Yes.
You need a simple CRM
Why
You named the four real players in personal CRM, so you don't need a longer list — you need to pick. Your requirements (birthday reminders, family/kids notes, LinkedIn sync, lightweight) genuinely require software; a spreadsheet won't ping you when someone's kid's birthday is tomorrow. But Clay and Folk are overkill — Clay is a B2B enrichment tool that pivoted positioning, and Folk is built for deal pipelines you don't have. That leaves Dex or Monica.
What you actually need
- Dex ($12/mo or $120/yr) — purpose-built for exactly your use case. LinkedIn sync via browser extension is its killer feature, plus "keep in touch" reminders (set someone to "every 3 months" and it nags you). This is the one to pick if LinkedIn sync matters most.
- Monica (free self-hosted, or $9/mo cloud) — open-source, stronger on the "personal notes" side (kids' names, gift ideas, conversation logs, relationship trees). Weaker on social sync. Pick this if you care more about depth of notes than LinkedIn auto-update.
- A habit — Sunday 20-minute relationship review — every Sunday evening, open the tool, look at who's surfaced for follow-up that week, and send 3-5 messages. Without this habit, neither tool will save you. The software surfaces the name; you still have to type the message.
Do this today
Go to getdex.com, start the 7-day free trial, install the Chrome extension, and sync your LinkedIn connections (Settings → Integrations → LinkedIn). Then pick 20 people who actually matter to you, set each to a "keep in touch" cadence (monthly / quarterly / yearly), and add one note per person about the last thing you talked about. By next week Dex will tell you exactly who you're overdue with.
What to ignore
Skip Clay — it's a B2B prospecting and enrichment tool, not a relationship tool, and pricing starts at $149/mo. Skip Folk — it's a team sales CRM with a nice UI, and you're not running sales. Ignore anyone suggesting HubSpot Free "because it's free" — it's built around deal pipelines and will feel like wearing a suit to call your cousin.
What doing nothing costs you
You'll keep losing the small details — the kid's name, the job change, the surgery they mentioned — that are the entire reason relationships compound. The cost isn't financial; it's that in five years your network is shallower than it should be despite all the events you attended.
When to revisit this
When you've used Dex consistently for 90 days and either outgrow it (unlikely) or stop opening it (more likely — at which point the answer is "no tool, just a recurring calendar event").