A personal CRM built for someone with two hundred relationships is a different product from one built for someone with eight thousand. If you're networking on purpose, four things decide the outcome, and three of them never appear in a feature comparison.
How much of your network it'll hold. Every keep-in-touch tool here meters this, and the numbers are lower than people expect. Dex syncs 2,500 LinkedIn connections on Premium, 7,500 on Professional, 15,000 on Enterprise. Mesh stops at 1,000 on its free plan. If you've been working for a decade, one Gmail account alone can exceed both. Find the ceiling before you find the features.
Where the records come from. Networking generates people faster than anyone files them, so the only durable answer is a tool that files them for you. That splits the field three ways: scanning what you collect in person (Covve), syncing a capped slice of LinkedIn and your inbox (Dex, Mesh, folk, Nimble), or reading the whole history of who you've emailed and met (Happenstance, Streak inside Gmail).
Whether you can ask it a question. Nearly all of these give you filters over fields you filled in. Networking questions arrive in the opposite shape. You don't know the person, you know the description: "someone at a Series B fintech", "someone who has hired a first sales rep", "who could introduce me at Ramp". A tag-based filter cannot answer a question you never tagged for.
Whether anyone else can join. The fastest way to enlarge a network is to combine it with someone else. Almost nothing in this category is built for that at an individual price: pooling usually lives on a team tier. Happenstance groups are free and unlimited, and the largest make 380,000+ people searchable for everyone in them.