What free audio transcription service works best for noisy audio?

We tested some free transcription services with a MP4 video with large amounts of background noise and a very badly recorded voice from a camera microphone.

We tested:

• sonix.ai
• temi
• freetranscriptions.com
• veed.io
• amberscript.com

The best result was from amberscript.com which was much much better than the next best result from temi.

Further notes:

• We did not find out how to export the entire subtitle file from veed.io
• temi provides an interface where words that have not been recognized clearly are marked. This helps enormously when manually correcting transcriptions.
• freetranscriptions takes audio files as input, not video files
• amberscript took the longest of all tools to transcribe.