WhisperDirect is a high-accuracy speech-to-text and summarization app that works with your own API key.

No subscription required — you only pay OpenAI’s usage fees when you need it, making it more cost-effective than subscription-based apps.

Pricing & Trial

• Free trial: 5 sessions included

• After the trial: one-time in-app purchase unlocks unlimited use of current features

• API usage billed directly by OpenAI (the app does not charge for API usage)

Cost Guide

• With $5, you can transcribe about 14 hours of audio

• Whisper API ≈ $0.006 per minute (≈ $0.36 per hour)

• OpenAI API pricing → https://openai.com/ja-JP/api/pricing/

Models for summaries and meeting minutes

Choose from compact, low-cost models:

• GPT-4.1-nano

• GPT-4.1-mini

• GPT-5-nano

• GPT-5-mini

Even long texts (1,000–2,000 words) can usually be processed for just a few cents per run.

Main Features

• Record with the microphone button and instantly convert to text

• Import audio files (or directly from the share sheet)

• Import video files (audio extracted and compressed automatically)

• Playback-synced highlighting of transcript segments

• Insert timeline markers (configurable in 5-second steps)

• Generate summaries and meeting minutes (prompts editable in Settings)

• Export audio, text, summaries, minutes, or subtitles (VTT / SRT)

• Automatically post transcripts/summaries/minutes to Slack

• Estimate costs in Settings (based on audio length and character count)

• Other customization options (LLM model, timeline interval, prompts, etc.)

Supported formats

Audio: mp3, m4a, aac, wav, flac, ogg, opus, wma, amr, mpga, webm, aiff, caf

Video: mp4, mov, m4v, webm, mkv, avi, mpeg, mpg

Notes

• An API key (such as OpenAI) is required

• Pricing and available models may change according to OpenAI’s offerings