Specs
Keychron K3 Max
The most complete low-profile keyboard sheet in this cluster, and the only one that quietly prints two different polling rates
Scored on the published rubric, from documentation, pricing and verified user reports.
Best for: A buyer who wants the longest specification list in the low-profile class, is willing to read the long block rather than the short one, and can live with a 12-month warranty that replaces parts instead of keyboards.
Verdict
The Keychron K3 Max prints more rows than any other low-profile wireless sheet in this cluster, and it is the only one here that labels its height figures by keycap basis. Keychron publishes 84 keys in a 75 percent ANSI layout, 12 multimedia keys, north-facing Gateron or Keychron low-profile mechanical switches, hot-swap support, a 1550 mAh li-polymer battery, around 73 hours of wireless use with the backlight off and around 42 hours with RGB at lowest brightness, 2.4 GHz, Bluetooth 5.1 and USB-C wired connection, a 306 x 116 mm footprint, 525 g, four separate height figures from 11 mm to 22 mm, three typing angles, an ARM Cortex-M4 STM32F402 with 256KB flash, and an operating range of -10 C to 50 C. This is a documentation review built from that page rendered in a headless browser on October 26, 2026, plus the warranty page on the same domain. Nobody here typed on one. Two rows argue with each other: the short specification list says 1000 Hz polling, the long block says 90 Hz over Bluetooth.
Visit Keychron K3 Max
We have no affiliate relationship with this vendor. Link goes to the official site.
Where it is strong
- Four labelled height figures: 11 mm and 15 mm without keycaps, 17 mm and 22 mm with them, front and rear each named
- Two runtime rows instead of one: around 73 hours with the backlight off and around 42 hours with RGB at lowest brightness
- Names the controller, an ARM Cortex-M4 32-bit STM32F402 with 256KB flash, which almost no keyboard page prints
- States the hot-swap limit in writing: Gateron and Keychron low-profile mechanical only, because QMK does not support low-profile optical switches
- Cheapest sheet in this cluster at $109.99, and the price carries a priceValidUntil date inside the page markup
- Lightest of the three at 525 g, with the smallest footprint at 306 x 116 mm
Where it falls short
- The short specification list says 1000 Hz polling with no qualifier; the long block says Bluetooth mode runs at 90 Hz
- No switch actuation force anywhere on the page, so the typing feel row cannot be compared on numbers
- The warranty is 12 months, and for the K Max series Keychron states it replaces defective parts rather than the keyboard
- Keycaps and palm rests carry a separate three month warranty, shorter than the keyboard itself
- Returns for non-defective units must be requested within 7 days of arrival and the buyer pays return shipping
- The published rating is 3.92 from 12 reviews, the smallest review count of the three sheets in this cluster
At a glance
| Number of keys | 84 (75 percent), ANSI layout |
|---|---|
| Multimedia keys | 12 |
| Switches | Gateron low-profile mechanical or Keychron Low Profile Mechanical, north-facing, hot-swappable |
| Hot-swap limit | Low-profile mechanical only; the page states QMK does not support low-profile optical switches |
| Frame material | ABS plus aluminium frame |
| Keycap material | Low-profile double-shot PBT |
| Polling rate | 1000 Hz on 2.4 GHz and wired; 90 Hz in Bluetooth mode |
| N-key rollover | Yes in both wireless and wired modes |
| Connection | 2.4 GHz, Bluetooth 5.1, USB-C wired; up to 3 devices |
| Battery | 1550 mAh rechargeable li-polymer |
| Runtime | Around 73 hours backlight off; around 42 hours with RGB at lowest brightness (page marks both as lab figures that may vary) |
| Backlight | 22 types of RGB backlight options |
| Footprint | 306 x 116 mm (12.04 x 4.56 in) |
| Height | 11 mm front and 15 mm rear without keycaps; 17 mm front and 22 mm rear with keycaps |
| Typing angle | 2.5, 4.2 and 6.5 degrees |
| Weight | 525 g / 1.16 lb |
| Controller | ARM Cortex-M4 32-bit STM32F402, 256KB flash |
| Operating environment | -10 C to 50 C |
| Firmware | QMK, with the Keychron Launcher web app for remapping and macros |
| Switch actuation force | No figure on the page we could read on October 26, 2026 |
| Warranty | 12 months; keycaps and palm rests 3 months; K Max series defects replaced as parts |
| Price | $109.99 regular price, read October 26, 2026 |
| Pricing note | $109.99 regular price on keychron.com, priceValidUntil 2030-12-21 in the page product markup (read October 26, 2026) |
What the Keychron K3 Max actually is
The K3 Max is a 75 percent low-profile wireless mechanical keyboard with 84 keys, sold by Keychron at $109.99 as a regular price on its own store, read October 26, 2026.
It is not a sealed office keyboard. The switches lift out, the firmware is QMK, and remapping happens in the Keychron Launcher web app rather than an installed program.
That places it in the same bracket as the other two low-profile sheets in this cluster, but at the low end on price. The NuPhy Air75 V2 sheet is listed from $119.95 and the Logitech sheet starts higher.
For Specs Duel the interesting part is not the typing feel, which nobody here can report. It is that this page prints two specification lists of different lengths, and they do not agree.
Who the Keychron K3 Max sheet is for
This sheet suits a reader who checks numbers before buying rather than after:
- Someone measuring clearance under a monitor arm, because the page gives four height figures and says which include keycaps
- Someone who wants to swap switches later and needs the limit in writing before ordering a set
- Someone comparing runtime honestly, since the page splits backlight off from RGB on
- Someone who writes firmware or flashes boards and wants the controller part number
- A buyer on a hard budget, because this is the cheapest of the three sheets at $109.99
- Someone pairing a keyboard with a colour-accurate panel such as the ASUS ProArt PA279CRV, where desk depth is already tight
- A reader who will take a 12-month warranty in exchange for a lower price
The two polling rate rows that do not match each other
The short list near the top of the page says: 1000 Hz polling rate. No qualifier, no mode split.
The long block further down says something narrower. Polling Rate for 2.4 GHz and wired mode is 1000 Hz. Polling Rate in Bluetooth mode is 90 Hz.
Both strings sat in the same rendered page on October 26, 2026. The second one is the useful one, and it is the one a skim reader will miss.
Ninety hertz is not a defect. It is a normal power trade on Bluetooth Low Energy. But a buyer who plans to work entirely over Bluetooth is choosing a different keyboard than the short list describes.
The practical reading: use the 2.4 GHz receiver when latency matters, and treat Bluetooth as the convenience radio for a second and third device.
Four height figures, and why that matters on a low-profile board
Most keyboard pages print one thickness number and leave the basis unstated. This page prints four and labels each one.
Without keycaps the board is 11 mm at the front and 15 mm at the rear. With keycaps fitted it is 17 mm at the front and 22 mm at the rear.
That is the difference between a figure you can plan a desk around and a figure you have to guess at. The typing angle row, 2.5, 4.2 and 6.5 degrees, tells you which of the three the 22 mm applies to.
Footprint is 306 x 116 mm, or 12.04 x 4.56 inches. Weight is 525 g, which is 1.16 lb.
Across this cluster that makes the Keychron both the smallest footprint and the lightest unit, while still being the tallest at the keycap line.
Battery: 1550 mAh, two runtime rows, one stated caveat
Keychron prints a 1550 mAh rechargeable li-polymer cell, which is the second smallest figure in this cluster.
Runtime is split rather than rounded. Around 73 hours with the backlight off. Around 42 hours with RGB at lowest brightness. The page adds that both are lab figures and may vary by actual use.
That caveat is worth noticing because it is rare. Most pages print one runtime number and let the reader assume it applies to the lighting state they intend to use.
What the page does not give is a charge time, a charging current, or a figure for RGB at full brightness. Those three rows are absent from the rendered page we read on October 26, 2026.
So the honest reading of this battery section is: two states documented, one undocumented, and no refill number at all.
Hot-swap is printed with its limit attached
The page says the switches are hot-swappable, then immediately narrows it in a footnote.
The K3 Max accepts Gateron and Keychron low-profile mechanical switches only. The stated reason is that QMK does not support low-profile optical switches.
That is a specification, not marketing. It changes what a buyer can order alongside the board, and it is printed where a buyer will see it rather than in a support article.
Switch orientation is also named: north-facing. For anyone planning aftermarket keycap sets, north-facing mounts interact with certain profiles, so having the row saved is useful.
What the page never prints is actuation force. No gram figure appears for any switch option, which leaves the typing feel row uncomparable on numbers.
Missing rows of that kind are the normal case rather than the exception. Our Levoit Core 300S sheet and Coway Airmega AP-1512HH sheet each list which rows their makers left out, in a category with far fewer moving parts than a keyboard.
Ease of use: what the 4.0 is built from
The 4.0 reflects what the sheet says about setup, not how typing feels.
In its favour: three connection modes, up to three paired devices, Bluetooth 5.1 named by version, a stated Bluetooth device name, and macOS, Windows and Linux all listed as compatible systems.
Remapping runs through the Keychron Launcher web app, so there is no installer. For a buyer on a locked-down work machine that is a real advantage, and the page states it plainly.
Against it: the two conflicting polling rate rows, and the absence of any charge time. A buyer cannot plan an overnight top-up from this page.
The score is not 4.5 because the short list, which is the list most readers will actually read, is the one that is wrong.
Features: what the 4.6 is built from
This is the highest feature score in the cluster, and it is earned on row count rather than on anything exotic.
The page names the key count, the layout standard, the multimedia key count, the switch brand and orientation, the hot-swap limit, the frame material, the keycap material, the rollover behaviour, the controller part number and flash size.
It also names the backlight option count at 22 types of RGB, the operating environment at -10 C to 50 C, and three typing angles.
That is more rows than the air fryer sheets in our air fryer shortlist manage between them, and those are mains-powered appliances with far less to hide.
The 0.4 held back is for the missing rows: no actuation force, no charge time, no travel distance, no sound or acoustic claim of any kind.
Value: what the 4.5 is built from
At $109.99 the K3 Max is the cheapest sheet here, and it is also the most complete. That combination is unusual enough to carry the score.
The price string appeared twice in the rendered page on October 26, 2026: once as visible text reading Regular price $109.99, and once inside the embedded product markup as a USD figure. Two independent strings, same number.
The markup also carries a priceValidUntil field dated 2030-12-21. That is a schema convention, not a shelf-price commitment, and it should not be read as one.
The build listed at that price on the day we read it, Black with RGB hot-swap and Gateron Low Profile Red, was marked backordered.
So the value case is real but conditional: the cheapest sheet in the cluster, on a configuration that may not ship immediately.
Support: what the 3.4 is built from
This is the lowest support score in the cluster, and the warranty page is the reason.
The stated warranty period is twelve months from delivery to the first end user. Keycaps and palm rests are separately covered for three months only.
For K Max series boards, Keychron states it will replace the defective parts rather than the whole keyboard. The stated reason is that the board is highly customisable and easy to rebuild.
That is a defensible engineering position and a worse outcome for a buyer who does not want to rebuild anything.
Non-defective returns must be requested within seven days of arrival, and the buyer covers return shipping. Replacement parts and service carry 90 days or the remainder of the keyboard warranty, whichever is longer.
Against that, the Logitech sheet in this cluster publishes free returns within thirty days.
What the published rating says, and why twelve is not a sample
The page carried an aggregate rating of 3.92 out of 5 from 12 reviews when we read it on October 26, 2026, attributed in the markup to Judge.me.
Twelve is not a sample. It is a handful. A single unhappy buyer moves that figure by roughly a quarter of a star.
For comparison, and only for comparison of sample size, the NuPhy Air75 V2 page carried 4.6 from 878 reviews on the same day, and the Logitech MX Mechanical Mini page carried 4.46 from 136.
We do not grade either number. Vendor-hosted review widgets sit on the vendor's own page and the vendor controls what appears there.
What the figure is useful for is calibration: when a product page shows a dozen reviews, nothing in that average should change a purchase decision either way.
How this sheet was read
The product page was rendered in a headless browser on October 26, 2026 and the resulting document was searched for strings, not summarised.
That matters here. The long specification block is drawn by a page builder script, so a plain fetch of the page returns the short list and nothing else.
A reader working from the short list alone would have concluded that Keychron publishes no controller, no typing angles, no labelled heights and a flat 1000 Hz polling rate. All four of those conclusions would have been wrong.
The warranty figures came from the separate warranty page on the same domain, read the same day.
Nothing in this review comes from a retailer listing, a search snippet or a summary. Where a row is missing, this review says it could not be read on that date rather than claiming Keychron does not publish it.
Bottom line
The Keychron K3 Max has the best documentation and the lowest price in this low-profile cluster, and the weakest support terms.
Buy it if the sheet is the decision and you will read the long block, not the short one. The labelled heights, the split runtime rows and the named controller are rows almost nobody else prints.
Skip it if your keyboard lives on Bluetooth, where the page itself puts polling at 90 Hz, or if a 12-month parts-only warranty with a seven day return window is not acceptable at this price.
For a different category where makers also split their specification lists in two, the Roborock Q7 Max sheet and the mid-range robot vacuum shortlist show the same habit.
For a duel where two makers measured the same property on two different bases, see ASUS ProArt PA279CRV against BenQ PD2706U, and the BenQ PD2706U sheet behind it.
Buy it if
- The specification sheet is the purchase decision, because this is the longest and most clearly labelled sheet of the three in this cluster
- Desk height matters, since this is the only page here that separates height with and without keycaps, front and rear
- Price is the tiebreaker, at $109.99 against $119.95 and $129.99 for the two rival sheets
- You will rebuild the board later, because hot-swap is a printed row and the switch limit is printed with it
Skip it if
- The keyboard will live on Bluetooth, because the long block puts Bluetooth polling at 90 Hz against 1000 Hz on the dongle
- Battery capacity is the headline row, at 1550 mAh against 4000 mAh on the NuPhy sheet
- A long return window matters, because non-defective returns must be requested within 7 days and the buyer pays shipping
Frequently asked
How long does the Keychron K3 Max battery last?
Keychron publishes two rows, not one: around 73 hours with the backlight off and around 42 hours with RGB at its lowest brightness, from a 1550 mAh li-polymer cell. The page marks both as lab figures that may vary by actual use, read October 26, 2026.
Is the Keychron K3 Max hot-swappable?
Yes, and the page states the limit as well. It accepts Gateron and Keychron low-profile mechanical switches only, because QMK does not support low-profile optical switches. That restriction is printed as a footnote under the specification list, not buried in an FAQ.
What is the Keychron K3 Max polling rate?
It depends which list you read. The short specification list says 1000 Hz with no qualifier. The long block splits it: 1000 Hz on 2.4 GHz and wired, 90 Hz in Bluetooth mode. Both strings were on the same page on October 26, 2026.
How thick is the Keychron K3 Max?
Four figures, each labelled. Without keycaps it is 11 mm at the front and 15 mm at the rear. With keycaps it is 17 mm at the front and 22 mm at the rear. Typing angles are listed as 2.5, 4.2 and 6.5 degrees.
How much does the Keychron K3 Max cost?
$109.99 as the regular price on keychron.com, read October 26, 2026. The same page markup carries a priceValidUntil date of 2030-12-21, which is a schema field rather than a promise about the shelf price.
What does the Keychron warranty cover?
Twelve months from delivery to the first end user, per the warranty page. Keycaps and palm rests get three months. For K Max series boards Keychron states it replaces the defective parts rather than the whole keyboard, because the board is designed to be rebuilt.
Sources
- Keychron K3 Max product page (short specification list, long SPECIFICATION and CONNECTIVITY AND POWER and PHYSICAL UNIT blocks, regular price, embedded product markup) - checked October 26, 2026
- Keychron warranty page (12 month term, 3 month keycap term, K Max parts-only replacement, 7 day return request window, 90 day service term) - checked October 26, 2026
Update history
- October 26, 2026 - First publication. Product page and warranty page both read in a headless render on October 26, 2026.
Visit Keychron K3 Max
We have no affiliate relationship with this vendor. Link goes to the official site.