YES! Gimbl is free-to-use. We do not charge any monthly fees. If you decide to start receiving challenges, Gimbl charges a commission fee of 18% only on successfully achieved challenges. For every challenge that is not achieved by a streamer, users/donators are fully refunded.
If you receive a donation through Gimbl, the only commission taken is to cover our payment service provider cost. You can find the costs explained in our Terms & Conditions.