PostHog and FullStory are both popular tools for understanding user behavior, but how are they different? Here's the short answer.
PostHog is an all-in-one [developer platform] (/products) built to help engineers build successful products. It offers a wide range of features to help teams build better products, including analytics, session replay, feature flags, error tracking, experiments, and more.
FullStory is a behavioral data and analytics platform focused on session replay, product analytics, and frustration signal detection. It has expanded in recent years with StoryAI (AI-powered insights), Guides and Surveys, and Anywhere (data warehouse sync and real-time activation).
In this comparison, we'll explore, compare and contrast PostHog and FullStory in detail, so you can decide which tool is right for you. We'll look at areas such as...
FullStory has expanded beyond session replay into analytics, AI insights, and in-app messaging, but it still doesn't include feature flags, A/B testing, or error tracking.
In contrast, PostHog is a comprehensive, all-in-one platform that has robust analytics, feature flagging, A/B testing, session recording, error tracking, workflows and more.
It easily replaces an entire stack of traditional tools, such as LaunchDarkly, Amplitude, and FullStory.
PostHog is designed from the ground up to meet the needs of developers, and product-focused engineers. Session replay includes advanced tools for debugging errors and performance issues, while feature flags make it easy to test, and roll out, new features at scale. You get SQL access, a fully documented API, and SDKs for every major platform.
Our pricing is 100% transparent. There are no hidden fees or surprise overages – what you see is exactly what you'll pay.
We also default to charging as little as possible while still making a sensible margin, and every product comes with a generous free tier. In fact, more than 90% of companies use PostHog for free!
In 2024, we cut prices for session replay and analytics events. In 2025, we've cut prices for data pipelines and surveys. If we can cut pass a saving onto our customers, we always will.
This comparison will compare all available features, regardless of pricing tier. Visit the pricing section in the FAQ for more information on pricing.
Product analytics: Both FullStory and PostHog offer product analytics, but what they offer is drastically different. We explore this comparison in greater detail below.
Data warehouse: PostHog includes a built-in data warehouse for importing and querying external data. FullStory offers Anywhere: Warehouse for exporting behavioral data to BigQuery, Snowflake, Redshift, and Databricks, and Anywhere: Activation for real-time behavioral triggers – but these are paid add-ons.
Further reading: How FullStory compares to other PostHog alternatives
FullStory is aimed at UX designers, general product managers, and customer success teams, while PostHog is suited to product engineers, front-end developers and more technical users. As a result, PostHog offers a wider range of analytics tools, including its own SQL dialect for detailed analysis.
Product analytics in PostHog is closely integrated with other tools, such as feature flags and session replays.
This means you can use a Trends insight to examine the performance of a particular metric, click on a point in the graph to see users who contributed to it, and then jump directly to their session replay to see what they did.
You can also do this in reverse by filtering for session replays where particular events occur, and creating dynamic playlists. We cover these session replay features in greater depth below.
FullStory's StoryAI (powered by Google Gemini) can summarize sessions, answer natural language questions, and proactively surface friction points – but it's a premium add-on and doesn't connect to experiments or feature flags since FullStory lacks those features.
PostHog ships weirdly fast. We never stop shipping. Visit the weekly changelog to keep up to date, or take a look at what we’re planning in our public roadmap!
FullStory is well-known for session replay, while PostHog is an all-in-one platform. The gap between them on replay has narrowed significantly, with PostHog offering developer-focused debugging tools that FullStory doesn't.
PostHog's session replay includes console logs, network request monitoring, a DOM explorer, performance metrics, and AI-powered session summaries – making it more powerful for debugging. Data retention varies depending on the plan you choose.
FullStory's strength is its frustration signal detection (rage clicks, dead clicks, error clicks) and StoryAI-powered session summaries. It offers a 30,000 sessions per month free tier with 12 month retention, but limited features.
Different types of heatmaps enable you to see where users are focusing their attention – or even precisely where they are looking on a page.
PostHog includes a built-in CDP with sources, transformations, and destinations, as well as a built-in data warehouse. FullStory offers Anywhere: Warehouse (hourly data sync to BigQuery, Snowflake, Redshift, S3, GCS, Azure Blob, and Databricks) and Anywhere: Activation (real-time behavioral triggers) – both are paid add-ons.
Below are some of the most popular integrations for FullStory and PostHog:
Both PostHog and FullStory support a broad range of tracking options, manual event instrumentation, and autocapture.
Should you autocapture events?
Autocapture is much faster to set up than manual instrumentation, but some argue that it creates too much noise to be useful. We disagree, and it's why PostHog gives you your first million events for free, every month – so you can capture events without worrying about event limits. It's something we feel strongly about.
For engineering-led product teams
For UX and customer success teams
For growth and experimentation teams
For teams building AI products
For ecommerce and retail teams
For privacy-conscious and regulated organizations
For early-stage startups
PostHog uses transparent, usage-based pricing. It's free to get started – no credit card required. Every month you get 1 million events, 5,000 web session replays, 2,500 mobile session replays, and 1 million feature flag requests for free. After that, you pay only for what you use, and pricing gets cheaper at scale. You can set billing limits per product to avoid surprises.
FullStory offers a free plan (FullstoryFree) with 30,000 sessions/month and 12-month retention, but it excludes dashboards, mobile apps, StoryAI, and configurable form privacy. Paid plans (Business, Advanced, Enterprise) require contacting sales – pricing isn't publicly available.
It doesn't cost anything to get started with PostHog, and every month you get your first million events and first 5,000 sessions for free. You can set billing limits to stay within the free allowance forever.
FullStory offers a 14-day free trial of its Business plan (limited to 5,000 sessions), after which you can convert to the free FullstoryFree plan or contact sales for a paid plan.
No. FullStory doesn't offer native feature flags, A/B testing, or experimentation. You'd need a separate tool like LaunchDarkly, Optimizely, or PostHog. PostHog includes both feature flags and A/B testing natively, tightly integrated with analytics and session replay.
No. FullStory doesn't offer error tracking or crash monitoring. PostHog includes native error tracking that connects exceptions and stack traces directly to session replays, user behavior, and feature flag changes.
Yes. FullStory launched Guides and Surveys in February 2026, adding in-app tours, smart tips, checklists, banners, and surveys targeted by user behavior. PostHog also includes surveys with NPS, CSAT, CES, and custom question types, with targeting based on person properties, URLs, feature flags, or events.
StoryAI is FullStory's suite of AI-powered features, powered by Google Gemini. It includes session summaries, natural language queries (Ask StoryAI), proactive opportunity detection, and AI-suggested elements. Session summaries are included on Advanced and Enterprise plans; Opportunities and Ask StoryAI require StoryAI Premium.
PostHog also offers AI features including session replay summaries, an MCP server for AI coding tools like Cursor and Claude Code, and PostHog AI for generating insights and querying your data in natural language.
Both PostHog and FullStory offer privacy masking to automatically remove text field input from session replays, as well as more advanced controls to further protect user privacy. PostHog also supports cookieless tracking and is open source, so you can audit exactly what data is collected.
Both are strong but serve different needs. PostHog's replay includes console logs, network monitoring, a DOM explorer, and performance metrics – ideal for debugging. FullStory's replay excels at frustration signal detection (rage clicks, dead clicks) and AI-powered session summaries via StoryAI. FullStory's free tier offers more sessions (30,000/month vs 5,000/month), but PostHog's replay is more developer-focused.
Yes – though there are some caveats. You can export historical event data from FullStory and import it into PostHog using the historical migrations guide. Session replay recordings can't be migrated since they're stored in FullStory's proprietary format. The simplest approach is to install PostHog's snippet alongside FullStory, run both in parallel, and transition fully once you're confident in the setup.
Yes. PostHog offers EU-hosted cloud with data stored exclusively in the EU. PostHog is SOC 2 certified, GDPR-ready, and HIPAA-ready.
Minutes. Use the setup wizard to connect your app – one terminal command and our AI wizard handles framework detection, SDK config, and more. Autocapture starts collecting events immediately. Enable session replays, feature flags, and other features from your project settings.
Other popular tools include Hotjar, LogRocket, Heap, Amplitude, and Mixpanel. For a full breakdown, see our guide to the best FullStory alternatives and the best session replay tools for developers.
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