What domain should I pick?

io - because of how much it has been used in the recent years, it kind of grew some credibility I'd say. People now know it.

But if I was you I would look for alternatives to still use the one and most popular domain you can use...c o m

I'd lean toward the .io since I've noticed people will often mistype/misremember and enter ".com" when it's a.co and once someone buys that .com domain it may be an issue. This is an addition to the fact that people may accidentally send emails to you@yourwebsite.com instead of you@yourwebsite.co (I get emails from people who clearly meant to send it to the .co version of one of my .com sites.)

I do think .co is just as professional sounding as .io to be honest, so if you're willing to roll the dice with typo's, than all power to you. :)

(I suppose people misremembering will be a risk regardless of the extension, if it's not a .com).

Chhers!

You should not use a mailto link for your website email address.

You can hide your email address behind a fun scratch card -- scratch to reveal the email address. It makes sure it's a human and not a spam bot. veilmail.io

I associate .io with small tools - think https://keywordtool.io/

.co means company or corporation and is associated with a larger-sized company. It's pretty neutral and serious.

.app feels more on the "fun" side of things, similar to .io

If you're going for a real professional vibe, .co is the best.

If you’re based in Australia then au otherwise co

For a B2B SaaS application targeting medium to larger sized businesses, I would recommend going with a .io domain. The .io extension is commonly associated with tech and startup companies, making it a good fit for a SaaS product. It also has a strong presence in the tech community, which can lend credibility to your brand. Additionally, .io domains are often perceived as more modern and innovative, which can align well with the nature of a SaaS product.

For B2B SaaS, I would ask you additional questions.

Is your SaaS a data, analytics, dev-tool, hardware-related startup?
If yes, then use .io domain

If no, is your B2B SaaS just a web app? Or also downloadable on the Google Play Store, ioS App Store?
If also downloadable, then .app domain

Otherwise, then use .co domain and contact the domain owner of the one you actually want using who is search or registar enquiry (if set to privacy). And enquire about domain purchase, if amount too high, negotiate down, arrange a payment plan with them, or make it your future major purchase.

I’m sure this is an outlier opinion, but does the .com have a buy it now price? Depending on your that, budget, traction etc I would consider trying to acquire your brand match .com esp for b2b (cet par .com still signals establishment and trust). I recently changed my opinion on TLD extensions and have become a bit of a .com maxi. Tim Ferriss interview with Andrew Rossner was the turning point.

In short: doesn't matter that much, just choose one and build it.
If you can, get all others and redirect them to the main domain

.com not being used is a plus for you to build your brand first.
I personally would never recommend using .co without the .com domain: I don't like the idea of people confusing them and not finding me – or worse not even knowing about .co

.io is rather tech-focussed. If that's your target audience, it would work. If not, .app is a safer bet.

For b2b then .co

.io

Who's into dropshipping business?