https://skinlately.com/ SkinLately is a skincare habit coach for iPhone. You take a 10-second selfie in the same light every day; it gives you a Glow Score across five cosmetic-level dimensions — hydration, texture, calmness, clarity, under-eyes — plus three things to do today, and keeps your streak. It shows whether your routine is working for you, relative to your Day 1. It is not a diagnosis tool and does not rate your looks. Free tools on the web; the daily scan is a subscription ($2.99/week or $29.99/year, 3-day trial). en-us https://skinlately.com/how-it-works/ https://skinlately.com/how-it-works/ Same light, same spot, ten seconds. How the five cosmetic dimensions and the Glow Score work, what they are not, and where the free line sits. https://skinlately.com/guides/is-my-skincare-working/ https://skinlately.com/guides/is-my-skincare-working/ The mirror cannot tell you. Here is the 30-day, one-variable photo protocol that can — the six things that must hold still, what to look at, and how to read the result. https://skinlately.com/guides/skin-progress-photos/ https://skinlately.com/guides/skin-progress-photos/ Same window, same time, same distance, bare face, no filter. The seven variables that make two skin photos comparable — plus a free lighting checker and alignment tool. https://skinlately.com/guides/how-long-skincare-takes-to-work/ https://skinlately.com/guides/how-long-skincare-takes-to-work/ Six weeks minimum, up to three months for tone — the AAD's own guidance. Why the 28-day skin cycle is a myth, what shows up when, and when quitting is the right call. https://skinlately.com/compare/best-skincare-tracker-apps/ https://skinlately.com/compare/best-skincare-tracker-apps/ 8 skincare tracking apps side by side: what each reads, how often, whether it recommends products, and what it costs. Every fact dated and sourced. https://skinlately.com/compare/skinlately-vs-umax/ https://skinlately.com/compare/skinlately-vs-umax/ Umax scores how you look. SkinLately tracks whether your routine changed anything, against your own Day 1. Verified prices, categories and age ratings. https://skinlately.com/compare/skinlately-vs-skinstreak/ https://skinlately.com/compare/skinlately-vs-skinstreak/ Both ask whether your skincare worked. Skinstreak is free and recommends products; SkinLately is a subscription that recommends nothing. Daily vs fortnightly, and more. https://skinlately.com/timelines/niacinamide/ https://skinlately.com/timelines/niacinamide/ Four to eight weeks for visible change, earliest shifts inside two weeks, tone last. What the sources say, and how to run a fair 30-day single-variable test. https://skinlately.com/timelines/hyaluronic-acid/ https://skinlately.com/timelines/hyaluronic-acid/ It works the same day and largely resets overnight, which makes it the easiest ingredient to overrate. What is worth measuring over 30 days instead. https://skinlately.com/timelines/vitamin-c/ https://skinlately.com/timelines/vitamin-c/ Eight to twelve weeks for tone, sometimes brightness at four. Why it is the worst candidate for a two-week verdict, and how to test it honestly. https://skinlately.com/timelines/retinol/ https://skinlately.com/timelines/retinol/ Commonly a twelve-week ingredient, and weeks two to six often look worse before better. What the sources say, and why week three is when people quit. https://skinlately.com/timelines/ceramides/ https://skinlately.com/timelines/ceramides/ Fast in how skin feels, slow in how it looks: days for comfort, two to four weeks for anything visible. Why the floor matters more than the peak here. https://skinlately.com/research/same-light-study/ https://skinlately.com/research/same-light-study/ An open study of how far a skin reading moves when only the light changes. Method published before the data, consistency not accuracy, raw CSV released. In progress.