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TL;DR: Rehearsals creates AI digital twins of your customers to optimize pricing, product features, and advertising copy based on watching your customers use your product. PostHog is a DIY analytics toolkit that requires manual instrumentation and analysis.

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The only AI research team that watches every session for you

Rehearsals is an AI research and data science platform that does the work of an entire user research team. After adding a one-line script on your website, Rehearsals watches every session replay, understands why users pay and why they churn, and tells you exactly what you need to do next. This behavioral context powers AI digital twins, scientifically built replicas of your customers based on behavioral and preference data, that predict how pricing changes, design iterations, and messaging will perform before you ship. PostHog, by contrast, is a modular product analytics data warehouse. You get session replays, funnels, heatmaps and feature flags, but you still need to hire a team of analysts to instrument events, build dashboards, and interpret what the data means. Its AI assistant simply runs SQL on data you’ve already captured. It doesn’t watch replays or learn from your customers.

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Key Differentiators

Unlimited Session Replays

Rehearsals: Every visit recorded automatically with no capsPostHog: 5k recordings/month on free tier, then $0.005 per recording

AI Digital Twins

Rehearsals: Test pricing, copy, and features before shipping, powered by scientifically built digital twins of your customersPostHog: No equivalent to AI digital twins

Retroactive Event Tracking

Rehearsals: Define any event in plain English and instantly get weeks of historical data from past session replaysPostHog: Write custom code, deploy to production, then wait 2+ weeks to collect enough data

Revenue Opportunities, Delivered Daily

Rehearsals: AI surfaces pricing optimizations, copy improvements, and funnel fixes automaticallyPostHog: You build dashboards and do the analysis yourself

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What Makes Rehearsals Different Than PostHog?

Unlimited Session Replays

Rehearsals automatically records every visit with no caps, so you always have a complete picture.PostHog’s free tier caps recordings at 5,000 per month and charges $0.005 per recording once you exceed that limit. For high-traffic sites, replay costs can add up quickly, and you’ll never have complete coverage of your users’ journeys.
Our digital twins are scientifically built replicas of your customers based on behavioral and preference data collected from every session. They recreate each user’s decision process to test new features, copy, or pricing without waiting for live data.These digital twins simulate how real users would respond to changes, letting you validate ideas before shipping. PostHog has no equivalent capability. You’re left guessing until you ship to production.
Need to track something new? Describe it as if you were talking to a coworker and Rehearsals will instantly extract that data from weeks of historical session replays. No code changes required.
Example: "Extract the total cart value when users click checkout"
With PostHog, you need to write custom code with posthog.capture for every new behavior, deploy it to production, then wait 2+ weeks to accumulate enough data to make decisions. With Rehearsals, you describe what you want and get historical data instantly.
Ask your hardest strategic questions and Rehearsals will watch hundreds of sessions, synthesize behavioral data and user preferences, and deliver fully cited research briefs and slide decks. We focus on the three critical business outcomes: optimizing pricing strategy, improving advertising and messaging copy, and identifying product feature and conversion funnel improvements.
Example question: “Why are users abandoning checkout, and what should we test next?”
Rehearsals provides comprehensive answers backed by session evidence, complete with presentation-ready slides. PostHog shows you the data but doesn’t interpret it. You’ll need to hire analysts or consultants to do this work.
Our Radar continuously scans user behavior to surface high-impact revenue opportunities your team might miss. Every day you get a feed of snackable, actionable insights discovered by AI, things you wouldn’t have known to look for.PostHog requires you to manually set up alerts and build dashboards for every metric you can think of. There’s no proactive scanning, so you only find what you already knew to look for.
Upload strategy decks, business goals, or target personas and Rehearsals’ AI will keep them in mind when analyzing sessions and answering questions, ensuring every recommendation aligns with your priorities.This contextual awareness means every insight is tailored to your specific business objectives. PostHog has no concept of your business context. It’s a generic analytics tool that treats every user the same way.

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Where PostHog Falls Short

While PostHog is a solid analytics toolkit, it lacks the AI-powered intelligence and automation that makes Rehearsals transformative.

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Limited Free Data

PostHog’s generous free tier includes 1M events and 5k session recordings per month, but every extra replay costs money. Surveys, feature flags and error tracking also have their own quotas that can add up quickly for growing teams.

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Manual Instrumentation Required

Auto-capture collects every click and rage-click, often creating noise; many experts recommend turning it off. To track meaningful actions you must write and deploy custom code with posthog.capture for each event. 
// PostHog requires manual instrumentation
posthog.capture('checkout_completed', {
  cart_value: 99.99,
  items_count: 3
})

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Charts Over Actions

PostHog visualizes data with funnels, heatmaps, and cohorts (which looks great in a meeting) but it doesn’t tell you what to do about it. You still need to hire data analysts, user researchers, and consultants to interpret the data, run user interviews, and develop recommendations. Rehearsals, on the other hand, surfaces actionable next steps automatically: specific pricing adjustments to test, messaging copy that will resonate, and product features that will move conversion. It’s the difference between seeing a chart and getting a roadmap.

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No Proactive Intelligence

You’re responsible for setting up dashboards, defining metrics, and monitoring alerts. There’s no AI scanning user journeys for patterns or missed opportunities you didn’t think to look for. If you don’t know to ask the question, PostHog won’t surface the answer.

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Setup Comparison

<!-- Drop this in your <head> tag and you're done -->
<script src="https://app.runrehearsals.com/recorder.js" async></script>
Rehearsals: Sessions start recording immediately; revisit any moment and ask new questions without changing code.

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Side-by-Side Feature Comparison

FeatureRehearsalsPostHog
Session Replay✅ Unlimited, automatic⚠️ Limited (5k/mo free)
AI Analysis✅ Watches & learns from every session❌ SQL queries on captured data only
Event Tracking✅ Zero-code, describe in plain English❌ Manual instrumentation required
Digital Twins✅ Test pricing, copy & features before shipping❌ Not available
Actionable Recommendations✅ Daily AI-discovered revenue opportunities❌ Manual dashboard setup & analysis
Strategic Research & Slides✅ AI-generated briefs with presentation decks❌ Self-service analysis only
Business Context Awareness✅ Learns your goals & strategy❌ Generic analytics
Setup Complexity✅ One-line script⚠️ Script + event instrumentation
Cost ModelFixed pricing, unlimited usagePay per event/recording

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Choose the AI-Powered Future

For Teams Who Want Intelligence

Choose Rehearsals if you want to free your team from endless tagging and dashboard building. Get unlimited session coverage, AI-powered recommendations on pricing strategy, advertising copy optimization, and product funnel improvements, all without extra engineering work or hiring consultants.

For DIY Analytics

Choose PostHog if you prefer full control and have engineering resources to instrument events, build dashboards, and manually analyze data. Good for teams with dedicated data analysts who want feature flags and experiments.
Ready to see the difference? Try Rehearsals and turn every session into actionable intelligence. No instrumentation required.