Your treatment, on the record.
SteadySkin is a private iPhone record for light therapy, creams, and medications - for vitiligo. Works with any NB-UVB setup: Daavlin, SolRx, Sperti, handhelds, or in-clinic sessions. Everything stays on your phone.
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A home NB-UVB course can involve many similar sessions that blur together. The device does its part on the schedule your prescriber sets. The phototherapy log is your part - the only durable memory the course has.
What is dose creep, and why does your clinician watch for it?
The dose your clinician prescribes is not a single number that holds for the whole course. Over months of sessions it gets adjusted: stepped up, held after a reaction, reset after a pause. Those adjustments follow the protocol your clinician set when the device was prescribed. None of those adjustments are yours to improvise, and this page will not suggest any. The point is narrower: changes accumulate. Between appointments the only thing keeping them grounded is a written record of what was prescribed, what was actually done, and when. “I think we went up a while back” is not something a clinician can act on. A dated line in a log is.
Why is redness that shows up later so easy to misremember?
NB-UVB redness is sneaky about timing: it often appears hours after a session - the evening treatment that looks fine at bedtime and pink the next morning. By the time you sit down three days later to think about it, it is genuinely hard to say which session caused it. It is just as hard to say how long it lasted, or whether it was worse than the last one. A two-line note written the same day beats a careful reconstruction written Friday. A pattern of those notes is exactly what your clinician wants to see before deciding anything.
What do you say when the dermatologist asks, “How’s it been going?”
Practical tip - not clinical advice
A common blind spot: remembering exactly when and where
A dermatologist asking which arm a new patch appeared on, or exactly when, is a question that memory alone often gets wrong, even for something looked at daily. That is why a dated record can help; what your clinician needs may be different.
Where do you get a log you can start today?
Right here. It is a one-page PDF that prints on letter paper, with columns for the date, body areas treated, skin response, and notes. Clip it to the device or keep it in the goggles case.
Free printable session log (PDF) - no email required (opens in a new tab)
Practical tip - not advice
Why a paper log still helps
A paper log is easy to start and easy to lose track of - a folded page in the wrong jacket pocket is a common way a record stops. Use whichever record format you can actually maintain and that your care team can understand.
Will keeping the log become a second chore?
It should not, and SteadySkin is being built around that. Each planned treatment is recorded as completed, partly completed or changed, held, skipped, or not recorded - and gaps are part of the record too. Every session and gap is timestamped, so a restart conversation after a pause can be precise instead of apologetic. Corrections and complete history are planned to stay free: fixing yesterday’s entry is part of keeping an honest record, not a premium feature.
Can you trust your memory about whether skin is changing?
Memory is a poor measuring tool. SteadySkin is designed so you can compare monthly photos side by side when you choose to take them: the same area, with notes about the setup. They stay private on your device. iCloud does not back up the app’s photos, and there is no SteadySkin server for them to go to. The app does not calculate a clinical severity score, and it does not declare that treatment worked. It shows you January next to April and lets you and your clinician draw the conclusions.
What does your clinician actually get out of this?
A standard provider report is planned for SteadySkin. It is planned to carry your current plans, and recorded treatment events with holds and skips. It is also planned to carry skin reactions and notes linked to their source records, dated observations, medication and plan changes, and the questions you chose to bring. The report is made to share or print. The standard report does not include photos. SteadySkin Plus is planned to add customized reports with selected photos and saved comparisons, plus a photo timeline. See what the report is planned to contain.
Who else can see this record?
No one, and by architecture rather than by promise. Your record lives on your phone, not on SteadySkin servers. You do not need a SteadySkin account, and no cloud copy of your record, account sync, web access, or caregiver sharing is offered. No ads, and no sale of your data. Privacy Lock covers the app using Face ID, Touch ID, or your passcode - handled by iOS, so SteadySkin never receives or stores your biometric template. Data leaves the phone only when you choose: download it as a spreadsheet (CSV), or share or print the provider report. The details live in the privacy policy.
Will there be a cost?
SteadySkin - the free app, not a demo - is planned to include core treatment and safety logging with complete history. Pricing and the exact feature split are still being finalized and will be published closer to launch. See app pricing.
A Founding Member offer is planned.
The plan: your first year of SteadySkin Plus for $19.99 on the annual plan, for eligible new subscribers. After that first year, it renews at the standard annual price the App Store shows, unless you cancel. It is planned to include a founding badge, an opt-in founders-page credit, and a direct feedback line. Details and reservation open once the offer is configured in the App Store.
Is this medical advice?
No. SteadySkin never recommends doses or treatment changes. It records what you and your clinician decided.
Which devices work?
All of them - the record is yours, not the manufacturer’s.
I do phototherapy at the clinic. Is this for me?
Yes. Sessions, creams, photos, and reports work the same.
What happens to my photos?
They stay in the app’s private, Face ID-protected storage on your phone. Deleting the app deletes them; export first.