Custom domains and firm subdomains
A practical product capability for Canadian accounting and bookkeeping practices.
Every firm on SpidNums chooses where its platform lives: an instant subdomain like yourfirm.spidnums.app, available the moment the firm is set up, or the firm's own custom domain so staff and clients sign in at an address the firm controls. Either way the white-label branding carries through, and per-tenant isolation keeps each firm's data separate.
Instant spidnums.app subdomain
Your own domain for staff and clients
Branding carries through either way
Why the sign-in address matters
The URL is part of the brand. A client asked to sign in at an unfamiliar vendor address hesitates; the same client at the firm's own domain does not. The address on invites, engagement-letter emails and bookmarks either reinforces the firm or introduces a stranger.
How domains work in SpidNums
Every firm starts with an instant subdomain — yourfirm.spidnums.app — live the moment the tenant is created, with the firm's branding already applied. No domain purchase or DNS work is needed to launch.
When the firm wants its own address, the platform runs on a custom domain the firm controls. Branding, portal access and engagement-letter links all follow the domain, so staff and clients sign in at the firm's address rather than a vendor's.
How one platform serves many firm domains safely
Each domain resolves to exactly one firm's tenant. Isolation is fail-closed — a signed tenant cookie scopes every request, and anything that cannot be attributed to a tenant is refused rather than defaulted — with file storage namespaced per tenant.
What changes day-to-day
Client-facing links stop needing explanation. Portal invites, engagement-letter emails and the sign-in page all live at an address that matches the firm's letterhead, which shortens the "is this legitimate?" conversation to nothing.
What ships in the module
- Every firm gets an instant subdomain in the form yourfirm.spidnums.app when its tenant is created.
- The platform can run on the firm's own custom domain instead, with branding following the domain.
- Tenancy is fail-closed: a signed tenant cookie scopes each request to one firm, and storage is namespaced per tenant.
- Custom domains are included in the flat USD $1,200 per-firm-per-year plan.
Related features
See it in a workflow
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Frequently asked questions
Do we need to buy a domain before starting?
No. Every firm gets an instant yourfirm.spidnums.app subdomain the moment its workspace is created, with branding already applied, so you can launch and invite clients the same day. A firm can adopt its own custom domain when it is ready.
Can clients use the portal on our domain?
Yes. The client portal, engagement-letter pages and sign-in all follow the firm's domain, whether that is a custom domain or the spidnums.app subdomain. Clients see the firm's address and the firm's branding at every step.
Is a custom domain an extra charge?
No. Custom domains are part of the single SpidNums plan — USD $1,200 per firm per year, everything included. The only cost outside the plan is whatever the firm's domain registrar charges for the domain itself.
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