Which is better for a locksmith doing all-keys-lost jobs?

The IM508S. It reads PIN/CS for all keys lost and adds IMMO ECU reset and EEPROM/MCU read/write. The KM100 does not support all-keys-lost on Toyota and Ford.

Is the IM508S worth the extra $397?

Yes if you also do diagnostics. The IM508S adds all-system scans and 28+ resets the KM100 lacks. If you only clone keys, the KM100 covers that for less.

Which one is easier to carry?

The KM100. It weighs 352.7 g and uses a wireless Bluetooth VCI, so there is no cable to the OBD port. The IM508S is a 7-inch tablet with a wired VCI.

Do both program Autel IKEY smart keys?

Yes. The KM100 is built around IKEY generation for 700+ vehicles. The IM508S programs keys through its XP200 programmer and Smart Mode.

Which has better software support?

The IM508S includes free updates for one year and a 1-year warranty. The KM100 has no stated update window, and users report gaps in its brand menu.

Which one lasts longer?

Both use a 5,000 mAh battery. The IM508S has 4 GB RAM versus 2 GB, which handles heavier diagnostic software better over time.

Autel MaxiIM KM100 Key Programmer vs Autel Automotive Diagnostic Tool IM508S

Buy the KM100 if you only need to generate and clone keys on a budget. Buy the IM508S if you also need full diagnostics, resets and all-keys-lost work. As of November 5, 2026, the KM100 is $398.00 at Locksmith Keyless and the IM508S is $795.00 at Keyless City, so the IM508S costs about twice as much.

Today the Autel MaxiIM KM100 Key Programmer costs $397.00 less at its best price.

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