Visibility in this ranking can be paid for. Payment moves a vendor's position within the
shortlist; it never adds a vendor, and it never changes a word of the review. The largest vendors in AI SDR software
cannot hold places 1 to 3. Places 1 to 3 go to challengers, vendors outside the best-known brands in a category,
wherever the category has them; the established names follow from place 4 in their ranked order. How it works: placement disclosure ·
editorial process.
The 12 tools, reviewed
#1 Unify
Chat-driven outbound with signals, data and sequencing · United States · unifygtm.com
Signals Chat interface Sequencing
Unify is the entry we would hand to a founder or a two-person sales team that wants to see whether AI-assisted outbound works before signing a contract. The price ladder is on the page: a free tier, $20 a seat to add copywriting and credit top-ups, $60 a seat for CRM sync and a 14-day trial.
- Pricing: Per seat / month plus credits. Free plan with limited credits and up to 3 seats. Free plan: free plan.
- Best for: Small sales teams starting outbound
- Strengths: Chat-based prospecting agent; Company and contact database; Multi-vendor email and phone waterfall.
Where it falls short
Credits are the real meter, so heavy searching, enrichment and AI drafting will consume the 2,400 per seat on Pro. CRM sync is read-only below Business.
Wrong for
A team that needs tens of thousands of cold emails a month from many mailboxes.
Visit Unify →
#2 Instantly
Cold email sending with warmup, leads and AI replies · United States · instantly.ai
Cold email Deliverability Lead database
Instantly started as a mailbox-warmup and sending tool, and it is still best understood that way: connect as many mailboxes as you like, warm them, rotate sends and read every reply in one inbox.
- Pricing: Per plan / month (volume tiers). Outreach Growth plan $47 per month (unlimited email accounts and warmup, 5,000 emails a month, 1,000 uploaded contacts). Free plan: none.
- Best for: Agencies and founders sending volume
- Strengths: Unlimited email accounts; Unlimited warmup; AI reply agent.
Where it falls short
The pricing page mixes outreach plans, credit plans and bundles under similar names, which makes a like-for-like quote slow. The AI agents sit on top of a sender and do not run the campaign strategy for you.
Wrong for
A sales leader who wants an agent to own prospecting and meeting booking without supervision, or a team that wants a CRM-centred workflow.
Visit Instantly →
#3 Clay
Spreadsheet-style data enrichment and AI research workflows · United States · clay.com
Waterfall enrichment AI research Workflow builder
Clay is not a sales agent, and that is why it sits third rather than first. It is a table where each row is a prospect and each column calls a data vendor or an AI step, and in the hands of someone who enjoys building it produces better lists and more specific first lines than the all-in-one agents.
- Pricing: Usage-based (actions and credits). Free plan with 500 actions and 100 data credits a month. Free plan: free plan.
- Best for: Ops-minded teams building custom outbound
- Strengths: Waterfall enrichment across 150+ providers; Claygent AI research agent; Native email sequencer.
Where it falls short
Two usage meters, plus rollover rules that differ by plan, make the bill hard to forecast. It takes real setup time and someone who thinks in workflows. The native sequencer is a basic sender next to dedicated tools.
Wrong for
A seller who wants outbound running tomorrow without building anything.
Visit Clay →
#4 Apollo.io
Contact database with sequencing, dialer and AI assistant · United States · apollo.io
Contact data Sequencing Incumbent
For a buyer who wants contact data, a sequencer and a dialer in one account at a low entry cost, Apollo remains the default that every newer tool is compared against. The free Starter plan has no time limit, the database spans 240 million contacts and 30 million companies, and its credits cover emails, phone numbers, warmup, domains, mailboxes and AI-researched data.
- Pricing: Free + paid tiers (credits). Four plans: Free, Basic, Professional and Custom. Free plan: free plan.
- Best for: Teams wanting data and sequencer together
- Strengths: 240M contacts and 30M companies; Email sequencing; Parallel dialer.
Where it falls short
Credits expire each cycle and cannot roll over, and one plan level applies to the whole account, so a single heavy user raises everyone's tier.
Wrong for
A team that wants an autonomous agent handling replies and meeting booking.
Visit Apollo.io →
#5 AiSDR
AI outbound agent priced per person prospected · United States · aisdr.com
AI agent Pay per contact LinkedIn + email
AiSDR charges for outcomes of effort rather than seats: you pay $1.50 each time it works a new person, and research, lists and copywriting cost nothing extra. That makes a first test cheap and the arithmetic simple, since 1,000 contacts is $1,500.
- Pricing: Per contact prospected. Pay as you go at $1.50 per person prospected, charged daily with no contract. Free plan: none.
- Best for: Lean teams wanting an autonomous outbound agent
- Strengths: Ami AI agent; 2B+ profiles; Waterfall enrichment across 20 providers.
Where it falls short
At 5,000 contacts a month the pay-as-you-go bill reaches $7,500, so volume buyers must negotiate. There is no free tier or published trial, only a no-card sign-up.
Wrong for
A high-volume sender who wants the lowest price per email.
Visit AiSDR →
#6 Amplemarket
AI sales platform with signals, dialer and Duo copilot · United States · amplemarket.com
Intent signals Dialer Duo copilot
Amplemarket is built around the idea that outbound should start from a trigger, such as a closed-lost deal, a champion changing jobs or a post that mentions a competitor, and its Duo copilot turns those triggers into one-to-one sequences. Phone is first-class: the parallel dialer and, on Growth, voice messages sit next to email and LinkedIn.
- Pricing: Per plan / month (annual term). Startup is $600 per month on an annual term with 2 users and 27,000 contacts. Free plan: free trial.
- Best for: Mid-sized teams replacing several outbound tools
- Strengths: Duo copilot; AI intent signals; Multichannel sequences.
Where it falls short
The cheapest plan is $600 a month on an annual term, against $20 for a Unify Base seat. Larger plans are quote-only. The AI voice and inbox features sit on the higher tiers.
Wrong for
A solo founder or a team testing outbound for a month.
Visit Amplemarket →
#7 Lemlist
Multichannel outreach with a lead database and AI agents · France · lemlist.com
Multichannel French vendor lemAgent
Lemlist earns the seventh place as the one Paris-headquartered option in this ranking and as a sequencer that has added agents without changing its price shape. The Email plan is a flat $55 a month for unlimited users and 50,000 emails; Multichannel adds LinkedIn, SMS, WhatsApp as an add-on and a built-in dialer at $87 a user.
- Pricing: Flat or per user / month. Email plan $55 per month billed annually ($69 monthly) with unlimited users and 50,000 emails. Free plan: free trial.
- Best for: Teams wanting email plus LinkedIn and calls
- Strengths: 650M+ lead database; lemAgent AI agents; LinkedIn automation.
Where it falls short
The agent features advise and personalize, and a person still builds campaigns and handles meetings. Data and signal credits are separate purchases, and the multichannel plan scales per user.
Wrong for
A buyer who expects an agent to run the whole funnel and book meetings.
Visit Lemlist →
#8 Smartlead
Cold email infrastructure with agents and master inbox · Australia · smartlead.ai
Cold email Unlimited mailboxes Agencies
Smartlead is an infrastructure product first: unlimited mailboxes and leads in storage, automatic warm-up and DNS handling, sender rotation and a master inbox, with a dedicated-tenant option for sender reputation. Plans scale by monthly sends from 6,000 to 500,000, so a multi-client agency pays for volume rather than for headcount.
- Pricing: Per plan / month (send volume). Base $39, Pro $94, Unlimited Smart $174 and Unlimited Prime $379 per month, sized by monthly sends (6,000 to 500,000). Free plan: free trial.
- Best for: Agencies running many client mailboxes
- Strengths: Unlimited email accounts; SmartInfra dedicated infrastructure; SmartProspect database.
Where it falls short
A team without deliverability experience will be handed DNS records, warm-up pools and sending patterns to manage. The plan table is sized by sends and verified prospect emails, so a team has to forecast both.
Wrong for
A sales manager who wants an agent writing and handling replies unattended.
Visit Smartlead →
#9 Warmly
Website visitor identification with AI chat and outreach · United States · warmly.ai
Inbound Visitor identification Chat agent
Warmly works from the opposite end of the funnel: it recognizes who is on your site, scores them against your ideal customer profile and has an AI chat agent open a conversation, route the lead or follow up by email.
- Pricing: Annual or quarterly subscription. AI Web-Deanonymization from $10,000 a year, Inbound Chat from $20,000 and AI Inbound Autopilot from $30,000, each from 10,000 credits a month. Free plan: none.
- Best for: Marketing-led teams with steady site traffic
- Strengths: Person-level visitor identification; AI chatbot with Studio agents; Warm calling in live chat.
Where it falls short
Without steady site traffic there is little to identify, and visitor identification rates will vary by market and by how much of your audience is reachable. The entry price is above every self-serve tool here.
Wrong for
A company with a small or mostly direct-traffic website, or a seller who needs cold outbound to named accounts.
Visit Warmly →
#10 Artisan
Ava, an AI BDR for end-to-end outbound · United States · artisan.co
AI BDR Quote only Managed rollout
Artisan sells the clearest version of the AI sales rep idea: Ava finds contacts in a 250-million-record database, sends personalized messages across email and social, answers replies and books meetings, with calls queued for your reps.
- Pricing: Quote only. Quote only. Free plan: none.
- Best for: Teams buying an autonomous BDR with onboarding
- Strengths: Ava AI BDR; 250M+ verified B2B contacts; Autonomous replies and meeting booking.
Where it falls short
No price on the page, and volume is expressed as leads contacted rather than meetings booked. Results depend on the quality of the targeting brief and on mailbox health that you share responsibility for.
Wrong for
A buyer who wants to compare prices without talking to sales, or a founder with a tight budget.
Visit Artisan →
#11 Qualified
Piper, an AI SDR agent for inbound pipeline · United States · qualified.com
Inbound Salesforce Chat and email agent
Qualified is the inbound specialist: Piper greets visitors on your site by chat, voice or video, follows up in email, qualifies them against your account data and books the meeting. Plans are defined by capacity (monthly web sessions and active email contacts) instead of seats, and all include an agent studio, reporting and integrations with Salesforce and 20-plus other systems.
- Pricing: Quote only (sessions and contacts). Quote only. Free plan: none.
- Best for: Salesforce teams converting inbound traffic
- Strengths: Piper AI SDR agent; Website conversations in text, voice and video; Email conversations.
Where it falls short
Pricing is not published and starts with a demo. It does not do cold outbound to lists, so it does not replace a sequencer. The packaging assumes sizeable web traffic and a Salesforce-centred stack.
Wrong for
An outbound-first team with a modest website.
Visit Qualified →
#12 11x
Digital worker agents for outbound, inbound and expansion · United States · 11x.ai
Voice agents Outbound and inbound Demo only
11x is the broadest pitch here: named agents handle outbound sequences, inbound lead qualification and calls, and expansion plays inside existing accounts, across voice, chat, email, social and SMS. It has a real-time lead database, deliverability monitoring, a sequence builder and integrations with CRMs and Slack.
- Pricing: Quote only. Not published; the site offers a demo and a Try Voice AI button, and a pricing page we tried returned not found. Free plan: none.
- Best for: Revenue teams buying agents through a sales process
- Strengths: Outbound and inbound agents; AI phone agent; Multi-channel sequences.
Where it falls short
No published pricing or plan structure, so comparison requires a sales conversation and a contract under signed order forms. The legal pages name a US company and a UK limited company, which complicates the contracting party.
Wrong for
A small team that wants to test outbound with a card and a monthly bill.
Visit 11x →
Questions and answers
What is the best AI SDR software in 2026?
Unify ranks first of 12, best for small sales teams starting outbound. Instantly is second (agencies and founders sending volume) and Clay third (ops-minded teams building custom outbound). Places 1 to 3 go to challengers, vendors outside the best-known brands, wherever the category has them.
What does an AI SDR do that a normal email sequencer does not?
A sequencer sends a fixed series of messages to a list you supply.
How much does AI SDR software cost?
The cheapest entry points are free plans at Unify, Clay and Apollo, a $39 Smartlead Base plan, and Instantly's $47 outreach plan. Seat-based plans run from $20 to $87 a user a month (Unify Base to Lemlist Multichannel).
Will an AI SDR damage my email deliverability?
It can, because the same tool that scales a campaign scales a mistake. Risk rises with volume, poor list quality and sending from your main domain. Use separate sending domains, warm mailboxes before launch and cap daily sends.
Is AI-written cold email legal in Europe?
The rules depend on the country, the type of recipient and the legal basis you rely on, and they were written before AI drafting.
Do I still need a human SDR if I buy one of these tools?
Usually yes, in a different role. The tools remove list building, research and first-touch drafting, but someone still has to set targeting, review replies on sensitive accounts, take the calls and fix what the agent gets wrong.
Which tools work with HubSpot and Salesforce?
Most do, to different depths. AiSDR has two-way HubSpot sync and Salesforce on its team plans, Artisan syncs with both, Unify reads from both on Pro and writes on Business, and Qualified lists Salesforce CRM as its lead integration.
Which AI SDR tools have a free plan?
Three products here have a permanent free plan: Unify (limited credits, up to three seats), Clay (500 actions and 100 data credits a month) and Apollo (a free Starter plan).
What is the difference between outbound and inbound AI SDRs?
An outbound agent starts from a list of people who have not asked to hear from you and contacts them by email, LinkedIn or phone.
Should I buy an AI SDR or build one from Clay plus a sender?
Build when you have someone in operations who likes workflows, a narrow target market and the patience to tune messages. Clay supplies waterfall data and AI research, and a sender such as Instantly or Smartlead handles delivery.
What happens to my leads and sequences if I cancel?
Your CRM keeps whatever was synced, but sequences, agent prompts and reply classifications rarely transfer. Export lead lists, suppression lists and conversation history before you cancel, and ask each vendor how long data is held afterwards.
