There are no such applications available which will help you for UPSC preparation . Even if such applications exist, they won't help you for UPSC preparation . So here I will help you with the links for syllabus for UPSC. You can refer them for preparation. If you can afford higher budget then go for bjyus. Even they train students for UPSC examination

IAS syllabus link

https://competition.careers360.com/articles/upsc-ias-syllabus/amp

IPS syllabus link

https://competition.careers360.com/articles/ips-syllabus/amp