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Logitech MX Keys S vs K780: Which Desk and Power Setup Fits You?

K780 is the documented choice for a built-in phone/tablet cradle and a narrower, deeper footprint; MX Keys S is the documented choice for backlit keys and USB-C charging while typing, with a wider, shallower footprint. Verify the MX Keys S holder arrangement if you need a stand. Neither feature list establishes typing-quality superiority.

Published by Pickoryx · Published 2026-10-02

Source checked 2026-10-02 08:07 UTC

Products compared

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The buying question

Would an integrated phone/tablet cradle and a narrower keyboard footprint help more, or do you prefer backlit keys and USB-C rechargeable upkeep?

The K780 has an integrated device cradle, is narrower side-to-side, and uses replaceable AAA cells without backlighting. The MX Keys S is wider but shallower, has backlit keys, and can charge over USB-C while typing. The MX's holder arrangement is unconfirmed here; check your own stand needs before purchase.

Quick verdict

Choose Logitech MX Keys S (Graphite, 920-011558) if

  • You want backlit keys with adjustable behavior and USB-C charging while continuing to type.
  • Your desk can accommodate the MX Keys S's wider, shallower footprint, and you have a separate mobile-device support plan if you need one.
View Logitech MX Keys S (Graphite, 920-011558) on AmazonPaid link
When the recommendation changes
  • If a built-in place to prop up a phone/tablet is important, K780 documents an integrated cradle for supported devices; MX Keys S holder support was not established in the sources checked, so verify the accessory/setup you intend to use.
  • If low-light key illumination and charging without pausing typing matter, MX Keys S documents adjustable backlighting and USB-C charging while typing; if you prefer to avoid illumination and swap cells, K780 documents no backlight and two replaceable AAA batteries.
  • Check device thickness up to 11.3 mm for the K780 cradle and compare both published desk footprints with your available space.

The differences that matter

Device Cradle And Desk Footprint

Logitech MX Keys S (Graphite, 920-011558)

The MX Keys S is 430.20 mm long side-to-side and 131.63 mm deep front-to-back. Whether a particular phone/tablet holder is built in is not established here; plan on a separate support only if you need one and confirm your preferred setup.[3]

Logitech K780 Multi-Device Wireless Keyboard (Speckled White, 920-008025)

The K780 is 380 mm side-to-side and 153 mm front-to-back. Its built-in rubber cradle holds phones through a 12-inch iPad class, with supported device thickness up to 11.3 mm.[4, 5]

What this changes: K780 is narrower side-to-side but deeper front-to-back and directly accommodates a supported phone or tablet in its built-in cradle. MX Keys S is wider and shallower; its holder arrangement is unconfirmed by the sources used, so check that separately if a raised screen is part of your desk setup.[3, 4, 5]

The better fit depends on your priorities

Power And Illumination Maintenance

Logitech MX Keys S (Graphite, 920-011558)

MX Keys S has backlit keys with ambient/hand-proximity behavior, adjustable backlight settings, a rechargeable battery, and USB-C charging while typing. Backlighting is disabled in bright conditions and at low battery.[1, 2, 3]

Logitech K780 Multi-Device Wireless Keyboard (Speckled White, 920-008025)

K780 has no backlighting and uses two replaceable AAA batteries; Logitech support gives instructions to replace both when low.[5, 6]

What this changes: Choose based on the upkeep you prefer: MX Keys S can illuminate keys and recharges by USB-C while you continue typing, with illumination affecting battery use; K780 avoids a backlight and uses two replaceable cells when needed. Manufacturer runtime claims are not directly compared here.[2, 3, 5, 6]

The better fit depends on your priorities

Best for your routine

Desk setups that need an integrated, supported phone/tablet cradle and favor a narrower keyboard width.

Best fit: Logitech K780 Multi-Device Wireless Keyboard (Speckled White, 920-008025)

Based on listed features, not comparative testing.

K780's official product page documents the built-in cradle and its specs are narrower side-to-side; MX Keys S holder support was not confirmed here.

View Logitech K780 Multi-Device Wireless Keyboard (Speckled White, 920-008025) on AmazonPaid link

Users who want illuminated keys and a rechargeable keyboard that can continue typing while connected to USB-C power.

Best fit: Logitech MX Keys S (Graphite, 920-011558)

Based on listed features, not comparative testing.

Logitech documents MX Keys S backlighting and charging while typing; K780 specs list no backlight and two replaceable cells.

View Logitech MX Keys S (Graphite, 920-011558) on AmazonPaid link

Value and trade-offs

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

Compare the current offers at checkout and pay for the desk-fit or maintenance features you will use; no fixed premium is assumed in this article.

Compare the current offers and condition at checkout; the available price information is not enough to say whether to buy now or wait.

Limitations

  • The sources do not confirm a built-in device cradle for MX Keys S; verify the holder arrangement you want rather than treating this as a confirmed absence.
  • No direct typing-quality, comfort, durability or battery-runtime comparison was performed. Manufacturer runtime figures depend on settings and are not treated as a side-by-side test.
  • No fixed price, seller, condition, shipping term or Prime status is asserted; compare the exact product offers available to you at checkout.

Questions shoppers ask

Will my tablet fit in the K780 cradle?

Logitech says the cradle supports a device up to 11.3 mm thick and describes support for phones through a 12-inch iPad class. Check your tablet's thickness and orientation before buying.

Does MX Keys S have a built-in phone stand?

The Logitech material used here does not confirm an integrated cradle for MX Keys S. If you need a stand, verify whether your preferred separate support fits your workspace.

Do both keyboards use the same kind of battery?

No. MX Keys S has a rechargeable battery and can charge by USB-C while you type; K780 uses two replaceable AAA batteries and does not have backlit keys.

Methodology and sources

Compared documented cradle/footprint fit and power/illumination upkeep. Recommendations are feature-fit choices; no typing, comfort, reliability, or runtime winner was tested.

AI assisted research and drafting; product details were checked against the Logitech product and support documents cited here. No hands-on typing or battery test was conducted.

View 6 sources
  1. 1.MX Keys S — LogitechLogitech · Official specifications · Source checked 2026-10-02 08:06 UTC
    Evidence used on this page
    • Official US MX Keys S product family page; key feature sections for smart illumination (hands-approach and ambient adjustment), up to three devices and product identity. The page currently renders a different color selector; use it for family features, not as proof of the assigned graphite finish.: Documents MX Keys S family backlighting, multi-device switching and feature workflow; exact graphite/P/N identity is bridged separately by the assigned current product record and its 920-011558 variant URL.
  2. 2.Getting Started - MX Keys SLogitech Support · Official support · Source checked 2026-10-02 08:05 UTC
    Evidence used on this page
    • Sections ‘Choose how you want to connect’ and ‘Pair to a second computer’ (Bluetooth or included Logi Bolt; up to three computers); ‘Battery Status Notification’ (USB-C charging while typing); ‘Smart backlighting’ (ambient sensor, Options+ customization, and backlight disabled in bright rooms or at low battery).: Documents the connection choices, three-device switching, USB-C charge-while-typing and the backlight's controls/conditions for MX Keys S.
  3. 3.Specification - MX Keys SLogitech Support · Official support · Source checked 2026-10-02 08:06 UTC
    Evidence used on this page
    • Physical Specifications list keyboard 20.5 mm high x 131.63 mm wide x 430.20 mm long and 810 g; battery specification lists 1500 mAh rechargeable battery, backlighting yes, and USB-A-to-USB-C power input. General product specification says runtime varies with backlight setting; no cross-model runtime comparison used.: MX Keys S support specifications provide physical footprint orientation and rechargeable/backlit power details.
  4. 4.Logitech K780 Multi-Device Wireless KeyboardLogitech · Official specifications · Source checked 2026-10-02 08:05 UTC
    Evidence used on this page
    • US product page URL selects P/N 920-008025; page lists Speckled White and sections ‘Multi-device flow,’ ‘Compact with an integrated cradle,’ and ‘Flexible and compatible’: up to three devices, rubber cradle accommodating phones through a 12-inch iPad, Bluetooth/Unifying receiver, and OS families.: Exact US K780 product page bridges the assigned Speckled White product number and documents its cradle, multi-device use and connectivity.
  5. 5.Especificações técnicas do teclado bluetooth K780 para múltiplos dispositivosLogitech Support · Official support · Source checked 2026-10-02 08:06 UTC
    Evidence used on this page
    • Official K780 specs: keyboard dimensions 22 x 380 x 153 mm; replaceable 2 x AAA; no backlight; smart-device holder accepts up to 11.3 mm thickness and up to 12-inch iPad class. Portuguese-language support page; numeric facts are product-family specifications, not region-specific price/offer claims.: Official K780 specifications establish footprint orientation, replaceable-cell arrangement, no backlight and supported holder thickness.
  6. 6.K780 keyboard battery life and replacementLogitech Support · Official support · Source checked 2026-10-02 08:05 UTC
    Evidence used on this page
    • Battery level and replace batteries sections: status LED changes when power is low; remove the cover and replace spent batteries with two new AAA cells.: Official support instructions confirm the K780 maintenance action is replacement of two AAA cells.

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