Premium contract signing,
on your domain.
Enterprise-grade signing on your domain. Regulatory-style evidence, first-party branding, and multi-party routing for your team and your agents.
For teams that send a lot of contracts, the signing experience is part of the sale. SumoSign sends multi-party envelopes on your own domain, with the audit trail your business demands — and the same workflow runs whether your team or your agents drive it.
Audit exports and compliance controls built for enterprise security review.
2026 — SumoSign
Three steps. One envelope.
Same workflow whether your team or your agent runs it.
No setup wizards. Point your signing subdomain, prepare the envelope with your brand and routing, then track completion and pull evidence — from the dashboard or over the API.
Prepare
Template, brand, route. Handle missing signers, bounced emails, and domain DNS changes without restarting the packet.
Sign
Anywhere, any device, on your domain. The signer never wonders whose product they just entered.
Prove
Evidence bundle, audit trail, API webhook. Everything structured for counsel, not screenshots.
DocuSign feels enterprise.
Your signing experience shouldn't.
Legacy platforms make your client sign in a hallway branded as someone else's product. SumoSign puts your brand on every signing page, email, and link — with multi-party routing, audit-grade evidence, and an API your team and your agents share.
What mid-market teams pay per user, per month, once DocuSign's API access is included. DocuSign Business Pro + API tier, 2025 pricing.
Times your client should wonder whose software they just signed in. Branded sender, branded link, branded signing page, end to end.
Envelope per deal: every signer, parallel or sequential routing, one audit trail, one certificate of completion.
Of signing flows that should carry your brand. Not locked behind a vendor add-on. DocuSign charges extra for custom branding on signing pages.
Branded signing pages
Your logo, your domain, your tone. Client-facing quality that matches what enterprise procurement actually expects.
Custom signing domains
Recipients sign at sign.yourcompany.com. Identity, TLS, and security policy stay fully under your control.
Regulatory-ready audit trail
Append-only log, certificate of completion, and counsel-friendly exports. Structured for legal review, not screenshots.
One workflow for humans and agents
Same envelope, two interfaces: a dashboard for your team and a scoped API for your systems. Agents prepare, route, and watch under explicit credentials; signing stays with authorized people.
What your team and agents can do
Every capability works from the dashboard or the API.
Branded MSA in one flow
Instantiate your template with pre-placed fields, set sequential routing for legal then counterparty, and send from the dashboard or API — on your domain end to end.
“Send our Standard MSA to alex@partner.co — legal signs first, then the client.”
Multi-party with CC routing
Parallel or sequential signers, CC recipients who view but do not sign, and one certificate when everyone is done. Same envelope whether your team or your agent drives it.
“Send this SOW to procurement, legal, and the client — legal and client sign in order.”
Template by name
Save field placement once as a reusable template. Next send, reference the template and the recipient — fields and branding apply automatically.
“Send our Standard NDA to the new vendor using the Acme template.”
Status without dashboard login
Poll envelope status from the API or ask your agent for a structured briefing — pending, overdue, and recently completed — without opening the vendor portal.
“Has Jane signed the NDA yet? Show me everything still waiting on a signature.”
Reminders on your cadence
Configure automatic follow-ups at intervals you choose. Escalating reminders and sender notification when envelopes go overdue.
“Set reminders at 3, 7, and 14 days if they have not signed.”
Evidence when counsel asks
Download the fully executed PDF with certificate of completion and raw audit JSON — structured for review, not screenshots.
“Download the executed agreement and send me the evidence bundle.”
Natural language over the API
Tell your agent what to send. No syntax to memorize.
These are the kinds of requests your team delegates to agents connected via MCP or scoped API keys. Signing stays with authorized people; the trail always shows who acted.
Read the API specSend & route
“Send this NDA to jane@acme.com for signature”
Upload and send with your branding
“Send to alice@co.com, bob@co.com — bob signs first”
Multi-party with routing order
“Use our Standard MSA template for the new client”
Instantiate a saved template
Track & manage
“Has Jane signed the NDA yet?”
Check status of any envelope
“Brief me on all pending signatures”
Pending, overdue, and completed overview
“Download the fully executed agreement”
Signed PDF plus certificate
Configure
“Set reminders at 3, 7, and 14 days”
Automatic follow-up cadence
“Void the envelope — deal fell through”
Cancel in progress with audit entry
“Replace the signer — wrong email on the envelope”
Revoke token and reroute
Premium signing is part of the sale.
Your buyer sees the link before they see the contract.
Your million-dollar client does not want budget-basement signing software. Enterprise buyers expect a signing experience that looks as serious as the contract itself. SumoSign is the premium option for teams that send a lot of contracts and refuse to route their clients through a hallway branded as someone else's product.
The honest comparison
We are not trying to replace DocuSign for Fortune 500 procurement. We are building for teams that send a lot of contracts and care how the signing link looks.
| Feature | SumoSign | DocuSign | SendSign |
|---|---|---|---|
| Custom signing domain (your DNS) | Add-on | Add-on | |
| Multi-party routing | |||
| Branded signing pages | Add-on | Add-on | |
| MCP / agent API | Add-on | ||
| Reusable templates | |||
| Webhooks | |||
| Open source / self-host | |||
| Cowork-native plugin | |||
| Flat predictable pricing | |||
| Audit trail + certificate |
Your agents run the workflow, not the signature.
Explicit credentials. Full audit trail. No ambiguity.
Every dashboard action is available through scoped API keys, so your agents can prepare, route, send, and watch envelopes under explicit machine credentials. Same envelope, same audit trail, same evidence bundle. Signing stays with people or explicitly authorized identities; the trail always shows who acted, human or machine.
Explore the APIEncryption in transit
TLS on every connection — API calls, signing ceremonies, webhook deliveries.
Document hashing
SHA-256 hash in the completion certificate. Tamper detection is built into the evidence bundle.
Append-only audit trail
Every action logged with timestamp, IP address, and user agent. Actor type always recorded: human, API key, recipient, or system.
Tenant isolation
Organization-scoped data paths and API keys. Queries enforce tenant boundaries at the database layer.
ESIGN / UETA alignment
Signer intent capture, consent records, and audit-grade evidence structured for US enforceability.
Evidence export
Certificate of completion plus raw audit JSON — downloadable for counsel and compliance review.
Everything you need. Nothing you don't.
Full-featured e-signatures with an API-first architecture designed for automation and branded B2B workflows.
Custom signing domains
Recipients sign at sign.yourcompany.com. Your DNS, your TLS, your brand in the email, link, and address bar.
Multi-party routing
Parallel or sequential signers, CC viewers, and one audit trail across the whole envelope.
REST API + MCP
Every dashboard action available over scoped credentials. Works with your stack, your agents, and MCP-compatible clients.
Reusable templates
Field placement, signer roles, and brand settings saved once — instantiate on every send.
Webhooks
Real-time notifications for sent, viewed, signed, completed, and voided. Integrate with any workflow.
Completion certificate
Tamper-evident record with document hash, signer details, timestamps, and consent capture.
PDF flattening
Signatures embedded directly in the PDF. The signed file stands alone — no special viewer required.
Bulk send
Same document to many recipients. Each gets an independent signing link and tracking.
Your questions, clearly answered.
SumoSign follows established e-sign frameworks (for example ESIGN and eIDAS-style evidence practices) used in regulated industries. Enforceability always depends on jurisdiction and document type; we concentrate on defensible signer identity, captured intent, and tamper-evident records your counsel can rely on.
Least-privilege roles, encryption in transit, scoped API and agent credentials, and append-only audit trails are table stakes for enterprise signing. Controls exist to support regulatory review and procurement questionnaires, not checkbox marketing.
Expect a direct cutover plan: map templates, recreate branding and domains, parallel-send a cohort, then shift volume. The goal is first-party signing without the enterprise procurement detour.
Teams that control DNS typically provision quickly, including verification. If IT batches changes, schedule the window. The steps themselves are documented.
Agents draft from templates, place fields, route envelopes, poll status, call webhooks, and archive outcomes. Signing stays with people, or with explicitly authorized machine identities where the legal model is defined; agents do not impersonate signers. Delegation is never ambiguous in the trail: you always see who acted, under which credential, and when.
Published tiers cover most teams; Enterprise covers procurement, security review, custom limits, and dedicated rollout. Start from the pricing page and open a conversation when you need SSO, data residency, or volume commitments.
Signing should make your company look serious.
Roll out enterprise-grade multi-party envelopes, custom domains, and a shared API for your team and your agents — on infrastructure your security team can approve, without inheriting another vendor's brand.