White-label PageSpeed reports are how agencies show ongoing care without teaching every client a third-party UI. The report is only as good as the history behind it.
What clients expect in the PDF
Your logo (or theirs), the period covered, the URLs that matter, LCP/INP/CLS with clear lab-versus-field labelling, and a short narrative of what changed. They do not need every Lighthouse audit ID. They do need to trust that the numbers were not screenshots from unrelated Tuesdays.
One-off export vs retainer cadence
GTmetrix and similar tools can produce useful PDFs from a session. That fits investigations and launch packs. Retainer reporting needs a cadence: the same templates, comparable dates, and less manual assembly each month. Apogee Watcher targets that second shape with scheduled runs and white-label PDFs on Professional and above. Confirm current plan limits on the pricing page before you promise a client.
Operational tips
Agree the URL set in the SOW. Freeze the chart definitions so month two matches month one. Keep diagnostics out of the monthly pack unless a regression needs a waterfall appendix. Clients pay for clarity, not for proof that you can operate five tools.