If you're looking for a way to generate release notes that look professional even if you're not a great writer, Released is a great option. It uses AI copywriting to generate release notes automatically, so product teams can concentrate on the meat of what's new and release notes will look good. Released integrates with Jira, Confluence and Slack and offers free and paid versions depending on team size and needs.
Another contender is Release AI, which is geared specifically for tracking API changes and generating release notes. It can generate release notes in HTML, Email and PDF formats, and can send updates to Slack, S3 and Dropbox. It also offers flexible release cycles and multiple integrations, so it's well-suited for API-first companies that need to document their products as fast as they can and in as consistent a way as possible.
If speed and data privacy are a priority, BixGPT generates release notes with AI but uses private AI models that are tuned for performance and data protection. It can generate release notes in multiple formats, and offers features like one-click generation, custom styling and client notifications. BixGPT offers several tiers of pricing, including a free plan, so it should be useful for a wide range of users.