--- title: Closure Compiler Reviews meta_title: 'Closure Compiler Reviews 2026: Details, Pricing, & Features | G2' meta_description: Filter 13 reviews by the users' company size, role or industry to find out how Closure Compiler works for a business like yours. aggregate_rating: rating_value: 3.9 review_count: 13 scale: '5' date_modified: '2026-09-22' parent_category: name: "DevSecOps\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t" url: https://www.g2.com/categories/devsecops --- # Closure Compiler Reviews **Vendor:** Google **Category:** [Static Code Analysis Tools](https://www.g2.com/categories/static-code-analysis) **Average Rating:** 3.9/5.0 **Total Reviews:** 13 **AI Enabled:** This product embeds AI to enhance or extend its core functionality. ## About Closure Compiler The Closure Compiler is a tool for making JavaScript download and run faster. Instead of compiling from a source language to machine code, it compiles from JavaScript to better JavaScript. ## Closure Compiler Reviews ### 1. Closure is a multipurpose compiler service helping to improve JS Code **Rating:** 3.5/5.0 stars **Reviewed by:** JAYARAJ J 1. | Developer, Enterprise (> 1000 emp.) **Current User:** The reviewer uploaded a screenshot or submitted the review in-app verifying them as current user. **Validated Reviewer:** Validated through Google using a business email account **Incentivized:** This reviewer was offered a nominal gift card as thank you for completing this review. **Source: G2 invite:** Invitation from G2. This reviewer was offered a nominal gift card as thank you for completing this review. **Reviewed Date:** July 13, 2021 **What do you like best about Closure Compiler?** Even though the readability of javascript code gets denied drastically, overall stability and optimization of the code become great is Closure Compiler service is used. As a developer, both of them are concerned regarding the implementation of a production-ready code. Hence using Closure cannot be recommended if code readability comes first, as compiled infrastructure might not be good **What do you dislike about Closure Compiler?** As an open-source tool supported by Google, Closure Compiler does do the work as to be expected, that is to cross-compile javascript code to save the size. But still, it converts to a non-readable format. When it comes to development, code readability is important. Also, Closure looks for type checks too! This is a good feature, and cleaning dead codes from the program will save the memory efficiently, hence when readability is not a major concern, benefits are more. **What problems is Closure Compiler solving and how is that benefiting you?** I solve the problem of having dead javascript code, this will save memory at compile time. Usually, when developing a big scaling application, this comes into play. Having simple ternary statements are far better than having a lot of if-else conditions. Hence the role of Closure Compiler can drastically impact code optimization. Most of the web frontends are based on Javascript, hence using Closure is highly recommended. This would improve performance as well. ### 2. Best Efficent Compiler for JS **Rating:** 4.5/5.0 stars **Reviewed by:** Sanjay K. | Head of content, Small-Business (50 or fewer emp.) **Validated Reviewer:** Validated through a business email account **Incentivized:** This reviewer was offered a nominal gift card as thank you for completing this review. **Source: G2 invite:** Invitation from G2. This reviewer was offered a nominal gift card as thank you for completing this review. **Reviewed Date:** July 08, 2021 **What do you like best about Closure Compiler?** Easy command-line execution, and efficient compiler to run the JS files by taking care of the size. Bug efficiency too helps to develop clean applications with fewer reported crashes and issues comparatively. File size reduction also helps the faster execution of the program. Opensource it is. **What do you dislike about Closure Compiler?** Auto-update is not a thing here, need to manually perform those actions. The UI is not appealing to the user to do more. **Recommendations to others considering Closure Compiler:** This is the best for running javascript applications with minimal execution errors. Validating code is pretty straightforward with this. **What problems is Closure Compiler solving and how is that benefiting you?** To execute Application build on Java script using CMD, alerting features on code execution and syntax. ### 3. It does what it says. Simple tool for increasing efficiency **Rating:** 2.5/5.0 stars **Reviewed by:** Arpit J. | Assistant Manager, Mid-Market (51-1000 emp.) **Validated Reviewer:** Validated through a business email account **Incentivized:** This reviewer was offered a nominal gift card as thank you for completing this review. **Source: G2 invite:** Invitation from G2. This reviewer was offered a nominal gift card as thank you for completing this review. **Reviewed Date:** July 12, 2021 **What do you like best about Closure Compiler?** The user interface is very simple and easy to use, which is the most liked part about it. **What do you dislike about Closure Compiler?** Sometimes it's not easy to locate the javascript processed by closure which makes it very irritating and challenging to deal with. **Recommendations to others considering Closure Compiler:** Only take this software if you are a small and mid-size organization. **What problems is Closure Compiler solving and how is that benefiting you?** We are solving our fundamental coding issues at the lower level of the organization. ### 4. Well designed tool **Rating:** 5.0/5.0 stars **Reviewed by:** Nitya M. | Lead IVR Developer, Enterprise (> 1000 emp.) **Validated Reviewer:** Validated through LinkedIn **Incentivized:** This reviewer was offered a nominal gift card as thank you for completing this review. **Source: G2 invite:** Invitation from G2. This reviewer was offered a nominal gift card as thank you for completing this review. **Reviewed Date:** August 03, 2021 **What do you like best about Closure Compiler?** Automatically check my code syntax and variable references. **What do you dislike about Closure Compiler?** Not able to find anything yet as dislikes **What problems is Closure Compiler solving and how is that benefiting you?** My code syntax checked and variable references check. Also it help me to remove my dead code. ### 5. Easy and faster **Rating:** 3.5/5.0 stars **Reviewed by:** Sunil b. | Senior Test engineer, Mid-Market (51-1000 emp.) **Validated Reviewer:** Validated through a business email account **Incentivized:** This reviewer was offered a nominal gift card as thank you for completing this review. **Source: G2 invite:** Invitation from G2. This reviewer was offered a nominal gift card as thank you for completing this review. **Reviewed Date:** November 03, 2020 At G2, we prefer fresh reviews and we like to follow up with reviewers. They may not have updated their review text, but have updated their review. **What do you like best about Closure Compiler?** - The best helpful thing about closure compiler is that it helps in parsing your JavaScript in the fastest way possible and helps in removing unwanted codes - It will help us in creating smaller JavaScript bundles **What do you dislike about Closure Compiler?** - The latest JAVA version should be automatically detected and parsed - It will increase the build time significantly **What problems is Closure Compiler solving and how is that benefiting you?** Nothing to disclose here ### 6. A great compiler **Rating:** 4.0/5.0 stars **Reviewed by:** Verified User in Online Media | Enterprise (> 1000 emp.) This reviewer's identity has been verified by our review moderation team. They have asked not to show their name, job title, or picture. **Current User:** The reviewer uploaded a screenshot or submitted the review in-app verifying them as current user. **Validated Reviewer:** Validated through a business email account **Incentivized:** This reviewer was offered a nominal gift card as thank you for completing this review. **Source: G2 invite:** Invitation from G2. This reviewer was offered a nominal gift card as thank you for completing this review. **Reviewed Date:** January 31, 2019 **What do you like best about Closure Compiler?** Efficiency. The Closure Compiler reduces the size of your JavaScript files and makes them more efficient, helping your application to load faster and reducing your bandwidth needs. Code checking. The Closure Compiler provides warnings for illegal JavaScript and warnings for potentially dangerous operations, helping you to produce JavaScript that is less buggy and easier to maintain. **What do you dislike about Closure Compiler?** You can use the Closure Compiler as: An open source Java application that you can run from the command line. A simple web application. A RESTful API. To get started with the compiler, see "How do I start" below. **Recommendations to others considering Closure Compiler:** The Closure Compiler is a tool for making JavaScript download and run faster. Instead of compiling from a source language to machine code, it compiles from JavaScript to better JavaScript. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. **What problems is Closure Compiler solving and how is that benefiting you?** -The Closure Compiler is a tool for making JavaScript download and run faster. Instead of compiling from a source language to machine code, it compiles from JavaScript to better JavaScript. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls ### 7. JavaScript run faster!! **Rating:** 1.5/5.0 stars **Reviewed by:** Athul S. | devloper, Small-Business (50 or fewer emp.) **Current User:** The reviewer uploaded a screenshot or submitted the review in-app verifying them as current user. **Validated Reviewer:** Validated through LinkedIn **Incentivized:** This reviewer was offered a nominal gift card as thank you for completing this review. **Source: G2 invite:** Invitation from G2. This reviewer was offered a nominal gift card as thank you for completing this review. **Reviewed Date:** February 08, 2019 **What do you like best about Closure Compiler?** The Closure Compiler reduces the size of your JavaScript files and makes them more efficient, helping your application to load faster and reducing your bandwidth needs. And provides warnings for illegal JavaScript and warnings for potentially dangerous operations, helping you to produce JavaScript that is less buggy and easier to maintain. **What do you dislike about Closure Compiler?** Need network to compile the program properly. **What problems is Closure Compiler solving and how is that benefiting you?** An open source Java application that you can run from the command line. ### 8. Super simple to use! **Rating:** 4.5/5.0 stars **Reviewed by:** Verified User in Health, Wellness and Fitness | Small-Business (50 or fewer emp.) This reviewer's identity has been verified by our review moderation team. They have asked not to show their name, job title, or picture. **Current User:** The reviewer uploaded a screenshot or submitted the review in-app verifying them as current user. **Validated Reviewer:** Validated through LinkedIn **Incentivized:** This reviewer was offered a nominal gift card as thank you for completing this review. **Source: G2 invite:** Invitation from G2. This reviewer was offered a nominal gift card as thank you for completing this review. **Reviewed Date:** January 28, 2019 At G2, we prefer fresh reviews and we like to follow up with reviewers. They may not have updated their review text, but have updated their review. **What do you like best about Closure Compiler?** I love that this help make the script shorter and more understandable! it makes it so much faster to run Java as well! **What do you dislike about Closure Compiler?** The appearance and layout isn't super pleasing and distracts from the goal of the website. But overall, it is a minor issue. **Recommendations to others considering Closure Compiler:** Just go for it. If you are struggling with long code, this is your answer! **What problems is Closure Compiler solving and how is that benefiting you?** It is SO helpful for beginners who don't really know what they are doing! It makes it simple and easy to understand. ### 9. Efficient way to reduce the size of your JavaScript **Rating:** 4.5/5.0 stars **Reviewed by:** Verified User in Marketing and Advertising | Small-Business (50 or fewer emp.) This reviewer's identity has been verified by our review moderation team. They have asked not to show their name, job title, or picture. **Validated Reviewer:** Validated through LinkedIn **Incentivized:** This reviewer was offered a nominal gift card as thank you for completing this review. **Source: G2 invite:** Invitation from G2. This reviewer was offered a nominal gift card as thank you for completing this review. **Reviewed Date:** January 30, 2019 **What do you like best about Closure Compiler?** The code checking feature is very helpful. It warns for illegal JavaScript and warns for potentially dangerous operations. **What do you dislike about Closure Compiler?** Customer service has not been the best, takes a while to get a hold of someone. **Recommendations to others considering Closure Compiler:** Some great video tutorials on Youtube on how to use if you get confused on the process. **What problems is Closure Compiler solving and how is that benefiting you?** Reduces size of JavaScript files, helping apps loan faster and takes up less room on your hard drive. ### 10. Closure Complier is pretty good **Rating:** 4.0/5.0 stars **Reviewed by:** Verified User in Medical Practice | Small-Business (50 or fewer emp.) This reviewer's identity has been verified by our review moderation team. They have asked not to show their name, job title, or picture. **Validated Reviewer:** Validated through LinkedIn **Source: Seller invite:** Invitation from a seller or affiliate. This reviewer was not provided any incentive by G2 for completing this review. **Reviewed Date:** February 05, 2019 **What do you like best about Closure Compiler?** I like best how it functions as a tool for making JavaScript download and run faster. **What do you dislike about Closure Compiler?** I dislike how it is not always user-friendly. **What problems is Closure Compiler solving and how is that benefiting you?** Instead of compiling from a source language to machine code, it compiles from JavaScript to better JavaScript. It is very efficient by reducing the size of your JavaScript files and helping your application to load faster and reducing your bandwidth needs. ### 11. JavaScript inside JavaScript. **Rating:** 3.5/5.0 stars **Reviewed by:** Verified User in Information Services | Mid-Market (51-1000 emp.) This reviewer's identity has been verified by our review moderation team. They have asked not to show their name, job title, or picture. **Validated Reviewer:** Validated through LinkedIn **Source: Seller invite:** Invitation from a seller or affiliate. This reviewer was not provided any incentive by G2 for completing this review. **Reviewed Date:** January 31, 2019 **What do you like best about Closure Compiler?** Closure Compiler is good app and tool for making JavaScript download and run faster. Instead of compiling from a source language to machine code, it compiles from JavaScript to better JavaScript. **What do you dislike about Closure Compiler?** Maybe the parser is something worse than the rest of the applications. **What problems is Closure Compiler solving and how is that benefiting you?** Tested for future implementations that I ultimately do not perform. ### 12. Using Closer Compiler **Rating:** 4.5/5.0 stars **Reviewed by:** Verified User in Retail | Small-Business (50 or fewer emp.) This reviewer's identity has been verified by our review moderation team. They have asked not to show their name, job title, or picture. **Validated Reviewer:** Validated through LinkedIn **Incentivized:** This reviewer was offered a nominal gift card as thank you for completing this review. **Source: G2 invite:** Invitation from G2. This reviewer was offered a nominal gift card as thank you for completing this review. **Reviewed Date:** January 30, 2019 **What do you like best about Closure Compiler?** Program is easy to use and make computer work more efficient when using java script. **What do you dislike about Closure Compiler?** Nothing I can think of at this time. I like this program a lot. **What problems is Closure Compiler solving and how is that benefiting you?** Faster efficiency when using anything containing java script. Saves time to spend on other projects/tasks. ### 13. Closure Compiler **Rating:** 5.0/5.0 stars **Reviewed by:** Verified User in Information Technology and Services | Enterprise (> 1000 emp.) This reviewer's identity has been verified by our review moderation team. They have asked not to show their name, job title, or picture. **Validated Reviewer:** Validated through LinkedIn **Incentivized:** This reviewer was offered a nominal gift card as thank you for completing this review. **Source: G2 invite:** Invitation from G2. This reviewer was offered a nominal gift card as thank you for completing this review. **Reviewed Date:** April 26, 2018 **What do you like best about Closure Compiler?** I love how efficient this product makes the application as well as the warnings that it gives. It's like spell check for code! **What do you dislike about Closure Compiler?** It is an open source software which is both a good and bad thing. **Recommendations to others considering Closure Compiler:** Good product for coding. Helps a lot with making JavaScript less buggy and helps it run faster too. End users have seen improvements since we started using this product. **What problems is Closure Compiler solving and how is that benefiting you?** Really helped to improve efficiency and reduce errors ## Closure Compiler Discussions - [Which of the following are the three compilation levels that can be applied to the JavaScript code to define the degree of compression and optimization required?](https://www.g2.com/discussions/which-of-the-following-are-the-three-compilation-levels-that-can-be-applied-to-the-javascript-code-to-define-the-degree-of-compression-and-optimization-required) - [What is closure Google what is closure in JavaScript?](https://www.g2.com/discussions/what-is-closure-google-what-is-closure-in-javascript) - [Who uses Closure Library?](https://www.g2.com/discussions/who-uses-closure-library) - [How do you run a compiler closure?](https://www.g2.com/discussions/how-do-you-run-a-compiler-closure) - [View Closure Compiler pricing details and edition comparison](https://www.g2.com/products/closure-compiler/reviews?section=pricing&secure%5Bexpires_at%5D=2026-09-30+07%3A04%3A24+-0500&secure%5Bsession_id%5D=fb82e89c-96dc-48b0-ab9f-3af1c56fe9e2&secure%5Btoken%5D=281302684fa5c044d0f57e083c4e231f82f36240e810433343b8895b3e9e03ad&format=llm_user) ## Closure Compiler Features **Agentic AI - Static Code Analysis** - Adaptive Learning - Natural Language Interaction - Proactive Assistance ## Top Closure Compiler Alternatives - [Gearset DevOps](https://www.g2.com/products/gearset-devops/reviews) - 4.7/5.0 (305 reviews) - [Aikido Security](https://www.g2.com/products/aikido-security/reviews) - 4.6/5.0 (265 reviews) - [Babel](https://www.g2.com/products/babel/reviews) - 4.5/5.0 (20 reviews)