A production-grade white-label client portal — with per-client logins, live project status, automated invoicing, Google Drive document access, Gmail automations, and Slack notifications — can be built and run for under $200 per month in tool subscriptions. This is not a simplified version. It is the same stack that agencies use to manage 10 to 30 active clients with zero manual onboarding steps. Here is the exact cost breakdown.
The Monthly Tool Cost Breakdown
Airtable Team plan: $20 per user per month (typically 2 to 3 users for a small agency = $40 to $60). Softr Business plan: $49 per month (supports up to 100 portal users). Make.com Core plan: $9 per month (supports 10,000 operations — sufficient for 20 active clients with monthly billing). Stripe: 2.9% + $0.30 per transaction (no monthly fee). Google Workspace: $12 per user per month for Gmail and Drive access. Total: approximately $120 to $160 per month before Stripe transaction fees, which are a variable cost proportional to revenue collected.
What This Builds
For $120 to $160 per month, the agency gets: automated client onboarding that provisions portal access, Drive folders, and Stripe billing in under 60 seconds; a white-label client portal on a custom domain with per-client data isolation; automated monthly invoicing with payment reminders and receipt confirmation; real-time project status visible to clients 24/7; organized document access per client; and internal Slack notifications for every billing and project event. The build time for the full stack is approximately 48 hours. The full system is demonstrated at omnionlinestrategies.com/client-portal-demo.