Best Apps to Track Peptides and TRT (2026), Compared

The best app to track peptides and TRT in 2026 depends on what you are optimizing for: injection logging, reconstitution and dose calculators, lab and bloodwork trending, body composition, or muscle preservation. Almost every serious app handles the core job (logging your injection, rotating sites, noting side effects, tracking weight) well, so the real differences show up in the specialized features. For muscle-first integration specifically, where body composition, protein, and training sit next to your dose and lab logs, the field narrows to Myo.

This roundup compares five of the strongest options (Regimen, Pep AI, Shotsy, Phaze, and Myo), gives each an honest "best for" verdict, and is clear about where each one stops. Features and pricing change often, so confirm the details on each app's current App Store or Google Play listing as of 2026 before you decide.

How we compared these apps

We scored each app on the dimensions peptide and TRT users actually weigh: injection and dose logging, reconstitution and dose calculators, pharmacokinetic (PK) curves, lab and bloodwork logging, body composition (fat vs lean mass and muscle analytics), resistance-training logging, platforms (iOS and Android), free tier, and price.

We used public App Store, Google Play, and official-site information as of 2026. Where a capability is not documented publicly, we mark it "not publicly confirmed" rather than assuming it is missing, because these apps ship updates constantly. Treat the table as a snapshot, not a permanent ruling.

Two quick definitions. A "compound" here means a tracked substance (a peptide, a GLP-1, or a TRT ester). A "PK curve" means the rise and fall of estimated drug levels over time, which helps you picture where you sit in a dosing cycle.

The comparison table

Read across rows, not down columns. Each of these apps is genuinely good at its core job; the table shows where their strengths and gaps fall for a peptide or TRT user.

Feature	Myo	Regimen	Pep AI	Shotsy	Phaze
Injection/dose logging	✓ Sites, dates, missed-dose marker	✓ Site rotation, multi-compound	✓ Body map, site tracking	✓ Broad med list, site rotation	✓ 14+ medications
Reconstitution & dose calculators	limited: titration/microdose planner + reconstitution tool	✓ 6 calculators (best suite)	✓ Reconstitution + compound estimator	limited: not a calculator focus	limited: not a calculator focus
PK / estimated levels	✓ Med-level curve + "Your Body's Curve"	✓ PK visualizer, 40+ compounds	✓ PK/compound estimator	✓ Estimated GLP-1 level (Premium)	✓ PK estimated levels
Lab/bloodwork logging	✓ Lab panels trended	✓ 50+ markers	limited	limited: recently added body-fat/glucose	✓ 8 lab categories
Body composition (fat vs lean)	✓ Fat-vs-muscle + muscle-loss trend flag; DEXA/InBody/scale sync	limited: syncs body-fat %, no native fat-vs-muscle	not listed	limited: logs body-fat/lean-mass numbers	✓ AI body-comp (beta) + DEXA import + lean-mass trending
Resistance-training logging	✓ In-app	not publicly confirmed	not listed	not listed	not listed
Platforms	iOS	iOS + Android	iOS + Android	iOS + Android	iOS (Android listed, verify)
Free tier	✓ Free for 1 medication	✓ Free for 1 compound (all features)	✓ Free app + Premium	✓ Free tier (limited)	✓ Free tier (limited)
Price (as of 2026)	$6.99/mo, $39.99/yr, $99.99 lifetime	$4.99/mo, $39.99/yr	~$9.99/mo, ~$24.99-44.99/yr	~$9.99-19.99/mo, ~$39.99-59.99/yr	$4.99/mo, $34.99/yr

Cells marked "not listed" or "not publicly confirmed" reflect what is publicly documented as of 2026, not a claim the feature is impossible. Verify each app's current listing.

Regimen: best calculators, PK, and bloodwork logging

Regimen (by Awaken Labs LLC) is the power user's protocol tracker, and for peptide and TRT users it earns the most credit in this lineup. On calculators it is the best in the group: it ships six calculators (reconstitution, reverse BAC, TRT oil, GLP-1, intranasal, and split-dose), which covers the math a TRT or multi-peptide regimen actually needs. It adds a PK half-life visualizer covering 40-plus compounds, injection-site rotation, and a "Signals" correlation engine, on both iOS and Android with Apple Health and Google Health Connect sync.

For TRT specifically, two things stand out. The TRT oil calculator handles the oil-based dosing math that GLP-1-only apps ignore, and the lab and bloodwork logging spans 50-plus markers, which is the deepest in this roundup. That breadth matters when you are watching testosterone, free testosterone, hematocrit, estradiol, and more across a protocol. Regimen also logs progress photos and supports CSV import and export. It is free for one compound with all features, then $4.99 per month or $39.99 per year with a 14-day trial. If you run a stack, want serious calculators and PK curves, need Android, or want the deepest bloodwork log, Regimen is hard to beat, and it would be wrong to suggest otherwise. We get into why those markers matter in TRT bloodwork and labs.

The honest gap is on the muscle side. Regimen syncs body-fat percentage from your Health integrations, but it does not offer a native fat-vs-muscle analysis, and resistance-training logging is not publicly confirmed in its feature set as of 2026. So Regimen can pull in a body-fat number, but it does not interpret lean mass as a muscle-preservation signal or log the training that defends it. Best for: multi-compound and TRT power users who want the deepest calculators and bloodwork logging, especially on Android.

Pep AI: best broad all-in-one peptide tracker

Pep AI (by Zode Development LLC) is the strong, broad all-in-one for people running peptides alongside GLP-1s, and it is well rated for good reason (around 4.7 stars from 1,400-plus ratings as of 2026). It runs on iOS and Android, includes an interactive injection-site body map, lets you log 15-plus side-effect symptoms with severity, tracks nutrition and macros with an AI meal-photo scanner, offers a PK and compound-level estimator, and includes a reconstitution "Peptide Calculator." It also syncs with Apple Health, ships Apple Watch support, and provides a 75-plus compound research library plus PDF export.

That compound library and the reconstitution calculator are genuinely peptide-specific tooling, not a GLP-1 feature set bolted onto peptides, which makes Pep AI a natural fit for someone exploring or running multiple peptides. The AI meal scanning and Apple Watch support round it out as a modern, capable daily driver. If you want one app that spans peptides and GLP-1s with broad coverage and AI nutrition, Pep AI is a genuinely good choice.

Where it stops is body composition and training. As of 2026, fat-vs-muscle body-composition analysis is not listed in Pep AI's public feature set, and resistance-training logging is not listed either. So Pep AI will track your injections, symptoms, compounds, and macros well, but it does not separate fat mass from lean mass or log your lifts, which are the two streams that matter most for keeping muscle. Best for: peptide users who want broad all-in-one coverage with AI nutrition and Apple Watch.

Shotsy: best community and mainstream experience

Shotsy (by Aja Beckett) is the mainstream favorite, with the largest community in this lineup (over a million downloads and a 4.9 rating as of 2026) and a notably polished, focused experience on iOS and Android. It covers a wide medication list (Ozempic, Wegovy, Mounjaro, Zepbound, Rybelsus, Saxenda, Trulicity, plus compounded and custom), and handles dose logging, side effects, weight, and injection-site rotation. On premium it adds estimated GLP-1 level charts and nutrition tracking (calories, protein, water). If you want a beautiful, well-supported shot tracker with a big, active community to lean on, Shotsy is an easy recommendation.

To be fair to Shotsy, it recently added logging of body fat, lean body mass, waist circumference, and blood glucose, so it is no longer accurate to say it ignores body composition. The honest distinction is between logging a number and analyzing it: Shotsy lets you record a lean-mass figure, but a documented engine that flags a muscle-loss trend, correlates lean mass with protein and training, or imports a DEXA or InBody scan is not part of its public feature set as of 2026, and resistance-training logging is not listed.

One more fair point for this article's focus: Shotsy is more GLP-1-centric than peptide or TRT-centric, so a TRT user wanting deep bloodwork or oil-dose math will find it lighter than Regimen there. Best for: mainstream GLP-1 shot tracking with the biggest community and a polished experience. Check its current listing, since it has been adding features quickly.

Phaze: closest peer on body composition

Phaze (by Zeit Capital Ltda.) is the closest competitor to a muscle-aware approach, and on body composition it is excellent. It markets itself as the most complete GLP-1 tracker spanning 14-plus medications, and its standout is a body-composition feature (in beta) that combines an AI photo estimate of body fat and muscle (stated accuracy around plus or minus 3 to 5 percentage points) with DEXA scan import and lean-mass trending. It also offers PK estimated levels, protein-first nutrition logging with AI photo, barcode, and voice input, lab tracking across eight categories, progress photos, and a shareable clinical PDF, on a free tier plus Pro at $4.99 per month or $34.99 per year with a 7-day trial. If importing your DEXA and trending lean mass is the feature you care about most, Phaze is a serious, capable pick.

The gap, honestly stated, is resistance-training logging, which is not listed in Phaze's public feature set as of 2026. Resistance training is the strongest lever for preserving muscle, so Phaze can measure and trend your body composition (and even ground it in a DEXA) without logging the workouts meant to protect it. It is also more GLP-1-centric than peptide or TRT-centric, so factor that in if your protocol leans toward peptides or testosterone. Best for: users who want the deepest body-composition import and trending and already track their training elsewhere.

Myo: the muscle-first option

Myo (by PixelPort LLC) covers the table-stakes a peptide or TRT user expects. It logs doses with sites, dates, and a missed-dose marker, maps injection sites, tracks weight, side effects, and daily check-ins, draws PK curves with a personal "Your Body's Curve," stores and trends lab panels, includes a titration and microdose planner, and offers a supply and vial tracker for compounded users. Reconstitution and other calculators exist as Myo tools as well, so on the fundamentals it stands with the rest of this group.

Its differentiator is that it organizes around muscle. Myo connects the data streams that the scale alone cannot read: a fat-vs-muscle body-composition split (syncing a smart scale, DEXA, or InBody) with a muscle-loss trend flag, a calculated protein target with daily coaching, and in-app resistance-training logging, all sitting next to your dose and lab logs. That integration (body composition plus protein plus training, interpreted together) is the combination none of the other four currently bundles. We go deeper on the approach in body recomposition with peptides, and compare the muscle-side feature sets head to head in the best apps to track GLP-1 and muscle loss. If you also run a GLP-1, our GLP-1 tracking app comparison covers that lineup in detail.

The honest limitations: Myo is iOS only as of 2026, so Android users should look at Regimen, Pep AI, or Shotsy. And its calculator suite is lighter than Regimen's, so if precise dose math across a large stack is your top priority, Regimen leads there. On price, the free tier covers one medication with shot and pill logging, a missed-dose marker, an injection-site map, weight, side effects, daily check-ins, manual protein, fiber, and water rings, reminders, Apple Health sync (never paywalled), and data export. Premium ($6.99/mo, $39.99/yr with a 7-day trial, or $99.99 lifetime) adds multi-medication, the full PK curves and "Your Body's Curve," GLP-1 week phases, the fat-vs-muscle tracking and muscle-loss trend flag, doctor-ready PDF and CSV reports, side-effect correlation charts, the supply and vial tracker, a food database with barcode, photo, and voice logging, the resistance-training logging and protein coaching, the titration and microdose planner, widgets, and iCloud sync. Myo is a tracking and education tool, not medical advice, and it is not affiliated with any GLP-1 maker. Best for: peptide and TRT users on iOS who want to organize the protocol around keeping muscle, not just running the doses.

How to choose the right app for you

Pick by your top priority, because every app here is good at something:

• You want the deepest calculators and bloodwork logging, or you need Android: Regimen.
• You want a broad all-in-one peptide app with a big compound library and AI nutrition: Pep AI.
• You want the most popular, polished mainstream GLP-1 tracker with a big community: Shotsy.
• You want the deepest body-composition import and trending (DEXA, AI estimate): Phaze.
• You want muscle-first integration (body comp, protein, training, and labs together) on iOS: Myo.

Two rules outrank the app choice. First, check the free tier's exact limits (how many compounds or medications, which calculators, which features) before paying, because they differ a lot. Second, whatever you pick, use it consistently: a tracker only earns its keep when you open it every week and watch the trend rather than chasing a single number. The right app is the one that fits how you actually manage your protocol.

References

Pep AI features and pricing: pepaiapp.com and App Store/Google Play listings, as of 2026 (injection-site body map, 15+ side-effect symptoms, AI meal-photo scanner, PK and compound-level estimator, reconstitution "Peptide Calculator," Apple Watch, 75+ compound library; around 4.7 rating from 1,400+ ratings).

Regimen features and pricing: helloregimen.com and App Store/Google Play listings, as of 2026 (6 calculators including TRT oil and split-dose, PK visualizer for 40+ compounds, lab logging across 50+ markers, "Signals" correlation engine, Apple Health and Google Health Connect; free for 1 compound, $4.99/mo or $39.99/yr).

Shotsy features and pricing: shotsyapp.com and App Store/Google Play listings, as of 2026 (broad medication list, estimated GLP-1 level charts, nutrition, and recently added body-fat, lean-body-mass, waist, and glucose logging; 4.9 rating, 1M-plus downloads).

Phaze features and pricing: phaze.fit official site and App Store listing, as of 2026 (body-composition beta with AI estimate and DEXA import, PK levels, protein-first nutrition, labs across 8 categories, clinical PDF; Pro $4.99/mo or $34.99/yr).

Myo features and pricing: Myo by PixelPort LLC, App Store listing, as of 2026.

Testosterone therapy clinical context: Endocrine Society Testosterone Therapy guideline (https://www.endocrine.org/clinical-practice-guidelines/testosterone-therapy).

App features and pricing change frequently; confirm the current App Store or Google Play listing for each app before deciding.