Letterly vs Deepgram: Features, Pricing and User Reviews 2026

Letterly is a voice dictation and note taking app that turns your spoken words into clean, polished text. Instead of typing, you simply talk, and the AI removes filler words, fixes grammar, and organizes your thoughts into paragraphs, bullet points, or headings.

It works well for quick notes, meeting transcripts with multiple speakers, or dictating directly into apps like Gmail, Slack, and Notion. The app supports over 90 languages and works across web, iOS, Android, macOS, and Windows, keeping everything synced across your devices.

You can also connect Letterly to AI assistants and coding tools through MCP, or automate note sharing with Zapier, making it a solid pick for anyone who thinks faster than they type.

Deepgram is a comprehensive voice AI platform that provides three main services through easy-to-use APIs. First, it offers Speech-to-Text that converts spoken words into written text with over 90% accuracy, even in noisy environments or with heavy accents. Second, it provides Text-to-Speech that creates natural-sounding voices for apps and voice assistants. Third, it offers Voice Agent APIs that let developers build complete conversational AI systems.

Founded in 2015 and based in San Francisco, Deepgram has become the go-to choice for companies like Spotify, NASA, and Citibank. The platform uses deep learning models specifically trained for real-world audio, not just clean studio recordings. This means it works well for call centers, medical transcription, podcast processing, and live streaming. With response times under 300 milliseconds, it enables real-time conversations that feel natural and immediate.