# Assay: Skin & Acne Tracker — Skincare Diary, Progress Log

> Skincare Diary, Progress Log (iPhone/iPad app by Ting Ting Xu.)

- Source: https://appshunter.io/ios/app/assay-skin-and-acne-tracker/id6802159311 (this page in markdown: same URL + `.md`)
- Developer: [Ting Ting Xu](https://appshunter.io/developer/1896719164)
- Category: Health & Fitness, Lifestyle
- Price: Free
- Age rating: 4+
- Requires: iOS 16.4 · 68 MB
- Languages: American English
- Released: 2026-09-26
- Data updated: 2026-10-21

## What is Assay?

You change five things at once. So you never learn which one worked. Assay changes one.

HOW IT WORKS

1. THE BASELINE: For the first 7 days you change nothing about your routine. That week is the baseline, and it is there because your face already moves on its own. It drifts with sleep, weather, stress, and overall health. Until you know how much your skin moves when nothing is happening, an after photo cannot tell you anything.

2. THE SCAN: Then you start the care product, and only that product. You log 1 photo a day, lined up with the camera guide so your framing stays put. Tests run for 28 days by default. You can run longer when the question needs it, anywhere from 21 to 182 days, because a spot treatment might work fast while a retinoid often looks worse at 4 weeks and better at 12.

3. THE LOCK: Assay measures three things in your daily photos: redness, texture, and evenness. On day 1 you pick what you are testing for, from acne, redness, texture, ageing, or just curious. That choice locks. It cannot be edited later. Picking which measure to report after you have seen what moved is how a test gets talked into a result it never produced.

THE VERDICT

At the end you get 1 of 4 answers:
* The product had a measurable effect.
* It had no measurable effect.
* It made things measurably worse.
* Inconclusive.

Inconclusive is a rule here, not a shrug. If you missed too many days, Assay says so and stops. It will not put a confident number on a fortnight of gaps, and it will not dress up a thin result to feel worth the wait. Most of the time it will tell you your product did nothing, because most of the time that is true.

THE RECEIPTS

You are asked what the product cost on day 1. When the verdict comes, it arrives next to that number.

PRIVATE BY DESIGN

Your photos never leave your device. All image analysis happens locally on your phone, and only your basic experiment text data syncs to your account.

Assay is for anyone who has spent real money on a serum and still has no idea whether it worked. Pick the product you are least sure about and start there.

Assay does not diagnose skin conditions and is not a substitute for a dermatologist.

Assay is free while it is new. There is nothing to buy inside it.

Terms of Use: https://getassay.pages.dev/terms
Privacy Policy: https://getassay.pages.dev/privacy

## Is Assay safe?

Not enough ratings yet to assess Assay.

## Is Assay legit?

Assay: Skin & Acne Tracker has limited verification signals. The AppsHunter Legitimacy Score for Assay is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-09-27

No release notes.

## Apps similar to Assay

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Derm AI: Face Skincare](https://appshunter.io/ios/app/derm-ai-face-skincare/id6755340014) | — | Free | Health & Fitness |
| [AcneTrack – Your Acne Journey](https://appshunter.io/ios/app/acnetrack-your-acne-journey/id6743371480) | 4.7 (904) | Free | Health & Fitness |
| [Lose Belly Fat with Fit & Flat](https://appshunter.io/ios/app/lose-belly-fat-with-fit-and-flat/id1645745801) | 4.5 (66) | Free | Health & Fitness |
| [HiFuture Fit](https://appshunter.io/ios/app/hifuture-fit/id6453360806) | 4.5 (40) | Free | Health & Fitness |
| [Period Tracker: Natural Cycles](https://appshunter.io/ios/app/period-tracker-natural-cycles/id1064911742) | 4.7 (1,319) | Free | Health & Fitness |
| [Skincare Routine: BasicBeauty](https://appshunter.io/ios/app/skincare-routine-basicbeauty/id1571959428) | 4.7 (608) | Free | Health & Fitness |

## More apps by Ting Ting Xu

- [OnLock - Study Timer](https://appshunter.io/ios/app/onlock-study-timer/id6770142774)

All apps by Ting Ting Xu: https://appshunter.io/developer/1896719164

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-21.*