What each kind of tool covers
Almost every product here calls itself an AI SDR. They are not the same thing. The difference is which parts of the job you are still doing yourself after you buy.
| Category | Find | Qualify | Research | Write | Send | Follow up | Replies | Call | Book |
|---|---|---|---|---|---|---|---|---|---|
| Lead databases | Yes | No | Partly | No | No | No | No | No | No |
| Sequencers | No | No | No | No | Yes | Yes | Partly | No | No |
| AI writing add-ons | No | No | No | Partly | Yes | Yes | Partly | No | No |
| Voice and dialer tools | No | No | No | No | No | No | No | Yes | Partly |
| Full AI SDR agents | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
The five categories of AI SDR tool
Lead databases
Sells you access to contact records: companies, people, emails, phone numbers and company data.
Finding a person is not knowing they should be contacted. The list arrives. Deciding, writing, sending and following up are still yours.
Sequencers and cold email platforms
Sends a sequence to a list on a schedule, paces the volume, and tracks opens and replies.
They automate sending, not thinking. You still write the messages, and every prospect gets the same template with a first name swapped in.
AI writing add-ons
Adds a generate button to a sequencer so it can draft a first email from a LinkedIn profile.
The model gets whatever is in the row and is asked to sound convincing. That is exactly how you get a confident sentence about a problem the company does not have.
AI voice and dialer tools
Places outbound calls with an AI voice, or connects a human rep faster.
A second product, a second bill, and a second copy of your prospects that does not know what your emails already said to the same person.
Full AI SDR agents
Runs the whole pre-close motion: sourcing, qualifying, research, writing, sending, follow-ups, replies, calls and booking.
The category is young and the label is used loosely. Gartner expects agents to outnumber sellers 10 to 1 by 2028, but fewer than 40% of sellers to say they helped. The questions below tell a real one from a sequencer wearing the name.
A quick testAsk a vendor what their product does with a lead whose job title is missing. A sequencer sends anyway. A writing add-on invents something plausible. A real AI SDR tells you the lead is not ready and names what is missing.
Seven questions to ask before you buy
Demos are built to look good. These questions separate products that run the motion from products that run the sending.
Does it decide who to contact, or only how to reach them?
A real AI SDR checks each account against your ideal customer before it spends anything on enrichment. A sequencer takes whatever list you give it. Ask to see the qualification rules, and whether you can read and edit them or they are a hidden score.
What does it do when it does not know enough?
The most important question, and almost nobody asks it. A tool that always writes will sometimes write something false. Ask what happens to a lead with a missing job title or an unverified email: does it write anyway, or stop and tell you what is missing?
Are email and calling one system or two?
If voice is a separate product, the caller does not know what the emails said, a reply on one channel does not stop the other, and you reconcile two sets of usage on two invoices. Also ask how calling stays legal: in the US, AI voices fall under the TCPA, so calls need prior consent and do-not-call checks.
Who approves a message before it sends?
Full autonomy sounds like the selling point and is usually the risk. You want review as the default, with autopilot something you switch on per campaign once you have read enough to trust it.
Does a reply actually stop the follow-ups?
It should happen automatically on every outcome: replied, meeting booked, not interested, unsubscribed. Ask directly. The follow-up that lands after someone already replied is the one that costs you the deal.
How is it priced, and what is metered?
Per seat, per contact, per enriched record, per email, per call minute: what is metered matters more than the headline. One credit pool shared by enrichment, writing and calling is far easier to forecast than four separate meters.
Can it book the meeting itself?
Booking is where automation pays off or falls apart. Ask whether the agent reads real availability or proposes times and hopes. An agent that invents a slot makes a worse impression than no automation at all.
How GNX Sales compares
We built GNX Sales because, across most of the category, the honest answer to those seven questions is disappointing. Here is where we land against the usual pattern.
The full capability list is on the platform page, the voice agent and its pre-launch testing are on the AI voice agent page, and pricing shows what each plan includes.
Frequently asked questions
What are AI SDR tools?
Tools that automate the work of a sales development rep: building a target list, researching each account, writing the first email and follow-ups, handling early replies, and booking a qualified meeting. They range from an AI writing button on a sequencer to full agents that run the whole motion.
Are AI SDR tools worth it?
Yes, when your bottleneck is research and writing volume, not product-market fit. If you know who buys and why, an AI SDR removes the repetitive half of reaching them. If you do not know yet, faster outreach to the wrong people just fails faster.
How much do AI SDR tools cost?
It varies widely. Of the AI SDR pricing pages we checked in October 2026, some charge per prospect, published subscriptions start around $500 a month and climb into the thousands, and several well-known tools do not publish prices at all. Watch what is metered more than the headline: per seat, per contact, per enrichment and per call minute add up very differently. GNX Sales runs from $59 to $479 a month, with email, enrichment and calls drawn from one credit pool.
Can an AI SDR replace a human SDR?
It replaces the repetitive part of the role, not the judgment. Sourcing, qualifying, research, writing, follow-up and scheduling can run on their own. Discovery calls, deal strategy and real negotiation still need a person. The role is also hard to keep staffed: the average SDR stays 1.9 years and takes about 3 months to ramp, so every new hire restarts the clock.
What is the biggest risk with an AI SDR tool?
Confident, false personalisation. A message about a problem the company does not have does more damage than a generic one, because it tells the reader nobody looked. Choose a tool that stops instead of guessing when the context is thin.