The best alternatives to SpeechComplete are Algolia, Spext, and Serenade. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Serenade is the fastest way to write code with natural speech. Rather than memorizing keyboard shortcuts and language syntax, Serenade enables you to write code with commands like "create function" and "delete argument".
Voice In is a chrome extension that lets you dictate directly into many websites. Voice In uses the power of speech-to-text to let you type emails in Gmail or send messages in Slack or respond to customer requests in Zendesk or write a blog post on Wordpress.
Recordfy is the easiest way to send audio messages directly on Slack. Simply use /record slash command to start recording your audio. No external integration needed! When you're finished, your audio is uploaded to your Slack channel or direct message as an attachment.