You can get some domain names for as little as $1/year for niche TLDs, and if you're willing to splurge a bit, you can get more generic ones for $8. It not only looks more professional, it simplifies administration, and makes it far easier to isolate the domains later. You can also extend the branding to email addresses. If they're just pet projects, it's no big deal, but if you're intending to monetize them or want them to become durable brands, the sooner you get them a custom domain, the better.
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You can get some domain names for as little as $1/year for niche TLDs, and if you're willing to splurge a bit, you can get more generic ones for $8. It not only looks more professional, it simplifies administration, and makes it far easier to isolate the domains later. You can also extend the branding to email addresses. If they're just pet projects, it's no big deal, but if you're intending to monetize them or want them to become durable brands, the sooner you get them a custom domain, the better.