Benchmark

How often are we right?

50 real buyer questions with answers taken from manufacturer pages, not from our own data. What matters most: we never want to say "it fits" when it doesn't.

Wrong "it fits" answers0of 50

Correct overall98%49 of 50

Correct when we gave a yes or no100%41 of 41

Said "can't confirm" on out-of-scope products8 / 8instead of guessing

Method

42 questions about products in our coverage (6 per original category, half "fits" and half "doesn't"), written as a shopper would type them, plus 8 about products we don't cover, where the right answer is "can't confirm".
Each expected answer was read from the manufacturer's own page (linked below) on 2026-10-13, independently of our dataset.
Scored on the decision: "fits" (supported or conditional), "doesn't fit", or "can't confirm" (insufficient evidence). Run on 2026-10-13 against the released catalog; it runs again on every release.

Read this before quoting the number

We used this set while improving the engine (it found three data errors we then fixed: a Nikon battery, Apple Watch band groups and lens adapters). That makes it a development set, so the overall score is optimistic. The number we hold ourselves to is wrong "it fits" answers, which has been zero throughout. A held-out set, written by someone who hasn't seen the engine, comes next, starting with PC building.

Every question

#	Category	Question	Manufacturer says	We said	Why
b01	computers	Lenovo ThinkPad T14 Gen 3 (Intel) + Kingston FURY Impact 16GB DDR5-5600 SODIMM KF556S40IB-16	Doesn't fit	Doesn't fit	The T14 Gen 3 Intel has one DDR4-3200 SO-DIMM slot, and a DDR5 module won't fit or work in a DDR4 slot. source
b02	computers	ThinkPad T14 Gen 3 Intel + Kingston ValueRAM 32GB DDR4-3200 SODIMM KVR32S22D8/32	Fits	Fits	Lenovo lists one DDR4-3200 SO-DIMM slot that takes up to 32GB (8/16GB soldered + 32GB SO-DIMM, up to 48GB total). source
b03	computers	ASUS ROG Ally (2023) RC71L + Kingston NV3 1TB PCIe 4.0 NVMe M.2 2280 SSD SNV3S/1000G	Doesn't fit	Doesn't fit	ASUS says the original ROG Ally takes compact M.2 2230 drives (only Ally X / Xbox Ally models take 2280), so a longer 2280 drive is not a fit for the original Ally. source
b04	computers	ASUS ROG Ally RC71L + WD_BLACK SN770M 1TB M.2 2230 NVMe SSD WDBDNH0010BBK	Fits	Fits	The SN770M is an M.2 2230 PCIe 4.0 NVMe drive and WD/SanDisk names the ASUS ROG Ally as a compatible handheld. source
b05	computers	Lenovo ThinkPad X1 Carbon Gen 11 + Kingston FURY Impact 32GB DDR5-5600 SODIMM KF556S40IB-32	Doesn't fit	Doesn't fit	Lenovo states the X1 Carbon Gen 11 memory is soldered to the system board with no slots and is not upgradable. source
b06	computers	Sony PlayStation 5 Slim CFI-2015 + Kingston FURY Renegade 1TB PCIe 4.0 NVMe M.2 SSD with heatsink SFYRSK/1000G	Fits	Fits	PS5 takes PCIe Gen4 x4 M.2 NVMe 2230-22110 drives with a heatsink up to 11.25mm tall; this 2280 Gen4 drive (7,300MB/s, 10.5mm) qualifies and Kingston markets it as PS5-ready. source
b07	cameras	Sony a7 IV ILCE-7M4 + Canon RF24-105mm F4 L IS USM	Doesn't fit	Doesn't fit	The a7 IV has a Sony E-mount and this is a Canon RF-mount lens, so it does not mount on the camera. source
b08	cameras	Canon EOS R7 + Canon Battery Pack LP-E6NH	Fits	Fits	Canon lists the LP-E6NH as the R7's supplied battery (LP-E6N and LP-E6 also usable). source
b09	cameras	Canon EOS R10 + Canon Battery Pack LP-E6NH	Doesn't fit	Doesn't fit	The EOS R10 uses the smaller LP-E17 battery, not the LP-E6 family. source
b10	cameras	Sony a6400 ILCE-6400 (APS-C) + Sony FE 50mm F1.8 SEL50F18F	Fits	Fits	It is a Sony E-mount full-frame lens; Sony lists its 75mm equivalent focal length on APS-C, so it works on the APS-C E-mount a6400 with a crop. source
b11	cameras	Sony Alpha 7 IV ILCE-7M4 + SanDisk 128GB Extreme PRO CFexpress Type B card	Doesn't fit	Doesn't fit	The a7 IV slot 1 takes SD or CFexpress Type A and slot 2 takes SD only; CFexpress Type B is a different, larger card. source
b12	cameras	Nikon Z6III + Nikon EN-EL15c Rechargeable Li-ion Battery	Fits	Fits	Nikon lists one EN-EL15c as the Z6III battery (EN-EL15b and EN-EL15a also usable with fewer shots). source
b13	mobile	iPhone 15 + Anker 313 Wireless Charger (Pad), Qi	Fits	Fits	Apple lists Qi wireless charging up to 7.5W for iPhone 15, so a standard Qi pad charges it (at up to 7.5W). source
b14	mobile	iPhone 14 + Apple 240W USB-C Charge Cable (2 m), USB-C to USB-C	Doesn't fit	Doesn't fit	iPhone 14 has a Lightning connector, so a USB-C-to-USB-C cable can't plug into it (it ships with a USB-C to Lightning cable). source
b15	mobile	Apple Watch Series 10 46mm + Apple 42mm Sport Band S/M (Burgundy) MJUX4AM/A	Doesn't fit	Doesn't fit	Apple lists the current 42mm band for 38/40/41/42mm cases only; a 46mm case needs a 44/45/46mm band. source
b16	mobile	Apple Watch Ultra 2 (49mm) + Apple 46mm Sport Band M/L	Fits	Fits	Apple says bands for 44, 45 or 46mm cases are compatible with 49mm cases (recommended for casual, everyday use on Ultra). source
b17	mobile	Google Pixel Watch 2 + Google Pixel Watch Active Band 45mm	Doesn't fit	Doesn't fit	Pixel Watch 2 comes only in 41mm and Google says 45mm accessories only work with the 45mm Pixel Watch 3, 4 and 5. source
b18	mobile	Google Pixel Watch 2 + Google Pixel Watch Active Band 41mm	Fits	Fits	Google Store lists the Active Band as compatible with Google Pixel Watch 2 (41 mm). source
b19	power-tools	DeWalt DCD800B 20V MAX XR drill/driver + DeWalt DCB606 FLEXVOLT 20V/60V MAX 6Ah battery	Fits	Fits	DeWalt states FLEXVOLT batteries are compatible with DeWalt 20V MAX power tools. source
b20	power-tools	DeWalt DCS578B FLEXVOLT 60V MAX 7-1/4 in. circular saw + DeWalt DCB205 20V MAX XR 5Ah battery	Doesn't fit	Doesn't fit	DeWalt says the DCS578B is compatible with FLEXVOLT 20V/60V MAX batteries; the DCB205 is a plain 20V MAX pack that can't supply 60V. source
b21	power-tools	Milwaukee 2904-20 M18 FUEL 1/2 in. hammer drill + Milwaukee 48-11-2440 M12 REDLITHIUM XC4.0 battery	Doesn't fit	Doesn't fit	The 48-11-2440 is an M12 pack that powers M12 tools; the 2904-20 is an M18 tool, a different battery platform. source
b22	power-tools	Makita XPH14Z 18V LXT hammer driver-drill + Makita BL1850B 18V LXT 5.0Ah battery	Fits	Fits	Makita lists the XPH14Z battery as 18V LXT Lithium-Ion, and the BL1850B is an 18V LXT battery. source
b23	power-tools	Makita GFD01Z 40V max XGT drill + Makita BL1850B 18V LXT 5.0Ah battery	Doesn't fit	Doesn't fit	Makita says the BL1850B is compatible only with Makita 18V tools, and the GFD01Z is a 40V max XGT tool that takes XGT batteries. source
b24	power-tools	Bosch GSR18V-1330CN PROFACTOR 18V drill/driver + Bosch GBA18V80 CORE18V 8Ah battery	Fits	Fits	Bosch lists the GBA18V60, GBA18V80 and GBA18V120 as recommended battery packs for this tool. source
b25	printers	HP DeskJet 2755e All-in-One + HP 67XL High Yield Black ink 3YM57AN	Fits	Fits	HP lists the HP 67XL Black (3YM57AN) as a replacement cartridge for the DeskJet 2755e. source
b26	printers	HP DeskJet 2755e (bought in the US) + HP 305 Black Original Ink Cartridge 3YM61AE	Doesn't fit	Doesn't fit	HP lists only HP 67-family cartridges for the US DeskJet 2755e, and HP's 305 compatibility list does not include the 2755e. source
b27	printers	Epson EcoTank ET-2850 + Epson 502 (T502) Black ink bottle T502120-S	Fits	Fits	Epson lists the EcoTank ET-2850 in the 502 ink bottle's 'Works With' list. source
b28	printers	Epson EcoTank ET-2800 + Epson 502 (T502) Black ink bottle T502120-S	Doesn't fit	Doesn't fit	The ET-2800 uses Epson 522 bottles; Epson's 502 'Works With' list does not include the ET-2800 (it is listed under 522). source
b29	printers	Brother HL-L2350DW + Brother TN760 High-yield Black Toner	Fits	Fits	Brother lists the HL-L2350DW as a compatible printer for TN760. source
b30	printers	Brother HL-L2460DW + Brother TN760 High-yield Black Toner	Doesn't fit	Doesn't fit	Brother lists TN830/TN830XL toner (and DR830 drum) for the HL-L2460DW; TN760 is for the older HL-L2350DW family and doesn't list it. source
b31	appliances	GE refrigerator whose current filter is a GE XWF + GE XWFE refrigerator water filter	Fits	Fits	GE says XWFE replaces XWF and is compatible with all refrigerators using XWF. source
b32	appliances	Samsung RS27T5200SR side-by-side refrigerator + Samsung HAF-CIN water filter (DA29-00020B)	Doesn't fit	Doesn't fit	Samsung's spec sheet lists HAF-QIN as this model's water filter; HAF-CIN is a different cartridge. source
b33	appliances	Samsung RF28HMEDBSR 4-door French door refrigerator + Samsung HAF-QIN water filter (DA97-17376B)	Doesn't fit	Doesn't fit	Samsung's spec sheet lists HAF-CIN as this model's water filter, not HAF-QIN. source
b34	appliances	LG LSXS26336V side-by-side refrigerator + LG LT800P water filter	Fits	Fits	LG's spec sheet lists 'Water Filtration System LT800P' for this model. source
b35	appliances	LG LSXS26336V side-by-side refrigerator + LG LT1000P water filter	Doesn't fit	Can't confirm	LG specifies the LT800P for this model; the LT1000P is a different LG cartridge. source
b36	appliances	Whirlpool WRS325SDHZ 36-inch side-by-side refrigerator + everydrop Ice & Water Filter 1 EDR1RXD1 (purple)	Fits	Fits	Whirlpool lists everydrop Filter 1 (purple) under compatible accessories for the WRS325SDHZ. source
b37	smart-home	Amazon Echo Dot (5th Gen) - my only smart home device + Aqara Door and Window Sensor (Zigbee)	Doesn't fit	Doesn't fit	Aqara says an Aqara hub is required for this sensor, and an Echo Dot is not an Aqara hub. source
b38	smart-home	Apple HomePod mini + Eve Energy smart plug (Matter, Thread)	Fits	Fits	Eve Energy needs a Matter controller with a Thread border router and works with Apple Home; Apple names HomePod mini as a Thread-enabled home hub for Matter and Thread accessories. source
b39	smart-home	Google Nest Hub (2nd gen) + Kasa Smart Wi-Fi Plug Slim KP125M (Matter)	Fits	Fits	The KP125M is a Matter-certified Wi-Fi plug and Google lists Nest Hub (2nd gen) as a Matter hub for Google Home. source
b40	smart-home	Apple HomePod mini (Apple Home) + Kasa Smart Wi-Fi Plug Lite HS103	Doesn't fit	Doesn't fit	TP-Link lists the HS103 as working with Alexa, Google Assistant and Cortana only; it has no HomeKit or Matter support for Apple Home. source
b41	smart-home	Apple HomePod mini (Apple Home) + August Wi-Fi Smart Lock (4th Generation)	Fits	Fits	August lists 'Works with Siri + HomeKit' for the Wi-Fi Smart Lock and says it needs no extra bridge. source
b42	smart-home	Table lamp with a standard US E26 medium screw socket + Philips Hue White and Color Ambiance GU10 smart spotlight	Doesn't fit	Doesn't fit	Philips lists this bulb's fitting as GU10 (twist-lock pins), which can't go into an E26 screw socket. source
b43	out-of-scope	2019 Honda Civic LX sedan + Bosch ICON 26A 26-inch wiper blade	Can't confirm	Can't confirm	Car parts are not in any of our datasets, so we can't confirm fit.
b44	out-of-scope	Trek FX 3 Disc hybrid bike (2022) + Shimano CN-HG601 11-speed chain	Can't confirm	Can't confirm	Bike drivetrain parts are not covered by our data.
b45	out-of-scope	Toro 22 in. Recycler self-propelled gas mower + Toro 22-inch Recycler replacement mower blade	Can't confirm	Can't confirm	Lawn mower blades are not covered; blade fit depends on deck and part number we have no data for.
b46	out-of-scope	Garmin Forerunner 265 + 22mm QuickFit silicone watch band	Can't confirm	Can't confirm	Garmin watches and bands are not in our mobile dataset.
b47	out-of-scope	Weber Genesis E-325s gas grill + Weber Flavorizer Bars for Genesis 300 series	Can't confirm	Can't confirm	Grills and grill parts are not covered by our data.
b48	out-of-scope	Nintendo Switch OLED model HEG-001 + SanDisk 512GB microSDXC card for Nintendo Switch	Can't confirm	Can't confirm	Nintendo consoles are not in our computers dataset.
b49	out-of-scope	Keurig K-Elite coffee maker + Keurig My K-Cup Universal Reusable Coffee Filter	Can't confirm	Can't confirm	Coffee makers and their accessories are not covered by our data.
b50	out-of-scope	Kobalt 24V MAX brushless drill/driver + Kobalt 24V MAX 4.0Ah battery	Can't confirm	Can't confirm	Kobalt is not a battery platform we list, so we can't confirm it.