OpenFlow
Speech to text accuracy test
Read a short passage out loud. We compare what you said with what the machine heard, then score it word by word.
Click the mic, then read the passage out loud at a natural pace.
You just tested your browser's speech engine, which usually transcribes in the cloud. On-device models have caught up: OpenFlow runs NVIDIA's Parakeet locally and is known for nailing technical vocabulary. Try the technical passage above, see what your browser missed, then read how OpenFlow handles it.
Questions people ask
How accurate is speech to text in 2026?
Modern engines reach roughly 95 to 98 percent accuracy on clear speech in a quiet room. The remaining errors cluster in predictable places: technical vocabulary, proper names, numbers, strong accents, and background noise. Everyday conversational text is close to solved. Specialist vocabulary is not.
What is word error rate (WER)?
Word error rate is the standard accuracy measure for speech recognition. It adds up substitutions, insertions, and deletions, then divides by the number of words in the reference text. A WER of 5 percent means 95 percent accuracy. This tool computes it by aligning what you read against what the engine heard.
Why does dictation get technical words wrong?
Speech models predict likely words, and rare technical terms are unlikely by definition, so the engine substitutes a common word that sounds similar. Apps with a custom dictionary solve this: OpenFlow lets you map what you say to the exact spelling you want, so kubectl comes out as kubectl every time.
Does the microphone affect dictation accuracy?
Quite a lot. A quiet room and a decent mic near your mouth can move accuracy several points. Bluetooth headsets often run at a lower sample rate than a built-in mic, which can make them worse for dictation despite feeling more convenient.
Accuracy is one thing. Getting the words into your app is another.
OpenFlow transcribes on your Mac with NVIDIA's Parakeet model, drops the text straight at your cursor in any app, and lets you teach it the exact spelling of your jargon. Free and open source.
Apple Silicon, macOS 14 or later. Nothing is uploaded, ever.