First up is Proposalsgenerator. This extension is geared for Upwork freelancers, using AI to create custom proposals in 30 seconds or less. It's geared for speed, quality and volume, so it's good for freelancers who need to churn out lots of proposals. The extension also offers a free trial so you can see if it's worth your while.
Another good option is Proposal Genie. This SaaS tool uses AI to create custom proposals for freelancers on Upwork and Freelancer.com. You fill in your profile and job requirements, and it creates a well-written proposal tailored to the job. It's customizable, has a centralized dashboard and offers expert feedback to make the proposal process easier. It's geared for freelancers who want to use it for a lot of proposals.
If you're looking for something that'll help you with a wider job hunt, JobBuddy could be helpful. It's geared for creating custom cover letters and resumes, but its AI abilities can match your documents to specific job descriptions for better visibility and interviews. JobBuddy is relatively cheap, with free and paid options, so you can use it at a level that suits your needs.