Closely vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
Compare Closely (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.
Closely is a sales engagement platform for multi-channel outreach across LinkedIn and email starting at $49/mo, while TheirStack is a data enrichment tool for B2B lead and company data with a free tier and a $49/mo API plan. Closely fits teams coordinating outreach, TheirStack fits teams finding accurate contact and company data, and many teams use both.
Key takeaways
- Closely's Starter plan costs $49/mo and includes 1 LinkedIn account plus unlimited email accounts.
- TheirStack offers a Free plan with 50 company credits and 200 API credits per month.
- TheirStack's API, Webhooks and MCP plan costs $49/mo for 1,500 API credits per month.
- Closely lists 10 key features including a conditional sequence builder, LinkedIn account warmup, and AI lead scoring agents.
- Closely integrates with Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook, SMTP, and Webhooks, while TheirStack integrates with Clay, LinkedIn Audiences, Make, N8N, and Zapier.
Reviewed and updated September 4, 2026
Closely vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
Sales teams building an outbound stack often weigh Closely, a sales engagement platform for multi-channel sales outreach and engagement tracking, against TheirStack, a data enrichment tool for B2B lead data and contact enrichment. They cover different parts of the workflow, so this comparison covers what each one does, what each one costs, and where they overlap.
The Quick Answer
Closely 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, Closely lists multichannel campaigns across linkedin and email and conditional sequence builder, and TheirStack lists job search and company search.
TheirStack offers a lower entry point at $0/mo compared to Closely at $49/mo.
If your priority is coordinating outreach across email, phone, and social channels, Closely 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
Closely is Outbound platform that runs automated campaigns across LinkedIn and email from a shared sender, with a conditional sequence builder, unified inbox, contact enrichment and AI personalization agents.
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
Starter
Free
Closely Pricing (as of September 2026)
| Plan | Price | Contacts |
|---|---|---|
| Starter | $49/mo | 1 LinkedIn account, unlimited email accounts |
| Growth | $127/mo | 3 LinkedIn accounts, unlimited email accounts, 3,000 bonus credits/mo |
| Essential | $205/mo | 5 LinkedIn accounts, unlimited email accounts, 5,000 bonus credits/mo |
| Custom | Contact Sales | Unlimited seats, custom LinkedIn accounts and credits |
Source: Closely 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
TheirStack offers the lower entry point ($0/mo vs $49/mo). Teams watching their budget will appreciate the savings, especially when starting out.
TheirStack includes a free tier, which is helpful for evaluating the platform without upfront cost.
Features Breakdown
- Multichannel campaigns across LinkedIn and email
- Conditional sequence builder
- Smart Inbox unifying LinkedIn and email replies
- LinkedIn account warmup
- Dedicated residential IP for each LinkedIn account
- OAuth Gmail and Outlook connection plus custom SMTP
- and 4 more listed below
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- and 2 more listed below
Closely Key Features
- Multichannel campaigns across LinkedIn and email
- Conditional sequence builder
- Smart Inbox unifying LinkedIn and email replies
- LinkedIn account warmup
- Dedicated residential IP for each LinkedIn account
- OAuth Gmail and Outlook connection plus custom SMTP
- Email finder with a multi-step fallback process
- Phone number finder
- AI lead scoring and personalization agents
- Export from Sales Navigator, LinkedIn posts and events
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 Closely
- Multichannel campaigns across LinkedIn and email
- Conditional sequence builder
- Smart Inbox unifying LinkedIn and email replies
- LinkedIn account warmup
- Dedicated residential IP for each LinkedIn account
- OAuth Gmail and Outlook connection plus custom SMTP
- Email finder with a multi-step fallback process
- Phone number finder
- AI lead scoring and personalization agents
- Export from Sales Navigator, LinkedIn posts and events
Listed only by TheirStack
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
Integration Ecosystem
Closely Integrations
Closely connects with: Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook, SMTP, Webhooks.
TheirStack Integrations
TheirStack connects with: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Integrations listed only by Closely: Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook, SMTP, Webhooks.
Integrations listed only by TheirStack: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Use Case Recommendations
Best Fit for Closely
- 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)
- 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 | Closely | TheirStack |
|---|---|---|
| Starting Price | $49/mo | Free |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 10 | 8 |
| Integrations | 8 | 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
Closely 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 offers a more accessible entry point, while Closely starts at $49/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 Closely and TheirStack for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Closely and TheirStack?
- Closely is a sales engagement platform built for multi-channel outreach and engagement tracking across LinkedIn and email, while TheirStack is a data enrichment tool built for finding B2B lead data and enriching contact and company information such as technographics and hiring activity.
- How much does Closely cost compared to TheirStack?
- Closely's entry plan starts at $49/mo for the Starter tier with 1 LinkedIn account and unlimited email accounts. TheirStack has a Free tier with 50 company credits and 200 API credits per month, and a paid API, Webhooks and MCP plan also priced at $49/mo for 1,500 API credits.
- Does TheirStack have a free plan?
- Yes, TheirStack offers a Free plan that includes 50 company credits and 200 API credits per month, which lets teams evaluate the platform without any upfront cost before moving to a usage-based App plan or the paid API tier.
- What integrations does Closely support that TheirStack doesn't?
- Closely lists integrations with Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook, SMTP, and Webhooks, none of which appear on TheirStack's integration list. TheirStack instead lists Clay, LinkedIn Audiences, Make, N8N, and Zapier.
- Should I use Closely and TheirStack together?
- Many teams do use both, since they cover different parts of the outbound workflow: Closely handles multi-channel outreach coordination across email, phone, and social channels, while TheirStack handles finding accurate contact and company data for target accounts.
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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