Free · answers stay in the browser
How long an opened jar stays good
The open-jar symbol on a carton, with a number and the letter M, is the period after opening in months. A 12M mark means twelve months after you open it, if you stored it away from heat.
This helper uses typical windows when you do not have the symbol in front of you. Vitamin C that has turned deep brown and sunscreen past its date are the two worth replacing even if the jar looks fine.
- Cost
- Free
- Time
- A few questions
- Signup
- None
- Data
- Not stored
A cream or lotion is often used within 12 months of opening if the jar has no PAO mark. About 9 months left on that generic window. The symbol on your carton overrides this.
In the app
Want a record of opened product expiry, not a one-off?
Opened product expiry settles the question above. The app is where that decision can be checked against six skin scores over the following weeks.
- Six saved scores: hydration, texture, tone, acne, pores, and redness
- A morning and evening routine built from the scan
- The same face, week after week, so a change shows up as a trend
Scan with your phone. iPhone opens the App Store. Android opens Google Play.
The science
What the opened product expiry calculator decides, and what it leaves alone
- 01
A structured question, not a photo score
A calculator fits when the answer depends on behavior, a label, or a number you already know. A camera cannot see how a product feels, what else is in the routine, or whether a breakout started after a new active.
- 02
How this page reaches a label
Work through the prompts in order. The result follows from the answers, in this browser, and the answers are not stored.
Tied answers stay tied. If two labels earn the same weight, both are shown, because forcing a single winner would invent confidence the answers did not have.
- 03
What the label means, and what the app records
Write the open date on the bottle with a marker.
The AISkincare app keeps a scan: hydration, texture, tone, acne, pores, and redness, then builds a morning and evening routine from those scores. This page answers once and does not store the photo.
Use the label to choose a next step, then check it against a scan if the question was about skin rather than about a product or a style.
- 04
Where this kind of check runs out
Ingredient charts are estimates from published lists, not a lab test of your bottle and not a medical clearance.
If the honest answer to a prompt is 'it depends' or 'I am in pain,' stop and treat that as the result. The page cannot examine you.
How to use a opened product expiry result
Write the open date on the bottle with a marker. Heat and a dirty finger shorten the window. Do not use a product that smells new and wrong or that changed color.
Take the actions on the result card as a short list, not as a diagnosis.
How to answer so the label is worth having
Answer for the last two weeks, not for your best week or for a photo you wish you had taken. If a prompt is about a product, use the ingredient list on the bottle you own, not a similar product from another brand.
One pass is enough. Changing answers until the label feels flattering wastes the check.
A label today, a score over the month
Opened product expiry can be retaken when the routine changes. It will not show whether redness or texture actually moved. That comparison is a scan in the same light, saved in the app.
The QR code under the tool sends an iPhone to the App Store and an Android phone to Google Play.
What the opened product expiry calculator cannot decide
Ingredient charts are estimates from published lists, not a lab test of your bottle and not a medical clearance.
It cannot see beneath the skin, predict a reaction to an ingredient you have never used, or replace a clinician for a spreading rash, a changing mark, or painful acne.
How to use the result
- Write the open date on the bottle with a marker.
- Heat and a dirty finger shorten the window.
- Do not use a product that smells new and wrong or that changed color.
Where to go from here
If one part of the result stood out, open the tool that asks only that question. Each one states its limit in the same place, and each one links back to a guide when a longer explanation helps.
- Routine cost calculatorAdd what you paid and how long each product lasts. See the monthly cost and which bottle is most of the spend.
- Ingredient conflict checkerPaste the actives you use and see which pairs to put on different days. Some famous conflicts are real irritation risks. Others are overstated.
- Ingredient list decoderPaste a product's ingredient list and get a plain-language note on the actives and additives this guide recognizes. Unknown names stay unknown on purpose.
- Malassezia ingredient checkPaste an ingredient list and see which entries are often avoided in malassezia-aware routines. This is not a test for fungal acne and not a treatment.
Ingredient charts are estimates from published lists, not a lab test of your bottle and not a medical clearance.