Fadel Abdulghany from the Syrian Network for Human Rights said they had documented at least 207 people killed, including six women, six children and two medics.
He said the death toll is probably far higher than that, as the number does not include combatants killed in battle, but instead focuses on those who were subjected to summary executions, other violations and those killed in Israeli strikes.
“This not a final death toll, it’s increasing – there are cases we haven’t been able to reach,” Mr Abdulghany told The Independent.
“The core of the problem is everything has been a mess – there is no real political inclusion [since the fall of Assad], it feels like major centralisation.”