Inboxy vs Success.ai: Email Warmup Tool vs Cold Email Platform Comparison
Compare Inboxy (email warmup tool) and Success.ai (cold email platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Inboxy is an email warmup tool built for deliverability and sender reputation, priced from $47 a month. Success.ai is a cold email platform for outreach campaigns with a 700 million plus contact database, priced from $49 a month. They solve different jobs, and many teams run both tools together in their outbound stack.
Key takeaways
- Inboxy's entry plan, Inboxy Pro, costs $47 per month and includes 120 daily emails per inbox for Gmail and Office 365 accounts.
- Success.ai's entry plan, Lite, costs $49 per month and includes 5,000 emails per month with warm up on 10 accounts.
- Success.ai offers four pricing tiers, Lite, Starter, Pro, and Enterprise, compared to Inboxy's single Pro plan.
- Success.ai's database includes over 700 million contacts with unlimited look ups.
- Inboxy integrates with nine email related tools including Gmail, Google Workspace, and Custom SMTP, while Success.ai integrates with five tools including Zapier, HubSpot, and Salesforce.
Reviewed and updated September 2, 2026
Inboxy vs Success.ai: Email Warmup Tool vs Cold Email Platform Comparison
Inboxy (email warmup tool) and Success.ai (cold email platform) 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
Inboxy is an email warmup tool for email domain warming and deliverability; Success.ai is a cold email platform for cold email outreach. By each vendor's own wording, Inboxy lists primary inbox supercharger and domain score iq monitoring, and Success.ai lists ai sales & reply operators and 700m+ database with unlimited look-ups.
Inboxy offers a lower entry point at $47/mo compared to Success.ai at $49/mo.
If your priority is building sender reputation and improving inbox placement, Inboxy is the one built for it; for sending campaigns that land in the inbox and generate replies, that is Success.ai. Many teams run one of each.
Understanding the Core Difference
Inboxy is Email warmup tool that improves deliverability by gradually increasing sending volume and boosting domain reputation. It runs warmup through a private network of headless browsers with AI-driven adjustments to sending metrics.
Success.ai is Cold email outreach platform with unlimited email sending accounts, unlimited warmup, a unified inbox and a 700M+ contact B2B database. AI operators write campaigns and draft replies, and a token balance meters data reveals, enrichment and AI actions.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Inboxy Pro
Lite
Inboxy Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Inboxy Pro | $47/mo | Gmail and Office 365 Inboxes | 120 Daily Emails Per Inbox |
Source: Inboxy Pricing
Success.ai Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Lite | $49/mo | 2,000 tokens /mo for reveals, enrichment & AI; 700M+ database with unlimited look-ups | 5K emails /mo with warm-up on 10 accounts |
| Starter | $99/mo | 6,000 tokens /mo for reveals, enrichment & AI; 700M+ database with unlimited look-ups | 50K emails /mo with unlimited warm-up |
| Pro | $199/mo | 10,000 tokens /mo + advanced search filters | 150K emails /mo + advanced deliverability |
| Enterprise | Contact Sales | Custom tokens & unlimited email sending | Custom tokens & unlimited email sending |
Source: Success.ai Pricing
Pricing Analysis
Inboxy is more affordable at the entry level ($47/mo vs $49/mo). For teams with tight budgets or those just getting started with email domain warming and deliverability and cold email outreach, this price difference matters.
Success.ai offers 4 pricing tiers compared to Inboxy's 1, giving you more granularity as you scale.
Features Breakdown
- Primary Inbox Supercharger
- Domain Score IQ Monitoring
- AI Powered Inbox Adjustments
- Dynamic Email Scheduling
- Live Inbox Engagement Feed
- AI Generated Emails (GPT-3)
- and 3 more listed below
- AI Sales & Reply Operators
- 700M+ database with unlimited look-ups
- Unified InboxHub
- Data enrichment & email verification built in
- unlimited warm-up
- advanced search filters
- and 3 more listed below
Inboxy Key Features
- Primary Inbox Supercharger
- Domain Score IQ Monitoring
- AI Powered Inbox Adjustments
- Dynamic Email Scheduling
- Live Inbox Engagement Feed
- AI Generated Emails (GPT-3)
- IP Warm Up Service
- SMTP Warm Up Service
- Inbox Placement Test
Success.ai Key Features
- AI Sales & Reply Operators
- 700M+ database with unlimited look-ups
- Unified InboxHub
- Data enrichment & email verification built in
- unlimited warm-up
- advanced search filters
- advanced deliverability
- Website Visitor identification
- 5 deal pipelines
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 Inboxy
- Primary Inbox Supercharger
- Domain Score IQ Monitoring
- AI Powered Inbox Adjustments
- Dynamic Email Scheduling
- Live Inbox Engagement Feed
- AI Generated Emails (GPT-3)
- IP Warm Up Service
- SMTP Warm Up Service
- Inbox Placement Test
Listed only by Success.ai
- AI Sales & Reply Operators
- 700M+ database with unlimited look-ups
- Unified InboxHub
- Data enrichment & email verification built in
- unlimited warm-up
- advanced search filters
- advanced deliverability
- Website Visitor identification
- 5 deal pipelines
Integration Ecosystem
Inboxy Integrations
Inboxy connects with: Personal Gmail, Google Workspace, Outlook/Office (SMTP), Outlook/Office (Oauth), Mailgun, GoDaddy, Inboxroad, Sendgrid, Custom SMTP.
Success.ai Integrations
Success.ai connects with: Zapier, HubSpot, Salesforce, Pipedrive, Slack.
Integrations listed only by Inboxy: Personal Gmail, Google Workspace, Outlook/Office (SMTP), Outlook/Office (Oauth), Mailgun, GoDaddy, Inboxroad, Sendgrid, Custom SMTP.
Integrations listed only by Success.ai: Zapier, HubSpot, Salesforce, Pipedrive, Slack.
Use Case Recommendations
Best Fit for Inboxy
- Budget-conscious teams looking for an affordable email warmup tool
- Organizations with complex tech stacks needing broad integration support (9 integrations)
- Teams launching new email domains for outreach
- Organizations recovering from deliverability issues
Best Fit for Success.ai
- Budget-conscious teams looking for an affordable cold email platform
- Enterprise buyers who prefer custom pricing and dedicated support
- Sales teams running high-volume outbound email campaigns
- Agencies managing multiple client outreach programs
Feature Comparison Summary
| Feature | Inboxy | Success.ai |
|---|---|---|
| Starting Price | $47/mo | $49/mo |
| Top Tier Price | $47/mo | Contact Sales |
| Total Features Listed | 9 | 9 |
| Integrations | 9 | 5 |
Getting Started Checklist
- Define your email domain warming and deliverability and cold email outreach requirements and monthly budget
- Estimate your expected warmup email volume and email sending volume 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
Inboxy serves the email domain warming and deliverability side of an outbound stack and Success.ai the cold email outreach side. Inboxy offers a more accessible entry point at $47/mo, while Success.ai 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 Inboxy and Success.ai for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Inboxy and Success.ai?
- Inboxy is an email warmup tool focused on deliverability and sender reputation, while Success.ai is a cold email platform for sending outreach campaigns. Inboxy gradually increases sending volume to boost domain reputation, whereas Success.ai provides a 700 million plus contact database, AI sales operators, and campaign sending tools.
- Which tool is cheaper, Inboxy or Success.ai?
- Inboxy is cheaper at the entry level, priced at $47 per month compared to Success.ai's Lite plan at $49 per month. Success.ai offers more pricing tiers though, Starter at $99 per month, Pro at $199 per month, and Enterprise pricing on request, for teams that need to scale.
- Can I use both Inboxy and Success.ai together?
- Yes, many teams use both tools since they serve different purposes in an outbound stack. Inboxy handles email warmup and deliverability, while Success.ai handles cold email campaign sending, contact data, and reply automation.
- What integrations does each platform support?
- Inboxy integrates with nine email related tools including Personal Gmail, Google Workspace, Outlook or Office via SMTP and OAuth, Mailgun, GoDaddy, Inboxroad, Sendgrid, and Custom SMTP. Success.ai integrates with five tools: Zapier, HubSpot, Salesforce, Pipedrive, and Slack.
- How many pricing tiers does Success.ai offer compared to Inboxy?
- Success.ai offers four pricing tiers: Lite at $49 per month, Starter at $99 per month, Pro at $199 per month, and Enterprise at custom pricing. Inboxy offers a single Pro plan priced at $47 per month.
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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