The first-generation ZenFones were announced at the 2014 Consumer Electronic Show in Las Vegas, Nevada; it uses the same "Zen" moniker originally introduced with the Asus ZenBook laptops.

The ZenFone 5 is the mid range of the series and includes a 5-inch 1280×720 HD IPS display protected with Corning Gorilla Glass 3.

The flagship phablet model (ZE551ML) launched with Android 5.0 Lollipop running Asus's custom Zen UI and has a 5.5" Full HD (1920×1080) IPS display.

The ZE500CL, the low cost variant, comes with a 5" HD display, an Intel Atom Cloverview CPU, 2 GB of RAM, a single MicroSIM slot, 8/2 MP rear and front cameras, and a 2500 mAh battery.

[19] It is basically a ZE551ML with extended memory and a special back cover dubbed "Illusion Case", which has a 3D polygonal pattern that gives it a more premium look and feel than the original ZE551ML.

Other markets offered the Deluxe Special Edition with red bezels, extended 256 GB of memory and Intel Atom Z3590 2.5 GHz processor.

[20] Colors offered are white and blue with purple shade, while the special edition available in silver or carbon fiber pattern.

[30] The third generation ZenFone series drops Intel while retaining Qualcomm and MediaTek as CPU suppliers.

First unveiled at CES 2017, the ZenFone AR is the first smartphone to support the Tango augmented reality and Google Daydream VR platforms and to be offered with 6 or 8 GB of RAM.

The ZenFone AR is equipped with a 23 megapixel camera with optical hardware that takes advantage of Tango applications and extreme performance for gaming and data.

The main feature of the flagship ZenFone 4 is its dual lens camera, which enables wide-angle photography.

The ZenFone 6 features a rotating camera in an attempt to reduce bezels and provide an all-screen front.

There is a dual camera setup on the phone, which normally resides on the back, but rotates when needed to become a selfie shooter.

The ZenFone 7's display increases to 6.67 inches and switches to an AMOLED panel with a 90 Hz refresh rate.

They are released later on 13 May 2021, features a Qualcomm Snapdragon 888 5G chipset, with Corning Gorilla Glass 6 (Victus in Compact ver.)

", this time, ASUS only released one model, the aforementioned ZenFone 11 Ultra, dropping the small-sized phones due to poor sales coming from its predecessor.

The phone was released to the market on 14 April 2024, with a Qualcomm Snapdragon 8 Gen 3 chipset, with Corning Gorilla Glass Victus 2 protection and support for 5G networks.

It has a 5500 mAh battery and includes IP68 water resistance and an in-display fingerprint sensor, which was last seen on ZenFone 8 Flip.