Best client portal software: an honest comparison
Vellum editorial · Updated September 2026
The best client portal software depends on one decision most buyers miss: do you want a portal that stores your client work, or one that organizes the tools you already use? Storage-heavy portals (all-in-one suites) suit teams starting from zero. Zero-storage overlays like Vellum suit anyone already running on Drive, Slack, WhatsApp, and Stripe — which is most freelancers, agencies, and law firms.
What client portal software actually does
A client portal gives your clients one place to find everything about their engagement: files, messages, project status, and invoices. Without one, clients chase you across email threads and chat apps asking "where's the file?" — and every scattered answer makes a well-run practice look disorganized.
Nearly every product in this category promises the same outcome. The real difference is architectural: where your clients' documents live, and who is responsible for them.
The two camps: storage-heavy vs zero-storage
Storage-heavy portals are all-in-one platforms. You upload (or recreate) your files, conversations, and invoicing inside their system, and clients log in there. Well-known examples in this camp include suites like Copilot, SuiteDash, Moxo, and Huddle — capable products that genuinely replace parts of your stack.
Zero-storage overlays take the opposite approach. Instead of moving your work, the portal holds only pointers — a Drive folder link, a Slack or WhatsApp chat link, a Stripe invoice link — and presents them behind one branded client link. Vellum is built this way. Your files never leave your existing accounts.
| What matters | Storage-heavy portals | Zero-storage overlay (Vellum) |
|---|---|---|
| Your files | Copied into the portal's storage | Stay in Drive/Dropbox — the portal stores only a link |
| Migration effort | Days to weeks of moving content | Minutes per client — map each link once |
| Team re-training | Everyone learns a new system | None — the underlying tools don't change |
| Data liability | A new vendor holds client documents | Nothing new to disclose in a breach assessment |
| Permissions | Rebuilt inside the portal | Your existing Drive/Workspace permissions stay the source of truth |
| If you cancel | Export and migrate everything out | Walk away — your work was never inside |
How to choose: a five-question checklist
- Where do your files live today? If the answer is Google Drive or Dropbox and it works, a portal that asks you to move them is a step backwards.
- Who else touches client data? Every system that stores client documents is another entry in your data-processing inventory — and, for law firms, potentially another call with your malpractice insurer.
- How fast do you need to be live? All-in-one suites pay off over months. An overlay rolls out per client in minutes.
- What does the client actually see? A login to someone else's software, or a clean, branded hub on your own domain?
- What's the exit cost? The more a portal stores, the more it costs to leave. Zero-storage tools have near-zero lock-in.
When each type wins
Choose a storage-heavy portal if you're starting from nothing — no Drive structure, no chat channels, no invoicing tool — and you want one system to grow into. The consolidation is worth the migration when there's nothing to migrate.
Choose a zero-storage overlay if you already work in Drive, Slack or WhatsApp, and Stripe or PayPal — and what you actually need is for clients to experience that work as one organized whole. That describes most established freelancers, agencies, and law firms.
Where Vellum fits
Full disclosure: Vellum is our product, and it's a zero-storage overlay. You map each client's Drive folder, chat link, and invoice link once; Vellum issues a single branded Hub link — on your own subdomain — with project status on top. It never stores the underlying files or conversations, and every link issued or revoked is written to an audit log.
Solo is $29/month for up to 15 clients; Agency is $49/month with unlimited clients, team seats, white-labeling, and status automation. Both include a 7-day trial.
This guide is published by Vellum. Descriptions of other products reflect their general, publicly known approach at the time of writing; evaluate current features and pricing on each vendor's site before deciding.