FullStory vs PostHog

Side-by-side comparison of features, pricing, and ratings

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At a glance

Dimension	FullStory	PostHog
Best for	Enterprises needing pixel-perfect session replay with privacy controls (SOC 2, HIPAA, EU residency) and autocaptured analytics.	Startups and teams consolidating product analytics, replay, feature flags, and experiments in one open-source platform with self-hosting.
Pricing	Freemium: free 30K sessions/mo. Paid plans start ~$10K/yr (Business) and scale to $200K+/yr (Enterprise). Annual contracts, custom pricing.	Freemium: free 1M events/mo + 5K recordings/mo. Cloud usage-based beyond free. Teams $450/mo + usage. Self-hosted free (open source).
Setup complexity	Low – Fullcapture auto-instrumentation via JavaScript snippet or SDK; minimal manual tagging. Mobile SDKs also autonomous capture.	Low to moderate – Autocapture snippet or SDK. Self-hosting adds infra complexity. Cloud is quick; self-host requires ClickHouse ops.
Strongest differentiator	Enterprise-grade session replay fidelity (DOM capture) with AI search (StoryAI) and compliance (HIPAA, EU residency).	Open-source product suite combining analytics, replay, feature flags, experiments, and LLM observability in a single self-hostable codebase.

FullStory vs PostHog: For enterprise teams that need pixel-perfect session replay with strict privacy and compliance (SOC 2, HIPAA, EU residency), FullStory is the winner because of its high-fidelity DOM-based capture, AI-powered search via StoryAI, and mature governance features. PostHog wins for startups and mid-market teams that want to consolidate analytics, replay, feature flags, experiments, and LLM observability into one open-source platform with self-hosting flexibility. The deciding factor is your budget and compliance requirements: FullStory excels in regulated environments, while PostHog offers better value and breadth for product teams that want control over their data.

FullStory

Enterprise digital-experience analytics: session replay, autocaptured product analytics, AI insights.

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PostHog

Open-source product analytics, session replay, feature flags, experiments, and LLM observability in one platform.

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Pricing

Freemium

Plans

Custom (~$10k–$25k/yr)

Custom (~$30k–$70k/yr)

Custom (~$80k–$200k+/yr)

Custom

From $0 + usage

$450/mo + usage

Free (open source)

Rating

—

Popularity

0 views

Skill Level

Intermediate

API Available

Platforms

WebMobileAPI

WebAPIDesktop

Feature-by-feature

Session Replay: FullStory vs PostHog

FullStory's session replay is pixel-perfect because it captures every DOM mutation server-side rather than relying on JS-side instrumentation. This means that even dynamic content and CSS animations are replayed exactly as the user saw them. FullStory also offers mobile SDKs for iOS, Android, and React Native with native replay and redaction controls. PostHog's replay includes console logs and network logs, and it ties replay to feature flags and experiments for correlation, but the fidelity is not as high as FullStory's – PostHog relies on standard canvas capture. FullStory wins for enterprises needing forensic-quality replay (e.g., diagnosing checkout drops triggered by third-party services). PostHog wins for teams that need replay integrated with A/B test results without additional cost.

AI and Analytics: FullStory vs PostHog

FullStory's StoryAI allows natural-language session search – e.g., 'show me sessions where users hit a 500 error then immediately churned' – and auto-classifies frustration signals (rage clicks, dead clicks, error clicks) with confidence scores. PostHog offers AI via LLM observability (prompt traces, costs, evals) and autocapture events, but its native AI search for session replay is less mature. PostHog's strength is the full analytics suite: funnels, retention, paths, lifecycle, and data warehouse. FullStory wins for AI-driven friction discovery. PostHog wins for comprehensive product analytics with experiment integration.

Integrations & Ecosystem: FullStory vs PostHog

FullStory integrates with Segment, Salesforce, HubSpot, Slack, Jira, Zendesk, Intercom, Snowflake, BigQuery, Redshift, Mixpanel, Amplitude, and GA. PostHog integrates with Slack, Segment, Stripe, Salesforce, HubSpot, Zapier, Vercel, Snowflake, BigQuery, Braze, and Customer.io. Both cover CRM, messaging, and data warehouses. FullStory's better support for product analytics tools (Mixpanel, Amplitude) and ticketing (Jira, Zendesk) makes it stronger for CX and support workflows. PostHog's CDP with realtime transformations and streaming gives it an edge for syncing product data to sales tools. FullStory wins for enterprise CX workflows. PostHog wins for consolidating a multi-tool stack into one platform.

Performance & Scale: FullStory vs PostHog

FullStory captures up to 30K sessions/mo on free tier and scales to millions with its Enterprise plan. It uses a proprietary server-side capture engine that maintains performance even at high volume. PostHog's architecture uses ClickHouse for analytics, providing fast queries on large datasets. PostHog's self-hosting option means you can scale on your own infrastructure; the cloud tier scales with usage but can become expensive at high volumes. FullStory's Enterprise SLA and custom retention make it better for large-scale regulated deployments. PostHog's self-hosting is ideal for startups that prefer predictable costs and full data control.

Developer Experience: FullStory vs PostHog

Both provide autocapture with minimal setup. FullStory's 'Fullcapture' captures all events automatically without tagging; you can later define events retroactively. PostHog also offers autocapture and supports Hog functions for custom event processing. PostHog goes further with webhooks, API, and a CDP for realtime transformations. FullStory's focus on privacy (element-level redaction, SOC 2, HIPAA) adds complexity but is necessary for compliance. PostHog's open-source code and active community make it more developer-friendly. PostHog wins for flexibility and extensibility. FullStory wins for compliance-ready deployments.

Pricing compared

FullStory Pricing (2026)

FullStory offers a freemium plan (FullstoryFree) at $0 with 30,000 sessions/month and 12 months of retention, including session replay and basic search. Paid plans are custom-quoted and typically require annual contracts:

Business: Custom (~$10k–$25k/yr) adds heatmaps, basic segmentation, and standard retention.
Advanced: Custom (~$30k–$70k/yr) includes dashboards, funnels, user trends, retention analysis, and advanced segmentation.
Enterprise: Custom (~$80k–$200k+/yr) adds Data Studio, AI-powered recommendations, advanced data management, custom retention, and premium SLA.
Add-ons: Mobile analytics, StoryAI, Multi-Org Management, Guides and Surveys, and Anywhere (warehouse export) are available at custom pricing.

Hidden costs: Overage fees for exceeding session limits; add-ons increase total cost. Pricing is opaque without a sales conversation, and the low end (~$10k/yr) may surprise teams used to free tools.

PostHog Pricing (2026)

PostHog's free cloud tier includes 1M events/month, 5K session recordings/month, and 1M feature flag requests/month, with community support. Beyond the free tier, pay-as-you-go usage pricing applies. The Teams plan costs $450/month plus usage and adds SSO/SAML, role-based access, audit logs, and priority support. Self-hosting is completely free (open source); you pay only for your own infrastructure (e.g., cloud servers).

PostHog's pricing is transparent for cloud (usage-based) and zero for self-host. However, at high event volumes, cloud costs can escalate unpredictably. Self-hosting requires infrastructure expertise and ClickHouse operations.

Value-per-Dollar: FullStory vs PostHog

For early-stage startups on a tight budget, PostHog wins easily – its free cloud tier is generous, and self-hosting costs nothing beyond infrastructure. PostHog also offers a broader feature set (analytics + replay + feature flags + experiments + LLM) at a lower entry price. FullStory's free tier is competitive but paid plans start at ~$10k/yr, making it expensive for small teams.

For mid-market product teams that need high-fidelity replay with compliance (SOC 2, HIPAA), FullStory provides better value per dollar because of its enterprise governance and AI-driven insights. PostHog, while configurable, lacks the same out-of-the-box compliance certifications.

For large enterprises, FullStory's Enterprise plan with custom retention, premium SLA, and AI recommendations justifies its price. PostHog's self-hosting can be cheaper, but the operational overhead of managing ClickHouse may offset savings.

Overall, PostHog wins for cost-conscious teams that want consolidation without vendor lock-in. FullStory wins for regulated enterprises that cannot compromise on replay quality or compliance.

Who should pick which

Enterprise e-commerce team diagnosing checkout drops
Pick: FullStory
FullStory's pixel-perfect replay and StoryAI natural-language search enable precise diagnosis of checkout abandonment; SOC 2 and HIPAA compliance are required for regulated retailers.
Startup consolidating analytics, replay, and feature flags
Pick: PostHog
PostHog replaces multiple tools (Mixpanel, Hotjar, LaunchDarkly) with one platform; free cloud tier and open-source self-hosting keep costs low.
Mid-market SaaS product team running A/B tests
Pick: PostHog
PostHog's integrated feature flags and experiments eliminate the need for a separate LaunchDarkly subscription; replay correlates test behavior with conversion.
AI product team needing LLM observability
Pick: PostHog
PostHog's LLM observability (prompt traces, costs, evals) is built in, allowing teams to correlate model behavior with product events.
Healthtech startup needing HIPAA-compliant session replay
Pick: FullStory
FullStory's HIPAA-ready deployment with element-level redaction and EU data residency meets regulatory requirements out of the box.

Frequently Asked Questions

What is the main difference between FullStory and PostHog?

FullStory focuses on enterprise-grade session replay with AI insights and compliance (SOC 2, HIPAA). PostHog is an open-source platform that combines analytics, replay, feature flags, experiments, and LLM observability, with self-hosting flexibility.

Which is cheaper: FullStory or PostHog?

PostHog is cheaper, especially for startups: its free cloud tier is generous, and self-hosting costs zero infrastructure. FullStory's paid plans start at ~$10k/yr, making it expensive for small teams.

Can I self-host PostHog?

Yes, PostHog is open-source and fully self-hostable. You run it on your own infrastructure with complete data control, and there is no per-user or per-seat license fee.

Does FullStory offer a free tier?

Yes, FullStory offers a free plan (FullstoryFree) with 30,000 sessions per month and 12 months retention, including basic session replay and search.

Which tool is better for compliance (HIPAA, SOC 2)?

FullStory is better for compliance: it offers SOC 2 certification, HIPAA readiness, EU data residency, and element-level redaction. PostHog self-hosted can achieve compliance but requires custom configuration.

Can I migrate from FullStory to PostHog?

Yes, but migration requires exporting session data (if needed) and re-instrumenting with PostHog's autocapture snippet. Both tools have APIs for event export, but session replay data format may differ.

Which tool is easier to set up?

Both are easy for basic setup: install a JavaScript snippet or SDK. FullStory's autocapture is automatic; PostHog's autocapture works similarly. Self-hosting PostHog adds setup complexity.

Does PostHog have session replay?

Yes, PostHog includes session replay with console logs and network logs. It ties replay to feature flags and experiments for correlation.

Does FullStory integrate with Salesforce?

Yes, FullStory integrates with Salesforce, HubSpot, and other CRM tools, allowing support teams to jump from a ticket to a user's session.

Which tool is better for mobile app analytics?

FullStory offers dedicated mobile SDKs for iOS, Android, and React Native with native session replay and redaction. PostHog also has mobile SDKs but its replay is less mature. FullStory wins for mobile replay.

Last reviewed: May 12, 2026