CampaignStack vs Sumora (2026)

CampaignStack

by CampaignStack

Sumora

by Sumora

Pros

• ✓Auto-send and human review are separate workflow nodes, so each campaign can be set to run unattended or to pause for approval.
• ✓Publishes a first-party MCP server with Bearer key authentication, so external AI agents can drive campaigns without the UI.
• ✓Every feature is included on the paid plan, with credits rather than tiers governing volume, and unused credits roll forward for six months.

Limitations

• ⚠Automated sending runs on a stored LinkedIn session cookie, and the vendor's terms make the customer responsible for not violating LinkedIn's own terms of service.
• ⚠Nine of the sixteen listed integrations are roadmap items and Apollo and HubSpot are in beta, so only LinkedIn, Sales Navigator, Instantly, Gmail, CSV and webhooks are live.
• ⚠The overage rate is published as $0.0035 per credit in the credits section and as $0.035 per credit in the pricing FAQ, a tenfold difference the vendor has not reconciled.

Pros

• ✓Publishes a dated, machine-readable capability declaration listing 27 actions, each marked autonomous, approval-required or not-supported.
• ✓Publishes the per-account daily and weekly send ceilings it enforces, plus automatic mailbox pausing at 0.3 percent complaints, which is rare disclosure in outbound tooling.
• ✓First-party MCP server verified live, with a documented three-step setup naming Claude, ChatGPT, Gemini, Cursor and Windsurf.

Limitations

• ⚠Sumora automates activity on LinkedIn and Instagram, both of which restrict automated messaging in their user agreements, and Sumora's terms place the risk of platform account restrictions on the customer.
• ⚠No independent review evidence exists. The G2 profile is claimed and carries zero reviews, and the company has no Trustpilot or Product Hunt presence.
• ⚠The vendor's llms.txt describes a fully automatic sending mode that its own capability declaration, homepage and plan feature lists all contradict by requiring approval on every send.