Which is better for a locksmith doing keys all day?

The KM100. It is built around key generation, cloning and OBD key learning, and it is light enough to carry to every job. The IM508S Pro adds diagnostics you may not need on a key-only call.

Which is better for a repair shop?

The IM508S Pro. All-system diagnostics, 40+ service resets and XP400 Pro chip and ECU functions cover more of a general repair workflow than the KM100 does.

Which has better vehicle coverage?

They differ by task. The KM100 claims smart key replacement on 700+ models and OBD key learning on about 90% of cars. The IM508S Pro covers diagnostics across most makes and calls out VW/Audi 4th and 5th IMMO key learning.

Is the IM508S Pro worth stepping up to?

Yes if you need diagnostics, service resets or ECU and chip work. If keys and fobs are the whole job, the KM100 does that with less weight and a simpler workflow.

Which is easier to carry and use on site?

The KM100. At 0.8 lb with a 5.5-inch screen and a 4950 mAh battery, it is made for mobile work. The IM508S Pro is a 16 lb kit with the XP400 Pro.

The IM508S Pro has the stronger hardware: RK3566, 4GB RAM and Android 11 against the KM100's PX30, 2GB RAM and Android 9. The KM100 still generates Autel universal keys in about 60 seconds.

Autel MaxiIM IM508S PRO vs Autel MaxiIM KM100

The IM508S Pro is the fuller workshop tool: all-system diagnostics, 40+ service resets and XP400 Pro chip and ECU work, in a heavier 16 lb kit. The KM100 is a pocket key tool: 0.8 lb, 5.5-inch screen, 60-second key generation and OBD key learning on most cars. Buy the IM508S Pro if you diagnose and program across many brands; buy the KM100 if keys and fobs are the job. Owners rate the KM100 highly for ease and portability; the IM508S Pro wins on depth, not on convenience.

Choose the IM508S Pro if you need full-system diagnostics, service resets and chip, ECU and infrared key work in one tablet.
Choose the KM100 if you mainly cut and program keys and fobs and want a light tool that fits in a pocket.

Prices

Autel MaxiIM IM508S PRO: $1,231.88 at obdprice (last seen Nov 11)
Autel MaxiIM KM100: $394.68 at Auteldealer.com (last seen Nov 11)
Difference: the Autel MaxiIM KM100 is $837.20 cheaper than the Autel MaxiIM IM508S PRO at the latest prices (Nov 11)

	Autel MaxiIM IM508S PRO	Autel MaxiIM KM100
Main job	All-system diagnostics plus IMMO and key programming	Key and fob programming first, with IMMO coding
Key generation	Chip programming via the bundled XP400 Pro	Autel universal keys generated in about 60 seconds
Vehicle coverage	Broad multi-brand diagnostics; VW/Audi 4th and 5th IMMO key learning called out	700+ models for smart key replacement; OBD key learning on about 90% of cars
Hardware	Rockchip RK3566, 4GB RAM, 64GB storage, Android 11, dual-band Wi-Fi	Rockchip PX30, 2GB RAM, 64GB storage, Android 9, 5.5-inch 1280x720 screen
Portability	16 lb kit with the XP400 Pro	0.8 lb, 200 x 89 x 22 mm, 4950 mAh battery
Service functions	40+ resets including oil, EPB, SAS, BMS and DPF	Not a general diagnostic or service-reset tool
Extras	ECU read/write, MC9S12 encryption, IC card, Mercedes infrared key, remote frequency detection	8 MP camera, ambient light sensor, V200 VCI, key renewal for 36 makes
Owner feedback	Fewer owner reports; judged on diagnostic depth	4.8 out of 5 from 69 ratings; praised for ease of use

Spec	Autel MaxiIM IM508S PRO	Autel MaxiIM KM100
Vehicle type	Car	Car, SUV, Truck, Van
Features	Code Reader	Easy to assemble, Portable, Lightweight
Weight	16 lb	352.7g (0.8 lb)
Automotive diagnostic tool type	Professional Scanners	—
Brand	Autel	—
Compatible cars	VW/ Audi 4th 5th IMMO Key Learning	—
Vehicle fitment type	Specific	—
Vehicle make	VW	—
Vehicle year	1996	—
Model	Autel MaxiIM IM508S PRO	—
Accessories	XP400PRO	—
Items included	1IM508S, 1XP400PRO	—

Spec	Autel MaxiIM IM508S PRO	Autel MaxiIM KM100
Has written warranty	No	—
Series	IM508S	—
Power type	Battery	—
Extra battery included	N	—
Batteries incl	Y	—
Output	buzzer	—
Style	—	KM100
color pattern	—	Black, Red
power source	—	Rechargeable, Battery-powered
Dimensions (WxHxD)	—

Autel MaxiIM IM508S PRO vs Autel MaxiIM KM100

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Autel MaxiIM IM508S PRO vs Autel MaxiIM KM100

Prices

Autel MaxiIM KM100

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