Our Opinion

The OnePlus 6 (8GB RAM, 128GB) is a significantly better phone than the Vivo X21, and is also significantly better value for money. What should you buy? Go for the OnePlus 6 (8GB RAM, 128GB)!

OnePlus 6 (8GB RAM, 128GB)  Vivo X21 
OnePlus 6 Vivo X21
Buy Now Buy Buy
Excellence Score
83.8
75.5
Value for Money Score
83.5
70.8
Price ₹ 39,999 onwards ₹ 34,800 onwards
Launch Date (India) May, 2018 May, 2018
Expected Launch Date N/A N/A
Smartphone OS Android 8.1 Oreo, Upgradeable to P Android 8.1 Oreo
Touchscreen Yes (Capacitive) Yes (Capacitive)
Screen Size 6.28 inches 6.28 inches
Screen Resolution 1080x2280 pixels (~ 402 pixels per inch) 1080x2280 pixels (~ 402 pixels per inch)
Scratch Resistant Display Yes, Corning Gorilla Glass 5 Yes, Corning Gorilla Glass 3
Display Features Optic AMOLED, 2.5D Curved Glass, Reading Mode, Night Mode, Lift Up Display Super AMOLED, FullView Display, 2.5D Curved Glass, Eye Protection Mode
Full Physical QWERTY Keypad
Processor 2.8 GHz 2.2 GHz
Processor Type Octa Core Octa Core
Processor Name Qualcomm Snapdragon 845 Qualcomm Snapdragon 660
GPU Adreno 630 Adreno 512
RAM 8 GB 6 GB
3G Yes Yes
4G Yes Yes
VoLTE Yes Yes
WiFi Yes Yes
GPS Yes Yes
Bluetooth Yes Yes
USB Yes Yes
Camera 16.0 MP 12.0 MP
Camera Auto-Focus Yes Yes
Camera Flash Yes Yes
HD Video Recording Yes (4K) Yes (Full HD)
Other Camera Features Dual Camera (16MP + 20MP), 16MP: F/1.7 Aperture; Sony IMX 519 Sensor; 1.22 µm Pixel Size; 1/2.6" Sensor Size; Optical Image Stabilisation (OIS); Electronic Image Stabilisation (EIS), 20MP: F/1.7 Aperture; Sony IMX 376K Sensor; 1.0µm Pixel Size; 1/2.8" Sensor Size; Phase Detection Autofocus (PDAF), Super Slow Motion (1080p @ 240fps; 720p @ 480fps), Time-Lapse, Portrait Mode, Pro Mode, Panorama, HDR, HQ, Dynamic Denoise, Clear Image, RAW Image Dual Camera (12MP + 5MP), 12MP: F/1.8 Aperture; 1/2.5" Sensor Size; 1.4µm Pixel Size, 5MP: F/2.4 Aperture, Dual Pixel Sensors, Phase Detection Autofocus (PDAF), Geo-tagging, Touch focus, Face detection, HDR, Panorama
Secondary Camera 16.0 MP 12.0 MP
Secondary Camera Features Screen Flash, F/2.0 Aperture, Sony IMX371 Sensor, 1.0µm Pixel Size, Electronic Image Stabilisation (EIS), Full HD Video Rec., Time-Lapse, Portrait Mode, HDR, Smile Capture, Face Beauty F/2.0 Aperture, Screen flash
Internal Memory 128 GB 128 GB
Expandable Memory Slot up to 256 GB
Contacts Storage Unlimited Unlimited
SMS Storage Unlimited Unlimited
Music Player Yes Yes
FM Radio
Dual SIM GSM+GSM GSM+GSM (Hybrid SIM slot)
Thickness 7.75 mm 7.37 mm
Weight 177 gm 156 gm
Audio Output 3.5mm jack 3.5mm jack
Water Resistant Yes
Battery Capacity 3300 mAh 3200 mAh
Battery Standby N/A N/A
Battery Standby (3G) N/A N/A
Battery Talktime N/A N/A
Battery Talktime (3G) N/A N/A
Fast Charging Yes, Dash Charge Yes
Other Battery Parameters N/A N/A
Fingerprint sensor Yes Yes
Other Features Face Unlock; Gestures and on-screen navigation support; Alert Slider; DLNA; NFC; USB Type-C; MIMO; Dual-band WiFi; WiFi Direct; Noise Filtration; Dirac HD Sound; Dirac Power Sound In-display Fingerprint Sensor; Face Unlock; WiFi Dual-band; WiFi Direct; USB On-The-Go; Noise Filtration
2-minute Review [Positives]
  • The best looking OnePlus phone to date - has a polished refined design, with a glass rear panel, and three distinct (and beautiful) color options (plus the Marvel Avengers edition)
  • Excellent build quality
  • The phone is comfortable to hold, thanks to the curved glass rear
  • Face unlock works great in most conditions, and unlocks the phone in a fraction of a second (except in low light or under very bright sunlight)
  • There is also of course the fingerprint sensor at the back, if you wish to use that instead, and it works great too
  • OnePlus's excellent alert slider is there too (it has now moved to the right side of the phone) - and is now more simplified toggling between 3 simple states - ring, vibrate and silent, with a pop-up that tells you instantly which mode you are switching to every time
  • Excellent display - catches on to the modern 'notch' trend, with a tall screen ratio - the AMOLED screen is vivid, with punchy colours and great viewing angles - videos looks great, and you can also set your own custom colour temperature if you prefer
  • OxygenOS continues to be a huge differentiator for OnePlus - it strikes a great balance between keeping the base UI identical to stock Android but still adding a number of useful additions - like shortcuts, a dark theme, a scrolling screenshot capture tool, and controls for giving the on-screen buttons additional functions, night and reading modes, a choice of system fonts, and configurable colours for the notification LED - all in all, its a great software experience, that ticks the right boxes
  • Another interesting add-on is an optional gesture scheme that lets you get rid of the Android navigation buttons altogether, and gives you a full gesture based navigation scheme like the iPhone X - thus giving you even more screen space to play with - the gestures do take some time to get a hang of, but once you do, they will become second nature
  • There's also a Gaming Mode that not only suppresses non-essential notifications, but can also limit background apps' Internet usage, which can make a difference in online games - you can even route calls directly to the loudspeaker so you don't have to stop playing
  • Top-notch, breathtaking performance, backed by the latest flagship processor from Snapdragon, the Snapdragon 845 - the SoC has eight Kryo 385 cores, integrated Adreno 630 graphics, improved security and image processing subsystems, a faster LTE modem, and even hardware dedicated to AI processing - all of this means the performance is top-bracket, matching (or beating) the Galaxy S9/Plus in benchmark scores
  • Good set of dual rear cameras, significantly improved from the OnePlus 5T - especially in terms of portrait mode photos, low light performance, and video recording (including a new super-slow motion mode)
  • The rear cameras now also come with OIS
  • Decent (though not great) front camera, pretty similar to the OnePlus 5T - a software bokeh mode for the front camera is promised for a future OxygenOS update
  • Decent loudspeaker (pretty loud) - although it tends to get blocked when you hold the phone in landscape mode
  • Good (but not exceptional) battery life - will comfortably last the day with moderate to heavy use
  • Fast charging support - the Dash Charger takes the phone up from zero to just over 50 percent in half an hour, and gives you a full charge in around an hour and a half
  • On the whole, the OnePlus 6 is good-looking, well crafted, extremely powerful - it is also a solid upgrade to the OnePlus 5T in almost all the departments such as display, performance, design and camera - and ultimately the OnePlus 6’s bang for buck is still about the best you can get in the smartphone world
  • Refined, understated design - the phone is sleek and features an all-black aluminum frame and a glass back with tapered edges, which make it very comfortable to hold
  • Surprisingly easy to handle, especially considering the 6.28-inch screen - the tall 19:9 aspect ratio helps a lot, and it also gives the front of the phone that modern bezel-less look everyone craves these days
  • Fans of minimalism will enjoy the Vivo X21 too - with the fingerprint sensor hidden under the screen, the back of the phone is very clean
  • The Vivo X21’s display is otherwise beautiful too with the characteristic vibrant color palette and inky blacks of an OLED display - it has excellent brightness levels, and outdoor visibility too
  • The Vivo X21 also features an always-on display that looks pretty similar to Samsung’s implementation, with a clock and other notifications on screen
  • The key USP of the phone, however, is the world's first under-display fingerprint sensor - the sensor works well most of the time, although it can be buggy now and then
  • In case you are not into that, you can also opt for the infrared-based facial recognition, which is fast and accurate, and pleasantly works in all kinds of lighting conditions
  • Good speed/performance backed by the solid Snapdragon 660 processor and an ample 6GB of RAM - mostly, in actual use, you will be hard pressed to see any differences in performance even compared to the top-end Android flagships like the Pixel 2 or the Galaxy S9
  • Decent dual camera setup at the back - does well especially in good lighting conditions, and with bokeh effects - it's not quite to the level of the Pixel 2 or the Galaxy S9 - but for its price bracket, it does a decent job
  • The front 12MP camera is decent too, and can also do (software based) bokeh images
  • Good audio quality via headphones
  • The single bottom-firing speaker also gets pretty loud
  • Good battery life - will last the day with medium to heavy use
  • Fast charging support
2-minute Review [Negatives]
  • A little slippery because of the glass
  • Will also tend to pick up smudges very quickly
  • It's not the easiest to reach all corners of the newly enlarged screen - people who prefer more compact phones might have preferred a smaller-screen option for themselves
  • At 177g, the phone is a bit on the the heavier side too
  • While OnePlus does claim that the phone has water-resistance, it's not IP rating certified, which likely means that the protection is quite basic
  • The rear and front cameras are good, but not really up to the high benchmarks set by the likes of the iPhone X, the Galaxy S9, or the Pixel 2 - this continues to be the only one significant area, where you will be making a compromise over the best flagship smartphones, when you buy a OnePlus device (of course admittedly for a much lower price)
  • No water resistance - a feature thats now present in most phones in this price bracket
  • Uses the old microUSB standard, instead of the modern USB-C port
  • One area where the X21 loses out is the refinement of the UI - the OS which is basically a copy of the iOS, can often be un-intuitive, and sometimes buggy - the devil is in the details - and details are not very well done here
  • On the whole, the Vivo X21 is a good all-round phone, and has an innovative under-glass fingerprint sensor, but it's let down to some extent by its UI - everything considered, unless you are into the cutting edge fingerprint sensor tech, you are likely to find better overall value devices in this price segment, like the OnePlus 6, or the Honor 10
Expert Reviews
  1. OnePlus 6 is a beautiful phone that feels fast and that you will simply enjoy using day in and day out. And the reasonable price? Well, that’s the icing on the cake!
    phonearena.com in-depth Read Review »
  2. The OnePlus 6 has hit most of the sweet spots: This is a uniquely gorgeous device with intuitive features, as well as solid battery life and a great camera
    engadget.com in-depth Read Review »
  3. There’s certainly a lot to like here — attractive design, great display, reliable battery life, fast performance, and great software — and there aren’t any silly, trend-chasing things
    theverge.com in-depth Read Review »
  4. This is a phone you can show off quite proudly
    gadgets.ndtv.com in-depth Read Review »
  5. A solid upgrade to the OnePlus 5T in almost all the departments such as display, performance, design and camera
    fonearena.com in-depth Read Review »
  6. gsmarena.com in-depth Read Review »
  7. The OnePlus 6 is built for speed from the ground up
    digit.in in-depth Read Review »
  8. Here’s a flagship device that gets it right on practically every count
    bgr.in in-depth Read Review »
  9. cnet.com in-depth Read Review »
  10. wired.com in-depth Read Review »
  11. techradar.com in-depth Read Review »
  12. mashable.com in-depth Read Review »
  13. androidauthority.com in-depth Read Review »
  14. digitaltrends.com in-depth Read Review »
  15. trustedreviews.com in-depth Read Review »
  16. indianexpress.com in-depth Read Review »
  17. OnePlus’ finest is still punching above its weight
    livemint.com in-depth Read Review »
  18. economictimes.indiatimes.com in-depth Read Review »
  19. hindustantimes.com in-depth Read Review »
  20. alphr.com in-depth Read Review »
  21. news18.com in-depth Read Review »
  22. expertreviews.co.uk in-depth Read Review »
  23. tomsguide.com in-depth Read Review »
  24. androidcentral.com in-depth Read Review »
  25. thequint.com in-depth Read Review »
  26. stuff.tv in-depth Read Review »
  27. zdnet.com in-depth Read Review »
  28. slashgear.com in-depth Read Review »
  29. firstpost.com in-depth Read Review »
  30. techadvisor.co.uk in-depth Read Review »
  31. pocket-lint.com in-depth Read Review »
  32. beebom.com in-depth Read Review »
  33. arstechnica.com in-depth Read Review »
  34. t3.com in-depth Read Review »
  35. indiatoday.in in-depth Read Review »
  36. androidpolice.com in-depth Read Review »
  37. gizmodo.com in-depth Read Review »
  38. gadgetsnow.com in-depth Read Review »
  39. recombu.com in-depth Read Review »
  40. pcmag.com in-depth Read Review »
  41. deccanchronicle.com in-depth Read Review »
  42. ibtimes.co.in hands-on Read Review »
  43. thenextweb.com hands-on Read Review »
  44. wired.co.uk hands-on Read Review »
  1. The under-display fingerprint scanner is a welcome change in the tech industry
    fonearena.com in-depth Read Review »
  2. Vivo X21 is an all-rounder with good performance, decent camera performance and a snazzy new in-display fingerprint scanning technology
    bgr.in in-depth Read Review »
  3. The Vivo X21 is a fun device that gets a lot of things right
    androidauthority.com in-depth Read Review »
  4. gadgets.ndtv.com in-depth Read Review »
  5. forbes.com in-depth Read Review »
  6. mashable.com in-depth Read Review »
  7. economictimes.indiatimes.com in-depth Read Review »
  8. A device for tech enthusiasts
    beebom.com in-depth Read Review »
  9. The Vivo X21 is a device straight out of the future
    indiatoday.in in-depth Read Review »
  10. gadgetsnow.com in-depth Read Review »
  11. deccanchronicle.com in-depth Read Review »
  12. techradar.com hands-on Read Review »
User Reviews
  1. Amazon4.3 2,488+ reviews »
  1. Flipkart4.4 64+ reviews »
Official Website Official Website » Official Website »
Unofficial specs? N/A N/A
Comparison Videos
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OnePlus 6 vs Vivo X21 | Which Is the Better Phone Overall?

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Vivo X21 vs OnePlus 6 Camera Comparison- Which is better?

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OnePlus 6 Review: Right On the Money!

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Vivo X21 Review | Is the In-Display Fingerprint Sensor a Game Changer?

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