Average score
Product 1: Logitech G515 Lightspeed
4.0
Product 2: Logitech G915 X Lightspeed
4.0
acoustics
Product 1: Logitech G515 Lightspeed
4.4

Reviews describe a pleasant overall sound with foam reducing ping and rattle, though one review still heard some plasticky rattle.

Product 2: Logitech G915 X Lightspeed
3.7

Sound is noticeable rather than muted overall: some reviews like the intentional clack and muted tactile note, while others mention rattling and metallic ping.

actuation consistency
Product 1: Logitech G515 Lightspeed
4.4

One review found the switch feel reasonably consistent across all keys.

Product 2: Logitech G915 X Lightspeed
4.1

Reviews describe quick, consistent registration, but the light actuation can also cause accidental double presses until the user adapts.

analog input support
Product 1: Logitech G515 Lightspeed
No score yet
Product 2: Logitech G915 X Lightspeed
1.1

Reviews explicitly note that analog input is absent, and some compare the board unfavorably with analog-equipped rivals.

backlight brightness
Product 1: Logitech G515 Lightspeed
3.9

Backlighting is visible and generally attractive, but brightness is not class-leading and some reviews found it dimmer than top rivals.

Product 2: Logitech G915 X Lightspeed
4.6

Backlight brightness is easy to adjust from the keyboard, with multiple levels and the option to turn lighting off completely.

battery life
Product 1: Logitech G515 Lightspeed
4.2

Battery life is good rather than class-leading, with several tests clustering around the mid-30s to mid-40s hours with lighting and longer runtimes possible with power-saving settings.

Product 2: Logitech G915 X Lightspeed
4.6

Battery life is one of the clearest strengths, with repeated reports of mid-30s to around 100 hours with lighting on and up to 800 to 1000 hours with lighting off.

build quality
Product 1: Logitech G515 Lightspeed
4.4

Despite the plastic chassis, reviews consistently describe the board as solid, sturdily built, and better made than the price might suggest.

Product 2: Logitech G915 X Lightspeed
4.8

Reviewers consistently frame the board as premium, polished, sturdy, and exceptionally well built.

cable quality
Product 1: Logitech G515 Lightspeed
4.3

The included USB-C cable is described as rubberized, flexible, and perfectly serviceable for charging or wired use.

Product 2: Logitech G915 X Lightspeed
4.4

The included cable is described as long enough for flexible setup and not cheap or flimsy.

compatibility
Product 1: Logitech G515 Lightspeed
4.3

Compatibility evidence includes macOS support, pairing with compatible Logitech Lightspeed devices, multi-device use, and support for aftermarket low-profile keycaps.

Product 2: Logitech G915 X Lightspeed
4.2

Evidence shows the keyboard working across Windows, Mac, tablets, and secondary devices, though Bluetooth device switching is not always as flexible as some rivals.

connectivity
Product 1: Logitech G515 Lightspeed
4.6

Tri-mode connectivity is a recurring strength, with 2.4GHz Lightspeed, Bluetooth, and wired USB-C all repeatedly confirmed.

Product 2: Logitech G915 X Lightspeed
4.7

Tri-mode connectivity is a major strength, with wired, Bluetooth, and Lightspeed support repeatedly praised for easy switching.

customization options
Product 1: Logitech G515 Lightspeed
4.7

Customization is a major strength, with G Hub and KEYCONTROL providing deep remapping, layering, and setup flexibility beyond basic lighting tweaks.

Product 2: Logitech G915 X Lightspeed
4.8

Customization depth stands out thanks to extensive remapping, layered functions, and broad software control over keys and actions.

desk space efficiency
Product 1: Logitech G515 Lightspeed
4.5

The TKL layout is explicitly praised for freeing up desk space.

Product 2: Logitech G915 X Lightspeed
3.7

Space efficiency depends on version: TKL coverage highlights a compact footprint, while full-size use takes noticeably more desk room.

durability
Product 1: Logitech G515 Lightspeed
4.7

PBT caps and, in one review, a replaceable battery help the G515 make a stronger long-term durability case than many wireless boards.

Product 2: Logitech G915 X Lightspeed
4.7

Durability evidence is positive, with one review reporting the board still worked after water exposure and others emphasizing wear-resistant PBT caps.

ease of switch replacement
Product 1: Logitech G515 Lightspeed
1.2

Switch replacement is limited because the switches are explicitly described as not hot-swappable.

Product 2: Logitech G915 X Lightspeed
1.3

Switch replacement is a weak point because the switches are soldered, and one reviewer describes out-of-warranty replacement as major surgery.

ergonomics
Product 1: Logitech G515 Lightspeed
4.3

Low-profile height and adjustable tilt contribute to a comfortable, easy-to-reach typing posture.

Product 2: Logitech G915 X Lightspeed
4.4

The low-profile design and light actuation help comfort and speed for many users, although angle and layout are not ideal for everyone.

extra gaming features
Product 1: Logitech G515 Lightspeed
3.9

Game Mode and Logitech-specific extras are present, but some reviews still felt the board lacked more advanced gaming hardware features.

Product 2: Logitech G915 X Lightspeed
4.7

Game mode and dedicated extra keys add useful gaming-specific control, especially for locking keys and assigning shortcuts.

frame rigidity
Product 1: Logitech G515 Lightspeed
4.4

Despite its slim plastic build, the frame is described as hard to bend with very little flex.

Product 2: Logitech G915 X Lightspeed
4.8

The chassis is repeatedly described as rigid and stable, with little to no flex in normal use.

gaming performance
Product 1: Logitech G515 Lightspeed
4.3

Gaming performance is generally strong and responsive, though the board is not positioned as the most hardcore esports feature set.

Product 2: Logitech G915 X Lightspeed
4.6

Gaming performance is consistently strong, with responsive inputs and no meaningful lag called out in actual play.

hot-swappable switches
Product 1: Logitech G515 Lightspeed
1.2

Multiple reviews explicitly note that the switches are not hot-swappable.

Product 2: Logitech G915 X Lightspeed
1.0

Multiple reviews explicitly say the switches are not hot-swappable.

keycap quality
Product 1: Logitech G515 Lightspeed
4.3

Double-shot PBT keycaps are a repeated highlight for texture, grip, and durability, though some reviewers still criticized flatness, looseness, or smoothness.

Product 2: Logitech G915 X Lightspeed
4.4

Double-shot PBT keycaps are broadly viewed as an upgrade for durability and texture, even if not every reviewer loves the feel.

key responsiveness
Product 1: Logitech G515 Lightspeed
4.5

Short-travel switches and responsive action make inputs feel quick across both work and gaming.

Product 2: Logitech G915 X Lightspeed
4.5

The keys are widely described as snappy, responsive, and quick to register.

key spacing
Product 1: Logitech G515 Lightspeed
4.1

Key spacing is described as familiar and close to a standard ANSI layout, which eases adaptation.

Product 2: Logitech G915 X Lightspeed
4.5

The roomier spacing on some versions is called helpful for shortcuts and finger placement.

key stability
Product 1: Logitech G515 Lightspeed
3.9

Key stability is mostly positive, with some reviews praising minimal wobble and others noting more movement than ideal.

Product 2: Logitech G915 X Lightspeed
4.2

Key stability looks improved overall, though one review still notices a minor wobble.

latency
Product 1: Logitech G515 Lightspeed
4.4

2.4GHz Lightspeed is repeatedly described as low-latency or lag-free, while Bluetooth carries the usual latency penalty.

Product 2: Logitech G915 X Lightspeed
4.8

Wireless latency is repeatedly described as very low and close to wired behavior.

layout options
Product 1: Logitech G515 Lightspeed
4.2

The board sticks to a familiar TKL layout rather than offering alternate size variants, and reviewers found that layout practical and easy to learn.

Product 2: Logitech G915 X Lightspeed
4.7

Review coverage confirms both full-size and TKL layout options in the lineup.

legend visibility
Product 1: Logitech G515 Lightspeed
4.0

Shine-through legends are generally easy to read, but a few reviews noted uneven illumination or incomplete legend coverage on some keys.

Product 2: Logitech G915 X Lightspeed
3.5

Legend visibility is good with lighting on, but some reviews say readability drops when RGB is off or coverage is uneven on certain keys.

macro customization
Product 1: Logitech G515 Lightspeed
4.7

Macro and layer functionality is deep, with several reviews highlighting the ability to assign up to 15 functions per key.

Product 2: Logitech G915 X Lightspeed
4.8

Macro support is a real strength, with dedicated G keys, KEYCONTROL, direct recording, and layered assignment options.

materials quality
Product 1: Logitech G515 Lightspeed
4.3

Materials quality lands above expectations for the price, with sturdy plastics and a generally premium-feeling finish.

Product 2: Logitech G915 X Lightspeed
4.8

Brushed aluminum and upgraded PBT caps are repeatedly highlighted as premium material choices.

media controls
Product 1: Logitech G515 Lightspeed
2.8

Media functions exist, but mostly as secondary Fn commands rather than dedicated hardware controls.

Product 2: Logitech G915 X Lightspeed
4.8

Dedicated media controls are consistently useful and well executed.

noise level
Product 1: Logitech G515 Lightspeed
4.3

The board is repeatedly described as quiet or audibly muted for a mechanical keyboard.

Product 2: Logitech G915 X Lightspeed
3.4

Noise varies by switch and preference, ranging from office-manageable to quite loud during heavy typing.

onboard memory
Product 1: Logitech G515 Lightspeed
4.6

Onboard or built-in memory is confirmed for storing settings, profiles, or lighting when moving between systems.

Product 2: Logitech G915 X Lightspeed
3.8

Some settings and profiles can be stored on the device, but richer behavior and complex macros still depend heavily on software.

passthrough features
Product 1: Logitech G515 Lightspeed
1.0

One review explicitly notes the absence of a USB passthrough port.

Product 2: Logitech G915 X Lightspeed
No score yet
per-key lighting control
Product 1: Logitech G515 Lightspeed
4.6

Per-key RGB control is directly supported through Logitech software.

Product 2: Logitech G915 X Lightspeed
4.8

Per-key lighting control is clearly supported, with individual key color changes available in software.

polling rate
Product 1: Logitech G515 Lightspeed
4.5

One review explicitly confirms a 1,000 Hz wireless polling rate.

Product 2: Logitech G915 X Lightspeed
3.8

Evidence supports a gaming-grade 1000 Hz report rate, but not a class-leading one versus faster rivals.

portability
Product 1: Logitech G515 Lightspeed
4.3

The slim TKL shape, dongle storage, and travel-friendly framing make the keyboard easy to carry and use in tighter spaces.

Product 2: Logitech G915 X Lightspeed
4.0

The slim design helps portability, especially for TKL coverage, but full-size versions are less bag-friendly.

profile management
Product 1: Logitech G515 Lightspeed
4.5

Reviews describe multiple profiles, presets, community profile sharing, or per-program configs, giving the board solid profile-management flexibility.

Product 2: Logitech G915 X Lightspeed
4.6

App-specific and game-specific profile management is supported and repeatedly mentioned as useful.

rapid trigger support
Product 1: Logitech G515 Lightspeed
1.0

A review explicitly flags the absence of rapid-trigger-style features.

Product 2: Logitech G915 X Lightspeed
1.1

Reviews explicitly note that rapid trigger support is absent, with some rivals offering it instead.

reliability
Product 1: Logitech G515 Lightspeed
4.6

Connection stability and day-to-day reliability are called out as strong.

Product 2: Logitech G915 X Lightspeed
4.7

Day-to-day reliability is positive in the evidence, with reviewers reporting stable use and no meaningful issues.

RGB customization
Product 1: Logitech G515 Lightspeed
4.5

G Hub allows custom RGB effects and animations rather than limiting users to presets alone.

Product 2: Logitech G915 X Lightspeed
4.6

RGB customization is deep overall, with broad effect and assignment control, though one review wanted more flexible effect mixing.

RGB lighting quality
Product 1: Logitech G515 Lightspeed
4.0

RGB looks clean and appealing overall, but several reviews note uneven legends or less-than-ideal consistency across the lighting.

Product 2: Logitech G915 X Lightspeed
4.4

Lighting is generally bright and attractive, with only minor complaints about coverage or presentation in some cases.

size and form factor
Product 1: Logitech G515 Lightspeed
4.6

The 22mm-tall low-profile TKL form factor is one of the keyboard’s clearest strengths.

Product 2: Logitech G915 X Lightspeed
4.6

The low-profile, ultra-thin form factor is one of the product's biggest strengths, though full-size versions take more room.

software quality
Product 1: Logitech G515 Lightspeed
4.6

G Hub is broadly seen as capable and feature-rich, with strong programming tools, though some reviews imply a learning curve.

Product 2: Logitech G915 X Lightspeed
3.5

G Hub offers a lot of power, but the reviews are mixed: some find it clean and easy, while others call it overcomplicated, unintuitive, or unstable.

sound dampening
Product 1: Logitech G515 Lightspeed
4.4

Foam and layered dampening are repeatedly cited as meaningful contributors to the quieter sound.

Product 2: Logitech G915 X Lightspeed
3.1

Sound dampening is only moderate because some reviews mention rattling, ping, or a lack of deeper sound tuning.

stabilizer quality
Product 1: Logitech G515 Lightspeed
4.5

Direct stabilizer evidence is positive, with one review saying they do their job well and keep wobble low on larger keys.

Product 2: Logitech G915 X Lightspeed
4.8

At least one review specifically praises the space bar as solid and stable.

switch feel
Product 1: Logitech G515 Lightspeed
4.6

Switch feel is generally praised as tactile, smooth, and satisfying for a low-profile board.

Product 2: Logitech G915 X Lightspeed
4.4

Switch feel is generally satisfying and responsive, though some reviewers mention resistance, mushiness, or adaptation issues.

switch options
Product 1: Logitech G515 Lightspeed
4.3

Buyers get tactile or linear switch choices, but the scored reviews do not support a third clicky option.

Product 2: Logitech G915 X Lightspeed
4.7

The lineup consistently offers tactile, linear, and clicky switch options.

typing comfort
Product 1: Logitech G515 Lightspeed
4.5

Typing comfort is consistently strong once users adjust to the low-profile form factor.

Product 2: Logitech G915 X Lightspeed
3.9

Typing comfort is good for many users thanks to the low profile, but layout and angle can still hurt comfort for others.

typing feel
Product 1: Logitech G515 Lightspeed
4.7

Typing feel is a standout, with reviewers describing it as fast, satisfying, and productive.

Product 2: Logitech G915 X Lightspeed
4.1

The typing experience lands well for several reviewers, though it is not universally praised.

value for money
Product 1: Logitech G515 Lightspeed
4.1

Value is viewed as good but not unbeatable, with a lower price than pricier Logitech low-profile models offset by a few compromises.

Product 2: Logitech G915 X Lightspeed
3.3

The feature set is strong, but the premium price keeps value mixed rather than an obvious win.

volume control
Product 1: Logitech G515 Lightspeed
1.9

Volume adjustment exists through secondary keys, but the missing dial or dedicated controls is a recurring complaint.

Product 2: Logitech G915 X Lightspeed
4.7

The volume roller or wheel is one of the most consistently praised physical controls on the board.

wireless performance
Product 1: Logitech G515 Lightspeed
4.6

Lightspeed wireless performance is one of the product’s most consistent strengths, with repeated praise for stability and wired-like behavior.

Product 2: Logitech G915 X Lightspeed
4.7

Wireless performance is widely described as stable, fast, and close to wired use, with generally strong range.

wrist rest quality
Product 1: Logitech G515 Lightspeed
1.5

There is no included wrist rest, and several reviews mention that absence as a drawback even if the low profile reduces the need.

Product 2: Logitech G915 X Lightspeed
1.0

Reviews note that no wrist rest or palm rest is included, so support in this area is limited.