If you're looking for a single service to synchronize and manage contacts from multiple sources, Clay is a strong contender. It's an integrated relationship management system that automatically syncs and updates contacts in real-time. Clay can import contacts from email, calendar, Twitter, LinkedIn, Facebook and iMessage, and can also track notes and reminders. It also offers smart prompts to help you stay in touch and nurture relationships, and is geared for professionals like executives, recruiters, creatives and freelancers.
Another option is Nylas, a unified API platform that lets you connect email, calendar and contact services to your own apps. Nylas offers APIs for synchronizing, sending and receiving messages, calendar and event management, and synchronizing and managing contact information. It's designed for developers, so it should be easy to integrate and run reliably with 99.9% uptime. It supports many programming languages and offers a free tier for up to 5 accounts, so it's a good option for a variety of CRM and SaaS apps.
For a more general-purpose relationship management service, Cloze combines contact management with email, phone calls, text messages, meetings, documents, notes and tasks. It uses AI to help you organize and prompt you, and it integrates with many other apps and services. Cloze has powerful search and multiple pricing tiers for different needs, including team support and deeper integration.
Last, Surfe is a LinkedIn prospecting tool that automates contact capture and synchronization. It integrates with popular CRMs like HubSpot and Salesforce, and offers features like AI-powered message templates and job change detection. Surfe is designed to streamline prospecting processes, cutting manual data entry and increasing sales productivity.