The Infinix Smart 9 features a standard design with flat edges and a frame, a squircle camera island, and a grainy finish on the back. It has a better-fleshed-out appearance than its predecessor, the Infinix Smart 8, and enjoys an IP54 rating for dust and splash resistance. The device is available in Metallic Black, Neo Titanium, Mint Green, and Sandstone Gold color options. The phone has a 6.7-inch IPS a-Si LCD panel with HD+ resolution (720 x 1600 pixels) and a refresh rate of up to 120Hz, offering a typical brightness of 500 nits. The screen also maintains responsiveness even when used with wet and greasy hands.

The Infinix Smart 9 is powered by the MediaTek Helio G81 processor, an octa-core chipset with 2x Cortex-A75 cores at 2.0 GHz and 6x Cortex-A55 cores at 1.7 GHz, paired with Mali-G52 MC2 GPU. The device comes with either 3GB or 4GB of RAM, which can be doubled through software means. Storage options include 64GB or 128GB, with support for external expansion up to 2TB via a MicroSD card. The phone runs on XOS 14.0, based on Android 14 (Go Edition).

The rear camera setup includes a 13MP primary shooter coupled with an undisclosed auxiliary unit. The front features an 8MP snapper for selfies and face scanning. The Infinix Smart 9 is equipped with a 5000mAh non-removable battery, supporting 10W wired charging. The phone also includes dual speakers with DTS sound, clear dialogue, and a headphone jack.

The Infinix Smart 9 offers a balanced combination of a large display, decent performance, and essential features at an affordable price point. With its 120Hz refresh rate and expandable storage, it caters to users seeking a reliable entry-level smartphone.