11x vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
Compare 11x (sales engagement platform) and TheirStack (data enrichment tool) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
11x is a sales engagement platform built for multi-channel outreach, using Alice for outbound and Julian for inbound lead qualification, while TheirStack is a data enrichment tool for finding B2B lead data through job postings and technographics. TheirStack starts free; 11x uses custom pricing. Teams often use both together rather than choosing one.
Key takeaways
- TheirStack publishes a free entry tier while 11x uses Contact Sales pricing across all three of its plans.
- 11x offers three pricing tiers (Growth, Pro, Enterprise) compared to TheirStack's four tiers (Free, App, API/Webhooks/MCP, Datasets).
- TheirStack's API, Webhooks & MCP plan costs $49/mo and includes 1,500 API credits per month.
- 11x lists nine features including Multi-Channel Sequences, Consented Outbound Calling, and Deliverability & Mailbox Health, none of which overlap by exact wording with TheirStack's eight listed features.
- 11x integrates with Salesforce, HubSpot, Pipedrive, Zoho, Gmail, Slack, and G2, while TheirStack integrates with Clay, LinkedIn Audiences, Make, N8N, and Zapier.
Reviewed and updated September 4, 2026
11x vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
11x is a sales engagement platform; TheirStack is a data enrichment tool. Whether you need one, the other, or both depends on which part of the workflow you are buying for: multi-channel sales outreach and engagement tracking on one side, B2B lead data and contact enrichment on the other. This guide lays out what each vendor publishes.
The Quick Answer
11x is a sales engagement platform for multi-channel sales outreach and engagement tracking; TheirStack is a data enrichment tool for B2B lead data and contact enrichment. By each vendor's own wording, 11x lists multi-channel sequences and sequence builder, and TheirStack lists job search and company search.
TheirStack publishes an entry price of $0/mo; 11x uses custom pricing, so the two cannot be compared on list price.
If your priority is coordinating outreach across email, phone, and social channels, 11x is the one built for it; for finding accurate contact data for target accounts, that is TheirStack. Many teams run one of each.
Understanding the Core Difference
11x is AI digital worker platform for pipeline generation, built around Alice for outbound and Julian for inbound. Alice runs multi-channel sequences with deep research and AI personalization, consented outbound calling and managed mailboxes, while Julian qualifies inbound leads across phone, chat, SMS and WhatsApp.
TheirStack is Job posting and technographics database for sales teams. Finds companies by the technologies they use and the roles they are hiring for, and enriches a company list with technographics and buying intent.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Growth
Free
11x Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Growth | Contact Sales | Up to 5 End Users; 2,000 New Prospects per Month | 11x Managed Gmail Mailboxes, including domain setup, warmup, inbox rotation and monitoring |
| Pro | Contact Sales | Up to 10 End Users; 5,000 New Prospects per Month | 11x Managed Gmail Mailboxes; Multi-language Outreach (105+) |
| Enterprise | Contact Sales | Unlimited End Users; 10,000+ Prospects per Month | 11x Managed Gmail Mailboxes; Custom Integrations + API |
Source: 11x Pricing
TheirStack Pricing (as of September 2026)
| Plan | Price | Contacts |
|---|---|---|
| Free | Free | 50 company credits and 200 API credits per month |
| App | Usage-based | Company credit packs from 1,000 to 200,000 credits |
| API, Webhooks & MCP | $49/mo | 1,500 API credits per month |
| Datasets | Contact Sales | Jobs, Technographics and Buying intents datasets |
Source: TheirStack Pricing
Pricing Analysis
One or both platforms use custom or contact-based pricing for some tiers. Reach out to their sales teams for exact quotes based on your usage needs.
TheirStack offers 4 pricing tiers compared to 11x's 3, giving you more granularity as you scale.
TheirStack includes a free tier, which is helpful for evaluating the platform without upfront cost.
Features Breakdown
- Multi-Channel Sequences
- Sequence Builder
- Smart Replies
- Multi-Lingual Outreach
- Consented Outbound Calling
- Deep Research
- and 3 more listed below
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- and 2 more listed below
11x Key Features
- Multi-Channel Sequences
- Sequence Builder
- Smart Replies
- Multi-Lingual Outreach
- Consented Outbound Calling
- Deep Research
- AI Personalization
- Signals and Triggers
- Deliverability & Mailbox Health
TheirStack Key Features
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
The two lists below are a diff of each vendor's own feature list by exact wording, so a capability both tools offer can appear on either side under a different name.
Listed only by 11x
- Multi-Channel Sequences
- Sequence Builder
- Smart Replies
- Multi-Lingual Outreach
- Consented Outbound Calling
- Deep Research
- AI Personalization
- Signals and Triggers
- Deliverability & Mailbox Health
Listed only by TheirStack
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
Integration Ecosystem
11x Integrations
11x connects with: Salesforce, HubSpot, Pipedrive, Zoho, Gmail, Slack, G2.
TheirStack Integrations
TheirStack connects with: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Integrations listed only by 11x: Salesforce, HubSpot, Pipedrive, Zoho, Gmail, Slack, G2.
Integrations listed only by TheirStack: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Use Case Recommendations
Best Fit for 11x
- Teams that need a wide feature set (9 capabilities listed)
- Organizations with complex tech stacks needing broad integration support (7 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
Best Fit for TheirStack
- Budget-conscious teams looking for an affordable data enrichment tool
- Teams that want to start free and scale up as needs grow
- Enterprise buyers who prefer custom pricing and dedicated support
Feature Comparison Summary
| Feature | 11x | TheirStack |
|---|---|---|
| Starting Price | Contact Sales | Free |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 9 | 8 |
| Integrations | 7 | 5 |
| Founded | N/A | 2021 |
Getting Started Checklist
- Define your multi-channel sales outreach and engagement tracking and B2B lead data and contact enrichment requirements and monthly budget
- Estimate your expected sequences and engagement actions and data credits or contact lookups to find the right tier
- List the integrations your team currently relies on
- Sign up for free trials or demos of both platforms
- Run a small test with each tool before making a commitment
- Evaluate the onboarding experience and support quality
Final Thoughts
11x serves the multi-channel sales outreach and engagement tracking side of an outbound stack and TheirStack the B2B lead data and contact enrichment side. TheirStack publishes an entry price (a free tier), while 11x uses custom pricing for its plans, so compare on features and on the quote you receive. Your decision should weigh pricing against the specific features that matter most for your workflow.
Start with a trial of each to see which platform fits your team's daily process. The best tool is the one your team actually uses consistently.
Pricing and features verified as of September 2026. Visit 11x and TheirStack for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between 11x and TheirStack?
- 11x is a sales engagement platform for multi-channel outreach and engagement tracking, while TheirStack is a data enrichment tool for B2B lead data and contact enrichment. 11x centers on AI digital workers Alice and Julian for outbound and inbound sales motions, whereas TheirStack finds companies by technology use and hiring activity.
- How much does 11x cost compared to TheirStack?
- 11x uses Contact Sales pricing for all three of its plans (Growth, Pro, Enterprise), so no list price is published. TheirStack publishes a free entry tier with 50 company credits and 200 API credits per month, plus usage-based and Contact Sales tiers for higher volumes, making the two hard to compare on price directly.
- Can I use 11x and TheirStack together?
- Yes, the article notes that many teams run one of each since they serve different parts of the workflow. 11x handles multi-channel outreach across email, phone, and social, while TheirStack supplies the underlying contact and company data used to target that outreach.
- Does TheirStack have a free plan?
- Yes, TheirStack offers a Free plan that includes 50 company credits and 200 API credits per month. This lets teams evaluate the platform before committing to a paid usage-based plan or the $49/mo API, Webhooks & MCP tier.
- What integrations does each platform support?
- 11x connects with Salesforce, HubSpot, Pipedrive, Zoho, Gmail, Slack, and G2. TheirStack connects with Clay, LinkedIn Audiences, Make, N8N, and Zapier. According to the article, none of these listed integrations overlap between the two vendors.
About the author.
Tim Carden is CMO / CTO at RevenueFlow, which builds and operates outbound revenue engines for B2B companies. Studied at McGill University.
Tim Carden · CMO / CTO
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