In-Depth Comparison
Heap vs PostHog
In-depth comparison of Heap and PostHog for B2B SaaS companies. We analyze autocapture, feature flags, session replay, pricing, and real-world use cases.
Last updated: 2026-03-15
Heap
heap.ioDigital insights platform that automatically captures every user interaction.
Ideal for: B2B SaaS teams wanting analytics without instrumentation, with retroactive analysis and digital experience insights via Contentsquare
PostHog
posthog.comThe open-source product analytics suite.
Ideal for: Developer-led B2B SaaS teams wanting open-source analytics with feature flags, session replay, and experimentation in one platform
TL;DR: Heap vs PostHog
Heap wins for teams that want instant analytics via autocapture without writing tracking code. PostHog wins for developer-led teams that want an open-source all-in-one suite with feature flags, A/B testing, and session replay alongside analytics. Both offer session replay. Sequenzy integrates with both and adds SaaS lifecycle email automation.
Autocapture analytics for instant insights without code
Open-source all-in-one product suite for developers
SaaS lifecycle email that acts on your analytics data
Editor's Note
Both track behavior but cannot act via email. Sequenzy (sequenzy.com) adds SaaS lifecycle email automation with billing integration.
Heap vs PostHog vs Sequenzy: Quick Comparison
| Feature | Heap | PostHog | Sequenzy | Edge |
|---|---|---|---|---|
| Autocapture | Core feature, captures everything | Available but also supports explicit events | N/A | Heap |
| Feature Flags | Not available | Full feature flag system | N/A | PostHog |
| A/B Testing | Limited | Built-in with feature flag integration | Email A/B testing | PostHog |
| Session Replay | Via Contentsquare | Built-in with event timeline | N/A | Tie |
| Open Source | No | Yes (MIT) | No | PostHog |
| Self-Hosting | No | Yes | No | PostHog |
| Retroactive Analysis | Full retroactive event definition | Limited (only explicit events) | N/A | Heap |
| Billing Integration | Not native | Not native | Native Stripe, Paddle, LemonSqueezy, Chargebee | Sequenzy |
Score Breakdown
Each category scored out of 10. Totals: Heap 47/80, PostHog 59/80, Sequenzy 36/80.
Feature-by-Feature Comparison
Detailed feature analysis across every category that matters for B2B SaaS email.
📊 Data Collection
| Feature | Heap | PostHog | Sequenzy |
|---|---|---|---|
| Autocapture depth | 10/10 Captures every click, page view, form submission automatically | 7/10 Autocapture available but also emphasizes explicit events | 3/10 N/A |
| Retroactive event definition | 10/10 Define events from historical data anytime | 5/10 Autocaptured events can be filtered retroactively, less flexible | 3/10 N/A |
| Custom event tracking | 7/10 Supports custom events alongside autocapture | 9/10 Excellent custom event support with rich properties | 5/10 Billing and email events |
🛠️ Developer Tools
| Feature | Heap | PostHog | Sequenzy |
|---|---|---|---|
| Feature flags | 2/10 Not available | 9/10 Full system with targeting, rollouts, multivariate | 3/10 Not available |
| A/B testing | 5/10 Limited experimentation | 8/10 Built-in tied to feature flags | 7/10 Email A/B testing |
| Surveys | 3/10 Not a core feature | 8/10 Built-in in-app surveys with targeting | 3/10 N/A |
| Session replay | 8/10 Available via Contentsquare | 9/10 Built-in with event timeline, network, console | 2/10 N/A |
📧 SaaS Lifecycle Email
| Feature | Heap | PostHog | Sequenzy |
|---|---|---|---|
| Email automation | 2/10 Not an email platform | 2/10 Not an email platform | 10/10 Purpose-built lifecycle email |
| Billing integration | 3/10 Track as events | 3/10 Track as events | 10/10 Native billing integration |
| Dunning | 1/10 N/A | 1/10 N/A | 10/10 Automated dunning |
Heap vs PostHog vs Sequenzy: Pricing
Heap uses custom session-based pricing. PostHog uses transparent pay-as-you-go per product. Sequenzy uses email volume pricing.
Free plan: up to 10K sessions/month
Free plan: generous allocations per product
14-day free trial
| Tier | Heap | PostHog | Sequenzy | Volume |
|---|---|---|---|---|
| Free | $0/mo (10K sessions) Core autocapture analytics | $0/mo (1M events, 5K sessions, etc.) All products with free allocations | $19/mo Full lifecycle email | 10K sessions / multi-product free / 15,000 emails |
| Growth | Custom pricing Full features | Pay-as-you-go Volume discounts | $49/mo Advanced sequences | Custom / scales per product / 50,000 emails |
| Enterprise | Custom Contentsquare features | Custom SSO, support | $149/mo Priority support | Custom / custom / 200,000 emails |
Heap: Watch Out For
- !Custom pricing opaque
- !Contentsquare premium features extra
- !Sessions scale with traffic
PostHog: Watch Out For
- !Self-hosting requires infrastructure
- !Multiple products can add up
- !Enterprise features require paid plans
Sequenzy: Watch Out For
- !No hidden costs
- !All integrations included
Pricing Verdict: PostHog offers more transparent pricing and bundles more features. Heap requires a sales conversation. Sequenzy at $19/mo adds lifecycle email.
Cost Comparison Note
PostHog transparent pricing contrasts with Heap custom pricing. Neither handles lifecycle email. Sequenzy at $19/mo fills this gap.
B2B SaaS Use Cases
How each platform handles the email workflows that matter most for B2B SaaS companies.
⚡ Instant Analytics Without Engineering
Getting analytics running immediately without writing tracking code.
Heap
Add Heap snippet. Autocapture records everything. Define events visually from captured data.
PostHog
PostHog has autocapture but also emphasizes explicit tracking for richer data.
Sequenzy
Connect billing provider for lifecycle email in 1-2 days.
Verdict: Heap wins for zero-engineering analytics setup.
🚩 Feature Flag Driven Development
Rolling out features gradually with flags and measuring impact.
Heap
Heap does not provide feature flags. Requires a separate tool.
PostHog
Built-in feature flags with targeting, rollouts, and direct analytics integration.
Sequenzy
Can send feature announcement emails.
Verdict: PostHog wins decisively with built-in feature flags.
📧 Lifecycle Email Automation
Automating email from product behavior and billing events.
Heap
Not an email platform.
PostHog
Not an email platform.
Sequenzy
Purpose-built with billing integration for onboarding, dunning, retention.
Verdict: Sequenzy is the only option.
Real-World Example
Automated onboarding email tied to Stripe events.
Example subject line: Welcome to [Product]. Your setup starts here.
💳 Dunning & Revenue Recovery
Recovering failed payments automatically.
Heap
Cannot send dunning emails.
PostHog
Cannot send dunning emails.
Sequenzy
Automated dunning with native billing integration.
Verdict: Sequenzy handles the full dunning lifecycle.
The Bigger Picture
Analytics tracks what users do. Sequenzy acts on it with billing-aware lifecycle email for onboarding, dunning, and retention.
Automation Capabilities
Email automation is critical for B2B SaaS. Here is how Heap, PostHog, and Sequenzy compare.
| Capability | Heap | PostHog | Sequenzy |
|---|---|---|---|
| Autocapture | Yes Core feature, captures everything | Yes Available alongside explicit tracking | No N/A |
| Feature flags | No Not available | Yes Full system with targeting | No N/A |
| A/B testing | Yes Limited | Yes Built-in with flag integration | Yes Email A/B testing |
| Billing triggers | No Tracks only | No Tracks only | Yes Native billing triggers |
| Lifecycle email | No Not email platform | No Not email platform | Yes Pre-built SaaS sequences |
API & Developer Experience
For B2B SaaS teams, the API quality directly impacts how fast you can integrate and iterate on email.
Heap API
- SDKs: JavaScript, iOS, Android, React Native, REST API
- Docs: 8/10
- Webhooks: Segment changes
- Rate Limit: Varies
- Batch: Batch API
PostHog API
- SDKs: JavaScript, Python, Ruby, iOS, Android, React Native, Flutter, Node.js, Go, PHP, Elixir
- Docs: 9/10
- Webhooks: Action webhooks, feature flag changes
- Rate Limit: Fair use, no hard limit
- Batch: Batch API
Sequenzy API
- SDKs: Node.js (official), Python (official), REST API
- Docs: 8/10
- Webhooks: Email + billing events
- Rate Limit: 50 req/sec
- Batch: Batch sending
Heap Code Example
// Add Heap snippet - autocapture handles everything
// heap.load("YOUR_ENV_ID");
// No tracking code neededPostHog Code Example
import posthog from "posthog-js";
posthog.init("YOUR_KEY");
posthog.capture("feature_used", { feature: "reports" });
if (posthog.isFeatureEnabled("new-ui")) { showNewUI(); }Sequenzy Code Example
import { Sequenzy } from "sequenzy";
const sq = new Sequenzy("sq_your_api_key");
await sq.subscribers.add({ email: "user@co.com", stripeCustomerId: "cus_123" });
await sq.sequences.trigger({ email: "user@co.com", sequence: "onboarding" });Email Deliverability Comparison
Your emails are useless if they do not reach the inbox. Here is how all three platforms handle deliverability.
| Factor | Heap | PostHog | Sequenzy |
|---|---|---|---|
| Email Sending | Not an email platform | Not an email platform | Managed SaaS-only infrastructure |
| Inbox Placement | N/A | N/A | ~96-98% |
| Auth Protocols | N/A | N/A | SPF, DKIM, DMARC |
Neither sends email. Sequenzy handles SaaS email delivery.
Integration Ecosystem
Heap has ~40 integrations, PostHog has ~40, and Sequenzy has ~25. Here is how they compare across key B2B SaaS categories.
Data Infrastructure
| Service | Heap | PostHog | Sequenzy |
|---|---|---|---|
| Segment | Yes (Native) | Yes (Native) | Yes (Official) |
| Rudderstack | Yes (Official) | Yes (Native) | Yes (3rd Party) |
Payment & Billing
| Service | Heap | PostHog | Sequenzy |
|---|---|---|---|
| Stripe | Yes (3rd Party) | Yes (3rd Party) | Yes (Native) |
| Paddle | No (API Only) | No (API Only) | Yes (Native) |
Analytics & Reporting
What data you can track and how each platform helps you measure email performance.
| Metric | Heap | PostHog | Sequenzy |
|---|---|---|---|
| Event analytics | Autocaptured with visual definition | Custom events with HogQL | Email events |
| Session analysis | Session replay via Contentsquare | Built-in session replay | N/A |
| Revenue tracking | Event-based | Event-based | MRR per sequence |
Heap: Unique Features
- + Autocapture without code
- + Retroactive event definition
- + Contentsquare digital experience
PostHog: Unique Features
- + Built-in feature flags
- + In-app surveys
- + Open source
- + Self-hosting
- + HogQL
Sequenzy: Unique Features
- + MRR impact per sequence
- + Dunning recovery
- + Trial conversion
- + Churn metrics
Pros & Cons
Heap
Pros
- + Best autocapture without code
- + Full retroactive analysis
- + Session replay via Contentsquare
- + Fast setup
- + Visual event builder
- + No engineering required
Cons
- - No feature flags
- - No A/B testing platform
- - Not open source
- - Custom pricing opaque
- - Contentsquare acquisition uncertainty
- - Not email platform
PostHog
Pros
- + All-in-one open-source suite
- + Built-in feature flags
- + Built-in A/B testing
- + Self-hosting option
- + Transparent pricing
- + Developer-friendly HogQL
Cons
- - Autocapture less comprehensive than Heap
- - No retroactive event definition as strong as Heap
- - Younger platform
- - Smaller company
- - Not email platform
Who Should Use What?
Specific recommendations based on your company type and needs.
Non-technical analytics team
Want analytics without any code.
Heap autocapture and visual event builder require zero engineering.
Developer-led product team
Want analytics, flags, and testing in one tool.
PostHog bundles everything developers need, open source.
Lifecycle email
Need automated SaaS lifecycle email.
Neither sends email. Sequenzy adds billing-aware lifecycle email.
Data sovereignty
Must self-host analytics.
Only PostHog offers self-hosting.
Migration Guide
Migrating from Heap to PostHog
Steps
- 1. Add PostHog SDK
- 2. Map autocaptured events to PostHog events
- 3. Set up feature flags
- 4. Configure session replay
- 5. Recreate dashboards
- 6. Validate data
Watch Out For
- ! Lose retroactive analysis depth
- ! Need explicit instrumentation for some events
- ! PostHog autocapture works differently
Migrating from PostHog to Heap
Steps
- 1. Add Heap snippet
- 2. Autocapture starts
- 3. Map PostHog events to Heap virtual events
- 4. Find feature flag replacement
- 5. Recreate dashboards
- 6. Validate
Watch Out For
- ! Lose feature flags and A/B testing
- ! Need separate tool for flags
- ! Lose in-app surveys
- ! PostHog explicit events need Heap custom events
The Bottom Line
Choose Heap if...
- ✓ Zero-code analytics is a priority
- ✓ Retroactive event definition is valuable
- ✓ Your team is non-technical
- ✓ Fast setup without engineering matters
- ✓ Digital experience analytics (Contentsquare) interest you
Choose PostHog if...
- ✓ You want analytics + flags + testing in one platform
- ✓ Open source and self-hosting matter
- ✓ You are a developer-led team
- ✓ Feature flags are essential
- ✓ Transparent pricing is preferred
Frequently Asked Questions
Both have session replay. Which is better?
PostHog session replay is built natively with event timeline, network tab, and console logging. Heap session replay comes via Contentsquare integration with digital experience analytics. Both are capable; PostHog is more developer-oriented while Heap/Contentsquare is more UX-oriented.
Can either handle lifecycle email?
No. Use Sequenzy for SaaS lifecycle email with billing integration.