Qualifier.ai vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
Compare Qualifier.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.
Qualifier.ai is a sales engagement platform built around an AI assistant called Qai that runs multi-channel outreach sequences across email, phone, and LinkedIn, while TheirStack is a data enrichment tool that finds companies by technologies used and roles hiring, with a free entry tier. Teams focused on outreach coordination fit Qualifier.ai; teams needing contact and company data fit TheirStack, and many run both.
Key takeaways
- Qualifier.ai uses a single Contact Sales pricing plan with no published entry price.
- TheirStack's free tier includes 50 company credits and 200 API credits per month.
- TheirStack's API, Webhooks and MCP plan costs $49 per month for 1,500 API credits.
- Qualifier.ai lists 8 integrations including Gmail, Outlook, Salesforce, HubSpot, and Pipedrive.
- TheirStack lists 5 integrations including Clay, LinkedIn Audiences, Make, N8N, and Zapier.
Reviewed and updated September 5, 2026
Qualifier.ai vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
Sales teams building an outbound stack often weigh Qualifier.ai, 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
Qualifier.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, Qualifier.ai lists qai, your ai sales assistant and multi-channel sequences, and TheirStack lists job search and company search.
TheirStack publishes an entry price of $0/mo; Qualifier.ai uses custom pricing, so the two cannot be compared on list price.
If your priority is coordinating outreach across email, phone, and social channels, Qualifier.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
Qualifier.ai is Automated outbound sales platform built around an AI assistant called Qai that finds prospects, verifies contacts and runs multi-channel sequences combining email, phone and LinkedIn steps. Replies are detected and categorized automatically, and prospect data and verification are included rather than metered.
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
Single plan
Free
Qualifier.ai Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Single plan | Contact Sales | Priced on prospects worked per month and number of users | Monthly volume of new prospects is set in the agreement; nothing metered separately |
Source: Qualifier.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
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 Qualifier.ai's 1, giving you more granularity as you scale.
TheirStack includes a free tier, which is helpful for evaluating the platform without upfront cost.
Features Breakdown
- Qai, your AI sales assistant
- Multi-channel sequences
- Email verification and deduplication
- Deliverability protection with smart pacing
- Smart follow-ups that stop on reply
- Reply detection and categorization
- and 2 more listed below
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- and 2 more listed below
Qualifier.ai Key Features
- Qai, your AI sales assistant
- Multi-channel sequences
- Email verification and deduplication
- Deliverability protection with smart pacing
- Smart follow-ups that stop on reply
- Reply detection and categorization
- All inbox and CRM integrations
- GDPR compliant, data stored in the EU
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 Qualifier.ai
- Qai, your AI sales assistant
- Multi-channel sequences
- Email verification and deduplication
- Deliverability protection with smart pacing
- Smart follow-ups that stop on reply
- Reply detection and categorization
- All inbox and CRM integrations
- GDPR compliant, data stored in the EU
Listed only by TheirStack
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
Integration Ecosystem
Qualifier.ai Integrations
Qualifier.ai connects with: Gmail, Outlook, Salesforce, HubSpot, Pipedrive, Microsoft Dynamics 365, Upsales, Lime Go.
TheirStack Integrations
TheirStack connects with: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Integrations listed only by Qualifier.ai: Gmail, Outlook, Salesforce, HubSpot, Pipedrive, Microsoft Dynamics 365, Upsales, Lime Go.
Integrations listed only by TheirStack: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Use Case Recommendations
Best Fit for Qualifier.ai
- Organizations with complex tech stacks needing broad integration support (8 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
- SDR teams running multi-channel outreach sequences
- Sales managers tracking team engagement metrics
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 | Qualifier.ai | TheirStack |
|---|---|---|
| Starting Price | Contact Sales | Free |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 8 | 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
Qualifier.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 publishes an entry price (a free tier), while Qualifier.ai 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 Qualifier.ai and TheirStack for current information.
Frequently asked questions.
Frequently asked questions- What's the main difference between Qualifier.ai and TheirStack?
- Qualifier.ai is a sales engagement platform for multi-channel sales outreach and engagement tracking, while TheirStack is a data enrichment tool for B2B lead data and contact enrichment. Qualifier.ai centers on an AI assistant called Qai running outreach sequences, while TheirStack focuses on finding companies by technologies used and roles hiring.
- How much does Qualifier.ai cost compared to TheirStack?
- Qualifier.ai uses custom, Contact Sales pricing with a single plan and no published list price. TheirStack publishes an entry price of $0 per month for its free tier, plus a usage-based App plan, a $49 per month API, Webhooks and MCP plan, and a Contact Sales Datasets plan, giving it 4 pricing tiers total.
- Does TheirStack have a free plan?
- Yes, TheirStack offers a free tier that includes 50 company credits and 200 API credits per month. This makes it possible to evaluate the platform without upfront cost, unlike Qualifier.ai, which requires contacting sales for a quote.
- Which integrations does each platform support?
- Qualifier.ai connects with Gmail, Outlook, Salesforce, HubSpot, Pipedrive, Microsoft Dynamics 365, Upsales, and Lime Go, totaling 8 integrations. TheirStack connects with Clay, LinkedIn Audiences, Make, N8N, and Zapier, totaling 5 integrations.
- Should a sales team use both Qualifier.ai and TheirStack?
- Many teams do run one of each since the tools cover different parts of the outbound workflow. Qualifier.ai handles coordinating outreach across email, phone, and social channels, while TheirStack handles finding accurate contact data for target accounts, so combining them covers both data and outreach needs.
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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