HVAC Test Prep Practice 2025

USE this app for learning millions of topics or hundreds of languages. Our Voice AI helps you become experts in any general knowledge, class materials, college courses – or even professional certificates.
SAY, “Why the name Clementine in the movie Eternal Sunshine?”, then “Explain the meaning of the ending scene.”
SAY, “Tell me the world history in 2001.”. Then, “What were top 3 innovations then?”. And, keep going with “in 2002?”, “in 2002?”.
ALWAYS-ON screen and horizontal display as presentation modes. Use this app along your car like an audio dashboard during commute, or next to your laptop like a sidekick during work. So, mostly screen-free and hands-free!
EASY to use with a single screen with big buttons: Press & Hold,  Tap to Speak, Pause / Play,  Repeat Last,  Surprise ME!,  New Session.
FEEL the slight vibration or hear the continuous low beeps as ChatGPT4 thinks. Haptic feedback is fun! Blinking flash light when your network connection is bad.
SHAKE your phone or press Action Button or swipe up to start a new session. Switch app to pause playback. Try “Surprise ME!” for a random fact from Wikipedia or a riddle from ChatGPT4.
Download and select “Settings → Accessibility → Spoken Content → Voices → English → Ava → Ava (Premium)” instead of the default “Samatha”. Or, Long Press “Repeat Last” for shortcut.
Adjust “Spoken Content → Speaking Rate”. Or, Long Press “Skip 5 Seconds” to cycle between 1x, 1.5x, and 2x speeds.
See our open-source code on Github. Support all existing iOS devices including iOS 15+ (iPhone 13 to 15 or iPad 9 to 10). We use Apple’s Speech Framework for on-device recognition and synthesis. We use OpenAI’s ChatGPT4 streaming API with 8K and 32K token contexts for low perceived latency of less than 2 seconds.
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