Yes, completely. Online defensive driving is accepted by every Arizona court for the diversion program, and the state built the plumbing to match: your school transmits your completion to the court electronically within 24 hours of finishing, no certificate to mail, no clerk visit.
The credential to check is distinctive here. Arizona's program is run by the Arizona Supreme Court, not the MVD, and the court certifies each school and each delivery method. A school that's legitimate for Arizona will hold and display that Supreme Court certification, and Arizona is unusually strict about what gets certified, requiring online curricula to be substantially distinct rather than relicensed copies of one another. If a site can't show Arizona Supreme Court certification, its certificate is worthless here regardless of how many other states approve it.
Format settled, the two rules that actually decide outcomes are timing rules: eligibility runs once every 12 months measured violation date to violation date, and your course must be done at least 7 days before your court date. The online course being available at midnight in your kitchen is exactly why the 7-day rule catches people; available-anytime breeds started-too-late.
Every Supreme Court-certified online school we track is compared on the Arizona page, what completion buys, full dismissal, nothing reported to insurers, is on our points page, and the fee layers are on our cost page.