenced: PeptidePal has 5 ratings behind it against 1, so its average is the more settled of the two.
PeptidePal ships an update fortnightly, Strength IO every 6 days. The most recent releases landed on October 15, 2026 and October 10, 2026 respectively.
| Parameter | PeptidePal | Strength IO |
|---|---|---|
| Price | Free | Free |
| Rating | 3.4 (5 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 5 — better | 1 |
| Update frequency | Fortnightly | Every 6 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Freemium |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Requires iOS | 15.1 — better | 26.4 |
| Further details — not scored | ||
| Size | 48 MB | 27 MB |
| Age rating | 17+ | 4+ |
| Developer | SIGNALWORKS LABS INC. | Crimson IO LLC |
Customer experience
PeptidePal
Strength IO
In-app purchases
PeptidePal
- PeptidePal Pro7 Days trial$2.991 Month
- Peptidepal Yearly$29.991 Year
- PeptidePal Pro$2.99
Strength IO
- Strength IO Pro7 Days trial$9.991 Month
- Strength IO Pro7 Days trial$59.991 Year









