Log each dose your prescriber sets, plan your schedule and see simulated levels from published studies. Everything stays on your phone.
01
Each compound you track has its own page with three tabs: Info, Schedule and History.
Info shows your planned amount and route, how long it has been since your last dose, how many half-lives have passed, and roughly how much of that dose the model says is left.
Add a vial and the page also shows the amount remaining, the concentration, how many scheduled doses it covers and the date it runs out.
02
Enter the schedule your prescriber gave you as phases that run one after another, for example a starting dose for four weeks and then a higher one. A single-phase schedule is free; more phases are part of Pro. Each phase has its own amount, length and frequency: daily, every few days, weekly or on set weekdays.
The schedule drives your reminders, the calendar, the dashed part of the chart and the vial run-out date. You can also add it to Apple Calendar on iPhone, or to your phone's calendar on Android. Every amount is entered by you; the app does not suggest doses.
03
Every day is marked as taken, scheduled or missed. Tap a day to see what was logged or planned for it.
04
Every entry is kept with its date, time, amount and injection site. When you log a dose, a body map shows where you have injected recently and suggests the site you have used least.
05
An experimental tool that shows how the liquid added to a vial changes its concentration, and so the volume that holds a given amount, with every step of the working written out so you can check it. It appears once you switch on experimental compounds in Settings, Library. Open it from Settings, Tools or from the vial of a compound that is not an approved medicine, where the vial's amount and liquid are filled in. When you log a measure from that vial, a millilitre scale shows the volume for the amount you entered, with its cost.
It never fills in a dose and does not tell you what to take or draw. Approved medicines come ready to use and are not mixed, so it is not offered for them. Use it only for a product you are legally authorised to use, as your prescriber or pharmacist directs.
06
The library covers 72 compounds, from approved prescription medicines to research compounds that are not approved anywhere. Search by generic or brand name.
Each compound has an evidence grade: approved medicine, human trials, failed trials, animal studies only, or largely unstudied. Its entry lists what is claimed for it and the evidence behind each claim, known side effects, warnings, regulatory status in Australia and the US, and the sources used.
07
Simulated levels use a standard one-compartment model with the parameters from a published study, shown on the compound page with the full reference. For tirzepatide that is a 2024 population analysis of 19 studies and 5,802 participants.
Where more than one published set exists, you can choose which to use. Compounds with no published human data show no curve.
What VialOwl does, next to what we found on the websites of 13 other GLP-1 and peptide trackers.
| VialOwl | Typical tracker | |
|---|---|---|
| Dose log, reminders and calendar | Yes | Yes |
| Phased schedules, for example 2.5 mg then 5 mg | Yes | Some |
| Dilution calculator with every step shown (experimental) | Yes | Some |
| Level chart | Yes | Yes |
| The study behind the level chart, shown in the app | Yes | No |
| Evidence grade on every compound | Yes | No |
| Side effects and warnings next to the claims | Yes | Rarely |
| Phase 3 trial results, including dropouts | Yes | No |
| Watch app and a Lock Screen countdown | Yes | Rarely |
| No account, records kept on your phone | Yes | Varies |
Checked 26 September 2026. "Some" and "Rarely" mean a minority of the apps we looked at.
Safety information and the full library are always free.
Prices in Australian dollars, including GST, and the same on iPhone and Android. The App Store and Google Play show the price in your currency. Monthly and yearly subscriptions renew automatically unless cancelled at least 24 hours before the end of the period, in your Apple Account settings or in Google Play. Lifetime is a single payment with no renewal. A purchase stays with the store you made it in.
| FreeAUD 0 | One compound with a simple schedule, reminders, logging and simulated levels. The full library, trial summaries and all safety information. Restoring a backup. |
|---|---|
| VialOwl ProAUD 9.99 a monthor AUD 59.99 a year | Unlimited compounds, schedules with several phases, the calendar, calendar export, a weight goal and BMI, and encrypted backups. New subscribers get the first 3 days free. |
| VialOwl Pro LifetimeAUD 149.99 once | Everything in VialOwl Pro, paid for once. No subscription and nothing to renew. Restore it on a new iPhone with the same Apple Account, or on a new Android phone with the same Google account. |
Yes. Search the library by generic name, add it, and enter the schedule your prescriber gave you. Medicines with published human pharmacokinetic data show a simulated level curve.
No. You enter every amount yourself. The only schedules the app offers are dose steps quoted from the approved product information for a few prescription medicines, which you add only after confirming they were prescribed for you. Ask your doctor or pharmacist about dosing.
72 compounds, each graded by the strongest evidence behind it, with claims and the evidence for each, side effects, warnings, Australian and US regulatory status, and sources. Many are not approved medicines, and their entries say so. The library is information, not a recommendation to use anything.
An experimental tool, shown only when you switch on experimental compounds, that works out how the liquid added to a vial changes its concentration and the volume for an amount you enter, with every step written out. It never fills in a dose, does not tell you what to take, and is not offered for approved medicines that come ready to use. Use it only for a product you are legally authorised to use, as your prescriber or pharmacist directs.
Yes. Add what you paid for a vial and VialOwl shows the cost per mg, the cost of each measure you log, about how much a week costs on your schedule, and what you have spent.
On your phone, and a summary on your paired Apple Watch or Wear OS watch. There is no account. Backups are password protected files you keep yourself. Research updates and Recall search send compound names, and nothing else, to ClinicalTrials.gov and openFDA.
Yes. VialOwl is on Google Play, with the same features and prices as on iPhone. Android uses Health Connect where iPhone uses Apple Health, and Wear OS where iPhone uses Apple Watch. Backups move between iPhone and Android, so you can change phones and keep your records. A Pro purchase stays with the store you bought it from.
Yes, on Apple Watch and Wear OS. The watch app shows your next dose and simulated levels, and you can log a scheduled dose from your wrist. On iPhone there are also Home Screen and Lock Screen widgets, a Live Activity countdown and Siri shortcuts. On Android there are home screen widgets, a countdown notification on the lock screen and a launcher shortcut.
VialOwl is free for one compound, with a simple schedule, reminders, the full library and all safety information. VialOwl Pro is AUD 9.99 a month, AUD 59.99 a year, or a single payment of AUD 149.99 for life, and adds unlimited compounds, schedules with several phases, the calendar, calendar export, a weight goal and encrypted backups. New monthly and yearly subscribers get 3 days free.
VialOwl