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To determine the best car alarm, we looked at the following key features: sensors, one-way versus two-way, installation, engine shut-off, and value-added features. You’ll need to consider sensor style, as you can choose between vibration, pressure, or a combination of the two. If you want confirmation for any buttons pressed beyond a simple LED light, then a two-way car alarm is a better choice. Self-installers should look for car alarms that come with a complete installation kit and ensure that the alarm they want is compatible with their car. And finally, additional features like engine shut-off or remote starting can improve the functionality of your car while also preventing thieves from driving off in your car.
After reviewing all of the above, we nominated the Viper 350 PLUS 3105V 1-Way Car Alarm as our Top Pick. This is a brand that most people recognize as a leader in the car protection niche. More importantly, this particular alarm comes with Viper’s patented FailSafe Kill anti-theft feature that prevents the engine from starting when it detects a break-in. Keep reading to learn more about the rest of our top picks. And, visit our best car battery guide to find a great battery that will keep your car running smoothly.
Award: TOP PICK
WHY WE LIKE IT: A top industry recommended option that features anti-theft FailSafe Kill and an easy installation system makes this model the best car alarm.
Read Full Review: Viper 350 PLUS 3105V 1-Way Car Alarm
For as long as car alarms have been popular, Viper has consistently been one of the most recommended brands in this automotive category. We’ve nominated their 350 Plus 3105V 1-Way Car Alarm as our Top Pick because we think it’s the best car alarm within the one-way design category. We like that this recommendation comes with a complete installation kit that includes all of the wiring you’ll need along with two key fobs, the alarm, and the receiver.
But more importantly, we like the Failsafe Kill anti-theft feature. It ensures that you can prevent the engine from being started and thwart thieves from stealing your car. Plus you’ll like that there’s a visible blue status LED that would-be carjackers can see — encouraging them to look elsewhere. And the six-tone soft-chirp alarm relies on shock sensors that emit sounds in a range of tones depending on the vibration intensity it detects. You can also have a look at the best car battery charger.
Award: HONORABLE MENTION
WHY WE LIKE IT: A smart car alarm with an anti-theft starter feature that relies on dual-zone sensors to prevent false alarms — making it perfect for car owners that don’t want false alarms to annoy their neighbors.
Read Full Review: Avital 3100LX Car Alarm
If you remember car alarms from the 1990s, they were notorious for being ultra-sensitive to the point that thunderstorms or even a stray cat walking too close to your car could set them off. If this has made you shy about installing an aftermarket car alarm, then the Avital 3100LX 3-Channel Keyless Entry Car Alarm will put those fears to rest.
This one-way alarm is designed with a dual-zone impact sensor to detect between minor vibrations versus full impacts or blows to your car. But best of all the Nuisance Prevention Circuitry helps to prevent those annoying false alarms that drive you and your neighbors crazy. You’ll also like the anti-theft starter interrupt feature that prevents hot-wiring attempts. You also get two keyless entry fobs that feature three buttons and an LED light indicator, great for older model cars that are compatible. Once you get your alarm set up, check out the best car stereo
Award: BEST FOR TEENAGERS
WHY WE LIKE IT: An app-based OBD car alarm that notifies you if your car has been moved, if someone is driving aggressively, and monitors your car’s diagnostics — creating an intuitive car monitoring and alarm system that’s ideal for modern times.
Read Full Review: CarLock 2nd Gen Advanced Real Time 3G Car Tracker Review
These days, people want to be able to control everything directly from their smartphone. And that’s why we included the CarLock 2nd Gen Advanced Real Time 3G Car Tracker & Alert System in our guide. This is a great option because it’s a car alarm that notifies you of any activity happening in and around your car. Plus of all the options in our guide, this is by far the easiest one to install since you only need to insert the included receiver into your car’s on-board diagnostic port and pair that with your smartphone.
Although this alarm lacks a starter kill feature, we like that it sends automatic alerts to your smartphone when vibration has been detected, your engine has been started, and when your car is moving. But this is also a great tool for parents of new drivers since you can also monitor multiple cars with this device. This means you can tell if your teen is engaged in distracted driving, driving too fast, or even if they’re engaged in risky behavior like drag racing. And best of all, this car monitoring system also acts as a diagnostic, alerting you when it’s time to take your car in for service. Speaking of practical car accessories, the best car floor mats will help keep your vehicle clean.
Award: LOUDEST SIREN
WHY WE LIKE IT: A responsive two-way car alarm with support for a range of sensor placements and a loud 105-decibel alarm makes this the best car alarm for vandalism.
Read Full Review: Compustar CS7900AS All in One 2 Way Car Alarm Review
What good is a car alarm if no one can hear it? The Compustar CS7900-AS All-in-One 2-Way Car Alarm is perfect for scaring away would-be thieves because it emits a startling 105-decibel alarm siren. For this reason, we think it’s the best car alarm for vandalism. You’ll also note that this is the only two-way car alarm in our guide, making it ideal if you want the peace of mind that comes from a remote system that provides audible or visual confirmation that the command buttons you’ve pressed are properly activated.
We like that this model also features a remote start that can be activated up to 3,000 feet away from your car and an LCD remote. This system also supports a comprehensive sensor detection placement, including in your trunk, hood, and doors. But you can add impact sensors to wherever you need them. And if for some reason you lose the LCD remote, this car alarm comes with a backup one-way remote with an LED light indicator. You may also like the best car subwoofer for your ride.
Award: BEST QUALITY
WHY WE LIKE IT: A comprehensive one-way car alarm that comes complete with remote start and engine disabling functionality — making it the most well rounded one-way model in our guide.
Read Full Review: Crimestopper SP-402 Car Alarm Review
A common issue we found while researching options for our buying guide was that often one-way car alarms force shoppers to choose between the remote start or engine disabling. Usually only one of these features is standard and the other must be added on with a separate purchase. But the Crimestopper SP-402 Car Alarm gives you both of these important features and is also fairly easy to install.
We like that you can remotely start your car as far as 2,300 feet away from the vehicle. While that isn’t as far as our #4 pick, this is still a great feature. This model is designed to support smartphone integration so that you can manage your car’s security from anywhere — although the models must be bought separately. And even though the enhanced functionality beyond remote start and engine shut-off requires separate upgrades, the fact that you can turn this alarm into a two-way alarm is impressive. An alarm takes care of your vehicle security, but for comfort check out the best car seat cushion.
Award: BEST BUDGET
WHY WE LIKE IT: A simple and affordable one-way car alarm that’s easy to install and is compatible with any car that features powerdoor locks.
Read Full Review: InstallGear Car Alarm Review
To be honest, most cars made within the last 20 years drive off the factory assembly line with alarm systems already installed. So, unless you have a faulty factory alarm, you’re probably not looking for a car alarm unless you’re driving an older car. And because of that (depending on the car) you might not want to buy one of the more expensive options in our guide. The InstallGear Car Alarm Security & Keyless Entry System is an all-in-one solution that won’t leave you cash strapped but will still give you the confidence you need when you’re not in your car.
This car alarm is designed to work with any car that offers power-lock doors. So, keep this in mind if you were thinking of using this car alarm for a classic car as it might not be compatible. You’ll like that this one-way alarm comes with the complete installation kit and two key fobs that include an LED indicator light and provide keyless entry and trunk controls. While it lacks remote starting or even engine shut off, this is a great basic car alarm for budget shoppers. Also read about the best car diffuser.
Car alarms are usually a standard feature on most modern cars. But if you have an older car or for some reason need to replace a faulty factory car alarm and you’re no longer in warranty, buying an aftermarket car alarm boasting the best features the market has to offer is going to be important. To create our guide of the best car alarm systems, we considered the following features — sensors, one-way versus two-way, installation, engine shut-off, and value-added features.
The first feature we reviewed was one-way versus two-way alarms. One-way alarms tend to be cheaper options but don’t give you the responsive confirmation that verifies that whatever buttons you pushed have activated a function within your car. Only our Best Quality recommendation is a two-way alarm, with our Top Pick, Honorable Mention, #4, and Best Budget being one-way car alarms. And our #3 model is a smartphone-enabled car alarm and monitoring service.
You’ll also need to consider the sensors. All of our recommendations rely on sensors of some kind, but whereas the one-way models tend to focus on vibration or shock sensors, others like our #3 and Best Quality also support module receivers that can plug into your car’s on-board diagnostic port in the dashboard to create a smartphone link for truly remote management. Also, keep in mind that some systems may require you to purchase and install additional sensors if you’re hoping for a 360-style car alarm security system.
Ease of installation is also important — especially if you’re thinking of installing a car alarm system on your own. By far, our #3 recommendation is the easiest one to install. However, all of our one-way and two-way recommendations come with complete installation kits.
Two key value-added features that many people want in a car alarm include a remote start system and engine shutoff (also known as starter kill). These features aren’t always standard, or one of the two will come standard with an alarm system while the other must be upgraded later for an additional expense. However, our Best Quality recommendation does include both of these features and is also a two-way alarm that can be further upgraded to include smartphone integration.
You can also check out our review of the Python 5706P Responder LC3 SST 2-Way Car Security System.
We don’t buy the best cars or the best electric cars just so they can get stolen. Have you seen the price of the best luxury cars? Protect yourself.
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