Hippo is described as 'Make notes, keep track of events and store to-dos for all your contacts' and is an app in the Office & Productivity category. There are more than 10 alternatives to Hippo for a variety of platforms, including Online / Web-based, iPhone, Android, iPad and SaaS. The best alternative is Google Contacts, which is free. Other great apps like Hippo are EteSync (Paid, Open Source), Contacts+ (Freemium), Monica (Freemium, Open Source) and Cloze (Paid).
Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
Cloze - Relationship Management, Inbox, and Contacts in One App Cloze is like a personal assistant for your professional relationships that is always prompting you at the right moment and remembering what you don’t.
Dex is a personal CRM designed to be much easier than a sales CRM. Dex reminds you to keep in touch with the people you care about. Easily visualize, understand, and manage all your relationships for free.
Zoho ContactManager helps you manage contacts, deals & tasks all from one place. Features: Access to Feeds, Contacts, Companies, Deals and Tasks in Contact Manager. View, Create, Edit and Delete records in all supported modules.