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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.

The short answer

Entry price
Audio To Text Converter from $4.90 once, Sonix from $25/mo — different billing units, so no direct winner
Free plan
Only Audio To Text Converter (Sonix has paid plans only)
Public API
Sonix has one; not confirmed by us for Audio To Text Converter
Higher Trust score
Sonix — 94 vs 62 for Audio To Text Converter
Best fit
Audio To Text Converter: One-off batches of interviews or lectures · Sonix: Journalists and researchers cleaning up long interview recordings

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

Side by side

FactAudio To Text ConverterSonix
CategorySpeech-to-Text & TranscriptionSpeech-to-Text & Transcription
Pricing modelFreemiumPaid
Starts at$4.90 once$25/mo
Public APINot confirmedYes
Trust score62 / 10094 / 100
PlatformsWebWeb, API
Company—Sonix, Inc.
Launched—2017
Last verifiedOct 16, 2026Oct 15, 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

Audio To Text Converter vs Sonix: the questions people ask

Is Audio To Text Converter cheaper than Sonix?

They charge in different units, so there is no like-for-like answer: Audio To Text Converter starts at $4.90 once, Sonix at $25/mo. Entry price is the lowest paid plan as we last verified it.

Does Audio To Text Converter or Sonix have a free tier?

Audio To Text Converter has a free tier; Sonix has paid plans only.

Which has a public API, Audio To Text Converter or Sonix?

Sonix ships a public API, as of our last verification. A public API for Audio To Text Converter is not confirmed by us — check its developer docs before you plan an integration.

Browse all Speech-to-Text & Transcription →