If you want to listen to research papers while on the go without having to read them, Audemic Scholar is a top contender. The service converts ordinary research PDFs into an interactive listening format so you can listen to full papers or just quotes. It's got natural voices, translation to other languages and accessibility features like the ability to speed up playback and support for dyslexic font styles. Audemic Scholar also has a highlighter and note-taking feature, so it's a good option for Ph.D. students and researchers. The service has a free plan with some limits and a premium plan costing $9.99 per month or $118 per year that gets you unlimited highlights and full reader access.
Another top contender is Audioread, an AI-based text-to-speech conversion service. It lets you convert documents like PDFs, emails and articles into an audio format so you can listen while you do other things. Audioread supports ultra-realistic voices on multiple platforms, including a web app and mobile apps, and generates a private podcast RSS feed so you can subscribe. It's geared for productivity and multitasking, and you can subscribe for $9.99 per month for up to 500,000 words per day.
Last, Peech is a simple text-to-speech reader that supports more than 50 languages and several input formats, including web pages and PDFs. It's customizable and has AI-powered voice selection, so it's good for people with vision impairments or reading difficulties. Peech is available as a Chrome extension and on iOS, with an Android app on the way, and offers high-quality audio and a convenient user interface.