Camera Comparison · UK 2026
Reolink Altas vs Arlo Ultra 3

Specs, pros and cons compared side by side

Both the Reolink Altas and the Arlo Ultra 3 are security cameras. This head-to-head sets them side by side using the specs, pros and cons from our full reviews. Reolink specs come from Reolink’s own product pages; Arlo specs come from our Arlo review, checked against Arlo’s own pages.

Quick verdict

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Reolink Altas

Pick it for: Records to microSD up to 512GB without a hub (the Ultra 3: needs an Arlo SmartHub for local storage) · IP66 weather rating (the Ultra 3: IP65)

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Arlo Ultra 3

Pick it for: 4K HDR video (the Altas: 4MP, 2560 x 1440) · Works with Apple Home and IFTTT (the Altas: Google Assistant and Alexa)

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Quick comparison

Spec Reolink Altas Arlo Ultra 3
Resolution 4MP (2560 x 1440), 110° diagonal 4K HDR
Power 20,000mAh battery, up to 540 days (motion mode); Solar Panel 2 (6W) sold separately Removable battery
Wi-Fi Wi-Fi 6, 2.4GHz and 5GHz 2.4GHz or 5GHz (via the SmartHub)
Weather rating IP66 IP65
Storage microSD up to 512GB, Reolink Home Hub and Home Hub Pro, Reolink Cloud Cloud (Arlo Secure); local via the SmartHub
Smart home Google Assistant and Alexa Alexa, Apple Home, Google Assistant, IFTTT
Reolink Altas

Pros

  • A 540-day battery rating in motion detection mode
  • Continuous and pre-recording options on battery
  • Colour night vision
  • Dual-band Wi-Fi 6

Cons

  • No infrared night vision
  • Solar panel sold separately
  • Fixed view, no pan or tilt
  • 4MP rather than 4K
Arlo Ultra 3

Pros

  • 4K HDR video with a 180° view
  • 12x zoom with auto-tracking
  • Rechargeable battery that you can swap

Cons

  • Needs an Arlo SmartHub
  • Cloud history needs an Arlo Secure plan

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Which should you buy?

Why choose the Reolink Altas

  • Records to microSD up to 512GB without a hub (the Ultra 3: needs an Arlo SmartHub for local storage)
  • IP66 weather rating (the Ultra 3: IP65)
Why choose the Arlo Ultra 3

  • 4K HDR video (the Altas: 4MP, 2560 x 1440)
  • Works with Apple Home and IFTTT (the Altas: Google Assistant and Alexa)

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