Ignition Interlock Provider Reviews (2026)

Independent reviews of the major ignition interlock providers — real costs, device usability, location coverage, and the complaint themes each is known for. We verify pricing with providers and may earn a referral fee when you contact one.

Most service locations and 24/7 support — our current best-overall pick. Watch for upsells.

Long track record and international coverage; the blow-hum-blow pattern trips some new users.

Often the lowest quotes; fewer locations in rural areas.

Guardian Interlock

Simple device and straightforward billing; smaller footprint.

RoadGuard (Dräger)

Medical-grade hardware reputation; available through partner locations.

Low advertised pricing; confirm state approval before choosing.

Comparing two providers head-to-head? See our interlock comparisons → or check which providers are approved in your state →