Does ASF is safe?

VAC is usually done when you use cheats/injectors during online games. from the support page:

VAC stands for Valve Anti-Cheat, an automated system designed to detect cheats installed on users' computers. If a user connects to a VAC-Secured server from a computer with identifiable cheats installed, the VAC system will ban the user from playing that game on VAC-Secured servers in the future.

ASF and IdleMaster only runs the game, doesn't do anything else (think it stays on start page) so these apps won't trigger nothing related to a VAC ban for itself.

EDIT: also consider that only a bunch of games are protected by VAC.

Q: Can I get VAC ban for using this?
A: No, it's not possible because ASF (unlike Idle Master or SAM) does not interfere in any way with steam client nor it's processes. It's physically impossible to get VAC ban for using ASF, even during playing on secured servers while ASF is running - this is because ASF doesn't even require Steam Client being installed at all in order to work properly. ASF is the only farming program that can currently guarantee being VAC-free.

Q: Is it safe?
A: If you ask if ASF is safe as a software, which means that it won't cause any damage to your computer, won't steal your private data, install viruses or any other stuff like that - it is safe. Code is open-source, and distributed binaries are always compiled from publicly available sources. If you for whatever reason don't trust them, you can always compile and use ASF from source, including all libraries that ASF is using (such as SteamKit2), which are open-source too. In the end however, it's always a matter of trust to the developer(s) of your application, so you should decide yourself if you consider ASF safe or not, potentially supporting your decision with technical arguments.

Q: Can I get banned for this?
A: We should take a closer look at Steam ToS. Steam doesn't prohibit using of multiple accounts, in fact, it allows it implying that you can use same mobile authenticator on more than one account. What it however doesn't allow is sharing accounts with other people, but we're not doing that here.

From the FAQ section of the wiki: https://github.com/JustArchi/ArchiSteamFarm/wiki

Both are safe

Windows Defender once detected a trojan within ASF, though.

It turned me into a newt.

Is safe, maybe defenders can detect asf as trojan or virus but thats like too many safe things, i used asf once and had not any problem, anyway now i use idle master since weeks withouth any problem too

So , safe for me .

Safe for 101%

Archi is collecting all user data to prepare great Steam Apocalypse :3

seriously tho, it's safer then safe, the Windows Defender thing was an one time thing, Archi then submitted the code to Windows and they approved it, so there's that

No its not safe ofc .

Its Hax , Archi is collecting the steam accounts of everyone here and eventually is going to steal all accounts and make his empire of Card idling zombies from them !