Which websites allow users to upvote or downvote content?

Several prominent online platforms and communities utilize an upvote/downvote (or score-based) mechanism to surface high-quality contributions and filter out low-value content.

• Reddit : The most famous example of a bidirectional voting culture. Users can upvote or downvote both submissions (posts) and comments, which directly alters the item's aggregate score and visibility.
• Stack Overflow : A Q&A community for programmers where users can upvote and downvote both questions and answers. Voting impacts the author's reputation score and determines the order in which answers appear.
• Quora : A knowledge-sharing platform where users can upvote answers they find helpful (and downvote poor or incorrect ones), shifting the best responses to the top.
• Product Feedback Boards (e.g., Upvoty and Feature Upvote) : Many SaaS tools and product development teams embed public feedback boards that allow users to submit feature requests and vote/downvote competing ideas to help prioritize roadmaps.

If you are looking to build or integrate a system like this yourself, let me know if you need help with database schema design or frontend implementation approaches.

Many websites let users upvote and/or downvote content to surface useful material and suppress low-quality material. Common examples include:

• Reddit — Users can upvote or downvote posts and comments; votes influence what gets surfaced in communities and feeds.
• Stack Overflow / Stack Exchange — Questions, answers, and comments can be upvoted; questions and answers can also be downvoted. Votes affect reputation and content ranking.
• Hacker News — Primarily an upvote system for submissions; downvoting is available for comments under certain account/karma requirements, rather than as a standard down-arrow on submissions.
• Product Hunt — Products are ranked partly through community upvotes, particularly during launches.
• Lobsters — A technology-focused social news site with voting on submitted stories and comments.
• Dev.to — Community members can react to and support posts, though its system is more reaction-oriented than Reddit's simple up/down model.
• Slashdot — Uses community moderation/rating of comments, including positive and negative ratings.
• Quora — Users can upvote answers and other content, affecting visibility and ranking.
• YouTube — Users can like or dislike videos and comments; this is effectively positive/negative voting, although YouTube doesn't expose a simple public net-vote score like Reddit.
• GitHub — Issues and discussions can receive reactions, including thumbs-up and thumbs-down-style feedback, although it isn't a traditional upvote/downvote ranking system.
• Indie Hackers — Community posts and discussions have voting/engagement mechanisms.

If you're specifically looking for sites with a true Reddit-style “↑ / ↓” voting system, the strongest examples are Reddit and Stack Exchange. Hacker News is similar but deliberately limits downvoting, while sites such as Product Hunt primarily use upvotes only.

Websites that feature upvoting and downvoting systems allow communities to curate and rank content based on quality and relevance.

• Reddit: A massive network of communities (subreddits) where users submit links, text, and images that can be upvoted or downvoted to determine visibility on the front page and feeds.
• Hacker News: A social news website focusing on computer science, technology, and entrepreneurship where users can upvote stories and comments (downvoting is unlocked at a specific karma threshold).
• Stack Overflow: A question-and-answer platform for programmers where users can upvote or downvote both questions and answers to reflect their technical accuracy and helpfulness.
• Product Hunt: A platform for sharing and discovering new tech products, hardware, and creative projects, allowing users to upvote their favorites to push them to the daily leaderboard.
• Quora: A question-and-answer site that includes an upvote feature for answers, though its downvote mechanism is less prominent and used mainly to hide low-quality or irrelevant responses.
• YouTube: Uses upvoting (likes) and downvoting (dislikes) on user comments and video content to gauge viewer reception and adjust recommendation algorithms.

Would you like to explore how karma and scoring systems work on one of these specific platforms, or are you looking for a website recommendation for a particular niche or project?

Yes. A number of websites let users vote content up or down, though the exact mechanics differ.

If you mean a true upvote/downvote system

The closest matches to Reddit are Reddit, Lemmy, Stack Exchange/Stack Overflow, and Slashdot. Stack Overflow explicitly describes upvotes as signals that content is useful and downvotes as signals that it is wrong, poorly researched, or otherwise low quality.

There is an important distinction between voting systems and simple like/dislike systems. For example, YouTube has Like/Dislike, but it doesn't use those votes in quite the same community-ranking/reputation-oriented way as Reddit or Stack Exchange.

If you're looking for websites where essentially any user can submit content and have the community upvote/downvote it, I can also give you a longer list of 20–50 such sites, including smaller Reddit alternatives.

Yes. A number of websites use upvotes and/or downvotes to let users collectively rank content.

A few important distinctions:

• Reddit is probably the clearest example: both posts and comments can be upvoted or downvoted, and voting affects their ranking. www.parse.gl 
• Stack Overflow/Stack Exchange has explicit voting on questions and answers. Downvoting is a higher-reputation privilege than upvoting, although Stack Overflow has experimented with "free votes" for newer users.
• Hacker News is unusual: submissions have upvotes but no normal downvote button; downvoting comments is restricted to users who meet a karma threshold.
• YouTube still has a Like/Dislike mechanism, but the public dislike count is hidden, so it isn't quite the same as Reddit's visible vote score.
• Digg historically used "digg" and "bury" votes, but the service was reported as defunct as of March 14, 2026, so I wouldn't count it as a current option.

If you're looking specifically for current websites where ordinary users can both upvote and downvote almost any user-submitted content, the strongest examples are Reddit, Stack Exchange, Lemmy, and Slashdot.

Here are some popular platforms and websites that feature a voting system allowing users to upvote or downvote content:

• Reddit : Known as the front page of the internet, it relies entirely on a community-driven upvote and downvote system (called karma) to rank posts and comments on Reddit.
• Stack Overflow : A Q&A platform for programmers where users can upvote or downvote both questions and answers to highlight helpful solutions and bury inaccurate ones on Stack Overflow.
• YouTube : Allows users to upvote (thumbs up) and downvote (thumbs down) video comments, as well as like or dislike the videos themselves.
• Product Hunt : A platform to discover new tech products where users upvote their favorite launches to push them to the daily leaderboard on Product Hunt.
• Hacker News : A tech-focused news aggregation and discussion site where users can upvote submissions and comments (downvoting requires a certain amount of user karma) on Hacker News.
• Quora : A question-and-answer website where users can upvote or downvote answers to sort the best responses to the top.
• GitHub : While primarily for code hosting, users can upvote/react with a thumbs-up emoji on issues, pull requests, and discussions to show support.

Would you like to know more about how voting algorithms work on any of these specific platforms, or are you looking for a website with this feature for a specific project or use case?

Several popular websites and platforms use an upvote and downvote system (or a close variation) to allow users to curate, rank, and moderate content:

• Reddit : The pioneer of the modern net-score system. Users can upvote or downvote both posts and comments, directly impacting a submission's visibility and the user's "karma".
• Quora : Allows users to upvote answers they find helpful or accurate and downvote poor or misleading answers, which adjusts where the response ranks on the page.
• Stack Exchange (including Stack Overflow ): A vast network of Q&A communities where users upvote great technical answers and downvote incorrect ones to push the best solutions to the very top.
• Hacker News : A tech and startup news aggregator run by Y Combinator. It features an upvote system for submissions and comments, though downvoting is restricted or tied to user account reputation rather than being universally available.
• Imgur : The image-hosting and community platform heavily tied to Reddit. Users can upvote or downvote user-submitted images and comments to drive content to the main viral gallery.
• 9GAG : A humor and meme platform where community members upvote or downvote posts to help determine whether content moves from fresh queues into "Trending" or "Hot".
• Product Hunt : A platform for discovering new tech and apps. Users upvote products they like, which shifts them higher on the daily and weekly leaderboards.
• Lemmy : A decentralized, open-source, Reddit-style federated platform where communities post and vote on links and discussions.

Are you looking for a platform to join and browse , or are you trying to add an upvote/downvote feature to your own website or app?

Several major websites let users upvote and/or downvote content, using community voting to influence ranking and visibility:

Reddit is probably the clearest example: its posts and comments have explicit upvote and downvote buttons, and votes help determine what gets surfaced.

Stack Overflow has an especially formal voting system: upvotes indicate useful content, while downvotes indicate problems with quality, accuracy, research effort, or usefulness. Votes also affect reputation and ranking.

Product Hunt is an example where voting is primarily positive—users upvote product launches, and those votes contribute to ranking/points.

If you're looking for websites specifically designed around an upvote/downvote model (rather than just sites that happen to have voting), I can give you a longer list of 20–50 examples.

Many websites and online platforms use a voting mechanism (upvoting and downvoting) to curate, rank, and moderate user-submitted content.

Here are the most prominent websites that feature upvoting and downvoting:

• Reddit : The pioneer of the modern upvote/downvote system. Users vote on posts and comments, which directly determines their visibility and the author's karma score.
• Quora : Allows users to upvote or downvote answers. Upvoted answers rise to the top of a question's thread, while heavily downvoted answers are collapsed or hidden.
• Stack Exchange / Stack Overflow : A network of expert Q&A communities where users can upvote and downvote both questions and answers. Voting impacts user reputation points.
• Hacker News : A tech-focused news aggregation and discussion site where users can upvote submissions and comments. Downvoting is also available, though it often requires a minimum amount of user karma/reputation to unlock.
• Lemmy : A decentralized, open-source federation alternative to Reddit where communities host their own interconnected servers while retaining a traditional upvote and downvote architecture.
• Product Hunt : A platform for discovering new tech products where users upvote their favorite daily launches (though it relies purely on upvotes rather than downvotes).

Are you looking for a platform with an upvote/downvote system for casual social discussion , a knowledge-sharing Q&A community , or do you need to build one yourself?

Many websites use community voting to rank content, highlight quality contributions, or gather feedback. Here are some of the best-known examples:

Some websites use only positive voting (or have limited downvoting):

• Hacker News — everyone can upvote, while downvoting is limited to certain trusted users.
• Product Hunt — upvotes only for product launches.
• Quora — primarily upvotes for answers; its voting model differs from Reddit-style public downvoting.
• YouTube — videos have Like and Dislike buttons, but comment voting is likes only and public dislike counts are hidden.

There are also specialized feedback platforms that let users vote on feature requests rather than social posts, such as Feevox, where users can both upvote and downvote ideas to help prioritize product roadmaps.

If you're looking for websites with a Reddit-style system where all users can both upvote and downvote content, the most prominent examples are:

• Reddit
• Stack Overflow / Stack Exchange
• Lemmy
• Slashdot