Assembly vs. Fastio

Assembly is the AI-powered platform for professional service firms, from accounting and bookkeeping practices to agencies and consultants. It combines a branded client portal, a simple CRM, and an AI app builder that lets your firm add any software it needs without a dev team. Clients get one branded place for messages, files, forms, tasks, contracts and e-signatures, and invoices they can pay online. Your team runs on a CRM with automated reminders and an AI Assistant that knows full client context. When your firm needs something the portal doesn’t do yet, describe it.

Fastio: The AI-first workspace where people and AI agents work on the same files Fastio gives teams one place to store, share, and work on content, with AI built into every workspace. It's a modern alternative to Box, Dropbox, and Google Drive for teams that use AI agents alongside people. ✓ Built-in AI: Every file is indexed automatically, so you can search by meaning, ask questions across a workspace, and get answers that cite the source files ✓ AI agents as teammates: Connect Claude or your own agents through MCP, the REST API, or the CLI, each with its own scoped permissions and a full