That phone spreadsheet you're squinting at every injection day? There's a better way. A much, much better way.
You know the ritual. Open Excel or Google Sheets on your phone. Wait for it to load. Pinch-zoom until your row is visible. Carefully tap the right cell — not the one next to it, not the one above it, the right one. Type your dose. Squint at the formula bar to make sure it didn't break. Scroll up to check the total. Close the file. Wonder if it actually saved.
Congratulations. You just spent three minutes tracking something that should take five seconds. And somewhere in the process, there's a 50% chance you nudged a formula that will silently give you wrong numbers for the next two weeks.
Using a phone spreadsheet for health tracking is the most impressive thing people do for no reason. It's the spreadsheet equivalent of doing your taxes by hand when TurboTax exists — technically possible, genuinely painful, and completely unnecessary.
Spreadsheets are brilliant for financial models, inventory lists, and things that live on a laptop with a keyboard. They are not brilliant for tracking injection timing at 7am with your thumb. Here's exactly why.
None of this is your fault. Spreadsheets aren't bad tools. They're just the wrong tool for tracking doses, half-lives, and reconstitution math on a phone screen, in real time, while you're trying to get on with your day.
| Feature | Halflife — Peptide & GLP-1 Log | Spreadsheets (Excel / Google Sheets) |
|---|---|---|
| Ease of Use on Phone | ✓ Built for mobile — one tap to log, everything fits the screen | ✗ Designed for desktop — pinch-zoom, tiny cells, wrong taps |
| Automatic Math | ✓ Half-life curves, active levels, and reconstitution calculated instantly — no formulas to build or break | ✗ You build the formulas. You maintain them. You fix them when they break. |
| Error Prevention | ✓ Nothing to accidentally delete — the app handles all inputs with guided fields | ✗ One wrong tap can silently corrupt your data with no warning |
| Beautiful Design | ✓ Color-coded visual dashboard — your entire protocol at a glance | ✗ Gray grid cells on a white background. That's it. |
When you open Halflife — Peptide & GLP-1 Log, you see a color-coded visual dashboard of every compound in your protocol. Your tirzepatide level. Your peptide window. When each is due next. All of it — immediately visible, no scrolling, no formulas, no squinting.
Tap to log a dose. The math updates instantly. Half-life calculations, active level estimates, reconstitution tracking — it all happens automatically, using FDA-sourced pharmacokinetic data from our compound database. The same math you were trying to build in Excel, done correctly, every single time, without you touching a formula.
And it never breaks. There's nothing to break.
Here's the part where you expect a catch. There isn't one. Halflife — Peptide & GLP-1 Log is free to download. You can add your compounds, start tracking, and see your entire protocol on a real dashboard in the time it used to take you to open your spreadsheet and wait for it to load.
The app covers 45+ compounds out of the box — GLP-1s, peptides, TRT, and more — all pre-loaded with their pharmacokinetic parameters so you don't have to find, verify, or enter any data yourself. It's the spreadsheet you always wanted to build, already built, and already correct. Check out our real-world case studies to see how people running full stacked protocols track everything in one place.
Your health is worth more than a gray grid of cells. It deserves something that's actually built for it.
Free to download. Your entire protocol on one beautiful screen — set up in minutes, not spreadsheet-hours.
↓ Download Halflife FreeFair enough. Keep the spreadsheet as a backup if that makes you feel better. But download Halflife, add one compound, and log one dose. Then look at both screens and decide which one you want to open next injection day.
We already know what you'll choose.