Earlier today, we issued a press release and an earnings presentation summarizing our results. Reconciliation to the most comparable GAAP measures can be found in the earnings presentation. These statements are subject to risks and uncertainties that are described in the earnings presentation and in our SEC filings. I will also build on the strategic update and longer-range outlook we shared on our last call in March.
I'll turn the call over to Jeff to walk through our financials and outlook. Adjusted free cash flow, including swaps, was at $414 million, and adjusted earnings per diluted share was $0.23, up 10% year-over-year. Our durable recurring monthly revenue was $359 million, flat versus prior year. Gross revenue attrition remained at 13.1%, and our revenue payback period was 2.3 years.
Cumulatively, these results reinforce the durability of our model and progress strengthening ADT's business, prioritizing high-quality ads and more efficient acquisition channels. As discussed on our last call, we acquired Origin AI in February which will add AI-driven ambient intelligence technology into the ADT+ platform, creating a new layer of home intelligence. Concurrent with this acquisition, we also entered into a long-term technology licensing agreement with Verisure reinforcing the global relevance and scalability of this platform and the practical use cases already deployed in Europe. As we deepen our plans to deploy this sensing technology and work with the team, I'm even more excited about the role these capabilities will play in our evolution to proactive peace of mind.