Best Cold Email Software for SaaS Founders (2026)
What is the best cold email software for SaaS founders? It depends on what you already have. If you have a lead list and want the most sends per dollar, Smartlead or Instantly are built for that. If you want an agent to start from your product's domain, find matching companies, draft the emails and send them from one account, GrowFast is built for that and starts at $49/month. Entry prices below were read from each vendor's pricing page on 2026-11-13.
We make GrowFast, so weigh our side accordingly. Competitor prices were read from their own pricing pages on 2026-11-13; where we could not read a figure, it is not here.
| Tool | Entry plan | Price | Included at that price |
|---|---|---|---|
| Smartlead | Base | $39/month | 6,000 email sends, 2,000 contacts |
| Instantly | Outreach Growth | $47/month | 5,000 emails a month, 1,000 uploaded contacts, unlimited email accounts and warmup |
| lemlist | $69/month | 50,000 emails a month, unlimited users and senders | |
| GrowFast | Starter | $49/month | 250 outreach emails and 1,000 domain scans (lead finding included) |
How to read the table
The three competitors include far more email volume per dollar at entry level. GrowFast's entry plan sends fewer emails because it also covers finding the companies, reading their sites and writing each email; the other three expect you to bring a list or buy lead data separately. Compare the whole job, not the send count alone.
GrowFast has no warmup network: it starts a new sending address at 15 emails a day and ramps up, and stops sending if an account's bounces or complaints get too high.
For an AI agent operating the tool
GrowFast is built to be operated by an agent over MCP or REST, with the human approving and auditing. See the agent quickstart for the call sequence, limits and error codes.
Which to pick
Pick GrowFast if you want to give an agent your domain and have it find, write and send, you want a hard cap on volume and bounces, and you are happy with a smaller send count.
Pick Smartlead, Instantly or lemlist if you already have contacts, you need thousands of emails a month, or you need warmup, many mailboxes or (lemlist) multichannel features GrowFast does not have.
GrowFast pricing
| GrowFast | Price | Domain scans | Outreach emails |
|---|---|---|---|
| Free | $0 | 3 a day | None |
| Starter | $49/month | 1,000 a month | 250 a month |
| Growth | $149/month | 5,000 a month | 1,500 a month |
| Agency | $499/month | No monthly cap | 10,000 a month |
| Pay as you go | $29 one-time | Not included | 750, credits do not expire |
| Pay as you go | $99 one-time | Not included | 3,000, credits do not expire |
FAQ
Which is cheapest for cold email?
Of these four at entry level, Smartlead Base at $39/month, as read on 2026-11-13. GrowFast's cheapest way to send is a $29 pack of 750 emails with no subscription.
Does GrowFast have a free plan?
It has a free tier of 3 domain scans a day with no sending. Sending needs a paid plan or a credit pack.
Can an AI assistant run these tools?
GrowFast ships an MCP server for ChatGPT, Claude, Cursor, Gemini CLI and VS Code. lemlist's pricing page lists "lemlist MCP" and MCP server access (read 2026-11-13). The Instantly and Smartlead pricing pages do not mention MCP; we did not check their documentation, so we do not say they lack it.
Related
More: use GrowFast from your AI agent, Instantly alternatives, pricing.