Kooxda horumarinta dabo waxay ka shaqeyneysaa sii deynta weyn ee tan xigta ee qeybinta taas oo dad badanna ay ugu yeeraan Anonymous OS.
Dabo 4.0 ayaa gashay beta dhowaan waana sii deyntii ugu horreysay nidaamka Debian 10 Buster., taas oo macnaheedu yahay in dhammaan ama inta badan xirmooyinka horay loo rakibay loo cusbooneysiiyay noocyadii ugu dambeeyay si loo taageero qaybaha cusub ee qalabka, gaar ahaan kaararka sawirada ee ka socda AMD iyo Nvidia, iyo sidoo kale kombuyuutarrada Mac.
Dabo 4.0 sidoo kale waxay leedahay taageerada qalabka Thunderbolt 3, kaas oo hadda lagu dhex daray qaybtii ugu dambaysay ee GNOME 3, jawi garaaf ah oo si caadi ah ugu imaan doona Tails. Waxaa lagugula talinayaa dadka isticmaala aaladda Thunderbolt inay tijaabiyaan hirgelinta iyaga oo maraya aaladaha> Thunderbolt oo ka mid ah goobaha GNOME.
Dhinaca kale, Tails 4.0 isticmaaleyaashu waxay awoodi doonaan inay ka furtaan mugyo joogto ah USB kale oo leh Dabo, ku dar arjiga maareynaya faylalka kuwa ugu cadcad, tusaya tufaaxa 'OpenPGP applet' ee dhinaca bidix ee xaaladda TOR, beddel warqadda galitaanka shaashadda, oo isticmaal astaamaha calaamadda ee biraawsarka Tor.
Codsiyo badan oo si dabiici ah ugu yimid dabada ayaa laga saari doonaa dabo 4.0. Kuwaas waxaa ka mid ah arjiga daabacaadda 'Scribus' iyo xisaabta qaybta LibreOffice suite, oo lagu rakibi karo qaybta Software-ka Dheeraadka ah. Intaa waxaa sii dheer, qalabka maareynta sirta ee KeePassX waxaa lagu beddeli doonaa KeePassXC.
Sidoo kale waxaa laga saaray Tails 4.0 'Home launcher' oo laga soo qaaday desktop-ka iyo akoonnada 'Pidgin' ee caadiga ah. Laga yaabaa in aad soo dejiso Dabo 4.0 bogga rasmiga ah, laakiin laguma talinayo adeegsiga ganacsiga. Sii-deynta ugu dambeysa waxay timaaddaa Oktoobar 22, 2019.