lisaC says:
The purchase of individual apps (like Chinese Writer, Audio Trainer, Pinyin Trainer, etc.) is done within the app store and we do not have a reference of it as we only get aggregated values and can not trace on which trainchinese user did make the purchase.
For that reason unfortunately such purchases can not be counted when buying a trainchinese subscription.
On the other hand users who buy a trainchinese subscription do have access to all apps without restrictions for both iOS or Android devices.