Best AI SDR tools
'AI SDR' covers a wide range of automation. Compared here on what each tool specifically does, and whether a human reviews its work before it goes out.
Instantly wins on transparency about human review: it explicitly names a Human-in-the-Loop mode for its Reply Agent, versus an Autopilot mode, and lets you choose. Close wins instead for a team that wants an AI agent bundled into the CRM itself rather than a separate outreach-only tool.
The short answer
- Close includes an AI agent called Chloe on every tier starting at $9/user/month (Solo, annual), positioned around automating prospecting work inside the CRM, per close.com/pricing.
- Instantly's Reply Agent offers an explicit Human-in-the-Loop mode, where a person approves AI-drafted replies before they send, and a separate Autopilot mode that acts without review except for flagged uncertain cases, per instantly.ai/ai-agents/reply-agent.
- Instantly's AI Reply Agent is included on its Scale bundle plan ($175-194/month), alongside a 450M+ B2B contact database, per instantly.ai/pricing.
AI SDR tools compared
| Tool | Starting price | What it automates | Human review mode | Best for | Not for |
|---|---|---|---|---|---|
| Close (Chloe) | $9/user/mo (Solo, annual) | Prospecting work inside the CRM | Not detailed on the pricing page | A team that wants an AI agent built into its CRM from day one | A team wanting a dedicated, standalone outreach automation tool |
| Instantly (Reply Agent) | $175-194/mo (Scale bundle) | Drafting and sending replies to cold email campaigns | Named 'Human-in-the-Loop' mode, or Autopilot | A team that wants explicit control over whether AI replies alone or waits for approval | A team wanting AI SDR work beyond email replies, like calls or LinkedIn |
Figures checked on close.com/pricing and instantly.ai/pricing and instantly.ai/ai-agents/reply-agent, September 2026.
What each one actually covers
Close (Chloe)
Bundled into every Close plan rather than sold separately, which means a team already using Close for its CRM and calling gets an AI agent without a second subscription. The specific scope of what Chloe automates versus what stays manual is best confirmed directly with Close, since the pricing page names the feature without a detailed breakdown. Not for: a team that wants a dedicated outreach-focused AI SDR product outside a full CRM.
Instantly (Reply Agent)
The more specifically scoped of the two: it handles replies within Instantly's cold-email product, and gives you an explicit choice between a mode that drafts and waits for your approval and one that acts on its own. That specificity is a genuine strength for a team that cares about exactly how much autonomy the AI has. Not for: a team wanting AI SDR coverage across calling or LinkedIn as well as email.
When none of these is the answer
A team with a low volume of leads, a handful a week, doesn't need an AI SDR tool. A human doing the prospecting and replying directly is both cheaper and more accurate at that volume than configuring and monitoring an AI agent.
It's also worth being skeptical of "AI SDR" as a category label generally. The tools that use it cover a wide range of actual automation, from drafting a reply for review to running full prospecting workflows, and the label alone doesn't tell you which one you're buying.
Questions
- Can an AI SDR fully replace a human SDR?
- Not for the whole job. Both tools compared here automate specific pieces, prospecting research or reply handling, rather than the full range of judgment an SDR applies across a territory: reading a prospect's tone, adjusting a pitch, and deciding when to escalate.
- What does Close's Chloe agent actually do?
- Chloe ships on every Close tier as a built-in AI agent, positioned as automating prospecting work; the specifics of what it handles versus what a human still does are worth confirming directly with Close before assuming full autonomy.
- What does Instantly's Reply Agent do?
- It handles replies to cold email campaigns, and explicitly offers a Human-in-the-Loop mode where a person approves AI-drafted replies before they send, versus an Autopilot mode where the agent acts on its own and only flags uncertain cases, per instantly.ai's own product page.
- Is 'AI SDR' just a rebrand of a chatbot or automation feature?
- Sometimes, so it's worth checking what specifically the tool automates rather than trusting the label. The category ranges from narrow reply-drafting assistance to broader prospecting research, and 'AI SDR' gets applied to both.