What are some alternatives?
When comparing Noise Blocker and Krisp, you can also consider the following products
NoiseGator - A simple noise gate app intended for use with VOIPs like Skype.
Zeplin - Collaboration app for UI designers & frontend developers
SoliCall Pro - Removes noise & echo from any VoIP call. Can also be used for call recording.
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
NoiseTorch - NoiseTorch is an open source app for Linux with PulseAudio. It creates a virtual microphone that suppresses noise. Use any conferencing or VOIP app you like and simply select the NoiseTorch Virtual Microphone as input to remove unwanted noise.
Abstract - A secure, version-controlled hub for your design files