Customer.io vs Keap
Customer.io is a email marketing platform while Keap is a all-in-one marketing platform. Keap has been around since 2001, giving it a 11-year head start over Customer.io (founded 2012). Customer.io is the more affordable option at $100/mo — that's $199 less than Keap's $299/mo entry point. Keap has the edge with landing pages, ecommerce integrations.
Quick Verdict
Customer.io wins on price, deliverability, rating.
Keap wins on integrations.
Best for most users: Customer.io (product led saas companies with event driven messaging needs).
Customer.io
Behavioral messaging platform for product-led SaaS and tech companies
Customer.io is a behavioral messaging platform built for product-led SaaS companies that need to trigger automated emails, SMS, push notifications, and in-app messages based on real-time user events. Its visual workflow builder and Liquid templating provide deep personalization, while the built-in Data Pipelines act as a lightweight CDP. Trusted by 8,000+ companies including Notion and Segment, it starts at $100/month for 5,000 profiles.
Keap
CRM-powered sales and marketing automation for small businesses
Keap (formerly Infusionsoft, founded 2001, acquired by Thryv in 2024) is a premium all-in-one CRM and marketing automation platform built for sales-driven small businesses that need contact management, email sequences, SMS marketing, invoicing, and appointment scheduling in a single tool. Its strength lies in powerful automation workflows and a dedicated Customer Success Manager, but the $299/month starting price for just 1,500 contacts makes it one of the most expensive options in its category.
Feature Comparison
| Feature | Customer.io | Keap |
|---|---|---|
| Rating | 4.4/5 | 4.2/5 |
| Starting Price | $100/mo | $299/mo |
| Free Plan | No free plan | No free plan |
| Founded | 2012 | 2001 |
| Email Templates | 30 | 70 |
| Integrations | 150 | 5,000 |
| Deliverability Rate | 96% | 93% |
| Marketing Automation | ✓ | ✓ |
| A/B Testing | ✓ | ✓ |
| Landing Pages | ✕ | ✓ |
| Segmentation | ✓ | ✓ |
| Drag & Drop Editor | ✓ | ✓ |
| SMS Marketing | ✓ | ✓ |
| Ecommerce Features | ✕ | ✓ |
| API Access | ✓ | ✓ |
| Multi-Language | ✓ | ✕ |
| Web Push Notifications | ✓ | ✕ |
| Live Chat | ✕ | ✓ |
| Advanced Analytics | ✓ | ✓ |
Customer.io: Pros & Cons
Pros
- +Powerful visual workflow builder with real-time event-based triggers for behavioral automation
- +Omnichannel messaging across email, SMS, push notifications, in-app, and webhooks in one platform
- +Built-in Data Pipelines that serve as a lightweight CDP, unifying web, mobile, and backend data
- +Segment builder is intuitive enough for marketers without requiring dedicated engineering support
- +Startup Program offers up to 12 months free for qualifying early-stage companies
Cons
- −Essentials plan starts at $100/month for only 5,000 profiles — expensive for small teams
- −Steep learning curve for non-technical users, especially with Liquid templating syntax
- −Pricing scales aggressively past 10K profiles with significant jumps between plan tiers
- −Template editor feels restrictive for highly custom-coded email layouts
- −Searching for past messages and editing templates can be unintuitive and slow
Keap: Pros & Cons
Pros
- +Powerful drag-and-drop automation builder that handles complex multi-step sales workflows with conditional triggers
- +True all-in-one platform combining CRM, email, SMS, invoicing, payments, and appointment scheduling
- +Dedicated Customer Success Manager included with every plan for hands-on onboarding and support
- +Deep contact management with tagging, segmentation, and centralized views that reduce manual data entry
- +Built-in text marketing with tiered messaging plans and voice minutes integrated directly into automations
Cons
- −Extremely expensive at $299/month for only 1,500 contacts, with costs escalating quickly for additional contacts and users
- −Steep learning curve with complex campaign builder layouts and no undo button, causing frustration during setup
- −Email marketing capabilities feel half-baked compared to dedicated email platforms despite the premium pricing
- −Invoicing feature is rigid and does not support hourly billing or flexible customization
- −Dated mobile experience and slow feature development compared to more agile competitors like GoHighLevel
The Verdict
Customer.io edges ahead with a 4.4/5 rating compared to Keap's 4.2/5. The gap comes mainly from deliverability (4.4 vs 3.9) and value for money (4 vs 3.7). On deliverability, Customer.io reports 96% compared to 93% for Keap — a meaningful difference if inbox placement is critical for your campaigns.
| Criterion | Weight | Customer.io | Keap |
|---|---|---|---|
| Starting Price | 30% | $100/mo | $299/mo |
| Deliverability | 25% | 96% | 93% |
| Rating | 25% | 4.4/5 | 4.2/5 |
| Integrations | 10% | 150 | 5000 |
| Free Tier | 10% | No | No |
Weights determine how much each criterion counts toward the final score. See full methodology
Choose Customer.io if…
- + You want lower starting costs ($100/mo)
- + You're a product led saas companies with event driven messaging needs
- + You're a technical marketing teams that want advanced automation with liquid logic
Choose Keap if…
- + You need ecommerce integrations
- + You need built-in landing pages
- + You're a sales driven small businesses
- + You're a service based businesses