The problem
You're plotting half-lives in a spreadsheet and timing bloods by gut feel.
Web-based plotters give you a graph but no app, no reminders, no bloodwork integration. The few apps that exist don't run on both platforms. Your spreadsheet has 6 months of data but no PK curves. You've built your own system out of 4 tools, and it still doesn't tell you when to draw blood relative to your trough.
What TRT users get
Built around your protocol.
Pharmacokinetic modeling
Real PK curves based on published half-life data for every testosterone ester. See your estimated serum levels between pins — peaks, troughs, and steady-state accumulation.
Cypionate · Enanthate · Propionate · Undecanoate · Sustanon
Bloodwork with trough context
Log your labs against reference ranges that account for where you are in your injection cycle. Time your draws against your actual trough, not a calendar guess.
Total T · Free T · E2 · SHBG · Hematocrit · PSA · Trend tracking
Multi-compound protocols
Test + HCG + AI is three compounds with three schedules. Track them all. Each gets its own PK curve, its own reminders, its own dose log.
Testosterone + HCG + Anastrozole · MENT · Primo · Full stacks
Dose calculators
Concentration × volume = dose. Enter your vial concentration and desired dose — Doseline calculates the draw volume. Simple, but one less thing to get wrong.
mg/mL conversion · Multi-ester blends · Reconstitution math
Injection site rotation
Visual body map. Log where you pinned, flag PIP, see rotation history. Glutes, delts, VG, quads — tracked with dates and notes.
Site tracking · PIP logging · Rotation reminders · Scar tissue prevention
Free tools for TRT
Try these tools — filtered for your community.
Medication Database
Testosterone and ancillary compound profiles
Split Dose Calculator
Divide weekly doses into multiple injections
Medication Plotter
Visualize testosterone levels over time
Free T Calculator
Estimate free testosterone from Total T and SHBG
Bloodwork Reference
TRT-specific reference ranges
Vial Calculator
How long your vial will last
Switching from something else?
If you're coming from a spreadsheet, web plotter, or single-platform app, here's what's different.
Privacy
Your protocol stays between you and your phone.
Whether you're on prescribed TRT or self-administering, your injection history is sensitive data. Doseline stores everything locally — no account, no cloud, no data mining. Your protocol is yours.
No account required
Every feature works without signing up.
No cloud by default
Sync is opt-in. Data starts and stays on-device.
End-to-end encrypted sync
Even with sync, we can't read your data.
Biometric lock
Face ID, Touch ID, or fingerprint.
Ready to simplify your TRT protocol?
Join the waitlist. Free tier included, no credit card, your data stays on your device.
Available soon on iOS and Android.