Customer.io vs PostHog
Side-by-side plans, pricing, and feature gates for Customer.io and PostHog, verified . Customer.io is primarily marketing automation; PostHog is primarily analytics.
Plans side by side
Every published plan from each vendor, with the headline monthly anchor price. Some prices scale with subscriber count or seats; full detail lives on each tool's page.
Customer.io
- Essentials
Entry tier with the visual workflow builder
$100/mo - Premium
Custom volume, HIPAA available, daily routines
$1,000/mo - Enterprise
Best volume pricing with dedicated infrastructure
Custom
PostHog
- Free + Pay-as-you-go
Generous free tier across every product
Free - Boost
Add-on: Boost
$250/mo - Scale
Add-on: Scale
$750/mo - Enterprise
Add-on: Enterprise
Custom
Limits at the entry paid tier
Compares Essentials (Customer.io) against Boost (PostHog). Both are the lowest-priced non-free, non-custom plan on each side.
| Limit | Customer.io | PostHog |
|---|---|---|
| Contacts | 5,000 profiles (people plus objects) | · |
| Emails / month | 1,000,000 | · |
| Team seats | 1 | · |
When Customer.io wins
- B2C and B2B teams with custom objects in their data model (accounts, subscriptions, devices) who need messaging tied to those entities
- Product-led businesses sending behavior-triggered lifecycle messaging across email, SMS, and push
- Teams needing HIPAA compliance for healthcare or digital-health workflows
Where Customer.io is the wrong fit
- Solo creators and newsletter operators (Kit or beehiiv are the right shape)
- Small businesses that need a $0/month or $20/month entry point (MailerLite or Mailchimp Free fit better)
- Teams that want a one-click WYSIWYG email tool with no data modeling required
When PostHog wins
- Technical product teams that want one tool covering analytics, experiments, replay, and surveys
- Startups under 1M events per month, where the free tier covers the entire stack
- Companies committed to open-source infrastructure who want the option to self-host
Where PostHog is the wrong fit
- Marketing-only teams who need attribution and campaign analytics (Mixpanel or GA4 fit better)
- Enterprises with strict procurement that requires a SaaS-only vendor with no self-hosted option in scope
- Non-technical users who cannot navigate event-based analytics UIs and SQL-style insights
Common questions
- Is Customer.io cheaper than PostHog?
- At the entry tier, PostHog starts at Free versus Customer.io at $100/mo. PostHog is cheaper at the entry. Pricing scales differently above that, so check the full plan grid.
- Does Customer.io or PostHog have a free plan?
- Only PostHog has a permanent free plan. Customer.io only offers a free trial.
- Are Customer.io and PostHog in the same category?
- No. Customer.io is primarily a marketing automation tool; PostHog is primarily a analytics tool. They overlap on use case but sit in different primary categories, so the comparison is between adjacent tools rather than direct competitors.
- Which has more plans, Customer.io or PostHog?
- PostHog ships 4 plans; Customer.io ships 3. PostHog's longer ladder gives more granular upgrade steps, which can mean smoother price escalation as your team scales.
- Where can I see alternatives to Customer.io or PostHog?
- Each tool has a dedicated alternatives page on TierGauge with ranked options and verified pricing: /alternatives/customer-io for Customer.io and /alternatives/posthog for PostHog. Alternatives are derived from each tool's editor-flagged competitors plus same-category tools we track.
Customer.io: https://customer.io/pricing/ · PostHog: https://posthog.com/pricing
Last verified . Pricing changes between refreshes; confirm at the vendor before purchasing.