2026 Free AI Transcription Tools Guide: 6 Tools Compared with Real Free Tier Limits
Sources: Official pricing pages, documentation, and hands-on testing. Verified June 2026.
TL;DR
For occasional transcription, OpenAI Whisper (completely free and open-source) is the best choice. For real-time meeting transcription, Otter.ai offers 300 minutes per month on the free tier. For Chinese transcription, Tongyi Tingwu offers 10 hours per day for free.
6 Free AI Transcription Tools at a Glance
| Tool | Free Tier | Languages | Key Feature | Best For |
|---|---|---|---|---|
| OpenAI Whisper | Unlimited (open-source) | 99 languages | Local processing, no limits | Technical users, batch work |
| Otter.ai | 300 min/month | English-focused | Real-time, meeting notes | English meetings, interviews |
| Notta | 120 min/month | 58 languages | Strong CJK, real-time translation | Chinese-English mixed content |
| Tongyi Tingwu | 10 hours/day | ZH, EN, JA, KO | Best Chinese accuracy, subtitles | Chinese language users |
| Feishu Miaoji | 600 min/month | ZH, EN, JA | Feishu ecosystem integration | Feishu team users |
| Whisper.cpp | Unlimited (open-source) | 99 languages | C++ optimized, CPU-only | Low-spec computer users |
OpenAI Whisper — Completely Free, No Limits
Whisper is OpenAI's open-source speech recognition model, trained on 680,000 hours of multilingual data. It offers the highest accuracy among free transcription tools.
Free tier: Completely free, no limits. Open-source model, runs locally.
How to use:
- Python install: pip install openai-whisper — one line of code for transcription
- Command line: whisper audio.mp3 --language en --model large-v3
- Model sizes: tiny (39MB), base (74MB), small (244MB), medium (769MB), large-v3 (1.5GB)
Accuracy benchmarks:
- English: ~97% accuracy with large-v3 (quiet environment)
- Mandarin Chinese: ~95% accuracy with large-v3
- Noisy environments: drops to 85-90%
Limitations: Requires technical knowledge, no GUI (community GUIs exist). First use downloads model files (~3GB for large-v3).
Otter.ai — Best for English Meeting Transcription
Otter.ai is the most popular AI meeting transcription tool, especially strong for English-language meetings.
Free tier:
- 300 minutes of transcription per month
- Max 30 minutes per recording
- Can import 3 audio/video files
- Auto-transcription for Zoom, Google Meet, Microsoft Teams
Paid comparison:
- Pro: $16.99/month — 1,200 minutes, 90 min per recording
- Business: $30/month — 6,000 minutes, unlimited imports
Core strengths: High real-time accuracy, automatic speaker identification, searchable highlights.
Limitations: Weak Chinese support, 300 minutes/month may not be enough for heavy users.
Notta — Chinese-English Bilingual Transcription
Notta specializes in Chinese-English transcription, supporting 58 languages.
Free tier:
- 120 minutes per month
- Max 5 minutes per recording (free tier limit)
- Real-time translation (10 language pairs)
- Audio/video file import supported
Paid comparison:
- Pro: $13.99/month — 1,800 minutes, 90 min per recording
- Business: $27.99/month — 3,600 minutes, team collaboration
Core strengths: High accuracy for Chinese-English mixed content, real-time translation, clean interface.
Limitations: Free tier's 5-minute per-recording limit is very restrictive; practically requires a paid plan.
Tongyi Tingwu — Best for Chinese Users
Tongyi Tingwu is Alibaba's AI transcription tool with the strongest Chinese capabilities.
Free tier:
- 10 hours of transcription per day (~300 hours/month) after registration
- Max 2 hours per file
- Supports Chinese, English, Japanese, Korean, and more
- Video subtitle generation and real-time transcription
Core strengths: Extremely generous free tier, highest Chinese accuracy (~98%), auto-generates meeting summaries and video subtitles.
Limitations: Requires Chinese phone number for registration, inconvenient for international users.
Feishu Miaoji — Best for Team Collaboration
Feishu Miaoji is ByteDance's AI meeting transcription feature within the Feishu (Lark) platform.
Free tier:
- 600 minutes per month
- Supports Chinese, English, Japanese
- Automatic speaker identification
- Auto-generated meeting summaries
Core strengths: Deep Feishu integration, auto-generates transcription and summaries after meetings.
Limitations: Requires using Feishu; not practical for non-Feishu users.
Whisper.cpp — Runs on Any Computer
Whisper.cpp is a C++ optimized version of Whisper that runs on CPU without requiring a GPU.
Free tier: Completely free, open-source, no limits.
How to use:
- Download pre-compiled binary, extract and run
- Supports macOS, Linux, Windows
- CPU inference, no GPU required
Performance:
- base model: ~10x real-time speed (10 min audio in ~1 min)
- small model: ~3x real-time speed
- large-v3 model: ~0.5x real-time speed
How to Choose: Match Your Use Case
Technical users, batch transcription: Whisper or Whisper.cpp — completely free, no limits.
English meetings, interviews: Otter.ai free tier — 300 minutes/month is usually enough.
Chinese-English mixed, need translation: Notta — but free tier is limited, consider Pro ($13.99/month).
Pure Chinese content: Tongyi Tingwu — 10 hours/day free, highest Chinese accuracy.
Feishu team users: Feishu Miaoji — seamless integration, 600 minutes/month.
FAQ
Q: Which free tool has the best Chinese transcription accuracy?
Tongyi Tingwu has the highest Chinese accuracy at ~98% (quiet environment). Whisper large-v3 achieves ~95%. Feishu Miaoji is around 96%.
Q: Whisper vs Otter.ai — which should I choose?
If you have technical skills and need batch transcription, choose Whisper (completely free, no limits). If you need real-time transcription and meeting notes, choose Otter.ai (free tier: 300 min/month).
Q: Can I use free tier output commercially?
Whisper and Whisper.cpp use the MIT license — commercial use is allowed. Otter.ai, Notta, and Tongyi Tingwu free tiers allow personal use; check each platform's terms for commercial use.
Q: What affects transcription accuracy?
Three main factors: 1) Audio quality (more noise = lower accuracy), 2) Speaker clarity (mumbling reduces accuracy), 3) Domain-specific terminology (general models struggle with specialized vocabulary).
Q: Is there a tool that is completely free, unlimited, and requires no registration?
Whisper and Whisper.cpp are completely free, unlimited, and require no registration. Download the model and run it locally with no cloud service dependency.