GitLab vs. Harness vs. Optimizely Web Experimentation

Overview
ProductRatingMost Used ByProduct SummaryStarting Price
GitLab
Score 8.7 out of 10
N/A
GitLab is an intelligent orchestration platform for DevSecOps, where software teams enable AI at every stage of the software lifecycle to ship faster. The platform enables teams to automate repetitive tasks across planning, building, securing, testing, deploying, and maintaining software.
$0
per month per user
Harness
Score 8.1 out of 10
N/A
Harness, from the company of the same name in San Francisco, is a Continuous Delivery-as-a-Service platform designed to provide a simple, safe and secure way for engineering and DevOps teams to release applications into production. Founded in 2016, Harness uses machine learning to detect the quality of deployments and automatically roll back failed ones, saving time and reducing the need for custom scripting and manual oversight.N/A
Optimizely Web Experimentation
Score 8.7 out of 10
N/A
Whether launching a first test or scaling a sophisticated experimentation program, Optimizely Web Experimentation aims to deliver the insights needed to craft high-performing digital experiences that drive engagement, increase conversions, and accelerate growth.N/A
Pricing
GitLabHarnessOptimizely Web Experimentation
Editions & Modules
GitLab Free (self-managed)
$0
GitLab Free
$0
GitLab Premium
$29
per month per user
GitLab Premium (self-managed)
$29
per month per user
GitLab Ultimate
Contact Sales
GitLab Ultimate (self-managed)
Contact Sales
No answers on this topic
No answers on this topic
Offerings
Pricing Offerings
GitLabHarnessOptimizely Web Experimentation
Free Trial
YesYesYes
Free/Freemium Version
YesNoNo
Premium Consulting/Integration Services
YesNoYes
Entry-level Setup FeeOptionalNo setup feeOptional
Additional DetailsGitLab Credits enable flexible, consumption-based access to agentic AI capabilities in the GitLab platform, allowing you to scale AI adoption at your own pace while maintaining cost predictability. Powered by Duo Agent Platform, GitLab’s agentic AI capabilities help software teams to collaborate at AI speed, without compromising quality and enterprise security. If usage exceeds monthly allocations and overage terms are accepted, automated on-demand billing activates without service interruption, so your developers never lose access to AI capabilities they need. Real-time dashboards provide transparency into AI consumption patterns. Software teams can see usage across users, projects, and groups with granular attribution for cost allocation. Automated threshold alerts facilitate proactive planning. Advanced analytics deliver trending, forecasting, and FinOps integration.
More Pricing Information
Community Pulse
GitLabHarnessOptimizely Web Experimentation
Considered Multiple Products
GitLab

No answer on this topic

Harness

No answer on this topic

Optimizely Web Experimentation
Chose Optimizely Web Experimentation
I don't have alot of experience with an alternative such as Adobe Target. To be fair, I'm happy and satisfied with Optimizely.
Features
GitLabHarnessOptimizely Web Experimentation
Testing and Experimentation
Comparison of Testing and Experimentation features of Product A and Product B
GitLab
-
Ratings
Harness
-
Ratings
Optimizely Web Experimentation
8.0
163 Ratings
5% below category average
a/b experiment testing00 Ratings00 Ratings9.0163 Ratings
Split URL testing00 Ratings00 Ratings8.5135 Ratings
Multivariate testing00 Ratings00 Ratings8.4139 Ratings
Multi-page/funnel testing00 Ratings00 Ratings7.9126 Ratings
Cross-browser testing00 Ratings00 Ratings8.197 Ratings
Mobile app testing00 Ratings00 Ratings8.175 Ratings
Test significance00 Ratings00 Ratings8.4147 Ratings
Visual / WYSIWYG editor00 Ratings00 Ratings8.1133 Ratings
Advanced code editor00 Ratings00 Ratings8.0125 Ratings
Page surveys00 Ratings00 Ratings6.217 Ratings
Visitor recordings00 Ratings00 Ratings8.418 Ratings
Preview mode00 Ratings00 Ratings7.6145 Ratings
Test duration calculator00 Ratings00 Ratings7.8112 Ratings
Experiment scheduler00 Ratings00 Ratings8.2112 Ratings
Experiment workflow and approval00 Ratings00 Ratings7.890 Ratings
Dynamic experiment activation00 Ratings00 Ratings7.574 Ratings
Client-side tests00 Ratings00 Ratings7.896 Ratings
Server-side tests00 Ratings00 Ratings7.250 Ratings
Mutually exclusive tests00 Ratings00 Ratings8.180 Ratings
Audience Segmentation & Targeting
Comparison of Audience Segmentation & Targeting features of Product A and Product B
GitLab
-
Ratings
Harness
-
Ratings
Optimizely Web Experimentation
8.2
152 Ratings
7% below category average
Standard visitor segmentation00 Ratings00 Ratings8.4147 Ratings
Behavioral visitor segmentation00 Ratings00 Ratings7.7122 Ratings
Traffic allocation control00 Ratings00 Ratings9.1144 Ratings
Website personalization00 Ratings00 Ratings7.8111 Ratings
Results and Analysis
Comparison of Results and Analysis features of Product A and Product B
GitLab
-
Ratings
Harness
-
Ratings
Optimizely Web Experimentation
8.3
149 Ratings
4% below category average
Heatmap tool00 Ratings00 Ratings9.313 Ratings
Click analytics00 Ratings00 Ratings8.833 Ratings
Scroll maps00 Ratings00 Ratings8.517 Ratings
Form fill analysis00 Ratings00 Ratings8.072 Ratings
Conversion tracking00 Ratings00 Ratings8.744 Ratings
Goal tracking00 Ratings00 Ratings8.2127 Ratings
Test reporting00 Ratings00 Ratings7.9137 Ratings
Results segmentation00 Ratings00 Ratings7.7103 Ratings
CSV export00 Ratings00 Ratings7.9102 Ratings
Experiments results dashboard00 Ratings00 Ratings8.049 Ratings
Best Alternatives
GitLabHarnessOptimizely Web Experimentation
Small Businesses
GitGuardian
GitGuardian
Score 9.0 out of 10
GitLab
GitLab
Score 8.8 out of 10
Convert Experiences
Convert Experiences
Score 9.9 out of 10
Medium-sized Companies
Veracode
Veracode
Score 8.8 out of 10
GitLab
GitLab
Score 8.8 out of 10
Dynamic Yield
Dynamic Yield
Score 9.0 out of 10
Enterprises
Veracode
Veracode
Score 8.8 out of 10
GitLab
GitLab
Score 8.8 out of 10
Dynamic Yield
Dynamic Yield
Score 9.0 out of 10
All AlternativesView all alternativesView all alternativesView all alternatives
User Ratings
GitLabHarnessOptimizely Web Experimentation
Likelihood to Recommend
8.3
(152 ratings)
-
(0 ratings)
8.7
(253 ratings)
Likelihood to Renew
9.0
(5 ratings)
-
(0 ratings)
9.4
(51 ratings)
Usability
10.0
(6 ratings)
-
(0 ratings)
10.0
(58 ratings)
Availability
-
(0 ratings)
-
(0 ratings)
10.0
(7 ratings)
Performance
9.0
(1 ratings)
-
(0 ratings)
7.3
(6 ratings)
Support Rating
10.0
(12 ratings)
-
(0 ratings)
10.0
(16 ratings)
Online Training
-
(0 ratings)
-
(0 ratings)
3.0
(1 ratings)
Implementation Rating
-
(0 ratings)
-
(0 ratings)
8.0
(11 ratings)
Configurability
-
(0 ratings)
-
(0 ratings)
6.0
(1 ratings)
Product Scalability
10.0
(1 ratings)
-
(0 ratings)
8.0
(162 ratings)
User Testimonials
GitLabHarnessOptimizely Web Experimentation
Likelihood to Recommend
GitLab
GitLab is good if you work a lot with code and do complex repository actions. It gives you a very good overview of what were the states of your branches and the files in them at different stages in time. It's also way easier and more efficient to write pipelines for CI\CD. It's easier to read and it's easier to write them. It takes fewer clicks to achieve the same things with GitLab than it does for competitor products.
Read full review
Harness
No answers on this topic
Optimizely
I think it can serve the whole spectrum of experiences from people who are just getting used to web experimentation. It's really easy to pick up and use. If you're more experienced then it works well because it just gets out of the way and lets you really focus on the experimentation side of things. So yeah, strongly recommend. I think it is well suited both to small businesses and large enterprises as well. I think it's got a really low barrier to entry. It's very easy to integrate on your website and get results quickly. Likewise, if you are a big business, it's incrementally adoptable, so you can start out with one component of optimizing and you can build there and start to build in things like data CMS to augment experimentation as well. So it's got a really strong a pathway to grow your MarTech platform if you're a small company or a big company.
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Pros
GitLab
  • GitLab excels in managing code versions, allowing easy tracking of changes, branch management, and merging contributions.
  • It helps maintain code stability and reliability, saving time and effort in the development or research workflow.
  • Powerful code review features, enabling collaboration and feedback among team members.
  • Robust project management features, including issue tracking, kanban boards, and milestones.
Read full review
Harness
No answers on this topic
Optimizely
  • The Platform contains drag-and-drop editor options for creating variations, which ease the A/B tests process, as it does not require any coding or development resources.
  • Establishing it is so simple that even a non-technical person can do it perfectly.
  • It provides real-time results and analytics with robust dashboard access through which you can quickly analyze how different variations perform. With this, your team can easily make data-driven decisions Fastly.
Read full review
Cons
GitLab
  • CI variables management is sometimes hard to use, for example, with File type variables. The scope of each variable is also hard to guess.
  • Access Token: there are too many types (Personal, Project, global..), and it is hard to identify the scope and where it comes from once created.
  • Runners: auto-scaled runners are for the moment hard to put in place, and monitoring is not easy.
Read full review
Harness
No answers on this topic
Optimizely
  • JavaScript is hard to implement sometimes especially for JQuery elements
  • ROI reporting should be part of the overall experimentation reporting
  • CMP integration: where we can easily show status of test on the HPT request
  • CMS integration
  • More widgets like social proof banners, etc.
Read full review
Likelihood to Renew
GitLab
I really feel the platform has matured quite faster than others, and it is always at the top of its game compared to the different vendors like GitHub, Azure pipelines, CircleCI, Travis, Jenkins. Since it provides, agents, CI/CD, repository hosting, Secrets management, user management, and Single Sign on; among other features
Read full review
Harness
No answers on this topic
Optimizely
I rated this question because at this stage, Optimizely does most everything we need so I don't foresee a need to migrate to a new tool. We have the infrastructure already in place and it is a sizeable lift to pivot to another tool with no guarantee that it will work as good or even better than Optimizely
Read full review
Usability
GitLab
I find it easy to use, I haven't had to do the integration work, so that's why it is a 9/10, cause I can't speak to how easy that part was or the initial set up, but day to day use is great!
Read full review
Harness
No answers on this topic
Optimizely
Optimizely Web Experimentation's visual editor is handy for non-technical or quick iterative testing. When it comes to content changes it's as easy as going into wordpress, clicking around, and then seeing your changes live--what you see is what you get. The preview and approval process for sharing built experiments is also handy for sharing experiments across teams for QA purposes or otherwise.
Read full review
Reliability and Availability
GitLab
I've never had experienced outages from GItlab itself, but regarding the code I have deployed to Gitlab, the history helps a lot to trace the cause of the issue or performing a rollback to go back to a working version
Read full review
Harness
No answers on this topic
Optimizely
I would rate Optimizely Web Experimentation's availability as a 10 out of 10. The software is reliable and does not experience any application errors or unplanned outages. Additionally, the customer service and technical support teams are always available to help with any issues or questions.
Read full review
Performance
GitLab
GItlab reponsiveness is amazing, has never left me IDLE. I've never had issues even with complex projects. I have not experienced any issues when integrating it with agents for example or SSO
Read full review
Harness
No answers on this topic
Optimizely
I would rate Optimizely Web Experimentation's performance as a 9 out of 10. Pages load quickly, reports are complete in a reasonable time frame, and the software does not slow down any other software or systems that it integrates with. Additionally, the customer service and technical support teams are always available to help with any issues or questions.
Read full review
Support Rating
GitLab
At this point, I do not have much experience with Gitlab support as I have never had to engage them. They have documentation that is helpful, not quite as extensive as other documentation, but helpful nonetheless. They also seem to be relatively responsive on social media platforms (twitter) and really thrived when GitHub was acquired by Microsoft
Read full review
Harness
No answers on this topic
Optimizely
They always are quick to respond, and are so friendly and helpful. They always answer the phone right away. And [they are] always willing to not only help you with your problem, but if you need ideas they have suggestions as well.
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Online Training
GitLab
No answers on this topic
Harness
No answers on this topic
Optimizely
The tool itself is not very difficult to use so training was not very useful in my opinion. It did not also account for success events more complex than a click (which my company being ecommerce is looking to examine more than a mere click).
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Implementation Rating
GitLab
No answers on this topic
Harness
No answers on this topic
Optimizely
In retrospect: - I think I should have stressed more demo's / workshopping with the Optimizely team at the start. I felt too confident during demo stages, and when came time to actually start, I was a bit lost. (The answer is likely I should have had them on-hand for our first install.. they offered but I thought I was OK.) - Really getting an understanding / asking them prior to install of how to make it really work for checkout pages / one that uses dynamic content or user interaction to determine what the UI does. Could have saved some time by addressing this at the beginning, as some things we needed to create on our site for Optimizely to "use" as a trigger for the variation test. - Having a number of planned/hoped-for tests already in-hand before working with Optimizely team. Sharing those thoughts with them would likely have started conversations on additional things we needed to do to make them work (rather than figuring that out during the actual builds). Since I had development time available, I could have added more things to the baseline installation since my developers were already "looking under the hood" of the site.
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Alternatives Considered
GitLab
Gitlab seems more cutting-edge than GitHub; however, its AI tools are not yet as mature as those of CoPilot. It feels like the next-generation product, so as we selected a tool for our startup, we decided to invest in the disruptor in the space. While there are fewer out-of-the-box templates for Gitlab, we have never discovered a lack of feature parity.
Read full review
Harness
No answers on this topic
Optimizely
The ability to do A/B testing in Optimizely along with the associated statistical modelling and audience segmentation means it is a much better solution than using something like Google Analytics were a lot more effort is required to identify and isolate the specific data you need to confidently make changes
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Scalability
GitLab
I think is very well designed, and like any VCS it works as intended
Read full review
Harness
No answers on this topic
Optimizely
We can use it flexibly across lines of business and have it in use across two departments. We have different use cases and slightly different outcomes, but can unify our results based on impact to the bottom line. Finally, we can generate value from anywhere in the org for any stakeholders as needed.
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Return on Investment
GitLab
  • GitLab cut down our spent on container, package and infrastructure registry
  • Best thing is we can now have everything in single platform which cost effective too
  • Quality of support is really good and they do have emergency support team as well which is great
Read full review
Harness
No answers on this topic
Optimizely
  • We're able to share definitive annualized revenue projections with our team, showing what would happen if we put a test into Production
  • Showing the results of a test on a new page or feature prior to full implementation on a site saves developer time (if a test proves the new element doesn't deliver a significant improvement.
  • Making a change via the WYSIWYG interface allows us to see multiple changes without developer intervention.
Read full review
ScreenShots

GitLab Screenshots

Screenshot of What is Intelligent Orchestration for DevSecOps?Screenshot of an overview of GitLab Duo Agent PlatformScreenshot of a new agent creation screen

Harness Screenshots

Screenshot of Harness

Optimizely Web Experimentation Screenshots

Screenshot of AI-Powered Experimentation with Opal:

- Instant Test Ideas: Generates high-quality A/B test ideas based on any goals and audience insights.
- Smarter Experimentation: The AI can suggest impactful variations, reducing guesswork and increasing test velocity.
- More Than Just Ideas: From hypothesis generation to analyzing results, Opal helps optimize every stage of the experimentation process.Screenshot of the Web Experimentation Visual Editor :

- Tweak experiments using the visual editor or dive into custom code when needed.
- Modify elements, update styling, or add dynamic behaviors.
- Ensure perfect variations while keeping control over every detail of the experiment.Screenshot of AI Content Suggestions:

- Generates copy variations to supercharge experiments.
- The AI suggests high-impact messaging for tests when hovering over a field.
- AI-powered content suggestions help skip the brainstorming process.Screenshot of Advanced Audience Targeting:

- Delivers personalized experiences by targeting users based on behaviors, attributes, and real-time conditions.
- Defines precise audience segments using first-party data, geolocation, and device type.
- Can test and optimize for different audience groups to maximize impact and engagement.Screenshot of Custom Templates in the Visual Editor:

- Offers pre-built templates for common test setups.
- Standardized variations and maintains brand integrity with reusable templates.
- Templates can be customized visually or tweak them with code for full flexibility.Screenshot of the Web Experimentation Results Page:

- Data visualizations help interpret experiment performance.
- Displays which variations are winning with built-in statistical significance calculations.
- Results can be filtered by audience segments, events, and conversions to uncover key trends.