Key takeaways
- Apollo is the all-in-one pick: database, enrichment and sequencing from $49/seat/month billed annually. Professional is now listed at $79/seat/month, not $99.
- Clay is the data and workflow layer. It now has a native sequencer, so "no sending" is out of date, but most teams still pair it with a dedicated sender.
- Smartlead is sending infrastructure: unlimited mailboxes, warmup, rotation, from $39/month.
- 11x is an AI SDR sold per lead, starting around $3,750/month billed annually. It is a different category with a very different price tag.
- Most working stacks are two or three tools, not one. Apollo plus Smartlead, or Clay plus Smartlead, covers a lot of ground for under $500/month.
What these four tools actually do
The shortlist question "Apollo vs Clay vs Smartlead vs 11x" is slightly misleading, because they do not sit on the same layer of the outbound stack. A clean way to think about it:
- Data: who to contact and what to know about them (Apollo, Clay)
- Sending: getting emails into inboxes at volume without wrecking your domains (Smartlead, Apollo, Clay Sequencer)
- Execution: someone, or something, doing the prospecting, writing, replying and booking (human SDRs, or 11x)
Apollo spans data and sending. Clay is mostly data with a growing sending side. Smartlead is almost purely sending. 11x tries to replace the execution layer entirely. Once you see it that way, the comparison gets less confusing and the buying decision gets easier.
Quick comparison
| Tool | Layer | Starting price | Best for | Main weakness |
|---|---|---|---|---|
| Apollo | Data + sequencing + dialer | Free; Basic $49/seat/mo annual; Professional $79; Organization $119 | Small outbound teams, founders | Single-source data quality varies; less flexible workflows |
| Clay | Enrichment and workflow orchestration | Free; Launch $185/mo ($167 annual); Growth $495/mo ($446 annual) | RevOps, agencies, custom ICPs | Credits burn fast if workflows are sloppy |
| Smartlead | Cold email infrastructure | From $39/mo (verify monthly vs annual) | High-volume senders, agencies | Power-user setup, learning curve |
| 11x (Alice, Julian) | AI SDR | Growth from $3,750/mo billed annually | Teams replacing SDR headcount | Cost, nuance in replies, contract terms |
Prices move. Apollo's own page carries a note that its pricing is introductory and may change, and Clay overhauled its plans in spring 2026. Check each vendor's pricing page before you budget.
Apollo: the consolidation play
Apollo is the tool most small teams start with, and the numbers back that up. According to Ramp's vendor data cited by Apollo, 38% of organizations using any sales data provider use Apollo, up 5 points year over year. That is Apollo's own comparison page quoting Ramp, so read it as favorable but sourced.
What you get
A large contact database (commonly cited at around 275M contacts, though I could not re-verify that figure), native enrichment, multi-channel sequences, a dialer, and AI features like lead scoring and email generation. One bill, one login.
Pricing in 2026
The pricing page currently shows:
- Free: $0, 900 credits per seat per year
- Basic: $49/seat/month billed annually, 30,000 credits per seat per year
- Professional: $79/seat/month billed annually, 48,000 credits per seat per year
- Organization: $119/seat/month billed annually, minimum 3 seats, 72,000 credits per seat per year
Older reviews still quote $99 for Professional. Ignore that. Watch the add-ons, though. The advanced dialer is $119 per team per month, and Inbound bundles run $119 to $639. Also check mailbox and daily send caps by plan before you assume Apollo can handle cold volume on its own. The lower tiers appear to cap daily emails and mailboxes per user, and that is exactly where teams outgrow it and bolt on a dedicated sender.
Where it falls short
Data is single-source. If your ICP is niche, coverage and accuracy can be uneven, and you cannot easily cascade through other providers. Sequences also work the way Apollo decided they should. If you want conditional, account-level research logic, you will hit the ceiling.
Clay: the workflow engine
Clay is not a database in the Apollo sense. It is a spreadsheet that calls APIs. You import a list, run each row through a cascade of data providers (waterfall enrichment across 150+ partners), then add AI columns that research the account, score fit, or write an opener.
Pricing in 2026
Clay's old Starter $149 and Pro $349 plans are gone. Current structure:
- Free: 500 actions and 100 data credits per month, up to 200 rows per table
- Launch: from $185/mo monthly or $167/mo annual. 15,000 actions and 2,500 data credits
- Growth: from $495/mo monthly or $446/mo annual. 40,000 actions and 6,000 data credits
- Enterprise: custom. Vendr reports a median around $60K/year across 97 purchases
- Every plan includes unlimited seats
The price is built from two parts: an actions tier plus a data credits tier. Launch is $60 for actions plus $125 for credits, for instance. Actions measure platform usage. Data credits buy data and AI from the partner marketplace. Third-party reports say Clay cut credit costs on its most used enrichments by about 50% and no longer charges for empty results, but that is secondhand, so test it on a small batch.
The sequencer change
A lot of comparison articles still say Clay has no native sending. Clay now has a Clay Sequencer, available from Launch via the Sequencer or integrations. Growth adds buying domains and emails for it. I would still not rely on it as my only sender for serious volume. A dedicated tool handles inbox rotation and deliverability better, but it is no longer correct to say Clay cannot send.
Where it falls short
The honest warning: out of the box it is a blank grid. People who get great results have invested real time in workflow design and prompt engineering, and teams new to it burn credits faster than expected. Budget for a learning period, and set a credit cap per table before you run anything on a full list.
Smartlead: sending infrastructure
Smartlead exists for one reason: send cold email at scale without your domains dying. Unlimited mailboxes, automated warmup, inbox rotation, a master inbox, and an API.
Pricing
From the pricing page:
- Base: $39/mo, 2,000 contacts, 6,000 sends
- Pro: $94/mo, 30,000 contacts, 90,000 sends
- Smart and Prime tiers exist at 150K and 500K sends, but I could not read their prices
- A verified email add-on is listed at $59/mo
The yearly toggle shows 17% off, so the numbers shown may be annual-discounted. Confirm before you commit. There is also SmartServices, a done-for-you outbound option (50,000 or 100,000 emails per month, with a dedicated GTM engineer). Pricing is unpublished.
Where it falls short
It is volume first. G2 reviewers rate it around 4.6/5 from 300+ reviews, and the recurring complaints are a power-user setup and a learning curve. It also does not give you data. You bring the list, which is why it so often sits behind Clay or Apollo.
11x: the AI SDR
11x sells digital workers. Alice handles outbound prospecting, multichannel outreach and meeting booking. Julian qualifies inbound leads over phone, chat and SMS.
Pricing is now published
The Growth plan starts at $3,750/month billed annually, about $45K a year, with up to 5 end users, 2,000 new prospects per month, and 11x-managed Gmail mailboxes. Pro (10 users, 5,000 prospects/month) and Enterprise (10,000+ prospects, SSO, custom DPA and SLA) are custom. One wrinkle: the FAQ on the same page says "starts at $36,000 per year," which does not match the $45K the card implies. Get the number in writing.
Pricing is per lead rather than per send. Contact data, deliverability, warmup, scheduling and CRM sync are bundled, and you bring your own CRM license. 11x frames this against a fully loaded SDR at $8K to $12K per month. Older reviews guessing at $5K to $15K a month and "unpublished pricing" are out of date.
What reviewers say
This is the part to read carefully, because 11x had a rough start. After the early-2025 TechCrunch controversy, one reviewer says Alice 2.0 is a genuine rebuild. The same reviewer tested it on 200 leads and found it still struggles with nuanced replies, sending generic follow-ups or escalating, and estimated it replaces roughly 40% of a human SDR's work. Users also report difficulty exiting contracts, and a competitor claims it lacks real-time buying signals like job changes or funding. Treat the competitor claim as marketing, and note that 11x runs its own guides competing on Clay content, so its statements about Clay deserve the same skepticism.
My take: 11x makes sense if you have budget, a defined ICP, and a team that can review what the agent does. It is a poor fit if you are hoping to skip hiring because you cannot afford an SDR. At $45K a year, you are better off with a part-time contractor plus Apollo and Smartlead.
How the stacks compare on cost
| Stack | Rough monthly cost | Who it suits |
|---|---|---|
| Apollo alone (Basic, 1 seat) | ~$49 | Solo founder testing outbound |
| Apollo Professional + Smartlead Base | ~$118 | Small team needing more send capacity |
| Clay Launch + Smartlead Pro | ~$260 to $280 | Agency or RevOps team with custom enrichment |
| Apollo (data) + Clay Growth + Smartlead | $600+ | Teams with complex ICPs and real volume |
| 11x Growth | ~$3,750 | Teams replacing SDR capacity |
These are list prices for one seat where seats apply, and they exclude domains, mailbox costs and verification add-ons.
Which one should you pick
If you are a founder or a two-person sales team
Start with Apollo. One tool, one bill. Add Smartlead when you hit send caps or deliverability problems.
If you run an agency or a RevOps function
Clay for the data layer, Smartlead for sending. This is a common pattern, and operators on Reddit's r/agency describe moving from Apollo alone to Clay plus Smartlead for exactly this reason, using Apollo's technology filters to find companies and then layering on employee count and funding stage. Keep Apollo in the stack as one data source if its coverage helps.
If you have budget and want to scale activity, not headcount
Look at 11x, but run a pilot, demand the contract exit terms, and measure meetings that become pipeline, not emails sent.
If your goal is inbound from AI search rather than outbound
This whole category is outbound. If you also want to be recommended when buyers ask ChatGPT or Perplexity for vendors in your space, that is a separate problem. Tools like Promptwatch track how your brand shows up in those answers, and the GEO software directory at bestgeosoftware.com lists alternatives.
Practical tips before you spend anything
- Run a 200-lead pilot in each tool you are considering, using the same ICP.
- Use separate sending domains from your main domain. Warm them up first.
- Verify emails before sending, whatever tool found them.
- Cap Clay credits per table, and test on 50 rows before you run 5,000.
- Do not count emails sent. Count replies, meetings booked, and pipeline created.
- Read the cancellation terms, especially on annual contracts.
What I could not verify
Some things are still open: Smartlead's top-tier prices and whether the displayed numbers are monthly or annual, Apollo's per-plan mailbox and send limits (the scraped table was misaligned), and independent reply-rate benchmarks for any of these tools. Cold-email deliverability rules from Google and Yahoo for bulk senders also matter and deserve their own check. For wider software comparisons, the directory at surferstack.com is a decent place to keep browsing.
Bottom line
Pick by layer, not by brand. Apollo if you want one tool. Clay if your data logic is unusual. Smartlead if volume and deliverability are the problem. 11x if you have the budget to hand execution to an agent and the discipline to audit it. For most teams in 2026, a two-tool stack under $300 a month beats any single platform.