Which is better for a full-service shop?

The IM508S, because it adds all-system diagnostics and 28+ service resets on top of key work. The KM100 covers keys only.

Is the IM508S worth the extra money?

Only if you need diagnostics. If you just make keys, the KM100 does that for $397 at ABKeys versus $795 at Keyless City as of November 5, 2026.

Which is easier to carry on jobs?

The KM100. It weighs 0.8 lb and uses a Bluetooth VCI, while the IM508S is a 7-inch tablet with a wired VCI.

Does the KM100 do All Keys Lost?

It handles IMMO key programming and universal key generation for many makes, but the IM508S adds PIN/CS reading and EEPROM/MCU work for tougher lost-key jobs.

Which has better key programming coverage?

Both cover BMW, VW, Toyota, Honda and GM. The KM100 states smart key replacement for 700+ vehicles; the IM508S states 150+ makes for diagnostics.

How long do software updates last?

The IM508S includes one year of free updates. The KM100 listing shows conflicting update terms, so confirm with the store before you buy.

Autel Automotive Diagnostic Tool IM508S vs Autel MaxiIM KM100 IMMO & Key Fob Programming Tool

Buy the KM100 if your main job is making and programming keys. It costs $397 at ABKeys as of November 5, about half the IM508S at $795 at Keyless City. Buy the IM508S if you also need full all-system diagnostics and service resets on top of key work.

Today the Autel MaxiIM KM100 IMMO & Key Fob Programming Tool costs $398.00 less at its best price.

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