Mole tracker app for Android
Notice every
mole change.
J-Skin measures your moles to the millimeter, compares photos over time and creates a PDF report for your doctor — all privately, on your phone.
See the change your eye can’t catch
The same mole 600 days apart. J-Skin overlays photos perfectly and calculates the difference in millimeters — you just drag the slider.
Designed for regular monitoring
From body map to dermatologist report — every step is simple and repeatable.
Every mole has its place
Front, back and 16 anatomical regions.
Repeatable photos
Exposure lock, ghost overlay, coin calibration.
4 modes
Privacy by design
No account, no cloud, no tracking. AES-256 encryption and PIN/biometrics.
PDF report for your doctor
Photo history, measurements and ABCDE assessment — ready for your visit in one click.
Your data never
leaves your phone.
No account
No registration or login required.
Zero tracking
No analytics or ads.
AES-256 encryption
Access protected by PIN or biometrics.
Your backup
Optionally on your Google Drive.
J-Skin vs other apps
| Feature | J-Skin | Other apps |
|---|---|---|
| Data stays on your phone | Usually sent to a server | |
| Automatic measurement in mm | Rarely available | |
| Auto photo alignment | — | |
| 7-coin calibration | None or 1 coin | |
| PDF report for doctor | — | |
| One-time payment | Usually subscription | |
| 5 interface languages | 1–2 languages |
Start free, unlock once
Try full functionality with no time limits. Pay once — no subscription.
Full version
- Unlimited moles
- All features and comparison modes
- Unlimited PDF reports
- Free updates forever
Frequently asked questions
Does J-Skin replace a visit to the dermatologist?
No. J-Skin is an educational tool for documenting and self-monitoring your moles over time. It does not diagnose and does not replace a dermatologist. Have any suspicious or changing mole checked by a doctor. Think of the app as a way to keep track of changes, not as a medical verdict. Read more: When to See a Dermatologist? Dermoscopy of Moles.
How often should I check and photograph my moles?
A skin self-exam is commonly recommended about once a month. Moles you are watching can be photographed roughly every 3–6 months to help you catch changes. This is general guidance only. If you are at higher risk, follow the advice of your own doctor. Read more: How often should you photograph your moles?.
What is the ABCDE rule?
It is a simple checklist for assessing a mole: A — Asymmetry, B — Border (irregular or jagged edges), C — Color (uneven, several shades), D — Diameter (over 6 mm can be a concern), E — Evolution, meaning changes over time. It helps you decide whether to see a dermatologist. Read more: The ABCDE Rule — how to self-assess a mole.
Are my photos and data safe?
Yes. Everything stays on your phone — no account and no cloud upload by default. Your data is encrypted and protected by a PIN or biometrics. You can optionally make an encrypted backup to your own Google Drive. You stay in control of where your data goes.
How much does J-Skin cost?
It is free for up to 2 moles with full functionality. A one-time purchase unlocks an unlimited number of moles. There is no subscription and no recurring fees — you pay once and keep using it.
What devices does J-Skin work on?
J-Skin works on Android phones running Android 8.0 (Oreo) or newer. It is a phone app that runs in portrait orientation. It is not designed for tablets or other operating systems.
Guides
Melanoma — the complete guide
What melanoma is, risk factors, the ABCDE rule, self-examination, prevention and when to see a dermatologist — the complete guide.
GuideThe ABCDE Rule — how to self-assess a mole
Five simple criteria to help you decide whether a mole needs a dermatologist visit. Learn what to look for and how to monitor changes regularly.
GuideHow often should you photograph your moles?
How frequently should you take mole photos to catch changes? We discuss risk factors, dermatologist recommendations and how J-Skin helps you stay on schedule.
GuideWhen to See a Dermatologist? Dermoscopy of Moles
When to see a dermatologist, what a mole check and dermoscopy involve, and how to prepare for your visit with a photo history.
Download J-Skin
Take care of your skin today.
A few minutes a month is enough to calmly monitor your moles.
Get it on Google Play