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Audio To Text Converter vs Sonix

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Audio To Text Converter starts at $4.90, Sonix at $25. Only Audio To Text Converter has a free tier. Only Sonix ships a public API.

Audio To Text ConverterBrowser transcription for 15 audio formats with speaker labels and SRT/VTT export, sold as prepaid minute packs.SonixTranscription, translation and subtitles with a browser editor

Side by side

FactAudio To Text ConverterSonix
CategorySpeech-to-Text & TranscriptionSpeech-to-Text & Transcription
Pricing modelFreemiumPaid
Starts at$4.90 one_time$25 month
Public APINoYes
PlatformsWebWeb, API
Company—Sonix, Inc.
Launched—2017
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

Audio To Text Converter

Honest prepaid transcription with no subscription trap - useful if you have a stack of recordings once a quarter rather than a weekly meeting habit. The 90-day expiry on packs is the real cost, and the total absence of any named operator makes it a poor fit for anything confidential.

Pros

  • Fifteen input audio formats accepted, including OPUS, AMR and WMA
  • Six export formats including SRT, VTT and CSV, not just plain text
  • Paid packs add speaker identification, AI translation and bulk uploads
  • Free tier of 30 minutes needs no purchase to evaluate quality

Cons

  • Credits expire after 90 days, so unused minutes are simply lost
  • No named company, registered address or country anywhere on the site
  • Free tier is throttled to three files a day on a lower-quality model
  • No API, so nothing here can be automated

Sonix

Pick Sonix when the transcript is a working document you will correct, subtitle and hand off — the editor is the product, not the ASR. If you mainly want live meeting notes, Otter is cheaper and better suited; if the recording is legally critical, Rev's human tier is the safer route.

Pros

  • The word-locked editor makes correcting a long transcript far faster than re-typing
  • 50+ languages for both transcription and translation, priced at the same hourly rate
  • REST API with batch processing and custom vocabulary is included with subscriptions
  • SOC 2 Type II, HIPAA posture and a stated no-training policy on customer files

Cons

  • Per-seat pricing at $25/mo each punishes small teams sharing one library
  • Hour allowances are the real constraint; Core's 5 hrs/mo goes fast on video
  • The 99% accuracy claim is vendor marketing — independent tests put it near peers, around the mid-90s
  • No free plan, only a 30-minute trial

Which one fits

Choose Audio To Text Converter if you need

  • One-off batches of interviews or lectures
  • People who refuse monthly subscriptions for occasional work
  • Subtitle files where SRT or VTT export is the whole job

Choose Sonix if you need

  • Journalists and researchers cleaning up long interview recordings
  • Video teams producing multilingual subtitle tracks from one master file
  • Legal, medical and academic work where custom vocabulary matters
  • Engineering teams batch-transcribing a media archive through the API

More comparisons

Browse all Speech-to-Text & Transcription →