Bike computer or app on phone?

I see this question come up all the time in person and online: 

"I've got an app on my phone, why would I want a bike computer?"

It's a fair question in 2026. The mobile apps like Ride with GPS, Strava, Komoot, even Google Maps and others can do an excellent job of guiding you on a route and tracking your experience. And so they do at least an 'ok' job of it at their free tier. For an occasional rider, that is probably a sensible answer.

But for a more regular or all-weather rider, I'd suggest that a dedicated GPS computer (head unit) is a better choice. Why? Let's compare:

App on Phone	GPS Bike Computer
Apps are a very low-cost entry into navigation and tracking that work and are simple to use (we'll ignore the cost of the phone for the moment). Many are even quite usable at their free tier.	Dedicated GPS computers are an extra expense in an already gear-heavy, spendy sport.
Apps on a mounted phone may leave your phone quite exposed to weather and risk. For those who mount the phone to be seen, there is a non-zero risk of damaging a very expensive device either from it coming loose or being involved in some accidental contact (drops, crashes etc.). While most modern phones are relatively weather resistant, I wouldn't want to ride with one exposed in the rain. Even more common is that they can overheat and shut down. Exposed directly to the sun, it is very easy to reach that point.	GPS computers are weatherproof and rugged. They can keep running in rain, sun and even snow. Most won't care much about being dropped (unless directly on a rock with the screen)
Apps on a phone can be hard to see in direct sunlight on some phones.	GPS computers have a variety of screens with varying legibility. Most use some sort of transflective LCD that uses sunlight to illuminate the panel in the day and adds backlight for dark use. These are not as nice as modern phone screens but more likely to work in all day and weather conditions. They may not be equal depending on mounting angle. As LCDs they tend to have an optimal angle and be difficult to read outside of that.
Apps on a phone (mounted or pocket) put a meaningful drain on your battery. In your pocket, just tracking and audibly prompting turns, it's not too bad. Out and visible, it's pretty significant, particularly if you look at it often. Also, do you want your emergency contact device at risk of being non-functional when you need it? Or just running out of nav at a bad time. There are ways of managing this risk though for common duration rides.	GPS computers are usually parsimonious with the battery. In the Garmin world, the 1040 is rated for 35 hours per charge in max use mode; over 70 is power-saving mode. IOW, easy multi-day ride without charging. Other models (like it's successor the 1050) have meaningfully less but still all-day-and-then-some territory. Units like the 1040 solar or the Coros Dura can go on and on and on.
Apps on a phone may or may not get sensor data you want. If you wear a smartwatch, you'll probably get HR data from it, which is simple. If you need a separate sensor, you need to make sure it is Bluetooth (traditionally most are ANT+). If you want cadence, power, shifting etc, those sensors may or may not offer Bluetooth signals an app can use.	GPS computers are designed with these sensors in mind. They can connect to all common sensors (HR, cadence, wheel speed, power, gear indicators, tire pressure, Radar (more on this later)...) using Bluetooth or ANT+
Apps on a phone usually must be run with conservative screen timeouts to allow the battery to last long enough. This hinders easy, visual access to information while riding	GPS computers can continuously display information because of their power management. You can see the map all the time or see the data you care about (or both). For some, this is very important. For others, not at all. Personally, I like to be able to see the map as I approach choices, whether to clarify the instruction or to realize, with my eyes, that there may be a better option
Apps on a phone need to be accessible either by mounting them somewhere or being easily accessed from a bag, pocket, etc and/or audible	GPS computers (even the bigger ones) are usually more compact on the bike than a modern phone mounted. That's irrelevant if you keep your phone in your pocket but might matter otherwise.
Apps on a phone naturally have great connectivity to download maps and routes, to share activities etc. Personally, I use these apps as my route planners and then have to get the routes into the Garmin ecosystem. If you're using the app, it's just there.	GPS computers today nearly all have connectivity via a connected phone or over WiFi when available. But connectivity implementation quality varies a lot. Some work like magic. For example, Hammerhead has a tool to drop a route URL in it on your browser and it just appears on the device in a few moments. Others rely on back-end sync and tagging a route in a certain way, which creates a copy in the computer's world which you may or may not need to actively select and which will appear eventually after a sync, perhaps. Some older models would accept a SIM card for direct mobile connection, but that seems to be abandoned in current-generation devices.

Well, if I want a bike computer, which one should I get?

This is even harder. Among most cyclists I know, Garmin Edge products are the default. Everybody knows them, features are robust, and they are readily available. Personally, I use an Edge 1040 (non-solar) as my primary computer and have an older Hammerhead Karoo (the 2nd gen) that I use sometimes or lend to friends. I'm not going to try to do full reviews as I haven't experienced them all, but I can offer some thoughts that might guide your search of others' reviews for details.

Computer	Pro	Con
Garmin Edge x50 series	The latest and greatest from Garmin These have very bright, high-resolution screens. But this comes at the cost of lower (but still good) battery life Rich ecosystem of special 'data fields' (show special info from other apps or sensors) and third-party connectivity A bell. Silly but handy as it actually sounds like a bell. Along with this is better sound. It can be melodic rather than just BEEP Nearly every third-party sensor will work with a Garmin product, whether natively or through a plug-in data field or on-device app Nearly every online service can connect to the Garmin ecosystem in one way or another It is the x50 series because it is available with the same basic software and features in different sizes. The 1050 is the big one with touchscreen and buttons. The 850 is smaller with touchscreen and buttons. The 550 is like the 850 but with a button interface only.	Borderline stupid expensive. It is out over a year now and we're starting to see meaningful discounts though Battery life suffers due to screen quality Connectivity is great in theory and buggy in practice Upgraded UX that looks nicer but I haven't used to see if it actually works better. Some proprietary bad behavior in the last year or two with connectivity and devices. Some restrictions on data access to other tools online and the latest generation of radar is now locked to Garmin only for the new features. To me, this damages (but does not destroy) the ecosystem benefits.
Garmin Edge x40 series	One generation old. Available new and easily found used The screen is similarly sized to the x50, but different technology. Lower power but not as bright and visible. Highest battery life of the current Garmin units in each size Nearly every third-party sensor will work with a Garmin product whether natively or through a plug-in data field or on-device app Same basic family series except the additional option of the 1040 Solar that captures sunlight to extend battery life. It still burns faster than it gains in full sunshine but can extend run time significantly	Still pretty pricey. Used or on sale can be a better value Same, maybe worse connectivity. Audible signals are a limited combination of beeps with little differentiation in perceived urgency. It gets annoying sometimes. The x50 is much nicer this way For the first time, Garmin back-ported most of the new features from the x50 series into the x40. Obviously not the ones that require hardware (bell, visual effects that only work on the newer screen). As they don't have a tradition of doing this, I wouldn't expect future enhancements on the x50 to be backported too, but so far they have.
Hammerhead Karoo	Lovely screen both visually and in terms of touch responsiveness Ability to add additional Android apps (this helped when Shimano got mad at SRAM and forced them not to connect to Di2) Great online (web app) interface for managing your routes, activities and the device.  Easy and reliable to load routes.	Battery life is not impressive. Fine for normal rides but problematic for centuries or touring
Coros Dura	The superstar in battery life. Many reports of 'normal' users not charging for weeks or months and Ultra riders completing events without charging. It's a combination of being power-thrifty and the built-in solar panel that appears to produce a greater percentage of 'burn' power than the Garmin version. Simple interface. Primarily a big scroll wheel on the side and a simple screen display.	Early reviews had a lot of concerns about bugginess. Later reports suggest that Coros did a very good job of responding and correcting most of them. More recent reviews make almost no mention of software problems. So take note of when things were written/recorded when reading/watching Simple user interface. Some miss the more sophisticated configuration options in others No real ecosystem outside of the Coros fitness world.
Wahoo	Probably the second most common product in the market. As such, lots of user support and understanding Generally a bit less expensive than the corresponding Garmin products App-forward configuration. It relies heavily on a paired phone app to configure. This is usually reported as a plus for ease of use. (FWIW, Garmin has tried to follow in recent releases to mixed results) Most users report it is a 'just right' experience in terms of simplicity vs richness	Less ecosystem support than Garmin. Connectivity from third parties seems comparable. But things like special sensor compatibility is more limited (I have some pressure sensors that the developer only supports Garmin and Hammerhead because of their app infrastructure)
Others like iGSport etc.	There are several other brands of bike computer out, mostly Chinese brands. Reports indicate that some of the new releases are quite competitive with respect to the above brands on a feature level alone and extremely favorable on a price/performance level.	While these can theoretically be a good buy, particularly for those 'on the fence' vs an app, check the feature sets carefully before buying. Make sure it does what you want. Particularly make sure it connects to the apps that you want it to.