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FullStory excels in customer journey analysis, making it a popular choice among marketers and product managers working on enterprise-level projects. It’s ideal for tracking how visitors move through websites and online funnels with complex visitor journeys, such as websites with lots of pages or eCommerce stores with lots of product categories.
Sessionstack, through a combination of pixel-perfect session replay, practical error logs, sitewide click trends, and real-time co-browsing tools enables UX designers, developers, and customer support teams to get impeccable insights into how users are finding their way on your platform, quickly identify and resolve frustrations, and improve user experience overall.
In this article, I compare FullStory vs SessionStack in five key areas:
I’ll also touch on site loading speed impact and integrations to give you the full picture and help you make the right decision for your needs. While I haven’t written specific sections on these two topics, I included them in the overview table below:
14-day trial + option to switch to free plan after it ends. Pricing isn’t disclosed but users report it starts at $299/mo. Session amount isn’t disclosed.
Has the best free plan. The starter plan costs $79/mo for 300+ daily sessions and the Scale plan is $129/mo for over 800.
Live replays for online users with basic error logs and different user states (active, inactive & offline). Basic action logs.
Everything in FullStory + high-speed and powerful live co-browsing features + dedicated error tracking space.
Can be used for co-browsing with live session replays but has very high latency (measured > 8 seconds) and no tools.
Sub-1-second full co-browsing features with user interaction tools like control takeover.
Page-specific visual click and scroll maps. Tracks rage clicks, dead clicks, and error clicks with segmentation tools.
Stands out with site-wide click tracking that surfaces page elements that cause the most dead clicks and rage clicks.
|Customer Journey Analysis|
Has all the key features of SessionStack and the most event types for creating highly customized funnels.
Can create funnels with four events and no step limit. Maps basic user journeys to identify problematic site elements.
|Site Speed Impact|
Reported ~657ms average page speed impact across the web. Impacts main thread execution.
20 native integrations + FullStory API + Zapier
14 native integrations + SessionStack API
|256 reviews with 4.5 Rating||63 reviews with 4.9 Rating|
|KeyBank, JetBlue, SoundCloud, Mammut, l’Occitane||Kraken, Bazaarvoice, Imagine.ai, Mend, Texas.gov|
|Tracking the movement of visitors through your website and online funnels.||Identifying user frustration points with your app or website.|
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In 2014, former Google engineer Scott Voigt, teamed up with two former colleagues to create an app. After getting their first trickle of customers, they soon realized the need for a tool that could analyze customer journeys. And so, FullStory was born.
Today, FullStory is well-established in the digital experience space with tools like heatmaps, session replays, and customer journey analytics — everything you need to know to remove the guesswork from learning how customers interact with your online content. It records and indexes all user sessions and interactions, and supports live viewing. But its stand-out feature is the in-depth funnel analysis tool that lets you set up and track complex funnels and track user journeys through your site.
FullStory is well-rounded but lacks co-browsing features. It also isn’t the best for identifying software errors and user frustration signals but it’s the best choice if you need a platform for customer journey analysis, which is why it’s popular with brands like KeyBank, JetBlue, and BlueNile.
SessionStack’s founder Alexander Zlatkov was a software engineer at Progress where he built products and helped customers resolve problems with their apps. He noticed there weren’t many good tools to help understand how users interact with online apps, so he set out to create one in 2016.
SessionStack stands out with session replays, co-browsing, error logs, and user action segmentation because it’s purpose-built for identifying errors and user frustrations for websites and apps. Trusted by brands like Kraken.com, Bazaarvoice, and Imagine.ai, it supports a variety of use cases and teams: product management, development, customer support, and more.
FullStory tracks the most user actions, while SessionStack stands out with co-browsing and error logs
Session Replay is a feature that allows you to record and playback user interactions on your website, capturing everything from mouse movements, clicks, and scrolls to form inputs and page navigations. It’s crucial for understanding user behavior and optimizing the customer experience.
In this section, we compare the tools’ session replay capabilities, specifically their:
SessionStack’s interface stands out for its user-friendly design, featuring a simple two-column layout with bold and large icons that make navigation a breeze.
The action log on the left side of the screen is synchronized with the session replay, allowing you to easily follow along and pinpoint specific user actions (such as clicks, rage clicks, dead clicks, errors, etc.). This design makes workflows in SessionStack very fast even for long sessions — you can jump on a replay with a specific issue in mind and find it within seconds.
FullStory’s interface is minimalistic with toned-down colors. The key difference is that it’s more feature-dense which makes it feel cluttered and overwhelming. As a result, FullStory has a steeper learning curve.
EDITOR’S NOTE: What is user segmentation?
User segmentation (or ‘Audience segmentation’) allows businesses to categorize their users based on specific criteria (such as demographics, behavior, and even new vs returning users). This is vital for understanding how different users perceive your website, and helping you make your UI/UX perfect for everyone.
SessionStack’s implementation of user segments is simple and straightforward, allowing even non-technical users to easily navigate and create segments.
You can build and save multiple customer segments with specific users, sessions, and event filters — providing a comprehensive overview of user behavior and engagement on your app.
FullStory’s user segments and trends are very similar to SessionStack: both platforms allow users to create segments based on user behavior, session data, and event tracking. The key difference is that FullStory has slightly more filter options for analyzing user actions.
EDITOR’S NOTE: What are live sessions?
Live sessions allow you to view real users who are currently active on your website in real-time. In theory, this feature gives your product, development, and customer support teams the ability to immediately identify issues and provide assistance to your users.
FullStory offers basic live session functionality, with user actions on the right, the replay in the middle, and replay options on the bottom of the screen.
The biggest issue with FullStory’s live sessions, though, is large latencies (in our case it was around 8 seconds), which make live sessions essentially just “fresh” recent recordings.
This can still be useful for quickly identifying issues, but it doesn’t let you interact with users and help them resolve usability problems in true real-time.
SessionStack, on the other hand, does have true real-time live sessions since its latency is consistently under 1 second. And in the next section, we’ll see that this allowed SessionStack to build a whole new feature on top of live sessions, that takes customer support to the next level — co-browsing.
Co-browsing is an additional feature on top of live sessions, that allows you to join user sessions and provide guidance in real-time, without users having to install any additional software, plugins, or add-ons.
Co-browsing is not the same as screen sharing. It doesn’t require any third-party downloads or installations and is browser-based, meaning you don’t see the entire screen, just a single browser tab. To understand the difference, you can read more about it in our article on co-browsing.
Co-browsing is possible only when live sessions are truly real-time — with delays of less than a second. Since SessionStack is the only tool on the market with less than 1-second delays, it is also the only true co-browsing tool.
In SessionStack’s co-browsing mode, you get access to three tools :
In SessionStack, the co-browsing experience is smooth and fast, with latencies of less than one second on both ends. It’s also completely secure, as users can mask sensitive data (like credit card details and login information) preventing it from being sent over to the agent.
Co-browsing is perfect for customer support teams when onboarding or resolving issues alongside a phone call, chat session, or email conversation to provide timely, personalized service in real-time.
FullStory logs events & error logs with your site in the session replay views. It also has filters and a search bar to help you make sense of the data.
Meanwhile, SessionStack has a dedicated space for events and error logs. It lets you see individual errors across the whole site  and analyze individual errors in-depth  as presented in the screenshot below.
Each event or error log is linked to a specific timestamp in a session replay . When you click the Play button, the session replay starts and pauses right at the point where the error occurred  — allowing you to immediately see how users discovered bugs. From here, you can pull up the console to view more details about the error .
Winner: SessionStack. In addition to the recorded sessions, live user sessions, and segmentation, you can interact with users via their browsers in real-time using co-browsing tools. It also supports developers and product designers with powerful error identification and logging features.
FullStory for user behavior insights, and SessionStack for solving issues across the whole site
Heatmaps are visual representations of user interactions on a webpage, showing which areas receive the most activity (such as clicks, mouse movements, and scrolls). They help you identify popular elements, areas of frustration, and potential opportunities for improvement.
However, heatmaps sometimes lack precision, as they provide an aggregated view of user interactions, and don’t address dynamic elements such as dropdown menus. Clickmaps, although not visual in nature, do show the exact elements that receive the most clicks, dead clicks (clicks on elements that don’t do anything), and rage clicks (multiple clicks on an element in quick succession), offering a clearer understanding of user behavior and potential issues.
In addition to the quantitative metrics  like users, page views, clicks, median time & scroll depth, you also get a visual representation of the most clicked areas on your page (click maps ) and scroll depths (scroll maps ).
In addition, click maps offer the additional feature of filtering by dead clicks, rage clicks, and error clicks. However, a drawback with FullStory is that you have to analyze each page separately as it doesn’t offer sitewide web analytics.
SessionStack does not offer visual heatmaps because those lack precision when it comes to tracking dynamic elements like drop down menus. Instead, it compiles user data by html element to quickly surface the top 10 sitewide results for the:
By default, these results are shown for all users who visit your site. But you can filter them by setting up custom filters (which we have already discussed in the User Segmentation section.)
The great thing about SessionStack’s approach to mapping user actions is that you instantly see which HTML elements on your site or app need attention, without having to look through each page separately. That’s because it also tracks how users interact with dynamic elements like hidden menus, which traditional heatmaps don’t record. Combine that with user segments and you get a powerful tool for quickly analyzing sitewide user behavior.
Verdict: FullStory has the best toolkit for deriving insights from individual user behavior, while SessionStack is best for quickly identifying, prioritizing, and solving sitewide issues on websites or apps.
SessionStack gives more options and scope, while FullStory provides the best insights
Customer journeys are analyzed using Funnels: tools for tracking how users navigate your site. You can set them up by defining which events cause users to “progress” down the funnel (for example, page visits on a specific URL), effectively segmenting your users based on which parts of the site they interacted with. Here’s an example of a funnel:
SessionStack lets you add infinite events to the event chain, with two additional events to choose from: ‘Rage click’ and ‘Dead click’. This lets you keep track of more nuanced customer journeys and even identify problematic elements that prevented conversions or made customers drop off the site.
FullStory has all the key features of SessionStack. In addition, it also has more granular events that allow for more complex behavior tracking:
Winner: FullStory wins because it has the widest range of event options for building highly customized funnels. And it also lets you compare conversions side-by-side across multiple user groups.
FullStory’s pricing plans are hidden and SessionStack gives you the most value for money
SessionStack’s free plan gives you access to all features including unlimited projects, dev tools, advanced search filters, and segmentation features. Additionally, you get access to 1500 user sessions/month (about 50 sessions/day), 3 team seats, and 10 live and co-browsing sessions.
FullStory has a free plan that you can switch to after your 14-day trial of their Business plan (lowest paid tier) ends.
FullStory has key features unlocked on its business plan. However, just like the pricing model, the total number of sessions allowed on each plan is not publicly available on their site. Some users have disclosed that pricing plans start at a minimum of $299/month.
Unlike FullStory, SessionStack unlocks all of its features on the free plan. The starter plan costs $79/month for 10.000 monthly sessions (an average of 300+ daily sessions) across unlimited websites.
SessionStack’s higher-tier plans – Scale and the custom plan for Enterprises – are much more affordable FullStory while unlocking even more quality features for large teams:
|SessionStack Scale ($129/month)||SessionStack Enterprise (Custom)|
|SessionStack Starter + 25,000 monthly sessions + Data export via REST API + Web call support||SessionStack Scale + Custom no. of sessions + Single Sign-on + Self-hosted deployment + Dedicated support|
Winner: SessionStack has the best free plan and its launch plan includes 10.000 monthly sessions across unlimited sites for $79/month.
|FullStory Pros||FullStory Cons|
|✅ Records all user sessions||❌ No co-browsing features|
|✅ View live sessions||❌ Non-transparent pricing|
|✅ Compatible with mobile apps||❌ Cluttered interface|
|✅ Highest number of funnel event triggers for advanced journey mapping||❌ Steep learning curve|
|✅ Error console available|
|✅ Extensive integrations including Google Analytics|
|SessionStack Pros||SessionStack Cons|
|✅ Generous free plan||❌ No annotation in session replay|
|✅ Affordable pricing plans||❌ Does not have page-specific heatmaps|
|✅ Extremely easy to set up and navigate||❌ Can’t track every user event with funnels|
|✅ Pixel-perfect session replays|
|✅ Very lightweight and doesn’t affect site speed|
|✅ Super fast co-browsing tools|
|✅ Dedicated error tracking page|
|Best for: Marketers that need a tool to understand customer journeys and collect user conversion data.||Best for: Product teams and developers who need granular insights on user interaction with apps and sites. Customer support teams that want to offer the best service to users.|
FullStory has the most extensive funnel creation, analytics, and reporting features, making it best for customer journey analysis. Then there’s SessionStack with its advanced session replay, co-browsing, and error-tracking features for identifying app or site issues and helping customers resolve problems in real time.
Use FullStory if:
Use SessionStack if:
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