Compare/Head to head

Salesforge vs Underfive

Same facts, side by side: starting price, free tier, MCP, API and what each one is actually built for.

Starting price

Salesforge

$40/mo Free trial

AI cold email plus LinkedIn. Pro is $40/mo billed monthly, with two months free on annual billing; 14-day trial. Agent Frank is $499/mo billed quarterly.

Where Salesforge fits

  • Outbound teams that want AI copy plus LinkedIn
  • Clay-connected GTM shops
  • Buyers who will take a 14-day trial
  • Agencies comparing Instantly plus a writer

Underfive

$60/mo Free trial

Underfive puts every cold email and LinkedIn reply in one inbox and has AI agents answer them in under five minutes and book the meeting. It suits agencies and recruiting firms running outbound for clients who lose meetings to slow replies. Plans start at $60 a month for 200 credits, and new accounts get 50 free credits with no card.

Where Underfive fits

  • Agencies booking meetings for several clients
  • Recruiters who miss replies outside working hours
  • Teams running both cold email and LinkedIn outreach
  • Teams that want AI drafts approved in Slack

At a glance

DetailSalesforgeUnderfive
Starting price$40/mo$60/mo
Free tier–No–No
Free trialYesYes
MCP server–No✓Yes
Public API–No✓Yes
Listed underLead generation, LinkedIn, OutreachOutreach, Workflow automation

Where they pull apart

Salesforge

Stands out: Agent-written sequences across email and LinkedIn, with a public $40 rung and a 14-day trial (HubSpot, Salesforce, Clay, Slack named).

Watch out: The entry plan allows one LinkedIn sender. Unlimited senders are $80/mo billed monthly. The AI agent is a $499 add, not the entry seat.

Not the right fit for

  • Teams that refuse AI-written outbound
  • Enterprises on Outreach
  • People who only need a $29 sequencer

Underfive

Stands out: Pricing follows the replies its agents handle rather than seats or mailboxes, so a small desk can start at $60 a month where Master Inbox starts at $599. It also ships its own hosted MCP server, so an AI assistant like Claude can read threads and approve or send replies.

Watch out: Credits run out faster on high volume or chatty threads, since every reply read costs half a credit and every draft costs one. The API, webhooks and MCP server start on the $150 Growth plan, and the entry plan has a single workspace.

Not the right fit for

  • Teams that want flat pricing regardless of volume
  • Senders who want no automated replies at all
  • Users who need API access on the entry plan

Pros and cons

Salesforge

  • $40 start plus a 14-day trial
  • Email and LinkedIn in one AI sequencer
  • Agent Frank is an explicit add-on, not hidden
  • Unlimited senders are $80/mo billed monthly
  • Agent is $499/mo quarterly
  • Not Outreach-grade enterprise

Underfive

  • Low entry price, priced per reply
  • Email and LinkedIn in one inbox
  • Hosted MCP server and API
  • Credits can run out at volume
  • API and MCP from $150 a month
  • One workspace on the entry plan

What each one costs

Salesforge

$40/mo

Pro is $40 a month billed monthly and Growth is $80 a month billed monthly; annual billing gives two months free. Agent Frank, the AI SDR, is $499 a month billed quarterly or annually. A 14-day free trial is included. Cost scales with active contacts, email volume, LinkedIn social action credits and AI personalization credits. Confirm current terms on the vendor site.

Checked 4 Nov 2026

Underfive

$60/mo

Underfive prices on credits used by its agents, not on seats or mailboxes: reading a reply costs 0.5 credits and drafting a response costs 1 credit. Professional is $60 a month for 200 credits and one workspace. Growth is $150 a month for 500 credits and five workspaces and adds the API, webhooks and MCP server. Business is $250 a month for 1,000 credits and ten workspaces. Agency is $500 a month for 2,500 credits, unlimited workspaces and custom integrations. Paying annually saves 20%, custom plans are available above 2,500 credits, and a managed service is offered where the vendor's team works the inbox. New accounts start with 50 free credits and no credit card. Confirm current terms on the vendor site.

Checked 4 Nov 2026

Common questions

Is Salesforge cheaper than Underfive?
Salesforge starts lower, at $40/mo against $60/mo for Underfive. That is the entry plan on each side, so the real number depends on seats and the tier you land on.
Can you try Salesforge or Underfive for free?
Neither carries a free tier on our listing. Salesforge offers a free trial. Underfive offers a free trial.
Does Salesforge or Underfive have an MCP server?
Underfive ships a first party MCP server, so an AI assistant can work the product directly.

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Editorial listings, never paid rankings. Prices checked 4 Nov 2026. Confirm current terms on the vendor site. Spot an error?