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The Redmi 15 5G has the stronger display and larger listed battery on paper; the vivo Y21 5G lists faster wired charging. Both are specified with a 50MP main rear camera, but the available specifications do not establish which phone takes better photos or performs faster. There is no confirmed like-for-like price winner: prices depend on the exact RAM and storage, seller, and offer.
Redmi 15 5G vs vivo Y21 5G: specifications at a glance
| Specification | Xiaomi Redmi 15 5G | vivo Y21 5G |
|---|---|---|
| Display | 6.9-inch FHD+ LCD, 1080 × 2340, 144Hz, as listed by comparison sources | 6.74-inch LCD, 1600 × 720, 120Hz, according to vivo India |
| Processor | Qualcomm Snapdragon 6s Gen 3, as listed by comparison sources | MediaTek Dimensity 6300, according to vivo India and comparison sources |
| Battery and charging | 7,000mAh, 33W, as listed by comparison sources | 6,500mAh, 44W, according to vivo India |
| Rear cameras | 50MP main camera, as listed by comparison sources | 50MP main camera plus 0.08MP secondary camera, according to vivo India |
| Front camera | 8MP, as listed by comparison sources | 5MP, according to vivo India |
| RAM and storage | Listings report 6GB or 8GB RAM and 128GB or 256GB storage; confirm the specific SKU | vivo India lists 4GB, 6GB or 8GB RAM and 128GB storage |
| Software listed | Android 15 with HyperOS on 91mobiles | OriginOS 6 on vivo India; comparison sources label Android 16 |
These are published specifications, not results from a head-to-head test. Redmi display, processor, battery and camera details above are reported by 91mobiles and cross-check listings at Gadgets 360. vivo specifications are on the vivo India Y21 5G product page. Regional product names, software versions and specifications can vary or change with updates.
Which phone has the better display?
The Redmi 15 5G has the advantage on the published figures: its 6.9-inch screen is listed at 1080 × 2340 resolution and 144Hz, while vivo India specifies a 6.74-inch, 1600 × 720 LCD with a 120Hz refresh rate for the Y21 5G. That means the Redmi offers more reported pixels and a higher refresh-rate ceiling, as well as a slightly larger screen.
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Those numbers do not establish brightness, color accuracy, outdoor readability or how consistently either phone sustains its maximum refresh rate. If those qualities matter, look for a review of the exact Indian-market models rather than treating resolution and refresh rate as a complete picture of display quality.
#1 Best Overall
- USA MARKET ONLY WORK ON TMOBILE MINT TELLO OR ANY UNDER TMOBILE NETWORK PHONE NEEDS A SIM CARD ALREADY ACTIVATED ,OUTSIDE USA WORKS ANY GSM CARRIER SIM GSM FCC ID: 2AFZZRAD4G
- nano SIM 1 + Hybrid (nano SIM or microSD) Dual standby , n1/2/3/5/7/8/12/20/26/28/38/40/41/48/66/77/78 4G : B1/2/3/4/5/7/8/12/13/17/18/19/20/26/28/32/66 4G: LTE TDD: B38/40/41/42/48 3G: WCDMA: Band 2/4/5/8 2G: GSM: Quad Band.
- 6.77" AMOLED displayResolution: 2392 × 1080Refresh rate: Up to 120HzTouch sampling rate: 240HzBrightness: 3200 nits peak brightness, 800 nits (typ)Colour depth: 12 bitContrast ratio: 8,000,000:1DCI- P3 wide color gamutSunlight displayReading mode3840Hz PWM dimming｜16,000-level brightness adjustmentScreen-to-body ratio: 92%*Data obtained from Xiaomi Internal Labs. Actual results may vary.TÜV Rheinland Low Blue Light (Hardware Solution) Certified TÜV Rheinland Circadian Friendly Certified TÜV Rheinland Flicker Free Certified
- Snapdragon 6 Gen 3 Mobile Platform4nm manufacturing process technologyCPU: Octa-core processor, up to 2.4GHzGPU: Adreno
- Virtual proximity sensor | Ambient light sensor | Accelerometer | Electronic compass | IR blaster | Gyroscope / GPS: L1 | GLONASS: G1 | BDS: B1I | Galileo E1 / Wireless NetworksBluetooth 5.3Wi-Fi Protocol: 802.11a/b/g/n/ac Supports 2.4GHz Wi-Fi | 5GHz Wi-Fi Wi-Fi Direct / In-screen fingerprint sensorAI Face Unlock
Battery capacity or faster charging?
The Redmi is listed with a 7,000mAh battery and 33W charging; vivo India lists 6,500mAh and 44W for the Y21 5G. The Redmi therefore has greater rated capacity, while the vivo has the higher listed charging wattage.
Capacity and charging power alone cannot predict how long a phone lasts or how quickly it charges from empty. Those outcomes also depend on usage, software, charging conditions and other factors; the cited specifications do not provide a directly comparable battery-life or charging-time test.
Rank #2
- USA MARKET ONLY WORK ON TMOBILE MINT TELLO OR ANY UNDER TMOBILE NETWORK PHONE NEEDS A SIM CARD ALREADY ACTIVATED ,OUTSIDE USA WORKS ANY GSM CARRIER SIM GSM FCC ID: 2AFZZRA29G
- Dual SIM (nano SIM + nano SIM or nano SIM + eSIM) NO MICRO SD SLOT. 5G: n1/2/3/5/7/8/12/20/26/28/38/40/41/48/66/77/78 - 4G: LTE FDD: 1/B2/B3/B4/B5/B7/B8/B12/B13/B17/B18/B19/B20/B26/B28/B32/B66 4G: LTE TDD: B38/B40/B41/B42/B48 - 3G: WCDMA: B1/B2/B4/B5/B6/B8/B19 - 2G: GSM: B2/B3/B5/B8
- 6.83" AMOLED displayResolution: 1.5K (2772 x 1280)Refresh rate: Up to 120HzTouch sampling rate: Up to 480HzInstantaneous touch sampling rate: 2560Hz*Activated in Game Turbo modeBrightness: 3200 nits peak brightnessBrightness: HBM 1800 nitsColor depth: 12bitContrast ratio: 8000000:1DCI- P3 wide color gamut447PPICorning Gorilla Glass Victus 2Sunlight displayHDR10+ | Dolby Vision16,000-step automatic brightness adjustment3840Hz PWM dimming｜TÜV Rheinland Low Blue Light (Hardware Solution) Certified | TÜV Rheinland Circadian Friendly Certified | TÜV Rheinland Flicker Free Certified
- MediaTek Dimensity 7400-Ultra4nm manufacturing process technologyCPU: Octa-core processor, up to 2.6GHzGPU: Mali-G615
- 200MP main cameraOptical Image Stabilization (OIS)0.56μm, 16in1, 2.24μmf/1.77P lens1/1.4" sensor size8MP ultra-wide cameraf/2.2Rear camera video recording4K at 30 fps1080p at 30/60 fps720p at 30 fps / Front Camera 20MP front camera1/4" sensor sizef/2.24P lensFront camera video recording1080p at 30/60 fps720p at 30 fps
Are the processors or cameras better?
Processor
The Redmi is listed with a Snapdragon 6s Gen 3, and the vivo with a Dimensity 6300. The available specifications do not establish which is faster in these exact phones. A processor name or peak clock figure is not a substitute for comparable benchmark results or testing of everyday use, gaming and heat management.
Cameras
Both phones are listed with a 50MP main rear camera. vivo India also specifies a 0.08MP secondary rear camera and a 5MP front camera; comparison listings give the Redmi an 8MP front camera. Redmi’s higher listed selfie-camera resolution is an on-paper difference, not proof of better selfies. Megapixels alone do not establish image quality, and the available material does not include a direct camera comparison.
Rank #3
- USA MARKET ONLY WORK ON TMOBILE MINT TELLO OR ANY UNDER TMOBILE NETWORK PHONE NEEDS A SIM CARD ALREADY ACTIVATED ,OUTSIDE USA WORKS ANY GSM CARRIER SIM GSM FCC ID: 2AFZZRA29G
- Dual SIM (nano SIM + nano SIM or nano SIM + eSIM) NO MICRO SD SLOT. 5G: n1/2/3/5/7/8/12/20/26/28/38/40/41/48/66/77/78 - 4G: LTE FDD: 1/B2/B3/B4/B5/B7/B8/B12/B13/B17/B18/B19/B20/B26/B28/B32/B66 4G: LTE TDD: B38/B40/B41/B42/B48 - 3G: WCDMA: B1/B2/B4/B5/B6/B8/B19 - 2G: GSM: B2/B3/B5/B8
- 6.83" AMOLED displayResolution: 1.5K (2772 x 1280)Refresh rate: Up to 120HzTouch sampling rate: Up to 480HzInstantaneous touch sampling rate: 2560Hz*Activated in Game Turbo modeBrightness: 3200 nits peak brightnessBrightness: HBM 1800 nitsColor depth: 12bitContrast ratio: 8000000:1DCI- P3 wide color gamut447PPICorning Gorilla Glass Victus 2Sunlight displayHDR10+ | Dolby Vision16,000-step automatic brightness adjustment3840Hz PWM dimming｜TÜV Rheinland Low Blue Light (Hardware Solution) Certified | TÜV Rheinland Circadian Friendly Certified | TÜV Rheinland Flicker Free Certified
- MediaTek Dimensity 7400-Ultra4nm manufacturing process technologyCPU: Octa-core processor, up to 2.6GHzGPU: Mali-G615
- 200MP main cameraOptical Image Stabilization (OIS)0.56μm, 16in1, 2.24μmf/1.77P lens1/1.4" sensor size8MP ultra-wide cameraf/2.2Rear camera video recording4K at 30 fps1080p at 30/60 fps720p at 30 fps / Front Camera 20MP front camera1/4" sensor sizef/2.24P lensFront camera video recording1080p at 30/60 fps720p at 30 fps
What is the price difference?
At the time 91mobiles was accessed, its comparison page displayed ₹21,499 for the Redmi 15 5G and ₹21,699 for the vivo Y21 5G—a ₹200 snapshot difference in favor of Redmi. The page figures are not confirmed as prices for the same RAM and storage configuration, seller, or offer conditions, so they do not establish that the Redmi is the cheaper buy.
Separately, vivo India’s product page displayed a ₹32,999 MRP for the 4GB+128GB Y21 5G listing and marked the selected item unavailable. That official-store listing is not directly comparable with the 91mobiles price snapshot. Prices vary by variant, seller and offer; check the live listing.
Rank #4
- USA MARKET ONLY WORK ON TMOBILE MINT TELLO OR ANY UNDER TMOBILE NETWORK PHONE NEEDS A SIM CARD ALREADY ACTIVATED ,OUTSIDE USA WORKS ANY GSM CARRIER SIM GSM FCC ID: 2AFZZRAD4G
- nano SIM 1 + Hybrid (nano SIM or microSD) Dual standby , n1/2/3/5/7/8/12/20/26/28/38/40/41/48/66/77/78 4G : B1/2/3/4/5/7/8/12/13/17/18/19/20/26/28/32/66 4G: LTE TDD: B38/40/41/42/48 3G: WCDMA: Band 2/4/5/8 2G: GSM: Quad Band.
- 6.77" AMOLED displayResolution: 2392 × 1080Refresh rate: Up to 120HzTouch sampling rate: 240HzBrightness: 3200 nits peak brightness, 800 nits (typ)Colour depth: 12 bitContrast ratio: 8,000,000:1DCI- P3 wide color gamutSunlight displayReading mode3840Hz PWM dimming｜16,000-level brightness adjustmentScreen-to-body ratio: 92%*Data obtained from Xiaomi Internal Labs. Actual results may vary.TÜV Rheinland Low Blue Light (Hardware Solution) Certified TÜV Rheinland Circadian Friendly Certified TÜV Rheinland Flicker Free Certified
- Snapdragon 6 Gen 3 Mobile Platform4nm manufacturing process technologyCPU: Octa-core processor, up to 2.4GHzGPU: Adreno
- Virtual proximity sensor | Ambient light sensor | Accelerometer | Electronic compass | IR blaster | Gyroscope / GPS: L1 | GLONASS: G1 | BDS: B1I | Galileo E1 / Wireless NetworksBluetooth 5.3Wi-Fi Protocol: 802.11a/b/g/n/ac Supports 2.4GHz Wi-Fi | 5GHz Wi-Fi Wi-Fi Direct / In-screen fingerprint sensorAI Face Unlock
Before deciding, compare the same RAM and storage configuration from sellers you can actually buy from. Check whether a displayed price requires a bank discount, exchange, or other condition, and note the date and seller. The comparison prices are snapshots, not guaranteed current offers.
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Software and durability details to verify
Software labels in the listings differ: 91mobiles shows Android 15 with HyperOS for the Redmi, while vivo India names OriginOS 6 for the Y21 5G and comparison sources label it Android 16. Software naming and versions are region- and update-sensitive. Confirm the operating system and update information shown for the exact Indian retail variant before purchase.
Durability specifications for the vivo are inconsistent across the cited pages: vivo India highlights SGS 5-Star Drop certification and IP65, while Gadgets 360 reports IP54. Gadgets 360 lists IP64 for the Redmi. Because the vivo figures conflict, do not use them as a reliable basis for an IP-rating comparison without documentation for the exact variant. An IP rating and a drop certification describe different claims; neither guarantees protection from every kind of damage.
Quick Recap
Which phone should you choose?
- Choose the Redmi 15 5G if the larger, higher-resolution, higher-refresh display and greater listed battery capacity are your priorities.
- Consider the vivo Y21 5G if its higher listed charging wattage, preferred software experience or a suitable verified retail offer matters more to you.
- Do not choose on performance, camera quality or value alone based on these specifications: the sources do not provide a direct performance or camera test, and the available prices are not a verified same-variant comparison.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
