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Whisper API

Name: Whisper API
Author: Challenging Voice

Speech-to-text on Whisper Large V3 with speaker detection across 100+ languages – OpenAI-compatible API, 30 free hours, then $0.17/hour.

3.3 Audio

3.3 Good 3.3

Bottom line: Speech-to-text on Whisper Large V3 with speaker detection across 100+ languages – OpenAI-compatible API, 30 free hours, then $0.17/hour.

Named, current underlying model rather than a vague "AI-powered" claim Developer-oriented API access requires some technical setup for full use

Reviewed by Challenging Voice Editorial · Updated Sep 2026 How we rate

PricingFree Trial

Free planNo

CompanyWhisper API (Lemonfox.ai)

PlatformsAPI, Web

Best forAudio

Visits6

Last reviewedAug 2026

UpdatedSep 2026

Ask AI about Whisper API ChatGPT Claude Perplexity

Overview

Whisper API, powered by Lemonfox.ai, is a speech-to-text transcription service converting audio content into written text using Whisper Large V3 – described as the latest and most precise speech recognition AI model available.

Speaker detection identifies and labels multiple speakers within a single audio file, language support spans over 100 languages with English translation capabilities, and the service processes audio from podcasts, videos, and meetings across a range of formats. An OpenAI-compatible API means existing integrations built for OpenAI’s own transcription endpoints can switch over with minimal changes, and a free Transcripo tool covers manual transcription for non-technical users.

Whisper API targets developers building applications that need transcription functionality, alongside non-technical users via the companion Transcripo tool. Free trial: 30 hours of transcription in the first month. Pay-as-you-go: $0.17 per hour after the trial period.

Key features

Built on Whisper Large V3, a current top-tier speech recognition model
Multi-speaker detection and labeling
100+ language support with English translation
OpenAI-compatible API for easy integration
Free Transcripo tool for non-technical manual transcription

Screenshots & demo

Pricing

Visit the Whisper API website for current plans and pricing.

Pricing modelFree Trial
Starting priceCustom
Free planNo

Visit Whisper API

Pricing is provided as a guide. Check the official site for the latest plans.

Pros & cons

Pros

Named, current underlying model rather than a vague "AI-powered" claim
Genuinely low pay-as-you-go pricing ($0.17/hour) after a generous 30-hour trial
OpenAI-compatible API lowers switching costs for existing integrations

Cons

Developer-oriented API access requires some technical setup for full use
Pay-as-you-go costs scale directly with transcription volume
Speaker detection and translation accuracy still varies with audio quality

How it compares

Tool	Rating	Free	From	Best known for
Whisper API (this tool)	3.3	No	—	Built on Whisper Large V3, a current top-tier speech recognition model
Sonix	4.4	No	$10/mo	Text-based transcript editing
Transkrip	3.2	No	$1.3/mo	90%+ accuracy for Indonesian, plus 25+ other languages
Transkriptor	4.0	No	$9.99/mo	AI transcription across 100+ languages with speaker identification

Alternatives to Whisper API

4 tools matched to Whisper API on what they do, their category and their price.

Sonix

4.4

Transcript-editing built specifically for video subtitling

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Transkrip

3.2

Over 90% accuracy on Indonesian audio, an hour of content transcribed in under a minute – pay per file (about $1.30), used by Google, Gojek, ByteDance, and Kyoto University.

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