Buzz.ai vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
Compare Buzz.ai (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.
Buzz.ai is a sales engagement platform for multichannel outreach across email, LinkedIn, calls and voicemail drops, priced from $79 per month. TheirStack is a data enrichment tool for job search, company search, and technographic data, offering a free tier with paid plans starting at $49 per month. The two tools solve different problems and often run together in the same stack.
Key takeaways
- Buzz.ai's Core plan costs $79/mo for 500 credits and 1 seat.
- TheirStack's Free plan costs $0/mo and includes 50 company credits and 200 API credits per month.
- TheirStack's API, Webhooks & MCP plan costs $49/mo for 1,500 API credits per month.
- Buzz.ai lists 10 features including multichannel outreach and AI message drafting, while TheirStack lists 8 features including job search and technographics.
- Zapier is the only integration listed by both Buzz.ai and TheirStack.
Reviewed and updated September 4, 2026
Buzz.ai vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
Buzz.ai (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
Buzz.ai 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, Buzz.ai lists multichannel outreach across email, linkedin, calls and voicemail drops and smart campaigns with ai message drafting, and TheirStack lists job search and company search.
TheirStack offers a lower entry point at $0/mo compared to Buzz.ai at $79/mo.
If your priority is coordinating outreach across email, phone, and social channels, Buzz.ai 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
Buzz.ai is AI SDR platform that runs multichannel outreach across email, LinkedIn, calls and voicemail drops, sequencing touches by prospect engagement, with built-in data search, enrichment and 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
Core
Free
Buzz.ai Pricing (as of September 2026)
| Plan | Price | Contacts |
|---|---|---|
| Core | $79/mo | 500 credits/mo, 1 seat |
| AI Employee | $695/mo | 5,000 credits/mo, 1 seat |
| Enterprise | Contact Sales | 25,000 credits/mo, 5 seats included |
Source: Buzz.ai 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 $79/mo). Teams watching their budget will appreciate the savings, especially when starting out.
TheirStack offers 4 pricing tiers compared to Buzz.ai'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
- Multichannel outreach across email, LinkedIn, calls and voicemail drops
- Smart campaigns with AI message drafting
- Campaign creation from a single prompt
- Phone calling and voicemail drops
- Connection booster and InMail booster
- AI targeting
- and 4 more listed below
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- and 2 more listed below
Buzz.ai Key Features
- Multichannel outreach across email, LinkedIn, calls and voicemail drops
- Smart campaigns with AI message drafting
- Campaign creation from a single prompt
- Phone calling and voicemail drops
- Connection booster and InMail booster
- AI targeting
- Unlimited data enrichment
- Email automation with an AI email service
- Social search across profiles, posts, events and groups
- Residential proxy and link tracking
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 Buzz.ai
- Multichannel outreach across email, LinkedIn, calls and voicemail drops
- Smart campaigns with AI message drafting
- Campaign creation from a single prompt
- Phone calling and voicemail drops
- Connection booster and InMail booster
- AI targeting
- Unlimited data enrichment
- Email automation with an AI email service
- Social search across profiles, posts, events and groups
- Residential proxy and link tracking
Listed only by TheirStack
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
Integration Ecosystem
Buzz.ai Integrations
Buzz.ai connects with: Salesforce, HubSpot, Pipedrive, Calendly, Zapier, Webhooks.
TheirStack Integrations
TheirStack connects with: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Shared Integrations
Both tools integrate with: Zapier.
Integrations listed only by Buzz.ai: Salesforce, HubSpot, Pipedrive, Calendly, Webhooks.
Integrations listed only by TheirStack: Clay, LinkedIn Audiences, Make, N8N.
Use Case Recommendations
Best Fit for Buzz.ai
- Teams that need a wide feature set (10 capabilities listed)
- Organizations with complex tech stacks needing broad integration support (6 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 | Buzz.ai | TheirStack |
|---|---|---|
| Starting Price | $79/mo | Free |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 10 | 8 |
| Integrations | 6 | 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
Buzz.ai 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 Buzz.ai starts at $79/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 Buzz.ai and TheirStack for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Buzz.ai and TheirStack?
- Buzz.ai is a sales engagement platform built for multichannel outreach across email, LinkedIn, calls and voicemail drops, while TheirStack is a data enrichment tool focused on job search, company search, and technographic data. They address different jobs in an outbound stack rather than competing directly.
- How much does Buzz.ai cost?
- Buzz.ai's Core plan costs $79/mo for 500 credits and 1 seat. The AI Employee plan costs $695/mo for 5,000 credits and 1 seat, and Enterprise pricing with 25,000 credits and 5 seats included is available by contacting sales.
- Does TheirStack have a free plan?
- Yes, TheirStack's Free plan costs $0/mo and includes 50 company credits and 200 API credits per month. Paid options include a usage-based App plan with credit packs from 1,000 to 200,000, and an API, Webhooks & MCP plan at $49/mo for 1,500 API credits per month.
- Which integrations do Buzz.ai and TheirStack share?
- Zapier is the only integration listed by both platforms. Buzz.ai also connects with Salesforce, HubSpot, Pipedrive, Calendly, and Webhooks, while TheirStack additionally connects with Clay, LinkedIn Audiences, Make, and N8N.
- Should I use both Buzz.ai and TheirStack together?
- Many teams do run one of each, since Buzz.ai handles multichannel outreach coordination while TheirStack handles finding accurate contact and company data. Buzz.ai fits teams needing a wide feature set and broad integrations, while TheirStack fits budget-conscious teams that want to start free and scale.
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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