AiSDR vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
Compare AiSDR (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.
AiSDR is a sales engagement platform built for multi-channel outreach and engagement tracking, starting at $250/mo, while TheirStack is a data enrichment tool for B2B lead data and contact enrichment, with a free entry tier. They solve different jobs, so many teams run both rather than choosing one over the other.
Key takeaways
- AiSDR's Solo plan costs $250/mo for 200 AI-researched contacts per month, 1 domain, 3 mailboxes and 1 LinkedIn account.
- TheirStack offers a Free plan with 50 company credits and 200 API credits per month, making it the lower entry point at $0/mo.
- TheirStack's API, Webhooks and MCP plan costs $49/mo for 1,500 API credits per month.
- TheirStack offers 4 pricing tiers compared to AiSDR's 3 tiers, giving more granularity as teams scale.
- AiSDR integrates with HubSpot, Salesforce, Gmail, Microsoft Outlook, Aircall, Calendly and LinkedIn, while TheirStack integrates with Clay, LinkedIn Audiences, Make, N8N and Zapier.
Reviewed and updated September 5, 2026
AiSDR vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
AiSDR (sales engagement platform) and TheirStack (data enrichment tool) sit next to each other in many outbound stacks. They are not substitutes for each other on every job, so this comparison covers pricing, features, and integrations for each and points out where the two meet.
The Quick Answer
AiSDR 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, AiSDR lists ai-researched emails and linkedin actions on autopilot and ami ai gtm agent for strategy and campaign building, and TheirStack lists job search and company search.
TheirStack offers a lower entry point at $0/mo compared to AiSDR at $250/mo.
If your priority is coordinating outreach across email, phone, and social channels, AiSDR 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
AiSDR is AI SDR platform whose agent researches prospects and runs email and LinkedIn outreach on autopilot, with turnkey mailbox setup and warmup, inbox rotation and two-way CRM sync.
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
Solo
Free
AiSDR Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Solo | $250/mo | 200 AI-researched contacts/month | 1 domain, 3 mailboxes, 1 LinkedIn account |
| Explore | $900/mo | 800 AI-researched contacts/month | 2 domains, 6 mailboxes, 5 LinkedIn accounts |
| Scale | $2500/mo | 2,500 AI-researched contacts/month | 6 domains, 18 mailboxes, 20 LinkedIn accounts |
Source: AiSDR 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 $250/mo). Teams watching their budget will appreciate the savings, especially when starting out.
TheirStack offers 4 pricing tiers compared to AiSDR'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
- AI-researched emails and LinkedIn actions on autopilot
- Ami AI GTM agent for strategy and campaign building
- Unlimited AI personas
- Turnkey email setup and warmup
- Automated inbox rotation with domain health tracking
- Native two-way HubSpot CRM sync
- and 4 more listed below
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- and 2 more listed below
AiSDR Key Features
- AI-researched emails and LinkedIn actions on autopilot
- Ami AI GTM agent for strategy and campaign building
- Unlimited AI personas
- Turnkey email setup and warmup
- Automated inbox rotation with domain health tracking
- Native two-way HubSpot CRM sync
- Native two-way Salesforce CRM sync
- LinkedIn signals for post engagement, profile visits and keyword tracking
- AI videos in messages and AI voice notes in LinkedIn messages
- Website visitor tracking, enrichment and outreach
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 AiSDR
- AI-researched emails and LinkedIn actions on autopilot
- Ami AI GTM agent for strategy and campaign building
- Unlimited AI personas
- Turnkey email setup and warmup
- Automated inbox rotation with domain health tracking
- Native two-way HubSpot CRM sync
- Native two-way Salesforce CRM sync
- LinkedIn signals for post engagement, profile visits and keyword tracking
- AI videos in messages and AI voice notes in LinkedIn messages
- Website visitor tracking, enrichment and outreach
Listed only by TheirStack
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
Integration Ecosystem
AiSDR Integrations
AiSDR connects with: HubSpot, Salesforce, Gmail, Microsoft Outlook, Aircall, Calendly, LinkedIn.
TheirStack Integrations
TheirStack connects with: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Integrations listed only by AiSDR: HubSpot, Salesforce, Gmail, Microsoft Outlook, Aircall, Calendly, LinkedIn.
Integrations listed only by TheirStack: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Use Case Recommendations
Best Fit for AiSDR
- Mid-market to enterprise teams with established multi-channel sales outreach and engagement tracking budgets
- Teams that need a wide feature set (10 capabilities listed)
- Organizations with complex tech stacks needing broad integration support (7 integrations)
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 | AiSDR | TheirStack |
|---|---|---|
| Starting Price | $250/mo | Free |
| Top Tier Price | $2500/mo | Contact Sales |
| Total Features Listed | 10 | 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
AiSDR 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 AiSDR starts at $250/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 AiSDR and TheirStack for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between AiSDR and TheirStack?
- AiSDR is a sales engagement platform focused on multi-channel outreach, including AI-researched emails and LinkedIn actions on autopilot, while TheirStack is a data enrichment tool focused on B2B lead data through job search, company search and technographics. They address different parts of the outbound stack rather than competing directly.
- Which tool is cheaper, AiSDR or TheirStack?
- TheirStack is cheaper at entry, offering a Free plan with 50 company credits and 200 API credits per month, compared to AiSDR's Solo plan at $250/mo. TheirStack also has a $49/mo API, Webhooks and MCP plan for teams needing more API credits.
- Can I use AiSDR and TheirStack together?
- Yes, the article notes that many teams run one of each since the platforms serve different needs. AiSDR handles coordinating outreach across email, phone and social channels, while TheirStack handles finding accurate contact data for target accounts.
- What integrations does AiSDR support?
- AiSDR connects with HubSpot, Salesforce, Gmail, Microsoft Outlook, Aircall, Calendly and LinkedIn. These integrations support native two-way CRM sync with HubSpot and Salesforce as well as email and calendar workflows.
- What integrations does TheirStack support?
- TheirStack connects with Clay, LinkedIn Audiences, Make, N8N and Zapier. These integrations focus on data workflows and automation rather than direct CRM or outreach channel connections.
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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