Allview E4 vs vivo X21i

Compare recorded specifications, size and practical differences.

Allview E4

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vivo X21i

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Key differences

Calculated from recorded specifications using minimum difference thresholds. These are differences, not an overall ranking. For three phones, numeric highlights compare the two extremes.

Display technologyOLED versus LCDE4: LCD · X21i: OLED
WeightE4: 29 g lighterE4: 130 g · X21i: 159 g
WidthE4: 4.8 mm narrowerE4: 70.2 mm · X21i: 75 mm
Screen diagonalE4: 0.78 in smaller diagonalE4: 5.5 in · X21i: 6.28 in
ChipsetMediatek MT6753 (28 nm) / Mediatek MT6771 Helio P60 (12 nm)E4: Mediatek MT6753 (28 nm) · X21i: Mediatek MT6771 Helio P60 (12 nm)
Rear camera layoutSingle / DualE4: Single · X21i: Dual

Physical size

Relative size, not calibrated actual size. Front and side outlines share one scale and a bottom baseline. Generic outlines use recorded body dimensions, excluding camera bumps.

Front

Side

1. E4
Height
140.7 mm
Width
70.2 mm
Depth
8.6 mm+1.6 mm versus X21i

Weight
130 g
2. X21i
Height
154.4 mm+13.7 mm versus E4
Width
75 mm+4.8 mm versus E4
Depth
7 mm

Weight
159 g

Weight

Bars start at zero and share a scale within this chart.

1. E4130 g
2. X21i159 g

+29 g versus E4

Screen size

Approximate rectangular screens calculated from recorded diagonal and aspect ratio at one relative scale. Rounded corners and cutouts are not subtracted. These are not phone outlines or calibrated actual sizes.

At least two phones need compatible screen dimensions for a drawing.

1. E4 Screen geometry unavailable or conflicting
2. X21i 6.28 in · 19:9 About 98.4 cm² rectangular area

Memory variants

Each row compares the same storage capacity. Cells show recorded RAM alternatives, not combined maxima. Not recorded does not mean unavailable in every market.

Recorded RAM by storage capacity and phone
Storage	E4	X21i
16 GB	2 GB RAM	Unknown

X21i: Original memory entry

128 GB · 4 GB RAM 64 GB · 6 GB RAM

Practical features

Explicit Yes and No values are shown directly. Qualified or regional records retain their details. Unknown means the record is missing.

1. E4

NFC: See details Super AMOLED
Headphone jack: Yes
Memory card support: See details microSD · up to 32 GB (dedicated slot)

2. X21i

NFC: Unknown
Headphone jack: Yes
Memory card support: See details microSD · up to 256 GB (uses SIM 2 slot)

Battery capacity

Capacity is not battery life. No endurance test is implied.

Recorded capacity

Bars start at zero and share a scale within this chart.

1. E42100 mAh
2. X21i3425 mAh

+1325 mAh versus E4

Specifications

Open a section for more detail. On narrow screens, swipe sideways or use Left/Right arrow keys while the table is focused. Unknown means missing data, not No. Recorded zero values are shown as recorded.

1. E42. X21i

Everyday essentials

Everyday essentials
Specification	E4	X21i
Dimensions (HxWxD)	140.7 Х 70.2 Х 8.6 mm	154.4 Х 75 Х 7 mm
Weight	130 g	159 g
Technology	IPS LCD	Super AMOLED
Screen size	5.5" inch	6.28" inch
Screen resolution	720 x 1280 px	1080 x 2280 px
Internal memoryRecorded storage / RAM variants. Entries are alternatives, not a combined maximum. Ambiguous formats stay as recorded.	16 GB 2 GB RAM	128 GB 4 GB RAM 64 GB 6 GB RAM
Memory card support	microSD up to 32 GB (dedicated slot)	microSD up to 256 GB (uses SIM 2 slot)
BatteryCapacity is not battery life. No endurance test is implied.	2100 mAh Removable Li-Po	3425 mAh Non-removable Li-Ion
Operating system OS	Android 5.1 (Lollipop)	Android 8.1 (Oreo); Funtouch 4
Chipset	Mediatek MT6753 (28 nm)	Mediatek MT6771 Helio P60 (12 nm)
NFC	Super AMOLED	Unknown
Headphone jack	Yes	Yes

Display

Display
Specification	E4	X21i
Touchscreen	capacitive touchscreen	capacitive touchscreen
Display colors	Super AMOLED	16M
Screen area	68.9 cm2	98.4 cm2
Screen format	16:9 (height:width)	19:9 (height:width)
Screen to body ratio	143.5 Х 69.8 Х 8 mm	85.0%
PPI /points per inch/	294 PPI	402 PPI

Camera and Video

Camera and Video
Specification	E4	X21i
Rear camera, main	13 MP Single	12 MP Dual
Camera specs	13 MP AF	12 MP f/1.8 1/2.55'' 1.4µm dual pixel PDAF -5 MP f/2.0 depth sensor
Functions	Dual-LED flash	LED flash HDR panorama
Video	1080p@30fps	1080p@30fps
Front camera, selfie	5 MP Single	24 MP Single
Specifications	5 MP	24 MP

Performance

Performance
Specification	E4	X21i
Processor CPU	Octa-core 1.3 GHz Cortex-A53	Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53)
Graphics processor GPU	Mali-T720MP3	Mali-G72 MP3
Antutu 7 scoreLegacy recorded score. Test conditions are unspecified; no new testing is implied.	23156	130256
GeekBench 4 Single CoreLegacy recorded score. Test conditions are unspecified; no new testing is implied.	Unknown	1497
GeekBench 4 Multi-CoreLegacy recorded score. Test conditions are unspecified; no new testing is implied.	Unknown	5759

General specs

General specs
Specification	E4	X21i
Release date	2015 September	2018 May
Colors	Black White	Black Aurora White Ruby Red Night Purple
Historical recorded priceLegacy catalogue value; date unknown. Not a current offer.	240 EUR	430 EUR
Battery life	Stand by time- Up to 210 h Talking time- Up to 9 h 30 min	Unknown

Communication and Connectivity

Communication and Connectivity
Specification	E4	X21i
SIM card	Single SIM (Micro-SIM)Dual SIM (Micro-SIM dual stand-by)	Hybrid Dual SIM (Nano-SIM dual stand-by)
Network	Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2-3G - HSDPA 900 / 2100-4G - LTE band 2(1900) 3(1800) 20(800) 38(2600)	Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA 800 & TD-SCDMA -3G - HSDPA 850 / 900 / 2100 -4G - LTE band 1(2100) 3(1800) 4(1700/2100) 5(850) 8(900) 38(2600) 39(1900) 40(2300) 41(2500)
Speed	HSPA 21.1/5.76 Mbps LTE Cat4 150/50 Mbps	HSPA LTE
GPRS	Class 12	Yes
Edge	Class 10	Yes
Wi-Fi	Wi-Fi 802.11 b/g/n	Wi-Fi 802.11 a/b/g/n/ac dual-band WiFi Direct hotspot
GPS	Yes with A-GPS	Yes with A-GPS GLONASS
USB	microUSB 2.0	microUSB 2.0 USB On-The-Go
Bluetooth	4.0 A2DP EDR	5.0 A2DP LE
Harmful irradiation	SAR EU - 1.23 W/kg (head)	Unknown

Music and Audio

Music and Audio
Specification	E4	X21i
Radio	FM radio	FM radio
Others	Unknown	32-bit/192kHz audio -Active noise cancellation with dedicated mic

Other features

Other features
Specification	E4	X21i
Dop	Sensors Accelerometer proximity compass	Sensors Fingerprint (rear-mounted) accelerometer proximity compass - Fast battery charging