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Logitech K780 vs K585: Match Your Devices and Desk-Moving Kit

Choose K780 for three devices you want to keep paired. Choose K585 when two are enough and you favor its lower manufacturer-listed mass for a keyboard you move between desks; this is not a tested portability advantage. Both include a number pad, device cradle and AAA power.

Published by Pickoryx · Published 2026-10-09

Source checked 2026-10-09 03:06 UTC

Products compared

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The buying question

Is a third stored device worth choosing K780 over the lower-listed-mass K585?

K780 keeps three devices paired; K585 stops at two but has a lower manufacturer-listed mass. Both retain a cradle, number pad and AAA power.

Quick verdict

When the recommendation changes
  • A third regular typing destination makes the K780 channel useful even if you move desks.
  • If the keyboard stays at one desk and two channels suffice, listed mass has little bearing on the choice; compare current offers and try the key layouts.

The differences that matter

Stored Device Channels

Logitech K585 (Graphite, US QWERTY, 920-011479)

Two stored device channels; the included receiver is pre-paired on the first channel.[3]

Logitech K780 (Dark Grey/Speckled White, US QWERTY, 920-008025)

Three stored device channels using Bluetooth or the included receiver.[4]

What this changes: Count the devices you want to keep paired before comparing prices. A computer plus phone uses both K585 channels; adding a tablet creates a reason to choose K780. These are switchable typing destinations, not simultaneous typing outputs.[3, 4]

The better fit depends on your priorities

Listed Mass And Width

Logitech K585 (Graphite, US QWERTY, 920-011479)

Logitech lists 558 g with batteries and a width of 373.5 mm.[1]

Logitech K780 (Dark Grey/Speckled White, US QWERTY, 920-008025)

Logitech lists 875 g and a width of 380 mm; battery inclusion in that weight is not specified.[2]

What this changes: For a keyboard you move between desks, K585 has the lower listed mass. Use the published figures as packing guidance, not a measured same-condition weight saving. Width is only a small difference and is unlikely to decide the purchase unless your space is tightly constrained.[1, 2]

The better fit depends on your priorities

Best for your routine

Two-device routine with a keyboard packed between desks

Best fit: Logitech K585 (Graphite, US QWERTY, 920-011479)

Based on listed features, not comparative testing.

K585 covers two paired devices and has the lower published mass. This choice sacrifices the third channel; carrying comfort and bag fit were not tested.

View Logitech K585 (Graphite, US QWERTY, 920-011479) on AmazonPaid link

Value and trade-offs

One or both observed offers have eligibility conditions, so no unrestricted price difference is shown.

If K780 costs more in the offers you are comparing, its third channel is the clearest reason to pay more. For two devices at a fixed desk, that extra channel may bring little value; compare the actual offers rather than assuming either model is always cheaper.

There is not enough price-history evidence here to recommend buying now or waiting.

Limitations

  • Published mass is not a controlled comparison: K585 explicitly includes batteries, while K780 does not specify that condition. No percentage or exact carried-weight saving is claimed.
  • No hands-on comparison establishes better typing feel, noise, comfort, stability, switching reliability or battery life.
  • Cradle suitability depends on your device and case. Do not assume that Bluetooth tablet support means every tablet fits the K585 phone cradle.

Questions shoppers ask

Does using the USB receiver give the K585 a third device?

No. Logitech places the pre-paired receiver on its first Easy-Switch channel; K585 still has two channels in total. Count the receiver-connected computer as one of your two devices.

Do I lose the number pad or replaceable batteries by choosing K585?

No. Both keyboards include a number pad and use two AAA batteries. Both also have a device cradle, but confirm physical fit for the phone or tablet and case you intend to use.

Methodology and sources

Compared stored device channels, manufacturer-listed mass and width, and shared number-pad, cradle and battery features for the specified US versions.

AI assistance organized the source research and helped draft this comparison.

View 4 sources
  1. 1.Logitech K585 Multi-Device Wireless Keyboard — US product specificationsLogitech · Official specifications · Source checked 2026-10-09 03:03 UTC
    Evidence used on this page
    • Easy-Switch and number-pad/phone-cradle feature sections; embedded productDimensions: Keyboard (with batteries), Width and Weight; technicalSpecs battery and packageContents; JSON-LD model 920-011479.: Two-device switching, number pad, built-in phone cradle, 373.5 mm width and 558 g explicitly including batteries; two AAA cells; exact Graphite US QWERTY part.
  2. 2.Logitech K780 Multi-Device Wireless Keyboard — US product specificationsLogitech · Official specifications · Source checked 2026-10-09 03:03 UTC
    Evidence used on this page
    • Multi-device flow and integrated cradle feature sections; embedded productDimensions Keyboard Width and Weight; technicalSpecs battery and packageContents; JSON-LD model 920-008025.: Three-device switching, number pad and integrated cradle; width 380 mm and listed weight 875 g without explicit battery-inclusion qualifier; two AAA cells; exact Dark Grey/Speckled White US QWERTY part.
  3. 3.Pair your K580/K585 to a second device with Easy-SwitchLogitech Support · Official support · Source checked 2026-10-09 03:03 UTC
    Evidence used on this page
    • Pairing instructions, lines 48–68: up to two devices, pre-paired receiver uses first channel, short press switches channel.: K585 has two channels total across its Bluetooth/receiver connections; the receiver does not add a third channel.
  4. 4.K780 Multi-Device Keyboard guideLogitech · Official specifications · Source checked 2026-10-09 03:03 UTC
    Evidence used on this page
    • PDF page 3 Get Connected/Dual Connectivity, pages 4–5 channel pairing.: Up to three devices through Bluetooth or the included pre-paired Unifying receiver; numbered Easy-Switch channel setup.

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