One of the top tools is Hoppy Copy, a feature-rich tool geared for marketers. It's got more than 50 email templates, image-rich newsletters, multi-day drip email campaigns and content conversion. It works with more than 35 languages, lets you track competitors' email campaigns, manage multiple brands and create custom audiences. It comes with a 7-day free trial, and you can request a refund within 30 days.
Another good option is Daily, an AI-powered email newsletter generator that's designed to help businesses keep their audience engaged without much work. Daily offers content curation, adaptive learning to personalize content based on subscriber behavior, and branded voice synthesis. It also has human oversight to keep the AI from getting too crazy, and customizable content strategy options. It's available on a variety of pricing plans, so it should fit your business needs.
If you want a more general-purpose tool, check out ChatGPT Writer. It's got a lot of features, including grammar checking, rewriting, tone shifting, translation and summarization, in a lightweight browser extension and web app. It works with all languages and integrates with Gmail for more advanced email writing help. It's available on a variety of pricing plans, including a free tier, so it should fit your budget.