The phrase "actually noticeable" is correct and usable in written English.
It can be used to emphasize that something is indeed perceivable or evident, often in contrast to what might be expected.
Example: "The changes in the design were actually noticeable after the updates were implemented."
Alternatives: "clearly visible" or "evidently apparent".
Hailed as a "defensive powerhouse", full-back Cullen is actually more noticeable for her pivotal role in penalty corners, from which she has the capability to score game-changing goals.
"I've debated [scanning and uploading] some newer authors and books," one admits, "but I would need to... resolve the moral dilemma of actually causing noticeable financial harm to the author whose work I love".
But green consumerism has a long way to go before it's consistent and credible and actually has a noticeable effect on the planet.
"It could actually make a noticeable difference to accident statistics [if just women let off fireworks] – but the most important thing is not to use fireworks recklessly," Mr Stokkeland told Norwegian news service NRK.
In the News would like to dispute the veracity of this final assertion as, unless Britney intended to employ an army of impersonators wearing full Islamic dress, the singer, emerging from a Beverley Hills mansion or courtroom might actually be quite noticeable.
Practicing gratitude, though it sounds like a New Age mantra that has little grounding in science, actually had a noticeable impact on the lives of participants in a small study conducted by Lyubomirsky.
And some of the developments with his T-800 in the closing moments actually prompted a noticeable groan from the audience I saw it with.
But even if there's a shifting tide in terms of how alternative nightlife relates to left-wing politics, will it actually have any noticeable impact on politics?
Lawton notes that Nintendo avoids providing evidence that its Brain Age series actually leads to noticeable improvements in brain functions, and that it instead "is careful not to claim that Brain Age is scientifically validated, merely stating that it is an entertainment product 'inspired' by [Dr. Ryuta Kawashima's] work".
