MailRush.io vs Success.ai: Cold Email Platform Comparison
Compare MailRush.io and Success.ai side by side. See pricing, features, and integrations to choose the right cold email platform for your needs.
MailRush.io starts at $19/month while Success.ai starts at $49/month, and the two platforms take different approaches: MailRush.io lists unlimited senders and unlimited email warming built into every plan, while Success.ai lists AI sales and reply operators plus a 700M+ contact database with unlimited look-ups. The right choice depends on budget, team size, and required capabilities.
Key takeaways
- MailRush.io's Starter plan costs $19 per month for up to 1,000 contacts and up to 5,000 emails per month.
- Success.ai's Lite plan costs $49 per month and includes 2,000 tokens per month for reveals, enrichment, and AI plus warm-up on 10 accounts.
- Success.ai offers four pricing tiers, Lite, Starter, Pro, and Enterprise, compared to MailRush.io's three tiers, Starter, Pro, and Scale.
- MailRush.io lists integrations with SMTP, IMAP, Zapier, and Webhooks, while Success.ai lists integrations with Zapier, HubSpot, Salesforce, Pipedrive, and Slack.
- Zapier is the only integration listed by both MailRush.io and Success.ai.
Reviewed and updated September 2, 2026
MailRush.io vs Success.ai: Cold Email Platform Comparison
MailRush.io and Success.ai are both cold email platforms. Choosing between them depends on your team size, budget, and specific cold email outreach requirements. Here is what each vendor publishes about pricing, features, and integrations.
The Quick Answer
By each vendor's own wording, MailRush.io lists unlimited senders and unlimited email warming, while Success.ai lists ai sales & reply operators and 700m+ database with unlimited look-ups. A capability both offer can appear under different names, so read both feature lists below.
MailRush.io offers a lower entry point at $19/mo compared to Success.ai at $49/mo.
If your priority is sending campaigns that land in the inbox and generate replies, both tools target it. The right choice depends on your budget, team size, and the specific capabilities you need most.
Understanding the Core Difference
MailRush.io is Cold email software that automates outreach and multi-step follow-ups from your own SMTP/IMAP mailboxes or MailRush-provided sending accounts. Email warmup and email validation are included in every plan.
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
Starter
Lite
MailRush.io Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Starter | $19/mo | Up to 1,000 contacts | Up to 5,000 emails per month; up to 1,000 emails per day |
| Pro | $39/mo | Up to 30,000 contacts | Up to 10,000 emails per month; up to 1,500 emails per day |
| Scale | $99/mo | Up to 50,000 contacts | Up to 25,000 emails per month; up to 3,000 emails per day |
Source: MailRush.io 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
MailRush.io is more affordable at the entry level ($19/mo vs $49/mo). For teams with tight budgets or those just getting started with cold email outreach, this price difference matters.
Success.ai offers 4 pricing tiers compared to MailRush.io's 3, giving you more granularity as you scale.
Features Breakdown
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- and 5 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
MailRush.io Key Features
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- Email follow-ups
- Suppression list
- Email copy spam assessment
- Email personalization
- Unsubscription automation
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 MailRush.io
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- Email follow-ups
- Suppression list
- Email copy spam assessment
- Email personalization
- Unsubscription automation
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
MailRush.io Integrations
MailRush.io connects with: SMTP, IMAP, Zapier, Webhooks.
Success.ai Integrations
Success.ai connects with: Zapier, HubSpot, Salesforce, Pipedrive, Slack.
Shared Integrations
Both tools integrate with: Zapier.
Integrations listed only by MailRush.io: SMTP, IMAP, Webhooks.
Integrations listed only by Success.ai: HubSpot, Salesforce, Pipedrive, Slack.
Use Case Recommendations
Best Fit for MailRush.io
- Budget-conscious teams looking for an affordable cold email platform
- Teams that need a wide feature set (11 capabilities listed)
- Sales teams running high-volume outbound email campaigns
- Agencies managing multiple client outreach programs
Best Fit for Success.ai
- Budget-conscious teams looking for an affordable cold email platform
- Organizations with complex tech stacks needing broad integration support (5 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
Feature Comparison Summary
| Feature | MailRush.io | Success.ai |
|---|---|---|
| Starting Price | $19/mo | $49/mo |
| Top Tier Price | $99/mo | Contact Sales |
| Total Features Listed | 11 | 9 |
| Integrations | 4 | 5 |
Getting Started Checklist
- Define your cold email outreach requirements and monthly budget
- Estimate your expected 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
MailRush.io and Success.ai both serve the cold email outreach market. MailRush.io offers a more accessible entry point at $19/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 MailRush.io and Success.ai for current information.
Frequently asked questions.
Frequently asked questions- Which platform is cheaper, MailRush.io or Success.ai?
- MailRush.io is cheaper at the entry level, priced at $19 per month for its Starter plan compared to Success.ai's Lite plan at $49 per month. For teams with tight budgets or those just starting with cold email outreach, this price difference matters.
- How many pricing plans does each platform offer?
- MailRush.io offers three pricing tiers: Starter, Pro, and Scale. Success.ai offers four pricing tiers: Lite, Starter, Pro, and Enterprise, giving it more granularity for teams that want to scale up gradually.
- What integrations does MailRush.io support compared to Success.ai?
- MailRush.io connects with SMTP, IMAP, Zapier, and Webhooks. Success.ai connects with Zapier, HubSpot, Salesforce, Pipedrive, and Slack. The only integration both platforms list in common is Zapier.
- Does Success.ai include a contact database?
- Yes, Success.ai lists a 700M+ contact B2B database with unlimited look-ups as one of its key features, alongside AI sales and reply operators, a unified inbox, and built-in data enrichment and email verification.
- What features does MailRush.io include on every plan?
- MailRush.io includes email warmup and email validation on every plan, along with unlimited senders and unlimited email warming. It also lists API access and webhooks, Zapier integrations, spintax support, email follow-ups, and unsubscription automation among its features.
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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