Intoxalock vs Smart Start: Which IID Is Better?
The two largest IID providers head-to-head. Here's how they compare on cost, convenience, and customer experience.
Our Pick
Intoxalock
Wins on service locations, cost, and device size. Smart Start is better for users who prioritize app experience.
At a Glance
Intoxalock
Winner- Largest service network
- Often free installation
- Smaller, more discreet device
Smart Start
Runner-up- Best mobile app experience
- Quick appointment scheduling
- Reliable device performance
Feature-by-Feature Comparison
| Feature | Intoxalock | Smart Start |
|---|---|---|
| Service Locations | 4,500+ | 2,200+ |
| State Coverage | All 50 states | All 50 states |
| Monthly Cost | $70-90 | $75-95 |
| Installation | $0-125 | $0-200 |
| Calibration | Usually included | Usually included |
| Mobile App | Good | Excellent |
| Customer Support | 24/7 | 24/7 |
| Device Size | Compact | Standard |
| Camera Option | Available | Available |
Service Locations
Intoxalock has roughly twice as many service locations as Smart Start, making it easier to find a convenient spot for installation and monthly calibrations.
Intoxalock: 4,500+ locations
Service centers include auto shops, tire shops, and dedicated Intoxalock locations. Most users can find a location within 15 minutes of home.
Smart Start: 2,200+ locations
Still a solid network, but users in rural areas may have longer drives for calibration appointments.
Tip: Check available locations in your area before choosing. A more expensive provider with a convenient location may be worth it to save time.
Cost Comparison
| Cost Type | Intoxalock | Smart Start |
|---|---|---|
| Installation | $0-125 | $0-200 |
| Monthly Lease | $70-90 | $75-95 |
| Calibration | Included | Included |
| Removal | $50-100 | $50-100 |
| 12-Month Estimate | $990-1,280 | $1,050-1,390 |
Winner: Intoxalock - Typically $60-110 less per year. Intoxalock also more frequently offers free installation promotions.
Mobile App Experience
Both providers offer mobile apps for managing appointments, viewing test history, and receiving notifications. Smart Start's app is generally considered superior.
Intoxalock App
- View upcoming calibration appointments
- Find service locations
- Some users report bugs and crashes
Smart Start App
- Clean, intuitive interface
- Easy appointment scheduling
- Test history and device status
- Higher app store ratings
Customer Service
Both providers offer 24/7 customer support, which is essential if you have issues starting your car early in the morning or late at night.
Intoxalock
Mixed reviews on customer service. Some users report long hold times and billing disputes, while others praise their support team.
Smart Start
Generally positive customer service reviews. Users appreciate responsive support and quick issue resolution.
The Bottom Line
Choose Intoxalock if:
- • You want the most service location options
- • Cost is a priority (typically $5-10 less per month)
- • You want a more compact, discreet device
Choose Smart Start if:
- • App experience is important to you
- • There's a Smart Start location more convenient for you
- • You value consistently positive customer service
Other Comparisons
Sources
Comparison based on provider websites, customer reviews, and industry analysis as of January 8, 2026.
Disclosure: This page contains affiliate links. We may earn a commission if you install an interlock device through our partners, at no additional cost to you.