Best Sonix Alternative

Looking for a Sonix alternative? STT.ai offers superior accuracy, more models, and transparent pricing.

How it works →
Client-side encryption on — your transcript will be encrypted in your browser before being stored. The server processes your audio for transcription, then the result is encrypted locally with your key before saving. (All data is always encrypted via HTTPS in transit.)
Speed varies by platform. Some transcripts are ready in seconds, others may take a few minutes depending on video length.
Drop file here or click to browse
MP3, WAV, M4A, FLAC, MP4, MKV, MOV, WebM — up to 2GB
Recording: 0:00
Real-time Vosk (instant)
Enhanced Whisper (accurate)
Public links: 24h, text only · Sign up for 7d + audio · Pro for private links

Real-time speech to text. AI auto-corrects as you speak — accuracy improves with longer speech.

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Sign up for free to get 600 minutes/month, or upgrade for unlimited transcriptions.

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10 free min/day 600 min free with signup No credit card Encrypted
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Feature STT.ai Sonix
Languages Supported100+Limited
AI Models15+1
Choose Your Model✓✗
Speaker Diarization✓Limited
API Access✓Paid
Export FormatsTXT, SRT, VTT, JSONTXT, SRT
Free Tier600 min/moLimited
Starting Price$8.33/mo-
Client-Side Encrypted Storage✓ AES-256-GCM✗
Real-Time Streaming✓ WebSocket✗
AI Summarization✓ On-device LLM✗
Open-Source Models✓✗

Why Switch to STT.ai

More Model Choices
Pick from 15+ leading AI models to optimize for your use case.
100+ Languages
Broadest language support with automatic detection.
Transparent Pricing
Generous free tier and simple, predictable pricing.
Developer-Friendly API
RESTful API with SDKs, webhooks, and batch processing.

Pricing: STT.ai vs Sonix

STT.ai
$0 / month to start
  • ✓ 600 free minutes per month
  • ✓ No signup or credit card required
  • ✓ All 10+ AI models included
  • ✓ Speaker diarization included free
  • ✓ All export formats (TXT, SRT, VTT, DOCX, JSON, PDF)
  • ✓ API access on paid plans from $8.33/mo
  • ✓ 100+ languages
Sonix
$$$ / month
  • - Limited or no free tier
  • - Signup required
  • - 1 model
  • - Limited or paid add-on
  • - Limited export formats
  • - API may cost extra
  • - Limited languages

Switching from Sonix?

You do not need to change your workflow. STT.ai accepts the same audio and video formats, supports the same languages, and exports to the same file types. Upload your first file and see the difference in accuracy -- it takes under 60 seconds.

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No credit card. No signup. 600 free minutes per month.

Switch to STT.ai Today

Start with our free tier and experience the difference. No credit card required.

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Frequently Asked Questions

Upload your audio or video file to STT.ai. Select your preferred AI model and options, then click Transcribe. Your transcript will be ready in minutes. Export as TXT, SRT, VTT, DOCX, JSON, or PDF.

Yes! STT.ai offers 600 free minutes per month for all users. No signup required for your first transcription. Paid plans with more minutes and features start at $5/month.

Accuracy depends on the AI model you choose and audio quality. Our best models achieve a 5-7% Word Error Rate on benchmarks, meaning 93-95%+ accuracy. Clear audio with minimal background noise produces the best results.

STT.ai offers 10+ models including Whisper Large V3, NVIDIA Canary, and more. You can compare results from different models on the same file.

Yes. After transcribing, export your transcript as SRT or VTT subtitle files. These work with YouTube, Vimeo, and all major video platforms.

Yes. STT.ai automatically identifies and labels different speakers using AI speaker diarization. Works across all models and languages.

Most files are transcribed in under 5 minutes. A 1-hour audio file typically takes 2-3 minutes with our fastest models.

STT.ai supports 20+ audio and video formats including MP3, WAV, M4A, FLAC, OGG, MP4, MKV, MOV, WebM, and AVI. Export as TXT, SRT, VTT, DOCX, JSON, or PDF.

Yes. Audio files are processed and deleted after transcription. Your data is never used for training. Client-side encryption is free on all plans — it encrypts stored transcripts with a key only you have. During processing, the server handles your audio in plaintext. Learn about our security.

Yes. STT.ai offers a REST API with Python and Node.js SDKs. Free tier includes 100 minutes/month.

Yes. STT.ai includes a built-in transcript editor where you can correct errors, rename speakers, and adjust timestamps.

Every transcript gets a unique shareable link. Export to DOCX or PDF for email. Pro plans offer password-protected and permanent links.