Apollo.io vs Seamless.AI vs ZoomInfo SalesOS vs ZoomInfo Comparison
Apollo.io
Starting at $0 /user/month
- Free Trial
- Large Enterprises
- Medium Business
Apollo is sales engagement software designed for the sales team. When managers view their team through the lens of goal setting and progress tracking, motivation increases across the board. Apollo helps make targets easi…
Seamless.AI
Starting at Contact for pricing
- Large Enterprises
- Medium Business
Seamless.AI is a virtual sales assistant for small to mid-market sales teams in financial services, high-tech, and consulting that automatically aggregates prospect signals from CRM systems, website analytics, email camp…
ZoomInfo SalesOS
Starting at Contact for pricing
- Free Trial
- Medium Business
- Enterprise
ZoomInfo SalesOS is the perfect B2B sales solution for today's market. It provides sales teams with access to the largest, freshest database of company and contact intel, with tools to help progress sales progression. Em…
ZoomInfo
Starting at Contact for pricing
- Free Trial
- Large Enterprises
- Medium Business
ZoomInfo is a powerful software solution that helps grow your business. With its unified system of data, insights, and integrations, it provides complete visibility into your target market and ideal buyers. It uses compr…
Seamless.AI leads on user satisfaction with a 3.9-star rating across 83 reviews.
Apollo.io vs Seamless.AI vs ZoomInfo SalesOS vs ZoomInfo — at a glance
| Feature | Apollo.io | Seamless.AI | ZoomInfo SalesOS | ZoomInfo |
|---|---|---|---|---|
| Rating | 2.8 / 5 | 3.9 / 5 | — | 4.4 / 5 |
| Reviews | 5,090 | 83 | — | 11,295 |
| Starting price | $0 /user/month | Contact for pricing | Contact for pricing | Contact for pricing |
| Free trial | Yes | No | Yes | Yes |
| Free version | No | No | No | No |
| Best for | Large Enterprises, Medium Business, Small Business | Large Enterprises, Medium Business, Small Business | Medium Business, Enterprise | Large Enterprises, Medium Business, Small Business |
| Category | Sales Engagement Software | Sales Intelligence Software | Sales Intelligence Software | Sales Intelligence Software |
| Integrations | 9+ apps | — | — | — |
| Platforms | SaaS/Web/Cloud | SaaS/Web/Cloud | SaaS/Web/Cloud | SaaS/Web/Cloud, Mobile - Android |
| API | Available | — | — | Available |
| Support modes | Business Hours, Online | Online | — | Business Hours, Online |
| Certifications | SOC 2, GDPR | — | SOC 2 | SOC 2 |
| Data residency | US | US | US | US |
Key differences between Apollo.io and Seamless.AI
- Pricing: Apollo.io starts at $0 /user/month. Seamless.AI pricing is not publicly listed.
- Free trial: Apollo.io offers a free trial; Seamless.AI does not.
- User satisfaction: Seamless.AI scores higher with a 3.9-star average.
- Deployment: Apollo.io supports SaaS/Web/Cloud; Seamless.AI supports SaaS/Web/Cloud.
Compare Apollo.io vs Seamless.AI vs ZoomInfo SalesOS vs ZoomInfo — and walk away knowing which one fits.
Which tool fits your team best
Which is actually cheaper for your team size
Where each product wins, per real buyers
Most Sales Engagement Software tools look identical on paper. This comparison cuts to the differences that matter — pricing structure, team fit, and what real buyers found after signing up.
Biggest differences
Features
Pricing
Buying details
Security
Buyer feedback
Integrations
Product tour
Other options
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Biggest differences
Start here before you go deeper into features.
Best for sales teams needing accurate contact data and integrated sales intelligence.
- You require highly accurate and reliable contact information for outreach.
- Your sales team benefits from strong CRM integrations for pipeline visibility.
- You want comprehensive sales intelligence combining data, analytics, and automation.
- Your company needs extensive third-party app integrations beyond Apollo’s limited marketplace.
- You are a new user without dedicated onboarding support who may struggle with complexity.
Large Enterprises, Medium Business, Small Business
Medium Business, Enterprise
Large Enterprises, Medium Business, Small Business
Apollo.io typically suits Large Enterprises and Medium Business. Seamless.AI tends to fit Large Enterprises and Medium Business better. The right choice depends on your team size, workflow, and whether a free trial matters.
Description | Apollo is sales engagement software designed for the sales team. When managers view their team through the lens of goal setting and progress tracking, motivation increases across the board. ... Read More about Apollo.io | Seamless.AI is a virtual sales assistant for small to mid-market sales teams in financial services, high-tech, and consulting that automatically aggregates prospect signals from CRM ... Read More about Seamless.AI | ZoomInfo SalesOS is the perfect B2B sales solution for today's market. It provides sales teams with access to the largest, freshest database of company and contact intel, with tools to help ... Read More about ZoomInfo SalesOS | ZoomInfo is a powerful software solution that helps grow your business. With its unified system of data, insights, and integrations, it provides complete visibility into your target market ... Read More about ZoomInfo |
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Spotsaas ScoreWhat's this? ↗ | 9.6/10 | Not Available | Not Available | Not Available |
User RatingsBased on verified Spotsaas reviews | ||||
Best Company Size | 10-50 employees51-5,000+ employees | — | 50 to 5,000 employees | 1-5,000 employees |
Get pricing help | Get pricing help |
Where each option fits best
See where each product is strongest, which teams it fits, and what causes buyers to keep looking — before you commit.
Based on buyer reviews and verified product data collected by Spotsaas.
Key strengths
- Seamless CRM Alignment: Apollo.io integrates with CRMs like Salesforce and HubSpot to sync contacts, activities, and engagement data. This keeps prospecting aligned with pipeline tracking and revenue reporting. Teams benefit from cleaner data, better visibility across departments, and smoother collaboration between sales development and account executives.
- Data-Driven Sales Decisions: Apollo.io provides visibility into email engagement, calls, meetings, and conversion activity. Sales managers can review performance trends, identify effective messaging, and adjust outreach strategies using real usage data. These insights help improve prioritization, refine campaigns, and align sales efforts with measurable outcomes.
- Scalable Outbound Automation: Apollo.io supports scalable outbound efforts through sequences, automated follow-ups, and task scheduling. Teams can maintain steady outreach volume while keeping messages structured and timely. This setup supports growing sales teams by reducing repetitive work and helping reps handle larger lead volumes without losing consistency.
No key benefits available yet.
- Lead Generation: ZoomInfo SalesOS lets you uncover high-quality leads through its database of millions of contacts and companies, making your outreach more targeted and efficient.
- Data Enrichment: You can enrich your existing CRM data easily. SalesOS integrates with your current systems to provide real-time updates and insights, keeping your team informed with accurate information.
- Advanced Search Filters: The platform’s advanced search capabilities allow you to drill down into specific demographics, industries, and company sizes. This means that when you’re strategizing your next campaign, you can confidently target the right audience.
- Data Access: ZoomInfo gives your teams access to an extensive database of business contacts and company information, letting them make informed decisions and improve their outreach efforts.
- Lead Generation: Your sales team can identify high-quality leads using ZoomInfo's search capabilities. Filter prospects by specific criteria to focus on the most promising opportunities.
- Easy Integration: ZoomInfo integrates smoothly with popular CRM platforms like Salesforce and HubSpot. This means you can simplify your workflows and keep your data synchronized without any hassle.
Best fit
- 10–5,000+ employees
- SaaS, Technology, IT Services, Marketing & Advertising, Fintech, E-commerce, Consulting, B2B Services, Software Development, Startups
- Sales Development Representative, Business Development Manager, Account Executive, Sales Manager, Growth Manager, Revenue Operations Manager, Marketing Manager, Founder, Head of Sales
No best-fit guidance available yet.
- 50 to 5,000 employees
- Martech, Revtech, Fintech, Sales Automation, SaaS, and Consulting
- Sales Managers, Account Executives, Business Development Representatives, and CRM Administrators
- 1-5,000 employees
- Martech, Revtech, Fintech, Sales Automation, SaaS, Consulting
- Sales Managers, Account Executives, Business Development Representatives, CRM Administrators
Reasons buyers look elsewhere
- Lacks workflow customization — teams with complex sales processes or unique CRM setups typically switch to Pipedrive or HubSpot
- No built-in email deliverability monitoring — high-volume outbound teams often add Lemlist or Instantly for reputation management and warm-up controls
- Limited database coverage in specific regions and industries — teams targeting localized markets or niche verticals often use Hunter.io or RocketReach instead
No alternatives guidance available yet.
- Pricing exceeds budgets for startups and small businesses under 50 employees — competitors like HubSpot and Pipedrive offer lower entry points
- Interface requires training for new users — teams switching from Salesforce or simpler CRMs often cite learning curve as a barrier
- Data residency requirements in EU or APAC regions may conflict with ZoomInfo's data centers — compliance-focused enterprises choose Salesforce or Microsoft Dynamics instead
- Pricing is higher than competitors like Hunter.io or RocketReach, which offer similar B2B contact data at 40-60% lower cost for teams under 50 people
- Missing vertical-specific data fields that industry-focused tools like Apollo.io or Clearbit provide for healthcare, fintech, or manufacturing buyers
- Interface requires more clicks to find contacts than competitors; users switching to Hunter.io or Seamless.ai report faster prospecting workflows
Software Demo
Demo |  Seamless.AI has not given any software demo yet If you're the owner of this profile, add your demo.Contact us |
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How do Apollo.io, Seamless.AI, ZoomInfo SalesOS and ZoomInfo Compare on Features?
Total Features | 13 Features | 0 Features | 0 Features | 0 Features |
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Unique Features | No unique features | No features | No features | No features |
Get Quote | Get Quote |
Compare Apollo.io, Seamless.AI, ZoomInfo SalesOS and ZoomInfo on pricing
Review starting price, plan structure, and free-trial access side by side so you can see which option fits your budget and buying process.
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Other Details
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Get help choosing | Get help choosing |
Security & Compliance
Certifications, data handling, and security controls for IT and compliance evaluators.
SOC 2 | ✓ Yes | — |
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HIPAA | ✗ No | ✗ No |
GDPR | ✓ Yes | — |
Single Sign-On (SSO) | ✓ Yes | — |
Multi-Factor Auth (MFA) | ✓ Yes | — |
Data Encryption | ✓ Yes | — |
Data Residency | 🇺🇸 US | 🇺🇸 US |
Apollo.io vs Seamless.AI vs ZoomInfo SalesOS User Reviews & Rating Comparison
User Ratings | No reviews available for the product | |||
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Rating Distribution | ||||
Spotsaas Editor’s POV generated by AI | Buyer sentiment Buyers appreciate Apollo.io’s accurate data and ease of use but express concerns about onboarding complexity and limited integration options. What buyers like
Common complaints
| Buyer sentiment Buyer sentiment is mixed to positive across 25 reviews, with clear strengths and a few common watchouts. What buyers like
Common complaints
| What buyers like
Common complaints
| Buyer sentiment Buyer sentiment is positive across 2490 reviews, with strong overall satisfaction. What buyers like
Common complaints
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Pros and Cons |
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Positive Reviews | No reviews available for the product | No reviews available for the product | No reviews available for the product | No reviews available for the product |
| Negative Reviews | No reviews available for the product | No reviews available for the product | No reviews available for the product | No reviews available for the product |
Integrations
Integration with other apps | No Integration information available. | No Integration information available. | No Integration information available. |
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List of Customers
Customers |  EY  Colliers International  GoDaddy | No Customers information available. | No Customers information available. | No Customers information available. |
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Media and Screenshots
Screenshots |  3 Screenshots | No screenshots available. |
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Videos | No videos available. | No videos available. |
Alternatives
Alternatives |
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Disclaimer: This research has been collated from a variety of authoritative sources. We welcome your feedback at [email protected].
Frequently asked questions
- Which is better, Apollo.io or Seamless.AI?
- Seamless.AI edges out the other on user ratings (3.9 vs 2.8). That said, the best pick depends on your use case — use the comparison tables above to evaluate each dimension.
- Do Apollo.io and Seamless.AI offer a free trial?
- Apollo.io offers a free trial. Seamless.AI does not.
- What is the starting price of Apollo.io vs Seamless.AI?
- Apollo.io starts at $0 /user/month. Seamless.AI starts at Contact for pricing.
- What are the top alternatives to Apollo.io?
- Top alternatives to Apollo.io include AroundDeal, CrankWheel, ZoomInfo Engage, Outreach, Adapt Engage.
- What are the top alternatives to Seamless.AI?
- Top alternatives to Seamless.AI include ZoomInfo SalesOS, ZoomInfo, Winmo, RevBoss, Intricately.