I would suggest the Vello ShutterBoss II Remote Switch with Digital Timer for Canon with 2.5mm Sub-Mini Connection. Honestly its sooo much more reliable than that app! I'm pretty new to timelapses but it works amazing for my 90D. Just be super CAREFUL when plugging it in cuz you dont wanna strain the jack. It has the full timer functions you need too. gl!

Seconding the recommendation above about that Vello timer! Honestly, I'm pretty new to landscapes too, and I basically learned the hard way that you get what you pay for. I bought a random $5 knockoff first and the cable was so thin it frayed after two trips... highkey a waste of money. Plus, I was always scared it would short out my port or something because the fit was so loose. If you want something budget-friendly but a bit more versatile than a basic wire, I'd look at the Pixel TW-283/E3 Wireless Shutter Release for Canon. It's usually way cheaper than the name brand stuff and gives you both wireless freedom and a full intervalometer for those timelapses you mentioned. Here is why it's a solid value imo:
- It lets you step away from the tripod so you dont accidentally bump it while the shutter is open (I do this way too often lol).
- It uses standard AAA batteries which are way easier to find in a pinch than those weird button cells.
- The range is actually decent, so you can sit in your car where it's warm while the camera does its thing. Just a heads up though—be super gentle with the 2.5mm jack. If you trip over the cord or it snags on something, you could damage the camera's internal port which is a pricey fix. I usually loop the cable around my tripod head once just to be safe. It works well for my setup, but idk, maybe sticking to a simple wired one is "safer" if you're worried about wireless interference. gl!

In my experience, Neewer is solid: - Uses 2.5mm jack
- Good for long exposures But tbh, the cables feel thin. Just *be careful* so you dont break 'em. gl!

I just saw this thread and wanted to jump in because I went through a whole trial-and-error phase with remotes when I started doing star trails. I actually started with those basic wired ones, but after a few failed shoots due to cable strain and connector oxidation in humid night air, I moved to RF (Radio Frequency) triggers. The main reason I prefer RF over something like the Canon app or IR remotes is the 2.4GHz signal stability. It doesnt need line-of-sight and wont drain your phone battery. I eventually settled on the Pixel TW-283 Wireless Shutter Release Control for my 80D and its been a tank. It uses FSK modulation which basically prevents cross-interference if youre shooting near other photographers. Technically speaking, the build quality on the receiver is much better than the cheap clones. It handles single, continuous, bulb, and has a full delay/intervalometer built in. Plus, it runs on AAA batteries for both pieces, which is a lifesaver since you can find those anywhere if they die mid-shoot. Honestly, having that 80-meter range is great for wildlife too, not just landscapes. If you want reliability, going wireless RF is the way to go.

I saw this thread earlier but just getting to it now... honestly, I am a bit of a stickler for build quality after I actually snapped a cheap connector off inside my 80D port a while back. It was a total nightmare to fish out with tweezers. If you just want something that wont fail you during a cold sunrise, I would suggest the Canon RS-60E3 Remote Switch. It is a basic wired shutter release, but the cable is much thicker than the third-party stuff. ngl, it lacks the timer, but for simple long exposures it is basically tank-like. If you really need the intervalometer for those timelapses, you might want to consider the Pixel TW-283 Wireless Timer Remote Control. I switched to this for my night photography because the wireless feature means you arent touching the camera at all, which is huge for avoiding shake. Just be careful though, the receiver sits on the hot shoe and the cable can dangle. I always make sure to wrap the cord around my tripod head once so there is no strain on that 2.5mm jack. Those ports are kinda delicate on the 90D, so you really dont want any weight pulling on them. Tbh, the Pixel feels a bit more robust than the Neewer stuff I have tried in the past.