How do I prove to myself that I actually changed?
The reason you cannot tell whether you changed is not a failure of self-awareness. It is a structural problem with memory: the same mind doing the measuring also rewrote the baseline.
Why the inside view fails
Memory does not store the past like a photograph. It reconstructs the past using your current beliefs, so the version of you from three years ago gets quietly updated to seem more like who you are now. When you try to remember how you used to think about conflict, or money, or what you deserved, you are largely remembering a story you have already edited. This is called memory conformity, and it happens without any conscious intent. The practical result is that genuine change can feel like nothing happened, and the absence of change can feel like growth, because both get smoothed into whatever narrative makes sense today. You cannot solve this by trying harder to remember accurately. The instrument is broken for this particular measurement.
What actually shifts in a person
The changes that are real tend to show up in behavior under pressure, not in calm self-description. You do not notice that you stopped apologizing for having an opinion until someone points out that you used to do it constantly. You do not notice that you now leave situations that exhaust you until you realize you stayed in one for four years and would not stay for four weeks today. The things that shift are usually thresholds and defaults: what you tolerate before you speak, what you reach for when you are scared, how long you wait before you say the true thing. These are not dramatic. They accumulate in small choices that nobody clocks in real time, including you.
What holds even when you change
Some things move slowly enough that they look fixed. The way you handle uncertainty under time pressure tends to stay recognizable across decades. The topics you find it genuinely difficult to discuss without defensiveness are usually old. So is the gap between how you treat the people you rely on versus the people who rely on you. Recognizing what has held is not pessimism. It is the context that makes real movement legible. If you can name two things that have not changed, the thing that did change becomes visible by contrast, and you stop discounting it as though it does not count.
What works as actual evidence
The only honest source of evidence for change is a record made before the change, which you cannot revise after the fact. A message you sent five years ago, a journal entry, a list you made of what you wanted your life to look like, a note someone wrote you about who you were then. These are useful precisely because they do not update themselves. When you read them, you sometimes feel surprised by how differently you see the same thing now, and that surprise is the closest thing to proof available. The problem is that most people do not have enough of these, because they were not thinking about evidence at the time. LUX starts a dated record on the day you begin, with six open questions that take about eight minutes, and it keeps the earlier version instead of overwriting it as you add to it over time. The record grows and compresses into readings that describe who you are now, and the earlier entries stay exactly as they were, which is the one thing memory will not do.
When this runs your life, it usually traces to one underlying pattern. For this, it is most often the Keeper rhythm, the thing under the behavior.
Where to take this
You cannot check this against memory, because memory quietly edits the earlier version to agree with the current one. The drift checker takes something you wrote a while back and something you wrote recently and names what actually moved and what held. Free, no signup, and nothing you paste is kept.