AssemblyAI vs Speechify
AssemblyAI and Speechify both appear in this directory's audio listings. Prices below were read from the vendors' own pages, most recently on September 14, 2026. AssemblyAI starts at $0.02 usage-based and Speechify at $29/mo, billed over different periods, so neither is ranked cheaper here. We track transcription on AssemblyAI and text to speech on Speechify; both cover speech to text. No score and no winner: the facts do the picking.
AssemblyAI
Voice AI infrastructure for builders
AssemblyAI delivers production-ready Voice AI models, including pre-recorded and real-time streaming speech-to-text, speaker diarization, and voice agent APIs. It provides advanced models like Universal-3.5 Pro, supporting multiple languages and specialized medical transcription modes.
Speechify
Cloud-based text to speech platform with lifelike AI voices
Speechify is a cloud-based text to speech platform offering over 1,000 lifelike AI voices in 60+ languages across web, mobile apps, and browser extensions.
At a glance
Capability tags are factual labels we assign when a tool is added; they describe what a tool does, not how well it does it.
Checked against the vendors. Written from each vendor's own site and last re-checked there: AssemblyAI (under review since September 14, 2026) · Speechify on September 14, 2026. Vendors change pricing and features without notice, so confirm anything that decides your purchase on the vendor's page.
Also in audio
A tool we have an affiliate relationship with. It is not part of the comparison above and we are not calling it the better pick.
- Repurposing podcast and video recordings into social posts, newsletters, and blogs
- Content teams and agencies managing multi-brand client media pipelines
- Transcribing and summarizing meetings, webinars, and sales calls
Key features
AssemblyAI
- Pre-recorded and real-time streaming speech-to-text transcription
- Speaker diarization to segment utterances by speaker
- LLM-powered Speech Understanding and LLM Gateway
- Custom keyterms prompting and Medical Mode for specialized terminology
Speechify
- Over 1,000 lifelike AI voices in 60+ languages
- Text highlighting and speed controls up to 5x
- Voice typing dictation across applications
- AI voice cloning, avatars, dubbing, and voice changer
What each one does well
AssemblyAI
- ✓ Building real-time voice agents
- ✓ Transcribing pre-recorded audio files with high accuracy
- ✓ Performing call analytics and medical transcription
Speechify
- ✓ Listening to documents and books on the go
- ✓ Generating realistic voiceovers and AI podcasts
- ✓ Writing documents and emails using voice dictation
People also ask
Which is cheaper, AssemblyAI or Speechify?
AssemblyAI starts at $0.02 usage-based and Speechify starts at $29/mo. The two are billed over different periods, so we do not rank them on price.
Does AssemblyAI or Speechify have a free plan?
Both. AssemblyAI and Speechify each publish a free plan.
What is the difference between AssemblyAI and Speechify?
Both are tracked for speech-to-text. Of the capabilities they do not share, only AssemblyAI is tracked for transcription, speaker-identification, developer-api, and only Speechify is tracked for text-to-speech, voice-cloning, dubbing, avatar-video, summarization.
How much do AssemblyAI and Speechify cost?
AssemblyAI: free plan, then $0.02 usage-based. Speechify: free plan, then $29/mo.
Answers are generated from the tracked plans and capability tags shown above, so they move when the vendors' pages do.
Full fact sheets, FAQs, and discussion links: AssemblyAI · Speechify · all audio tools