# prtcl: protocol tracker — Habits, health & measurements > Habits, health & measurements (iPhone/iPad app by Dafydd Llwyd.) - Source: https://appshunter.io/ios/app/prtcl-protocol-tracker/id6761626815 (this page in markdown: same URL + `.md`) - Developer: [Dafydd Llwyd](https://appshunter.io/developer/1890528951) - Category: Health & Fitness - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 15.0 · 35 MB - Languages: American English - Released: 2026-04-19 - Data updated: 2026-10-11 - User reviews in markdown: https://appshunter.io/ios/app/prtcl-protocol-tracker/id6761626815/reviews.md ## What is prtcl? Your health protocols and measurements, together. Make a protocol your own, follow your daily steps, and track the measurements that matter to you. Keep your routines, running times, weight, sleep and photo records in one place. Built for people who like to measure things, prtcl gives you a practical logbook for biohacking, fitness and everyday health routines. Make a protocol your own Choose a template or build a protocol from scratch. Keep the steps that fit, drop the ones that don't, and add your own. Set targets and schedules as your routine changes. Know what's on today Follow your scheduled steps in one daily log. Tick off a task, enter a measurement or record a tally. Weighted adherence scores help you see how consistently you follow your plan. Connect the dots Explore correlations between your protocol steps and your markers. See how your routine relates to changes in your measurements and find patterns worth investigating. Correlations show associations, not proof of cause. Track what matters to you Log weight, sleep, running times and custom measurements. Record subjective markers such as energy or mood, and review your history in charts. Keep photo markers alongside your numbers with timeline, comparison and overlay views. Bring your records with you Import a .prtcl or JSON protocol file and customise it. Save a backup of your records and photos, export tracking data as CSV, and restore from a backup. Start free Try your first protocols, daily logging and your first confirmed pattern before subscribing. prtcl Pro shows every pattern after your first, and adds unlimited protocol adoptions, custom protocols and steps, plus 30-, 60- and 90-day adherence views. Some features shown in screenshots require Pro. Subscription prices and any available offers are shown in the app before purchase. Your tracking records are stored on your device. No prtcl account is required. Subscriptions use RevenueCat and the platform's app store. See the privacy policy for details about optional health connections and other services. prtcl is a tracking tool, not a medical device. It does not diagnose conditions or recommend treatments. Use it to keep records and discuss questions with a qualified health professional. Terms of Use: https://rasena.co.uk/prtcl/terms-of-service.html Privacy Policy: https://rasena.co.uk/prtcl/privacy-policy.html ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | prtcl Pro | $59.99 | per year | | prtcl Pro | $7.99 | per month | ## Version history (last 5 releases) ### 1.3.2 — 2026-10-01 Daily check-in: an optional reminder to log your day, at a time you choose. After your first logged day, prtcl asks once whether you would like one. It skips rest days and days you have already logged. A guide on Today shows how many days you have logged while prtcl builds up enough data to find patterns. ### 1.3.1 — 2026-09-29 Your first confirmed pattern is free. Pro now shows every pattern prtcl finds after it, with the numbers behind each one. A clearer upgrade screen that shows any free trial you're eligible for. Updated purchase and build components for the latest iOS and Xcode. ### 1.3.0 — 2026-09-16 Import a protocol from a .prtcl or JSON file, then customise its steps and targets. Keep photo markers alongside your measurements, with timeline and comparison views. Back up your records and photos, export tracking data, and restore from a backup. Clearer chart labels and improvements to logging, accessibility and reliability. ### 1.2.2 — 2026-05-08 NEW: Symptom tracking Track subjective symptoms: energy, sleep quality, brain fog, joint pain, GI issues, mood, or anything else on a 1–5 scale. Symptoms are markers, so they feed straight into your correlation engine: now you can see which protocol steps actually move how you feel, not just your numbers. Plus various bug fixes and polish. ### 1.1.1 — 2026-04-26 Two big additions in this release. MARKERS Track objective health metrics alongside your protocols. body weight, resting heart rate, sleep duration, blood pressure, body fat, fasting glucose, VO2 max, or anything else you'd like. with many already included in the app, or create your own with custom units. Log values, view trends in clean charts, and pin the markers you check most often. CORRELATIONS prtcl now looks for statistical relationships between your protocol adherence and your marker values. The engine runs daily, tests correlations across multiple lag windows, and only surfaces results that pass significance and strength gates. Discover which steps actually move the needle on the metrics you care about. No guesswork, no false confidence from small samples. Plus the usual round of polish and bug fixes. ## Apps similar to prtcl | App | Rating | Price | Category | | --- | --- | --- | --- | | [Biohacking Tracker: Biohackr](https://appshunter.io/ios/app/biohacking-tracker-biohackr/id6745122843) | 5.0 (1) | Free | Health & Fitness | | [IceBuddy: Cold Plunge Tracker](https://appshunter.io/ios/app/icebuddy-cold-plunge-tracker/id6523435122) | 4.6 (29) | Free | Health & Fitness | | [Heart Rate Ninja](https://appshunter.io/ios/app/heart-rate-ninja/id1515206860) | 4.8 (57) | Free | Health & Fitness | | [Peptide Log](https://appshunter.io/ios/app/peptide-log/id6744315346) | 4.2 (35) | Free | Health & Fitness | | [Tousains](https://appshunter.io/ios/app/tousains/id6636468861) | 2.3 (3) | Free | Health & Fitness | | [SiPhox Health](https://appshunter.io/ios/app/siphox-health/id6739498570) | 4.8 (83) | Free | Health & Fitness | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-11.*