Comparison

Peptide Plug vs TRT Monitor

TRT Monitor is a focused testosterone-therapy tracker built around injections, blood markers and symptom trends, with shareable clinician reports and AI-assisted lab import. Peptide Plug covers TRT as one protocol among several and adds the vial, cost and calculator layer.

Short version

TRT Monitor is the stronger fit if testosterone therapy is the only thing you track and you want AI lab import and a polished shareable report. Peptide Plug is the stronger fit if you run more than one protocol, need reconstitution or dose-split math, or want cost per dose and vial run-out. TRT Monitor is £3–£5/month with no feature gating; Peptide Plug is $4.99/mo or $49.99/yr.

Feature-by-feature

Based on TRT Monitor's published product and pricing pages and this Peptide Plug build, reviewed September 9, 2026.

Feature	Peptide Plug	TRT Monitor
Platforms	Installable web app for phone, tablet and desktop	Not stated; described as phone and laptop
Price	$4.99/mo or $49.99/yr	£5/mo, £4/mo quarterly, £3/mo annual (£36/yr)
Free tier	1 active schedule, all public calculators, no card	Free first month, then subscription
Feature gating	Free tier limited to 1 active schedule	No tiers. Every plan identical
Dose logging	✓ Injections, schedules, titration steps	✓ Injections, gels, tablets
Blood test tracking	✓ Manual labs with chart overlays	✓ Markers vs reference ranges + AI import
Symptom trends	✓ Configurable daily markers	✓ Mood, energy and more with trend charts
Clinician report	✓ Full JSON export; CSV of the log, inventory and cost forecast on Pro	✓ Shareable progress report
Injection-site rotation	✓ Site logged per injection with previous site shown	✓ Site rotation
Reconstitution / dose-split math	✓ Full reconstitution, blend and syringe-unit math	Not stated
Cost per dose / run-out	✓ Cost per dose, per month and vial run-out forecasting	Not stated
Inventory & expiry	✓ Vials, diluent, in-app low-stock and mixed-vial expiry alerts	Not stated
Covers GLP-1, peptides, HRT	✓ One timeline for all	TRT-focused
Public calculators	✓ 17 free, no account	Not stated

Sources: trtmonitor.com and its pricing page. Prices are listed in GBP as published.

Where each one wins

Neither is better at everything. These are the honest trade-offs.

Pick Peptide Plug for

You run TRT alongside a GLP-1, peptides or HRT and want one timeline.
You need weekly-total-to-per-injection math, or free-testosterone estimation from labs.
You want cost per dose and a vial run-out date.
You want free calculators with no account and no subscription.
You want the half-life figures behind the level curve published with their evidence level.

Pick TRT Monitor for

Every plan is identical. No feature gating at any price.
AI-assisted import of blood test results, which we do not offer.
Blood markers plotted directly against reference ranges.
A purpose-built shareable report for a doctor.
Cheaper on the annual plan at £36/year.

Which should you pick?

For TRT alone, TRT Monitor is cheaper and has lab features we do not. Peptide Plug wins when TRT is one of several protocols, or when the vial and cost arithmetic matters as much as the log.

Common questions

Which is cheaper?

TRT Monitor on an annual plan, at £36/year (about £3/month) with no feature gating. Peptide Plug is $49.99/year, though it has a permanently free tier covering one active schedule plus all public calculators, where TRT Monitor offers a free first month.

Which is better if I only do TRT?

TRT Monitor is purpose-built for it, with AI lab import and reference-range plotting we do not match. If testosterone therapy is genuinely all you track, it is a strong choice.

Which is better if I also run a GLP-1 or peptides?

Peptide Plug, because those sit on the same timeline in one account. TRT Monitor is TRT-focused.

Does Peptide Plug estimate free testosterone?

Yes. The Free Testosterone Calculator uses the Vermeulen equation from total testosterone, SHBG and albumin, and is free with no account.

Do either give medical advice?

Neither. Both record and display what you enter. Dose decisions belong to you and your prescriber.

Try the free tools first

Every Peptide Plug calculator runs in your browser with no account and nothing stored.

Open the free tools

Tracking tool, not medical advice. Peptide Plug is an organization and calculation tool for adults 18 and older. It does not provide medical advice, diagnosis or treatment, and it does not recommend, suggest or verify any substance, amount, schedule or route. Calculators only perform arithmetic on the numbers you enter; double-check every result. Many compounds referenced on this site are not FDA-approved for human use, and products sold outside an approved supply chain are not verified for identity, purity or concentration. Peptide Plug does not sell, supply, source or link to sellers of any compound. Confirm every decision with a licensed clinician or pharmacist. In an emergency, call 911.

Age Verification