How many apps does the free plan allow, and what does upgrading to Pro actually unlock?

Free lets you connect 3 apps of your choice from the 60+, forever, no account. Pro's main unlock is unlimited apps, so if you're juggling more than three (say two WhatsApps, Slack, Gmail and Telegram), that's when you'd upgrade. Pro also adds the deeper inbox features on top. Pricing is $4.99/mo or $59.88/yr, and there's a one-time Lifetime option ($129, usually $199) if you never want to think about billing again. Honestly, a lot of people are fine on free, three apps covers the classic 'WhatsApp + work chat + email' combo.

Free = 3 apps. Pro = unlimited apps + the extra inbox tools. That's the whole decision. If three slots covers your daily apps, free is genuinely all you need.