The best AI SDR tool is the one that does its homework before it writes. Every product in this category promises personalized outreach; fewer research the prospect first, write for one person and stop the moment they reply. We ranked nine on that work, for small teams and founders who need pipeline without a sales department. Every price below was read on the vendor’s own pricing page on September 28, 2026.
We make CellCog and it is ranked first. That conflict is stated under the table, every claim about CellCog is dated or linked, and the table names who wins on each axis where we do not.
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An AI SDR is software that does the sales development work: builds a lead list from your ideal customer, researches each prospect, writes outreach, follows up on a schedule and hands interested replies to a human.
The category holds three kinds of tool. Sequencers with AI (Instantly, Apollo, Reply’s base plans) run the steps you design. Autonomous AI SDRs (AiSDR, 11x, Artisan, Salesforge’s Agent Frank, Reply’s Jason, Amplemarket) run the motion. AI employees (CellCog) take the whole role.
CellCog ranks first for small teams because one AI employee researches every account, writes each email for one person, follows up up to three times, stops the moment they reply, and waits for your yes before a new sequence starts. We make CellCog; the conflict is declared under the table.
AiSDR is the pick for a founder who wants a dedicated AI SDR with a public price and no sales call: Solo is $250 a month billed monthly for 200 AI-researched contacts. 11x and Artisan price through sales and suit larger outbound teams.
Good AI SDRs stop when a prospect replies and keep cold email off your main domain. CellCog sends from dedicated sending domains, caps daily volume, and hands replies back with the thread and research attached.
Pick by who should do the work. If you want to design the sequence yourself, buy a sequencer. If you want a tool to run outbound on its own, an autonomous AI SDR. If you want the research, writing, follow-up and reporting owned end to end, an AI employee.
§ 01Three kinds of AI SDR tool
The label covers three different products, and most disappointment comes from buying the wrong kind.
Sequencers send the steps you design to the list you upload; AI helps with the writing, but you own the strategy and the list. Autonomous AI SDRs take an ideal customer profile and run the motion: sourcing, writing, follow-up and reply handling. An AI employee takes the role itself, including the research before each email, the approval before the first send and the report on what happened.
§ 02The AI SDR rankings
| Rank | Tool | Cheapest listed plan | What it does | Best for |
|---|---|---|---|---|
| 1 | CellCog | Plans from $8/mo; usage-based; you pay for the work, not the hire | Builds lead lists, researches each account, writes one-to-one emails, up to three follow-ups, stops on reply, asks before a new sequence | Small teams handing over the whole outbound role |
| 2 | AiSDR | Solo $250/mo billed monthly, 200 AI-researched contacts | AI-researched emails and LinkedIn actions, HubSpot sync, self-serve setup | Founders who want a public price and no sales call |
| 3 | 11x | Quote through sales | Alice, an AI SDR that engages prospects across channels and handles replies | Larger teams buying a managed AI SDR |
| 4 | Artisan | Quote through sales (Team plan ~2,500 leads contacted/mo) | Ava, an AI BDR that books meetings for your reps | Sales teams running their first serious outbound |
| 5 | Salesforge (Agent Frank) | $417/mo billed yearly, up to 1,000 active contacts | Automated prospecting with auto-pilot and co-pilot modes, on top of the Salesforge sequencer | Teams already sending with Salesforge |
| 6 | Reply.io (Jason AI) | Sequencer from $49/user/mo billed yearly; Jason AI SDR priced separately | Jason finds prospects, writes messages and manages responses | Multichannel teams (email, LinkedIn, calls) |
| 7 | Amplemarket | Startup $600/mo, annual term, 2 users, 27,000 contacts | Multichannel sequences with AI intent signals and the Duo copilot | Teams that want data and sequencing in one bill |
| 8 | Apollo | Free; Basic $49/seat/mo billed yearly | Contact database, AI research and lead scoring, unlimited sequences | Teams that need the lead data first |
| 9 | Instantly | Growth $47/mo as listed | High-volume cold email sending with unlimited email accounts | Sending at volume on lists you already have |
Conflict of interest: CellCog wrote this ranking and sits at number one. The ranking rewards research before writing, one-to-one emails and approval before the first send, which is how CellCog is built; if you need LinkedIn steps, a dialer or a built-in contact database, rows 2, 6, 7 and 8 are better fits, and we say so. CellCog is not given a score.
§ 03Why this order
CellCog is first because the whole role sits in one AI employee: it builds the list from your ideal customer profile (from your connected Apollo, your CRM or a list you share), reads the company and the person before writing, writes each email for one prospect, follows up at most three times and stops the moment they reply. New sequences wait for your approval, and cold email goes from dedicated sending domains, never your main inbox. It researches with the agent ranked #1 on Deep Research Bench (July 2026), and interested replies come back to you with the thread and the research attached.
AiSDR is second and wins outright on price clarity: its Solo plan is built “For founders and solo sellers who want pipeline without the headcount”, at $250 a month billed monthly, with 800 contacts for $900 a month on the next tier. 11x is third for teams that want a managed AI SDR: “Alice turns your market into revenue. She engages prospects across channels, handles replies, drives qualified meetings and builds pipeline.” Artisan is fourth on the same shape: “Ava, the AI BDR, books meetings for your reps autonomously.” Both price through sales (“Pricing scoped on your plan”, in Artisan’s words).
Salesforge and Reply bolt an AI SDR onto a sequencer you may already use. Salesforge pitches Agent Frank as a way to “Maximize your outreach without inflating your costs by adding an AI Agent to your plan”, with “Auto-Pilot & Co-Pilot Modes”. Reply describes its Jason AI this way: “Jason handles everything from finding prospects to sending personalized messages and managing responses.” Amplemarket, Apollo and Instantly are strongest as data and sending infrastructure: excellent if you design the motion, thinner if you want the motion designed for you.
§ 04Cheapest listed plan, side by side
| Tool | Price | Basis |
|---|---|---|
| Instantly | $47 | Growth, as listed |
| Apollo | $49 | Basic, per seat, billed yearly |
| Reply.io | $49 | Sequencer, per user, billed yearly |
| AiSDR | $250 | Solo, billed monthly |
| Salesforge (Agent Frank) | $417 | Billed yearly |
| Amplemarket | $600 | Startup, annual term |
The first three are sequencers and data plans, not AI SDRs; AiSDR is the cheapest dedicated AI SDR with a public price. 11x and Artisan are left out because they quote through sales, and CellCog is left out because it is usage-based: the cost depends on how much work you assign, so a single monthly number would mislead. See CellCog pricing for how usage is billed.
§ 05Where CellCog stands, angle by angle
| Angle | CellCog | Who wins instead, if not us |
|---|---|---|
| Research before each email | Yes: reads the company and the person first | |
| One-to-one writing | Every email written for one prospect | |
| Approval before the first send | New sequences wait for your yes | |
| Protects your main domain | Cold email only from dedicated sending domains | |
| LinkedIn steps | Email only | AiSDR, Reply.io |
| Calls and dialer | Never cold calls | Reply.io; AiSDR (Aircall steps); Artisan (dialer add-on) |
| Built-in contact database | Uses your connected Apollo, your CRM or your list | Apollo, Amplemarket |
| Flat public monthly price | Usage-based, plans from $8/mo | AiSDR |
§ 06How to choose
- If you already know your sequence and have a list, buy a sequencer (Instantly, Apollo or Reply) and save money.
- If you want a dedicated AI SDR with a public price and no sales call, choose AiSDR.
- If you run a larger outbound team and want a managed product, talk to 11x or Artisan.
- If you want research, writing, follow-up and reporting owned end to end by one AI employee that asks before it sends, choose CellCog.
- Whatever you pick, start with one small list and approve the first batch yourself.
§ 07The honest caveats
Prices change often in this category, several are yearly-billing prices (Salesforge, Apollo, Reply) and two vendors quote only through sales; check the vendor’s page before buying. Reply’s Jason AI price sits behind a sales conversation on its pricing page as read. We did not run a timed benchmark or measure reply rates across all nine; the ranking is based on what each product states it does and what it costs, plus our own product for row one.
§ 08Update log
- September 29, 2026: page opened; prices read on each vendor’s pricing page September 28, 2026.
§ 09Sources
- Vendor pricing pages, read September 28, 2026: AiSDR, 11x, Artisan, Salesforge, Reply.io, Amplemarket, Apollo, Instantly.
- CellCog, AI SDR and AI SDR platforms compared.
Q1What is the difference between an AI SDR and a sales sequencer?
A sequencer sends the steps you design to the list you upload, with AI helping to write. An AI SDR builds the list, researches each prospect and writes the outreach itself. On this list, Instantly and Apollo’s base plans are sequencers; the rest run the motion.
Q2Which AI SDR is best for a small business or a founder?
CellCog or AiSDR. Pick CellCog if you want one AI employee to research, write, follow up and report, and ask before the first send. Pick AiSDR if you want a dedicated AI SDR product at a flat public monthly price.
Q3Do AI SDRs hurt email deliverability?
They can, if they blast. Look for daily sending caps, dedicated sending domains that keep cold email off your company inbox, and follow-ups that stop on a reply. CellCog does all three by design, not as a setting.
Q4Is there a free AI SDR?
Apollo has a free plan with limits and Salesforge, Reply and Amplemarket offer trials. CellCog is free to try, no credit card needed. Test with one small list for a week before an annual plan.
Q5What should I give an AI SDR first?
One ideal customer profile, your offer in three sentences, two case studies and your three most common objections. Approve the first small batch of drafts yourself, read the replies for a week, then widen the list.