Our Opinion

The Xiaomi POCO F1 (6GB RAM, 64GB) is a significantly better phone than the Vivo S1 (4GB RAM, 128GB), and is also slightly better value for money. What should you buy? Go for the Xiaomi POCO F1 (6GB RAM, 64GB)!

Vivo S1 (4GB RAM, 128GB)  Xiaomi POCO F1 (6GB RAM, 64GB) 
Vivo S1 Xiaomi POCO F1
Buy Now Buy Buy
Excellence Score
30.4
37.2
Value for Money Score
65.8
66.8
Price ₹ 14,990 onwards ₹ 18,549 onwards
Launch Date (India) Aug, 2019 Aug, 2018
Expected Launch Date N/A N/A
Smartphone OS Android 9.0 PieLow likelihood of getting updated to next Android version Android 8.1 Oreo, Upgradeable to Android 10Low likelihood of getting updated to next Android version
Touchscreen Yes (Capacitive) Yes (Capacitive)
Screen Size 6.38 inches 6.18 inches
Screen Resolution 1080x2340 pixels (~ 404 pixels per inch) 1080x2246 pixels (~ 403 pixels per inch)
Tall Aspect Ratio / Minimal Bezels Yes Yes
Scratch Resistant Display Yes Yes, Corning Gorilla Glass 3
Display Type AMOLED IPS LCD
Screen Refresh Rate 60 HzStandard 60 HzStandard
Display Features Super AMOLED IPS LCD, FullView Display, 2.5D Curved Glass, Sunlight display, Night display, Reading mode, Color temperature adjustment
Full Physical QWERTY Keypad
Processor 2 GHz 2.8 GHz
Processor Type Octa Core Octa Core
Processor Name MediaTek Helio P65Ranked #42 in Mobile Processor Benchmarks Qualcomm Snapdragon 845 with LiquidCool TechnologyRanked #15 in Mobile Processor Benchmarks
GPU Mali-G52 Adreno 630
RAM 4 GB 6 GB
3G Yes Yes
4G Yes Yes
5G
VoLTE Yes Yes
WiFi Yes Yes
VoWiFi/WiFi-Calling Yes
GPS Yes Yes
Bluetooth Yes Yes
Connecting Port microUSB USB-C
Primary Camera 16MP + 8MP + 2MP 12MP + 5MP
Camera Auto-Focus Yes Yes
Camera Flash Yes Yes
HD Video Recording Yes (4K) Yes (4K)
Other Camera Features 16MP: F/1.78 Aperture; 1/2.8" Sensor Size; 1.12um Pixel Size; PDAF; Sony IMX499 Sensor, 8MP: F/2.2 Aperture; 13mm Focal Length (Ultrawide); 120° Wide-angle lens, 2MP: F/2.4 Aperture; Depth Sensor, HDR, Panorama, Video: [email protected]; [email protected], Live Photos, AI Super Wide-Angle, Portrait Mode, AI Portrait Framing, Doc Mode, Professional, AR Stickers, AI Face Beauty, Video, Video Face Beauty, Time-Lapse, Slo-Mo 12MP: F/1.9 Aperture; Dual Pixel Autofocus; 1.4um Pixel Size; Sony IMX363 sensor, 5MP: 1.12um Pixel Size; F/2.0 Aperture, Portrait mode, EIS, Low light enhancement, HDR, Panorama, Face recognition, AI Beautify, AI dirt detection, Slow motion video
Secondary Camera 32MP 20.0MP
Secondary Camera Features F/2.0 Aperture, HDR, Panorama, Live Photos, Gender detection, Face Beauty, Portrait, AR Stickers, Video Face Beauty, AI Selfie Lighting, AI Face Beauty LED flash, AI portrait mode, AI detection of 10 different scenes, Selfie timer, Face recognition
Internal Memory 128 GB 64 GB
Expandable Memory Slot Yes, up to 256 GB Yes, up to 256 GB
Contacts Storage Unlimited Unlimited
SMS Storage Unlimited Unlimited
Music Player Yes Yes
FM Radio Yes Yes
Dual SIM GSM+GSM GSM+GSM (Hybrid SIM slot)
Thickness 8.13 mmMedium 8.8 mmMedium
Weight 179 gmMedium 182 gmMedium
Width 75.2 mmOk for one-handed use 75.3 mmOk for one-handed use
Audio Output 3.5mm jack 3.5mm jack
Water Resistant Yes, Splash Resistant
Battery Capacity 4500 mAh 4000 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 Support Yes, 18W Fast Charging Yes, 18W Quick Charge 3.0
Included Fast Charger Yes, 18.0W Fast Charger Yes, 18.0W Fast Charger
Other Battery Parameters N/A N/A
Fingerprint sensor Yes Yes
Other Features In-display Fingerprint Sensor; Noise Filtration MIMO; WiFi Display; Noise Filtration; Dirac HD; Dual Smart PA
2-minute Review [Positives]
  • Stunning, beautiful design, that's a treat to the eyes - Vivo S1 is easily among the most well-designed smartphones to launch this year
  • There is a mesmerising dual tone finish on the metal frame, and a unique 'diamond lattice' design back, that reflects colors in the most interesting ways - this is the kind of smartphone that will definitely get you a lot of Wows from everyone around
  • It not only looks great but also feels great to hold and use thanks to the 2.5D design
  • Fast in-display fingerprint sensor
  • Dedicated Google Assistant button
  • Very good 6.38-inch AMOLED display - you will get deep blacks and punchy colors
  • Funtouch OS UI looks very similar to iOS, and is pretty feature packed, including a good gesture navigation system, and an 'Ultra Game' mode
  • Daily performance is smooth all-round with a Helio P65 processor (similar to the Helio P70, and Snapdragon 660), and most games run well too
  • Decent set of triple rear cameras - 16MP primary + 8MP ultra-wide + 2MP depth
  • The primary camera captures images with fairly good details
  • The depth camera helps with some decent portraits
  • The 32MP selfie camera is decent too, and does especially well with details (though the image softening algorithm is a bit too aggressive)
  • Outstanding battery life with a large 4500mAh battery paired with a low-power MediaTek Helio P65 SoC - you will comfortably clock 2 days of use
  • Bundled 18W fast charger
  • Rugged design, with top-notch fit and finish - one of the most solidly built phones in recent times - comes with a polycarbonate chassis instead of a glass finish more commonly seen in this price bracket these days - what that means is that it looks less premium, but at the same time will be much more durable over the long term
  • Excellent IR based facial recognition - which works in the dark too (like the iPhone X) - the unlock time is just 0.1ms - in fact it works so well, that you will likely end up not using the fingerprint sensor at all (which itself, works very well too, in case you do want to use it)
  • Very good 6.18-inch FHD+ 19:9 display - excellent brightness levels ensure that there are zero issues with reading the contents on the screen under harsh sunlight as well
  • MIUI has always been one of the most refined Android UIs out there, and continues to get even better - it offers a good combination of aesthetics, useful added functionality, lots of customizability, and optimization - and now it also has an app drawer like stock Android (there are some preinstalled apps like UC Browser, Amazon, and Facebook, to Microsoft apps like Word and Excel, but all of these apps can be uninstalled if you don't need them)
  • And as is the case with all phones running Android 8.1 Oreo out of the box, the POCO F1 offers Treble, and POCO says it will honor the warranty for those users that tinker with custom ROMs - in fact POCO is actively encouraging the modding community to make custom ROMs for the phone - which means that (unofficial) Android updates will continue to be available for the phone for a long, long time to come
  • Top-end performance, backed by the scorching Snapdragon 845 - the speed here is right up there with the likes of the OnePlus 6, and other flagships - it delivers blistering performance day in, day out - coupled with a well optimized MIUI, you are going to get butter smooth performance all through
  • To further differentiate the F1, POCO has incorporating liquid cooling in the device, which is designed to boost sustained peak performance times - there's a vapor chamber next to the chipset that siphons heat and dissipates it over a wider area, preventing the phone from overheating during prolonged gaming sessions - what that means is you could play graphics-heavy games for hours on end, and the phone doesn't warm up in any significant amount
  • Good dual rear camera setup, with plenty of AI chops - photos taken in daylight come out with plenty of detail and high dynamic range - bokeh shots come out well too - and low-light shots are decent too - overall the camera is pretty close to that on the OnePlus 6 in overall quality (and the OnePlus 6 costs much more!)
  • Good front camera too - delivers some great vanity shots, and is surprisingly good in portrait mode, getting most of the edges right, and blurring out background beautifully
  • Video recording quality is pretty good too, with quality 4K and 1080p shots
  • Good call quality and dual VoLTE support
  • The speaker is one of the best you'll find at this price point, and the F1 gets loud — playing games and watching videos is a delight on this phone - a major reason for that has to do with the fact that the phone has Dirac HD Sound — a mainstay on Xiaomi phones in the past - the earpiece also doubles up as a secondary speaker
  • The F1 is in a class of its own when it comes to battery life, outclassing even the battery powerhouse Redmi Note 5 - thanks to the combination of the 10nm Snapdragon 845, the 4000mah battery, and well-optimized MIUI - you'll easily get two days' worth of use out of the F1
  • The F1 supports Quick Charge 3.0, and Poco is bundling an 18W charger in the box - it takes just under two hours to charge the device fully, and you'll be able to go from flat to a 50% charge in just under 30 minutes
  • Combine the excellent battery life + the excellent fast charging, there isn't a single flagship that comes close to the F1 in terms of battery life
  • On the whole, the Poco F1 gives incredible performance at an unbeatable price - nothing comes close - and some great devices like ASUS' ZenFone 5Z, and the OnePlus 6 start to look expensive in comparison (which is saying something) - the F1 is a durable all-rounder flagship that will serve you well in all areas - and it comes right now with an incredible value-for-money proposition
2-minute Review [Negatives]
  • It's on the cluttered side though, and does have some bloatware - so the experience is not as clean and simple as stock Android
  • More complex games like PUBG though are not smooth at high graphics settings - and here the phone loses out to the best performing phones of this price bracket that pack the likes of Snapdragon 675, and Snapdragon 710
  • The ultra-wide camera provides for versatility in shot framing, but the quality is average - details are low, and the overall image is muted
  • Low light performance is average too
  • Overall, the cameras are decent for the price bracket, but not really comparable to the top camera phones of this price bracket, like Redmi Note 7 Pro, Realme 3 Pro, Realme X, and even the Vivo Z1 Pro
  • Uses the old microUSB port, instead of the modern USB-C port
  • On it's own the Vivo S1 is a pretty good device, but it faces some real tough competition at the moment - the camera and the performance are not the best for the price bracket, though if your main priorities are a best-in-class design, and excellent battery life, it could still make a lot of sense
  • The polycarbonate design means that it definitely doesn't look quite as premium as the OnePlus 6, or the Zenfone 5Z (although what it lacks in looks it makes up for in durability, so it depends on what you value)
  • The display has fairly significant bezels around it, compared to the tall displays on other flagship phones
  • Low light performance is one area where it's not quite as good as the OnePlus 6 camera, since it lacks OIS
  • Like other recent Xiaomi phones, the Poco F1 does not support HD streaming from Netflix and Amazon Prime (the content is streamed at max 540p), due to a certification issue, so you might want to keep that in mind if you plan to use these services on your phone
Expert Reviews
  1. For the asking price, you can get better-equipped smartphones
    gadgets.ndtv.com in-depth Read Review »
  2. If your priority is absolutely best in selfie experience then pick Vivo S1, else its rivals look better
    bgr.in in-depth Read Review »
  3. If you can make your peace with the camera performance and you are not into graphics-heavy games, Vivo S1 is not a bad deal
    indianexpress.com in-depth Read Review »
  4. A good device to consider in this price range
    themobileindian.com in-depth Read Review »
  5. An average midranger with more style and less substance
    in.mashable.com in-depth Read Review »
  6. It’s got the looks, but needs more
    techpp.com in-depth Read Review »
  7. At the price point, there are far more compelling options available
    timesnownews.com in-depth Read Review »
  8. A great midrange device
    deccanchronicle.com in-depth Read Review »
  9. It is a capable phone, and a looker...but there are better deals available
    indiatoday.in in-depth Read Review »
  10. A balanced midrange phone marred by Vivo’s unoptimised user interface
    business-standard.com in-depth Read Review »
  11. gsmarena.com hands-on Read Review »
  12. fonearena.com hands-on Read Review »
  13. ibtimes.co.in hands-on Read Review »
  1. A remarkably well-rounded budget smartphone
    phonearena.com in-depth Read Review »
  2. A Pocket-Friendly Flagship Slayer
    beebom.com in-depth Read Review »
  3. Xiaomi has hit the ball right out of the park
    gadgets.ndtv.com in-depth Read Review »
  4. Deal of the Century
    fonearena.com in-depth Read Review »
  5. At Rs 20,999, it can’t get any better
    digit.in in-depth Read Review »
  6. Incredible value for money
    bgr.in in-depth Read Review »
  7. A good phone, but an amazing deal
    androidauthority.com in-depth Read Review »
  8. At this price, Poco F1 is a steal
    indianexpress.com in-depth Read Review »
  9. Unmatched value for money
    androidcentral.com in-depth Read Review »
  10. The phone is so fiercely priced for a package this well rounded, that it is hard for us to not recommend it
    livemint.com in-depth Read Review »
  11. Xiaomi redefines flagship with this hard-to-beat smartphone
    business-standard.com in-depth Read Review »
  12. Simply the best value for money smartphone you can buy
    firstpost.com in-depth Read Review »
  13. gsmarena.com in-depth Read Review »
  14. forbes.com in-depth Read Review »
  15. economictimes.indiatimes.com in-depth Read Review »
  16. ibtimes.co.in in-depth Read Review »
  17. expertreviews.co.uk in-depth Read Review »
  18. slashgear.com in-depth Read Review »
  19. themobileindian.com in-depth Read Review »
  20. deccanchronicle.com in-depth Read Review »
  21. indiatoday.in in-depth Read Review »
  22. techadvisor.co.uk in-depth Read Review »
  23. techradar.com hands-on Read Review »
  24. trustedreviews.com hands-on Read Review »
  25. thenextweb.com hands-on Read Review »
User Reviews
  1. Flipkart4.5 776+ reviews »
  1. Flipkart4.5 30,036+ reviews »
Official Website Official Website » Official Website »
Unofficial specs? N/A N/A
Individual Review 2
  • Individual Review 2
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