TL;DR Verdict
Amplitude is the stronger pick for product and growth teams that need deep behavioral analytics, funnel analysis, and retention reporting. Fullstory wins when you need to understand why users drop off, not just where, because session replay and heatmaps are its core strengths. For small product teams and early-stage startups that are still figuring out conversion problems, Fullstory gives you faster qualitative answers, while Amplitude takes over once you need to scale quantitative experimentation.
Quick Comparison Table
| Feature | Amplitude | Fullstory |
|---|---|---|
| Pricing (starting) | Free tier; paid from ~$49/month | Free tier; paid from ~$199/month |
| Free tier | Yes, up to 1M events/month | Yes, limited to ~1,000 sessions/month |
| Best for | Product analytics, retention, growth experiments | Session replay, UX research, bug diagnosis |
| Key strength | Behavioral cohorts and funnel depth | Visual replay of real user sessions |
| Biggest weakness | Steep learning curve for non-analysts | Limited quantitative analytics depth |
| Learning curve | Moderate to steep | Low to moderate |
| Integrations (approx.) | 80+ | 50+ |
| Customer support | Email, docs, community; dedicated CSM on enterprise | Email, in-app chat; dedicated CSM on enterprise |
What Amplitude Does Well
Amplitude is purpose-built for product analytics. If you ship software and need to understand how people move through your product over time, it is one of the most capable tools available without going full data warehouse.
The free Starter plan covers up to 1 million events per month, which is enough for most early-stage products to get real value. Paid plans start at around $49/month for the Plus tier, though teams that need advanced features like behavioral cohorts, predictive analytics, or A/B experiment analysis typically end up on the Growth or Enterprise tier, both of which are custom-quoted.
Here is where Amplitude consistently outperforms the competition:
- Funnel analysis. You can build multi-step funnels, break them down by any property, and compare conversion rates across time periods or user segments without writing a single SQL query.
- Retention charts. Amplitude’s retention reporting is precise. You can measure N-day, unbounded, and bracket retention, which matters when you are trying to understand if a new feature actually brings users back.
- Behavioral cohorts. Define a group of users by what they did or did not do, then use that cohort as a filter across any chart in your workspace.
- Experiment analysis. The built-in experiment tab connects to your A/B testing setup and shows statistical significance with the same behavioral metrics you already track.
- Data governance. Schema management, event blocking, and property transformation tools help you keep your tracking clean as the team grows.
You should pick Amplitude if you are a product manager, growth analyst, or startup founder who needs to run structured experiments and understand user retention with precision. It rewards analysts who take the time to set it up correctly. See our product analytics tools guide for a broader comparison of tools in this space.
What Fullstory Does Well
Fullstory approaches analytics from the opposite direction. Rather than asking you to define events upfront, it records user sessions automatically and lets you search and replay what actually happened on your site or app.
The free plan is limited to roughly 1,000 sessions per month, which is tight but enough to validate the tool before committing. Business plans start at around $199/month, and pricing scales with session volume. Enterprise pricing is custom and typically includes longer data retention, SSO, and more admin controls.
What makes Fullstory worth that price for the right team:
- Session replay. Watch real users navigate your product, including rage clicks, dead clicks, and mouse movement patterns. You find bugs and friction points that never show up in a funnel chart.
- Heatmaps and click maps. See aggregate click patterns across any page without configuring a separate tool.
- Autocapture. Fullstory captures all interactions by default. You do not need to plan an event taxonomy before you start collecting data, which is a practical advantage for teams that move fast.
- Frustration signals. The platform automatically surfaces moments of user frustration, like repeated failed clicks or rapid scrolling, so you can triage UX issues without watching every recording manually.
- Session search. You can filter recordings by any attribute, including custom user properties, which means you can pull sessions from users who churned within 30 days and watch exactly what happened.
Fullstory is the better fit for UX researchers, conversion rate optimizers, and support teams that need to reproduce and diagnose user problems quickly. It is also a natural tool for e-commerce teams optimizing checkout flows. For more on CRO-focused tools, check out our best session replay tools comparison.
Head-to-Head Comparison
Pricing and Value
Amplitude’s free tier is genuinely useful at 1 million events per month. You can build funnels, retention charts, and behavioral cohorts without paying a dollar until you hit scale. The Plus plan at around $49/month adds more historical data and user-level analysis. The jump to Growth and Enterprise tiers can feel abrupt if you are a small team that suddenly needs features like experiment analysis or predictive audiences, because those are locked behind custom quotes.
Fullstory’s free tier is more restrictive. One thousand sessions per month disappears quickly on any site with meaningful traffic. The Business plan at around $199/month gives you more sessions and longer replay retention, but the cost scales with volume in a way that can surprise teams once they grow. If you have a high-traffic marketing site, Fullstory invoices can climb faster than expected.
On pure value per dollar at early stages, Amplitude’s free tier covers more analytical ground. At scale, both tools require enterprise negotiations.
Ease of Use
Fullstory wins on initial setup. Because it autocaptures everything, you install one snippet and start watching sessions the same day. There is no event planning, no taxonomy meetings, no waiting for engineering to tag interactions. The interface is visual and the learning curve is shallow enough that a non-technical marketer can find useful sessions within an hour.
Amplitude requires more upfront investment. You need to define what events matter, instrument them correctly, and maintain a clean event schema as your product evolves. The payoff is richer, more structured data over time, but the first few weeks feel slow. Amplitude does offer a free implementation review and onboarding resources, which helps, but you still need someone on your team who understands analytics fundamentals.
Integrations and Ecosystem
Amplitude connects to roughly 80 or more platforms including Segment, Braze, Intercom, Salesforce, Snowflake, and most major CDPs. Its bidirectional sync with data warehouses is a real advantage for teams that want Amplitude to be one layer in a broader data stack.
Fullstory integrates with about 50 or more tools and connects well with support platforms like Zendesk and Intercom, plus analytics tools like Google Analytics and Segment. The integrations feel narrower but are well-matched to Fullstory’s primary use cases. One notable feature is the Fullstory for Mobile SDK, which brings session replay to native iOS and Android apps, something Amplitude does not offer natively.
Performance and Scale
Both tools are cloud-hosted and handle enterprise volumes without issue. Amplitude is used by companies processing billions of events per day. Its query engine is fast for most common chart types, though complex behavioral queries on large datasets can take a few seconds.
Fullstory’s replay infrastructure is solid. Playback is smooth even for complex single-page app sessions. The search and filter speed across millions of sessions is one of its technical strengths.
Support and Documentation
Amplitude’s documentation is extensive. The help center, Amplitude Academy (their free learning platform), and community forum cover most questions you will run into during setup. Paid plans above the free tier get email support, and enterprise accounts get a dedicated customer success manager.
Fullstory’s support is responsive via in-app chat on paid plans. Their documentation is good but thinner than Amplitude’s, which reflects the simpler setup process. Enterprise accounts also get dedicated support.
Which One Wins for Your Use Case
Pick Amplitude If…
You are running a SaaS product and need to measure feature adoption, run A/B tests, and understand why users churn before they cancel. Amplitude is also the right call if you have a data team that wants to push product data into a warehouse and use Amplitude as the exploration layer on top of it. Teams that have already defined a solid event taxonomy and want to scale quantitative analysis will get more mileage out of Amplitude than any session replay tool.
Pick Fullstory If…
Your primary problem is figuring out why a specific page or flow is underperforming, and you need to see it rather than measure it. Fullstory is also the right tool if your team includes non-technical stakeholders who need to watch real user sessions to get buy-in for a redesign. E-commerce teams optimizing checkout, support teams reproducing user-reported bugs, and CRO specialists all tend to reach for Fullstory first. If mobile app session replay matters to you, Fullstory has native support and Amplitude does not.
Consider Something Else If…
You are a solopreneur running a content site or a very early pre-product startup and you need basic traffic and conversion data without the overhead of either platform. Simpler tools like Plausible, PostHog’s free tier, or even Google Analytics 4 may cover your needs at zero cost. Visit /category/growth/ for a broader roundup of analytics options across different budgets and use cases. If you need a pure heatmap tool without the session replay overhead, there are lighter alternatives worth considering.
Frequently Asked Questions
Does Amplitude have a free plan in 2026?
Yes. The Amplitude Starter plan is free and includes up to 1 million events per month. It covers core features like funnels, retention charts, and user-level analysis, which makes it one of the most generous free tiers in product analytics.
Does Fullstory offer a free tier?
Fullstory has a free plan, but it caps at roughly 1,000 sessions per month. That is enough to evaluate the tool on a low-traffic product or a specific user segment, but most teams will hit the limit quickly and need to upgrade.
Which tool is easier to learn?
Fullstory has a significantly lower learning curve because it requires no event instrumentation. You install a snippet and start watching sessions. Amplitude rewards you with more power over time, but it takes longer to set up correctly and assumes some familiarity with analytics concepts.
Can you migrate from one tool to the other?
You can run both tools simultaneously during a transition period, which is the safest approach. Historical session replay data from Fullstory is not portable to Amplitude, and your Amplitude event schema does not transfer to Fullstory. Plan on a fresh start with whichever tool you switch to, and keep the old account active until you are confident in the new setup.
What kind of customer support do you get on paid plans?
Both tools offer email support on entry-level paid plans and dedicated customer success managers at the enterprise level. Amplitude has a larger self-serve documentation library and a community forum. Fullstory offers in-app chat support on Business plans, which tends to be faster for urgent one-off questions.
Bottom Line
Amplitude and Fullstory solve different problems. Amplitude tells you what your users are doing at scale, with the statistical depth to run experiments and measure retention over months. Fullstory shows you exactly how individual users behave on screen, which is faster for diagnosing friction and reproducing bugs.
For most product teams, Amplitude is the better long-term investment once you have product-market fit and a defined tracking plan. For teams still iterating on UX, optimizing conversion funnels, or supporting customers who hit errors, Fullstory delivers faster answers with less setup.
If your team sits squarely in the product analytics camp and needs retention and experimentation data, Amplitude is the clear winner here. Want to try Amplitude? Start with Amplitude and see if it fits your workflow.