TheirStack vs Zeliq: Data Enrichment Tool vs Sales Engagement Platform Comparison
Compare TheirStack (data enrichment tool) and Zeliq (sales engagement platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
TheirStack is a data enrichment tool for B2B lead data and contact enrichment, while Zeliq is a sales engagement platform for multichannel outreach and engagement tracking. Both start free at $0/mo. TheirStack fits teams needing accurate contact and company data; Zeliq fits teams coordinating outreach across email, phone, and social channels. Many teams use both.
Key takeaways
- TheirStack and Zeliq both offer free plans starting at $0 per month.
- TheirStack's API, Webhooks and MCP plan costs $49/mo for 1,500 API credits per month.
- Zeliq's Starter plan costs $59/mo for 750 credits per month, covering 75 phone numbers or 750 emails.
- TheirStack offers 4 pricing tiers while Zeliq offers 3, giving TheirStack more granularity as usage scales.
- TheirStack integrates with Clay, LinkedIn Audiences, Make, N8N, and Zapier, while Zeliq integrates with HubSpot, Salesforce, Pipedrive, Aircall, Ringover, Gmail, Microsoft, and API.
Reviewed and updated September 5, 2026
TheirStack vs Zeliq: Data Enrichment Tool vs Sales Engagement Platform Comparison
TheirStack is a data enrichment tool; Zeliq is a sales engagement platform. Whether you need one, the other, or both depends on which part of the workflow you are buying for: B2B lead data and contact enrichment on one side, multi-channel sales outreach and engagement tracking on the other. This guide lays out what each vendor publishes.
The Quick Answer
TheirStack is a data enrichment tool for B2B lead data and contact enrichment; Zeliq is a sales engagement platform for multi-channel sales outreach and engagement tracking. By each vendor's own wording, TheirStack lists job search and company search, and Zeliq lists multichannel sequences across email, call and social and lead search with basic and advanced filters.
Both start at the same price point ($0/mo), so the decision comes down to features and workflow fit.
If your priority is finding accurate contact data for target accounts, TheirStack is the one built for it; for coordinating outreach across email, phone, and social channels, that is Zeliq. Many teams run one of each.
Understanding the Core Difference
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.
Zeliq is Sales prospecting and engagement platform that combines a lead search and waterfall enrichment hub with multichannel sequences across email, calls and social, plus a connected dialer and CRM sync.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
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
Zeliq Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Basic | Free | Import up to 100 leads per month | Run 2 active sequences (emails only) |
| Starter | $59/mo | 750 credits / month | 75 phone numbers or 750 emails |
| Custom | Contact Sales | Starts as from 24k credits/user/year | - |
Source: Zeliq Pricing
Pricing Analysis
Both platforms start at the same $0/mo price point. The decision comes down to which feature set and tier structure works better for your expected usage.
TheirStack offers 4 pricing tiers compared to Zeliq's 3, giving you more granularity as you scale.
Both platforms offer free tiers, so you can test each one before spending anything.
Features Breakdown
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- and 2 more listed below
- Multichannel sequences across email, call and social
- Lead search with basic and advanced filters
- Enrichment Hub with waterfall enrichment
- Chrome extension for enrichment
- Lead engagement scoring
- Dialer connection for calling from the platform
- and 4 more listed below
TheirStack Key Features
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
Zeliq Key Features
- Multichannel sequences across email, call and social
- Lead search with basic and advanced filters
- Enrichment Hub with waterfall enrichment
- Chrome extension for enrichment
- Lead engagement scoring
- Dialer connection for calling from the platform
- Social automation
- SDR and manager cockpits for reporting
- Two-way CRM integration to pull and push records
- Enrichment API
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 TheirStack
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
Listed only by Zeliq
- Multichannel sequences across email, call and social
- Lead search with basic and advanced filters
- Enrichment Hub with waterfall enrichment
- Chrome extension for enrichment
- Lead engagement scoring
- Dialer connection for calling from the platform
- Social automation
- SDR and manager cockpits for reporting
- Two-way CRM integration to pull and push records
- Enrichment API
Integration Ecosystem
TheirStack Integrations
TheirStack connects with: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Zeliq Integrations
Zeliq connects with: HubSpot, Salesforce, Pipedrive, Aircall, Ringover, Gmail, Microsoft, API.
Integrations listed only by TheirStack: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Integrations listed only by Zeliq: HubSpot, Salesforce, Pipedrive, Aircall, Ringover, Gmail, Microsoft, API.
Use Case Recommendations
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
Best Fit for Zeliq
- Budget-conscious teams looking for an affordable sales engagement platform
- Teams that need a wide feature set (10 capabilities listed)
- Organizations with complex tech stacks needing broad integration support (8 integrations)
- 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 | TheirStack | Zeliq |
|---|---|---|
| Starting Price | Free | Free |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 8 | 10 |
| Integrations | 5 | 8 |
| Founded | 2021 | N/A |
Getting Started Checklist
- Define your B2B lead data and contact enrichment and multi-channel sales outreach and engagement tracking requirements and monthly budget
- Estimate your expected data credits or contact lookups and sequences and engagement actions 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
TheirStack serves the B2B lead data and contact enrichment side of an outbound stack and Zeliq the multi-channel sales outreach and engagement tracking side. TheirStack offers a more accessible entry point, while Zeliq starts at $0/mo. 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 TheirStack and Zeliq for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between TheirStack and Zeliq?
- TheirStack is a data enrichment tool focused on B2B lead data and contact enrichment, offering job search and company search. Zeliq is a sales engagement platform focused on multi-channel outreach and engagement tracking, offering multichannel sequences across email, call and social, plus lead search with basic and advanced filters.
- Which is cheaper, TheirStack or Zeliq?
- Both platforms offer a free plan starting at $0 per month, so neither is cheaper at the entry level. Beyond free, TheirStack's API, Webhooks and MCP plan is $49/mo for 1,500 API credits, while Zeliq's Starter plan is $59/mo for 750 credits covering 75 phone numbers or 750 emails.
- Can I use both TheirStack and Zeliq together?
- Yes, the article notes that many teams run one of each. TheirStack handles finding accurate contact data for target accounts, and Zeliq handles coordinating outreach across email, phone, and social channels, so they can complement each other in a workflow.
- What integrations does each platform support?
- TheirStack connects with Clay, LinkedIn Audiences, Make, N8N, and Zapier. Zeliq connects with HubSpot, Salesforce, Pipedrive, Aircall, Ringover, Gmail, Microsoft, and API, giving it a broader set of eight listed integrations compared to TheirStack's five.
- Who is Zeliq best suited for?
- Zeliq is best suited for budget-conscious teams seeking an affordable sales engagement platform, teams needing a wide feature set with 10 listed capabilities, and organizations with complex tech stacks that need broad integration support across 8 integrations. It also fits teams wanting to start free and scale, or enterprise buyers preferring custom pricing.
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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