Ignition interlock companies and providers compared
Compare nine companies: where each installs, what it publishes as its price, and its Trustpilot rating.
| Company | Listed monthly price | Installation | States | Trustpilot |
|---|---|---|---|---|
 Smart Start | From $59.99 a month | From $150 | 48plus DCmost states | 4.6 of 5best rated, 43,627 reviews |
 Intoxalock | From $54.99 a monthlowest single posted price | Set by each service center | 48 | 4.4 of 580,912 reviews |
 LifeSafer | $50 to $120 a month | $70 to $150 | 47 | 4.6 of 520,439 reviews |
 Dräger (RoadGuard Interlock) | Call for a quoteFirst month free | 32plus DC | 1.7 of 572 reviews | |
 Low Cost Interlock | From $78.76 a month | $100 to $250 | 31 | 2.9 of 54,064 reviews |
 Guardian Interlock | $50 to $120 a month | $70 to $170 | 31 | 3.7 of 5828 reviews |
 Alcohol Detection Systems (ADS) | Call for a quote | 29 | 2.4 of 513 reviews | |
 ALCOLOCK | $60 to $90 a month | $70 to $150 | 24 | 2.3 of 546 reviews |
 Monitech | Call for a quote | Free install | 1North Carolina | 4.2 of 5791 reviews |
- Typical install, per MADD
- $70 to $150
- Typical month, per MADD
- $60 to $80
States and prices come from the location list and the price page of each company; the score comes from its Trustpilot page. MADD's cost ranges. Work out a total for your months.
Which is the best ignition interlock company for you?
Start by checking which businesses install in your state; a state question on the home page lists them. Next, think about the two things that shape both your bill and your week. One is what you pay each month, plus the extra fees. The other is how far the closest install center is, because every service visit sends you back there.
Prices given only by phone
Alcohol Detection Systems, Monitech, Dräger: all three wait until booking to name a monthly price, and none of them list one online. Smart Start, Intoxalock and Low Cost Interlock do publish a monthly "as low as" rate, while LifeSafer, Guardian Interlock and ALCOLOCK post a price range. First learn which plan your state needs, then compare.
Head to head: Smart Start vs LifeSafer, Intoxalock vs LifeSafer
| Compared | LifeSafer | Smart Start | Intoxalock |
|---|---|---|---|
| States | 47 | 48plus DC | 48 |
| Advertised price | $50 to $120 a month | From $59.99 a month | From $54.99 a month |
| Calibration visit | $25 a visit | From $25 a visit | From $20 a visit |
| Trustpilot | 4.6 of 5 | 4.6 of 5 | 4.4 of 5 |
LifeSafer in full · Smart Start in full · Intoxalock in full · Intoxalock vs Smart Start, side by side