Closed-alpha test for web-calculator has ended.
Now, everyone can use it, without registration and ads:
http://fonlinew.xyz/?char
Offline version.
Калькулятор практически полностью копирует интерфейс игры. В финальной версии пришлось изменить шрифт похожий на тот что в игре из за его не читабельности.
Calculator practically copies game interface. During final dev stage text font was changed, due to bad game one readability.

Spoiler

On the right side you can see perks list before softcap (level 28), which you can take, limited by your special stats.
Name and password is not a must-have. Name will be shown on resulting page, and password is not sent anywhere.
After creating character pressing DONE, you can start leveling it.
If you didn't take perk on a level as soon as it appeared, you can press BONUSES for perk window to appear again.

Spoiler
QUESTS page will allow you to add quests to your hypothetical build.
I'll answer any questions about functionality.

Don't throw much shit on the fan, I'm only learning).
Don't forget to track bugs and unfinished stuff, and I'll try to fix them in shortest terms.
Also I'm up to new ideas and propositions.

Wanna say my thanks for everyone who supported me, motivated me and helped with testing calculator:
VaultTec, Fleyshman, Panzer and kven.