Pull Panda is described as 'Dev teams at 1,000+ companies like Pivotal, Instacart, and WeWork use Pull Panda to ship faster on GitHub' and is an app. There are four alternatives to Pull Panda for SaaS, Mac, Web-based, Self-Hosted and Slack. The best Pull Panda alternative is Swarmia, which is free. Other great apps like Pull Panda are Unblockd, PullPro and Code Dog for Slack.
Swarmia is an engineering productivity software trusted by 600+ engineering teams worldwide. Use key engineering metrics to unblock the flow, align engineering with business objectives, and drive continuous improvement.
Unblockd is a native macOS menu bar app that gives you a unified view of Pull Requests across Bitbucket Cloud, GitHub, and GitLab.com — without notification spam.
PullPro is a Slack app that helps your team stay on top of pull request reviews. It notifies your channel once a pull request is ready for review, sends reminders for reviews still waiting, and has configurable reports to help keep your team on track with your goals.
Receive daily Slack reminders about your unmerged Pull Requests. Supports GitLab and BitBucket.
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I like Swarmia as an alternative to Pull Panda because with Swarmia I can read and reply to PR comments and change requests directly in Slack which is useful especially on mobile and when addressing smaller comments.