InstaLogin 1.3 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. InstaLogin for Mac lies within Security Tools, more precisely Personal Security.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This free Mac app is a product of Pedro José Pereira Vieito.
From the developer:
InstaLogin is a Safari app extension that allows you to automatically login in into websites with Safari AutoFill. You may use AutoFill or type your user and password in a login page. Then, you can click the Bolt button in the Safari toolbar so that InstaLogin can auto-login you in into that site every time it detects that your credentials are filled by AutoFill in the log-in form.
You may want to check out more Mac applications, such as Key Holder or PasswordVault Lite, which might be similar to InstaLogin.