CoachLingo (https://www.coachlingo.ai/) lets you practice 30 languages or variations (e.g. US, UK or Australian English) orally and in writing via an AI avatar.

The user chooses a language and a scenario (avatar role, type of professional situation, games, preparation for a certification, daily situation, etc.) and then converses/writes live.
Language change possible at any time.
Every interaction is corrected and encouraged.

Progress tracking provided.

Free for basic text and voice practice with unspecified session quotas.