Data as of Oct 16, 2026A topic in Product Analytics and Session Replay.
Reviewed by Dimitry Apollonsky
Amplitude and Mixpanel are nearly even for product analytics software with a free plan. For a new product where insight per dollar matters, PostHog is recommended.
Intuitive event-based behavior tracking and fast funnel analysis.
An all-in-one suite for product engineers seeking insight per dollar.
Mentioned in · Jul 5 – Oct 16, 2026
ChatGPT SearchOct 7, 2026
If your goal is specifically tracking behavior inside your product—feature usage, funnels, retention, user paths, cohorts, etc.—my top pick right now is PostHog.
| Tool | Free tier | Best for | My take |
|---|---|---|---|
| PostHog | 1M events/mo + 5K replays | Startups / engineering-led teams | 🥇 |
| Amplitude | 2M events/mo | Deep product analytics | 🥈 Best analytics depth |
| Mixpanel | 1M events/mo | Simple funnels & retention | 🥉 Easiest pure analytics option |
| Heap | ~10K sessions/mo | Automatic capture | Best if you don't want to instrument everything |
PostHog's current free plan gives you 1M analytics events, 5,000 session recordings, 1M feature-flag requests, 100K error exceptions, and 1,500 survey responses every month, indefinitely. It also doesn't charge per seat.
That's unusually compelling because you get analytics + session replay + feature flags + experiments in the same product rather than having to stitch several tools together.
Choose Amplitude if your primary concern is sophisticated product analysis. Its current free tier is 2M events/month and includes analytics, experimentation, session replay, and AI features.
Choose Mixpanel if you want a very polished, focused analytics experience—especially funnels, retention, cohorts, and dashboards—without all the extra product-development tooling. Its free plan is also 1M events/month.
Choose Heap if your biggest concern is instrumentation. Its autocapture approach can record user interactions without requiring you to explicitly define every event ahead of time. The tradeoff is a smaller free allowance measured in sessions.
For a startup or growing SaaS/app, I'd start with PostHog.
The particularly nice part is that you can start with:
Events → funnels → retention → session recordings → feature flags
without paying anything, and the free allowance resets monthly. PostHog also lets you set billing limits, so you can prevent accidental overages when you eventually enable paid usage.
If you tell me (1) web, mobile, or both, (2) approximate monthly active users, and (3) whether you're B2B SaaS or B2C, I can tell you whether I'd pick PostHog, Amplitude, or Mixpanel for your particular product.
When tracking user behavior inside a software product, three heavy hitters dominate the product analytics space, and all of them offer genuinely generous free tiers. However, "best" depends entirely on your data volume model (events vs. users) and whether you just need raw data or extra goodies like session replays.
The three best options with robust free plans compare as follows:
To help narrow down which of these fits your setup best, could you tell me:
If you're looking for a user behavior analytics tool for your software, I'd focus on platforms that offer product analytics, event tracking, user journeys, funnels, and session replays without forcing you to upgrade as your user base grows.
The most generous free plans tend to come from product analytics tools rather than traditional web analytics platforms. The biggest differences are whether they cap monthly events, tracked users, session recordings, or data retention.
(Best free event allowance)
Offers product analytics, funnels, retention analysis, session replay, and unlimited team seats. Its free plan requires no credit card.
Best for: SaaS products that need to understand feature adoption and user retention.
Pricing:
(Best all-in-one toolkit)
The free tier also includes feature flags, error tracking, surveys, and other developer tools. It has no time limit, and the free plan doesn't require a credit card.
Best for: Developers building web apps, mobile apps, or SaaS products who want analytics alongside debugging tools.
Pricing:
Includes funnels, retention reports, user flows, and unlimited seats. The free plan limits saved reports to five per seat, so it may be restrictive for teams building lots of dashboards.
Best for: Product managers who want straightforward event analytics and conversion reporting.
Pricing:
(Best for unlimited traffic)
Provides session recordings, click and scroll heatmaps, frustration signals, and AI-generated insights. It's particularly useful for seeing what people actually do on your website.
Best for: Website UX, landing pages, and checkout-flow optimization. It is less of a full-fledged product analytics warehouse than Amplitude or PostHog.
Pricing:
Captures user interactions automatically, reducing the need to manually define every event. The free plan includes core analytics and six months of data history, but session replay is not included in the listed free-plan features.
Best for: Teams that want to explore user behavior without extensive upfront instrumentation.
Pricing:
| Tool | Main free allowance | Biggest advantage |
|---|---|---|
| Amplitude | 2M events/month | Deep product analytics |
| PostHog | 1M events + 5K replays/month | Broad developer toolkit |
| Mixpanel | 1M events + 10K replays/month | Funnels and retention |
These allowances are based on the vendors' published plans; event and session limits measure different things, so they aren't directly interchangeable.
One practical tip: if you have a web application, combining PostHog or Amplitude with Microsoft Clarity can give you both quantitative analytics (what users do and where they drop off) and visual evidence (how they interact with the interface).
What kind of software are you tracking?
1. What are you building?
Web application / SaaS
Mobile app
Marketing website / ecommerce
Desktop application
2. What behavior do you most want to track?
Events, funnels, and retention
Session recordings and heatmaps
Individual user journeys and profiles
All of the above
3. Approximate monthly active users
Under 100,000
100,000–1 million
Over 1 million
Not sure yet
[Find my best fit]
Google AI ModeOct 16, 2026
When tracking user behavior in software, choosing a platform with a strong free tier lets you test product-market fit or early user adoption without committing to a hefty monthly subscription.
The top user behavior and product analytics tools with the most generous free plans are ranked below by volume and feature accessibility:
The "best" product analytics tool depends heavily on your product type (B2B vs. B2C), your team’s technical setup, and whether you need qualitative tools (like session replays) alongside quantitative numbers.[](https://www.growthbook.io/insights/free-product-analytics-tools)
The top options with exceptionally generous free plans are broken down below by their strengths:
To help narrow down the ideal choice, tell me:
ChatGPT SearchSep 25, 2026
For most teams trying to understand user behavior inside a product (activation, funnels, retention, feature adoption), I’d start with one of these three:
| Tool | Best fit | Free plan highlights | Tradeoffs |
|---|---|---|---|
| posthog.com | Startups, engineering-led teams, teams wanting an all-in-one tool | Product analytics + session replay + feature flags; also has a self-hosted option | More knobs and configuration; can feel less polished than dedicated analytics tools |
| Microsoft Clarity |
| No traffic limit |
| Free heatmaps and recordings |
| Heap | 10K sessions/month | Automatic event capture |
If you can share your estimated monthly active users (MAUs) or expected event volume , I can help calculate which of these free tiers you will fit into best or see if you qualify for startup discount programs.
| Product teams focused on funnels, cohorts, retention |
| Strong event analytics with a free tier |
| Less focused on being an all-in-one product stack |
| amplitude.com | Larger product organizations and teams needing deeper behavioral analysis | Free tier with core analytics capabilities | Can become expensive as usage and advanced needs grow |
Early-stage SaaS / startup: Start with PostHog if you want analytics plus session replay, feature flags, and experimentation in one place.
Product manager + growth team: Start with Mixpanel if your main questions are:
“Where do users drop off in onboarding?”
“Which features correlate with retention?”
“What do power users do differently?”
Larger company or analytics-heavy team: Evaluate Amplitude for more sophisticated behavioral analysis and cross-functional reporting.
Don’t start by tracking everything. Track the events that answer product questions:
Activation
account_created
onboarding_completed
first_key_action_completed
Engagement
feature_used
project_created
content_shared
Retention
weekly/monthly active usage
repeat completion of the core action
Conversion
trial started
upgrade started
subscription purchased
For a small product:
For a consumer app with lots of experimentation:
The “best” free plan depends mostly on your product stage and what you mean by user behavior: funnels/retention, session recordings, UX issues, or feature experiments. If you tell me your product type (SaaS, mobile app, marketplace, etc.) and approximate users/month, I can narrow it down.
