Short answer: a solo founder's outbound stack has two halves — finding and enriching the right prospects, then sending sequences and triaging replies so you only talk to interested people. Some agents below do both; the safer starter pattern is a data/enrichment tool plus a sending tool you control, because deliverability (landing in the inbox, not spam) is the whole game and it punishes fully-autonomous blasting.
This is also the job where pricing pages lie by omission. A September 2026 audit found half of AI SDR vendors publish no complete price at all, and the published ones often exclude the extras you cannot run without: warmed sending domains, data credits, verification, and the sequencer itself. Every True Solo Cost below is built at two stated volumes — about 500 and about 2,000 prospects a month — and each listing names the add-on costs we found on the vendor's own pages.
Finally, be clear which job you are buying. Outbound SDR agents (most of this page) go and find people. Inbound lead-capture chatbots wait on your website — that's the Answer Customers job, and vendors blur the two deliberately. Each listing here is labelled by what it actually does.
| # | Agent | True solo cost (low) | True solo cost (typical) | Billing unit | No-code | Setup | Human control | Solo fit |
|---|---|---|---|---|---|---|---|---|
| 1 | Apollo.io One database, sequencer and dialer for a founder who wants outbound without stitching tools together | $49/mo — 1 user on Basic billed annually; 30,000 credits/year (about 2,500/mo) covers roughly 500 email prospects/mo, assuming email reveals only and no heavy mobile lookups | $49/mo — same Basic seat covers roughly 2,000 email prospects/mo within the annual credit pool; stepping to Professional at $79/mo is about workflow and dialer features, not prospect volume, assuming mobiles are used sparingly | per seat | Under 1 hour | Acts + logs everything | Solo-Ready | |
| 2 | Instantly Flat-fee cold email sending with unlimited mailboxes, plus a lead database sold on credits | $94/mo — Starter bundle (Outreach Growth $47 + Growth Credits $47, 1,500 credits/mo, 1,000 uploaded contacts, 5,000 emails/mo) for about 500 prospects/mo, assuming roughly 1-1.5 credits per verified work email; domains and mailboxes extra | $194/mo — Scale bundle (Hypergrowth sending plus 5,000 credits/mo and 25,000 uploaded contacts) for about 2,000 prospects/mo, because the Starter credit and contact caps run out first | per prospect | Same day | Acts autonomously | Solo-Ready | |
| 3 | Lemlist Multichannel sequences across email, LinkedIn and calls, with warm-up and a built-in lead database | $69/mo — Email plan billed monthly for about 500 prospects/mo (50,000 emails/mo across the team), assuming you import your own list; finding up to about 400 emails/mo through lemlist adds roughly $20 in data credits | $109/mo — Multichannel for 1 user for about 2,000 prospects/mo when LinkedIn steps are part of the sequence, plus data credits on top; email-only at this volume stays on the $69 Email plan before credits | per seat | Same day | Acts + logs everything | Solo-Ready | |
| 4 | Smartlead Deliverability-focused cold email sending with unlimited mailboxes and agency-grade infrastructure | $98/mo — Base $39 plus the $59/mo verified prospect emails add-on for about 500 prospects/mo (Base allows 2,000 contacts and 6,000 sends/mo), assuming short sequences; mailboxes extra at about $4.50/mailbox/mo plus domain fees | $153/mo — Pro $94 plus the $59/mo verified add-on for about 2,000 prospects/mo with longer multi-step sequences (Pro allows 30,000 contacts and 90,000 sends/mo); Unlimited Smart at $174/mo includes 50,000 verified emails instead | per prospect | Same day | Acts autonomously | Solo-Ready | |
| 5 | Persana AI Clay-style enrichment tables and AI research agents at a lower entry price, with sending via integrations | $68/mo — Starter billed annually (2,000 credits/mo) for about 500 prospects/mo, assuming email-first enrichment at 1 credit per email and a separate sequencer subscription still to pay | $68-$151/mo — Starter covers about 2,000 email prospects/mo at 1 credit each; Growth at $151/mo billed annually is the realistic tier at this volume once sequencing integrations, API use and any phone lookups (10 credits each) are included, plus your sequencer fee | per credit | Same day | Acts + logs everything | Small-Team Ready | |
| 6 | AiSDR A pay-per-prospect autonomous SDR that researches, writes, sends and works replies across email and LinkedIn | $750/mo — 500 prospects at $1.50 per person prospected, assuming pay-as-you-go with research, lists and writing included; a warmed mailbox add-on, if bought, is extra | $3,000/mo — 2,000 prospects at $1.50 per person at list price; the vendor states volume team plans can lower the per-contact price by up to 40%, which would put this nearer $1,800/mo, but that rate is agreed on a team plan rather than self-serve | per prospect | Same day | Acts autonomously | Small-Team Ready | |
| 7 | Artisan AI Ava, an autonomous AI BDR that prospects, writes, sends and books, now with a self-serve startup tier | $250/mo — Intern billed annually (10,000 credits/mo) for about 500 prospects/mo, assuming roughly 20 credits per person for an email campaign without phone enrichment, as the vendor's own estimate states | $1,000/mo — Employee at the 42,000-credit tier billed annually for about 2,000 prospects/mo at roughly 20 credits per lead; the base Employee tier (25,000 credits, about 1,250 leads) is not enough at this volume | per credit | Same day | Acts autonomously | Small-Team Ready | |
| 8 | Clay A spreadsheet-like enrichment workspace that chains 150+ data providers and AI research into one prospect list | $167/mo — Launch billed annually (3,000 Data Credits and 15,000 Actions/mo) for about 500 prospects/mo, assuming a modest waterfall of a few provider lookups per row; heavy Claygent research burns credits faster | $167-$446/mo — Launch can cover about 2,000 prospects/mo only with lean, single-pass enrichment; realistic multi-provider waterfalls plus AI research push most users at this volume to Growth at $446/mo billed annually, and a separate sequencer may still be needed | per credit | Multi-day | Acts + logs everything | Technical | |
| 9 | HubSpot Breeze Prospecting Agent An AI prospecting agent inside HubSpot CRM that watches signals, researches accounts and drafts outreach | About $515/mo — 1 Starter seat at $20 plus roughly $495 of extra HubSpot Credits for 500 recommended leads (500 leads x 100 credits, less the 500 credits included monthly, at $0.010 per credit), assuming the agent is the only credit consumer and intent monitoring is excluded | About $2,015/mo — 1 Starter seat at $20 plus roughly $1,995 of extra credits for 2,000 recommended leads on the same maths; Professional at $90/seat changes the seat fee and included credits (3,000, covering 30 leads) but not the $1-per-lead reality | per seat | Same day | Approves before acting | Small-Team Ready | |
| 10 | Seamless.AI Real-time B2B contact search with verified emails and mobiles, sold on annual, quote-only licenses | Pricing not published — quote only. No honest estimate can be built from official sources for 500 prospects/mo; the published free plan is $0 with 50 one-time credits, and the Basic license's published allowance is 250 credits/mo at an unpublished price | Pricing not published — quote only. At about 2,000 prospects/mo a solo user would need a quoted license well above the Basic license's published 250 credits/mo allowance; the Pro license publishes 10,000 credits/mo but no price, so the monthly cost cannot be stated from official sources | quote | Same day | Acts + logs everything | Small-Team Ready |
One database, sequencer and dialer for a founder who wants outbound without stitching tools together
The most complete solo outbound starter — as long as you accept that you are the SDR and Apollo is the engine, not the rep.
Flat-fee cold email sending with unlimited mailboxes, plus a lead database sold on credits
Excellent value if cold email is your channel — budget for the bundle, not the $47 headline, plus domains and mailboxes.
Multichannel sequences across email, LinkedIn and calls, with warm-up and a built-in lead database
The best pick here if LinkedIn belongs in your sequence — just price the plan plus data credits together, not the headline alone.
Deliverability-focused cold email sending with unlimited mailboxes and agency-grade infrastructure
A strong, honest sending engine for a founder who brings their own list — the $39 headline becomes roughly $98-$153 once data is included.
Clay-style enrichment tables and AI research agents at a lower entry price, with sending via integrations
Good value as a list-building brain for your outbound — but it is one half of a stack, not the whole outbound job.
A pay-per-prospect autonomous SDR that researches, writes, sends and works replies across email and LinkedIn
The real autonomous SDR experience with honest pricing — powerful for narrow, high-value prospect lists, punishing for volume.
Ava, an autonomous AI BDR that prospects, writes, sends and books, now with a self-serve startup tier
A credible hire-an-agent option for a funded solo founder — use the published startup tier and avoid the quote-only track.
A spreadsheet-like enrichment workspace that chains 150+ data providers and AI research into one prospect list
Superb if data quality is your bottleneck and you enjoy building workflows — overkill and slow to learn for a first outbound campaign.
An AI prospecting agent inside HubSpot CRM that watches signals, researches accounts and drafts outreach
Sensible only if HubSpot is already your home — the $1-per-lead meter quietly turns a cheap seat into a $500-plus month at modest volume.
Real-time B2B contact search with verified emails and mobiles, sold on annual, quote-only licenses
The finder works, but quote-only annual pricing is the worst fit in this list for a solo founder who needs predictable monthly costs.
These agents are listed under another job first, but genuinely cover this one too. Their full listings live on their primary job page.
Outreach must comply with the rules where your recipients are (CAN-SPAM in the US, stricter consent rules elsewhere) — the tools don't transfer that responsibility. Domain burning is a real risk: reputable setups send from separate warmed domains, never your main one. Listings that don't support separate sending domains say so in their cons.
Because the category grew up selling to sales teams with budgets, via demos. For a solo founder that opacity is a cost in itself — you can burn a week in sales calls. We mark those listings 'Pricing not published — quote only' and rank transparent tools above them for solo use.
Clay is primarily enrichment and orchestration — it builds and enriches lists; most solos pair it with a sender like Instantly or Smartlead. All-in-one SDR agents (for example AiSDR) bundle both but give you less control over deliverability. The listings state which half each product covers.
Fewer than the tools encourage. 500–2,000 well-targeted prospects with genuine personalisation outperforms 20,000 sprayed — for reply quality, deliverability and the hours you spend on follow-up. That's why our cost scenarios use those volumes.
Building for a different job? Do the Books · Answer the Phone & Book · Run Operations & Workflows · Answer Customers · Run Admin & Scheduling