Redmi is a sub-brand owned by the Chinese electronics company Xiaomi. It was first announced in July 2013 as a budget smartphone line, and became a separate sub-brand of Xiaomi in 2019 with entry-level and mid-range devices, while Xiaomi itself produces upper-range and flagship Mi phones. Redmi phones use the Xiaomi MIUI user interface on top of Android. Models are divided into Redmi (entry-level), Redmi Note and Pro (mid-range), and Redmi A (low-end), along with Redmi X (mid-range) and Redmi K (mid-range/high-end). In addition, the unrelated Mi A Android One series is also positioned in the similar market segment with Redmi devices, despite being part of the upper-range Xiaomi Mi lineup. The most significant difference from other Xiaomi smartphones is that they use less-expensive components and thus have lower prices while retaining higher specifications. In August 2014, The Wall Street Journal reported that in the second quarter of the 2014 fiscal year, Xiaomi had a market share of 14% of smartphone shipment rankings in China. Redmi sales were attributed as a contributing factor toward this gain in shipment rankings.
The first Redmi phone, released in 2013, was first launched on Xiaomi's website, with consumer sales beginning on 12 July 2013.
On 13 March 2014, Redmi announced that their phones had been sold out in Singapore alone, eight minutes after being made available to buy on Xiaomi's website. Criticism regarding the release of Redmi phones included the notion that the firm may be exaggerating its sales by releasing them in small batches, causing them to quickly sell out.
On 4 August 2014, The Wall Street Journal reported that in China's smartphone market, Xiaomi overtook Samsung in the second-quarter of the 2014 fiscal year with a 14% market share in smartphone shipment rankings, while Samsung had a 12% market share during this time. Yulong and Lenovo both had a 12% market share during this time. Redmi sales were attributed as contributing to Xiaomi's increased shipment rankings in the smartphone market. Conversely, in the first-quarter of 2014, Xiaomi held a 10.7% market share.
The Redmi Note 3 launched on 24 November 2015; unlike its predecessor, it does not have a user-changeable battery or microSD slot. It uses the Mediatek Helio X10 Octa-core 2.0 GHz Cortex-A53 SOC with the PowerVR G6200 GPU. The Snapdragon variant of the phone, released later the same year, is based on the Snapdragon 650 and has microSD support.
On 25 August 2016, Xiaomi unveiled the Redmi Note 4, powered by MediaTek's Helio X20 deca-core processor clocked at 2.1 GHz. The device has 2 GB RAM and 16 GB of internal storage. It has a 5.5-inch Full-HD display and a 13 MP rear camera and 5 MP front camera. It runs on Android 5.1 Lollipop and is powered by a 4,100 mAh battery.
In November 2016, Xiaomi released its new budget phone, Redmi 4. It has a polycarbonate body, dual-SIM support and runs on MIUI 8 based on Android 6.0.1 Marshmallow. The Redmi 4 has a 5-inch 720x1280 pixels display, is powered by a 1.4 GHz octa-core processor, and has 2GB of RAM.
In January 2017, the Xiaomi Redmi Note 4x based on Qualcomm Snapdragon 625 Chipset became the company's first major launch of 2017. It is an upgraded version of the previously released Redmi Note 4 based on the MediaTek Helio X20 chipset. The device is known as Redmi Note 4 in regions where the original Redmi Note 4 was not released.
In December 2017, Xiaomi unveiled the Redmi 5 and 5 Plus. They are the first phones in the Redmi series with an 18:9 screen aspect ratio. The EU release was set to January 2018 and prices were set to €170 for the Redmi 5 and €215 for the Redmi 5 Plus.
In February 2018, Xiaomi unveiled the Redmi Note 5 and 5 Pro. They are the first phones from Xiaomi to feature facial recognition.
In May 2018, Xiaomi unveiled the Redmi S2.
In September 2018, Xiaomi unveiled the Redmi Note 6 Pro. It is the first phone in the Redmi series with four cameras (two cameras on the front and two cameras on the back) and constructed using 6000 series aluminium.
In January 2019, Xiaomi officially announced Redmi to be a separate sub-brand, distinct from Xiaomi.
On 10 January 2019, [[Redmi unveiled the Redmi Note 7 and Redmi Note 7 Pro. The Redmi Note 7 and[Redmi Note 7 Pro are the first phones in the Redmi series to feature a 48-megapixel rear camera. The Redmi Note 7 has a Samsung GM1 image sensor, and the Redmi Note 7 Pro has a Sony IMX586 48MP image sensor. The Redmi Note 7 is powered by the Qualcomm Snapdragon 660 Octa-Core Processor clocked at 2.2 GHz, while the Redmi Note 7 Pro has an 11nm Qualcomm Snapdragon 675 Octa-Core Processor clocked at 2.0 GHz. The Redmi Note 7 is available with 3GB RAM with 32GB storage, 4GB RAM with 64GB storage and 6GB RAM with 64GB storage. It has a 4,000mAh battery with QuickCharge 4.0. The [[Redmi Note 7 series of smartphones is one of the best selling phone by Redmi. Over 20 million devices were sold in 7 months from introduction of phone.
The Redmi K20 and Redmi K20 Pro (also marketed as the Mi 9T) are Redmi's first foray into the flagship market. The phone was launched along with the [[Redmi 7A in China on May 28. The K20 Pro is powered by the flagship Snapdragon 855 processor while the K20 is powered by the newly released Snapdragon 730 and [[Redmi 7A is low range phone with Snapdragon 439. Redmi Note 8 and Redmi Note 8 Pro were launched in August 29. Redmi 8 and Redmi 8A were announced subsequently in October 2019.
After emerging as a sub-brand of Xiaomi, Redmi employed the same Smartphone & AIoT dual core strategy as Xiaomi, and branched out to different product categories such as smart TVs, notebook PCs. Xiaomi also forayed into home appliances such as washing machine and lifestyle products such as luggage.
On January 7, Redmi unveiled the Redmi K30 5G, it being Redmi's first 5G handset available in the market. The K30 is powered by the flagship Snapdragon 765G, an Octa-Core Processor clocked at 2.4GHz. The K30 features a LCD display punchhole camera cutout with 120Hz refresh rate.
In March, Redmi unveiled the Redmi Note 9 Pro and Redmi Note 9 Pro Max in India. Both handset models is powered by the Snapdragon 720G, an Octa-core Processor clocked at 2.2GHz. The Redmi Note 9 Pro features a 48MP quad camera rear setup and 18W fast charge, while the Redmi Note 9 Pro Max features a 64MP quad camera rear setup and 33W fast charge. In the same month, Redmi introduced the Redmi Note 9S to the global market, rebranded from the Indian Redmi Note 9 Pro, both featuring identical design and specifications. Redmi introduced the Indian Redmi Note 9 Pro Max rebranded as the Redmi Note 9 Pro to the global market in May, both featuring identical design and specifications.
On March 24, Redmi unveiled the Redmi K30 Pro. The Redmi K30 Pro has a Sony IMX686 64MP sensor. The K30 Pro is powered by the flagship Snapdragon 865, an Octa-Core Processor clocked at 2.84 GHz. The Redmi K30 Pro is available with 6GB LPDDR4X RAM with 128GB UFS 3.0 storage, 8GB LPDDR5 RAM with 128GB UFS 3.1 storage and 8GB LPDDR5 RAM with 256GB UFS 3.1 storage.
Redmi introduced a massive 98" Redmi TV MAX at a price of RMB 19,999 which undercuts the massive screen LCD TV market.
On May 26, Redmi unveiled the Redmi 10X Series, featuring the Redmi 10X Pro 5G, Redmi 10X 5G and Redmi 10X 4G. Both the Redmi 10X Pro 5G and Redmi 10X 5G features the MediaTek Dimensity 820, a 7nm Octa-core Processor clocked at 2.6GHz. Redmi 10X 4G features the MediaTek Helio G85, clocked at 2.4GHz. Along with the introduction of the Redmi 10X Series, Redmi also introduced the Redmi TV X-series, offering big-screen TV at excellent value. Redmi also unveiled a range of notebook PCs featuring AMD Ryzen on the same day.