Privacy policy

Welcome to the CURIOUS WORLD®

The Curious World-branded service is accessible via a mobile or device-oriented app (currently available on Apple TV, iPhone and iPad devices, iOS 8 or above) (individually and collectively, "Curious World"). The Curious World® app and service is owned or licensed and operated and distributed by HMHCo.

The following terms (the “Terms”) provide (a) our “Privacy Policy,” (b) our “Terms of Use,” which governs the opening and use by parents (“you” or “your”) of an account with Houghton Mifflin Harcourt Publishing Company (together with any of its affiliates, “HMHCo” or “we” or “our”), the producer and provider of Curious World, and (c) our “Subscription Terms of Service,” which governs our relationship with parents who, after opening an account with HMHCo, elect to subscribe to the subscription-based version of the Curious World App and service. Please read these Terms carefully.

By downloading and using the Curious World App and/or opening an HMHCo Account, you agree to comply with our Terms of Use and, if you elect to subscribe to the subscription version of Curious World (whether on a free-trial or paid basis), you agree to the Subscription Terms of Service for Curious World. Also, you agree to insure that your child or children will comply with these Terms. We may, at our sole discretion, modify any of these Terms including our Privacy Policy at any time, and your continued use of the Curious World App and services will be deemed acceptance of such modifications.

PLEASE NOTE: IF YOU ARE UNDER AGE 18, PLEASE OBTAIN YOUR PARENT'S OR GUARDIAN'S CONSENT TO OPEN AN HMHCO ACCOUNT AND/OR SUBSCRIBE. If you are at least 18 years of age and you are the parent or legal guardian of one or more children seeking to subscribe to Curious World, you may register an account only for your own children, or children for whom you are a legal guardian. IF YOU ARE UNDER AGE 13, PLEASE HAVE YOUR PARENT OR GUARDIAN COMPLETE ALL ACCOUNT OPENING AND SUBSCRIPTION PROCESSES FOR YOU. WE DO NOT PERMIT PERSONAL OR SUBSCRIPTION INFORMATION TO BE COLLECTED FROM ANY CHILD UNDER 13 YEARS OF AGE.

You may contact us for any reason at the following address:

Houghton Mifflin Harcourt Publishing Company
Attention: Customer Service
222 Berkeley Street
Boston, MA 02116


Telephone: 1-877-271-1680

Please Note: By opening an HMHCo Account on the Curious World website (at or or by subscribing to a subscription level of service on the Curious World App, you are agreeing to receive non-promotional emails about your subscription or use of the service as well as promotional emails about HMHCo offers. You will be given an opportunity to opt-out or unsubscribe in every promotional email you receive or you may email your request to us at Even if you unsubscribe or opt-out of promotional emails, HMHCo may continue to send you non-promotional emails about your account (including regarding your subscriptions, expirations, renewals, payment info, and/or charges) and/or about any service you have signed up for or subscribe to. You can refer to our “Privacy Policy” below.

These Terms were last revised on May 4, 2016.

Privacy Policy

This "Privacy Policy" describes how we collect, use, and disclose information through the Curious World App and the website at or (individually or collectively, the “Curious World Site”). Further, this Privacy Policy must be read in conjunction with our Terms of Use (see below) and, as applicable, the Subscription Terms of Service (see below), and the provisions of both such Terms are incorporated herein. This Privacy Policy does not apply to data we receive from other sources or to other HMH apps or websites (other than the Curious World Site and App) or to any interaction you may have with Apple or its iTunes Store via your iOS device (including from within the Curious World App) or otherwise, or any other app that may be on your device.

The Curious World-branded service is delivered through use of the Curious World App. The Curious World App features games, books and videos for children ages 3-7. There is both free content and content that is gated and accessible based subscribing to one of the available subscription plans and versions of Curious World. (The latter may be offered on a free-trial or discounted promotional or paid basis).

To consume certain books, games and video content and to access certain features of the Curious World service, such as tracking your children’s usage of the Curious World App and enjoying age-appropriate and/or abilities-based recommendations for your children, you will need to register and open an account and pay for the subscription version of Curious World. Children under the age of 13 are not permitted to provide information to open an account, and must have a parent or guardian open an account and then, following agreement to a subscription plan, create a “Child Profile” for them within the parent or guardian’s own account.

Information We Collect. The Curious World App can be downloaded and the free content can be used without requiring a user to subscribe or provide any personal information.

If a parent (or legal guardian) wants to subscribe to Curious World and enjoy subscription-level benefits, we require the user to comply with an age-gate which asks for the user’s birthdate. If the age-gate is satisfied, a parent will be asked to register for an account with HMHCo by entering their first and last name, an email address and a password (see below “Terms of Use”). Once an HMHCo Account is established, the parent will be able to select from different subscription plans which can be purchased through the Apple iTunes Store using the parent’s Apple iTunes account as the method of payment or, if the user goes to the Curious World Site, by providing credit card or debit card payment information.

You may choose not to provide us with any personal information. In such event, you can still download and access free content on the Curious World App; however, neither you nor your child will be able to access and use content and receive services available only through a subscription.

If the user has subscribed to Curious World, on a paid or promotional trial basis, the user may establish up to four (4) child profile subaccounts (each, a “Child Profile”) by providing a name and birthdate and by selecting a different avatar (from an assortment of pre-set available designs) for each Child Profile. We encourage use of a first name or nickname to set up the Child Profile. The name and avatar will appear in the Curious World’s App’s interface so each child can identify and login to their own Child Profile. An HMHCo Account holder may set up, manage or change Child Profiles by logging in to their HMHCo Account which is accessible at the Curious World Site or, on a more limited basis, through the Curious World App.

HMHCo may retain, without any obligation to do so, any and all Child Profiles and associated account, usage data and other information even if a parent allows their subscription to lapse or expire. If a parent cancels a subscription plan, or allows a subscription period to expire or lapse without renewing, then HMHCo may retain or delete all information associated with the HMHCo Account and/or any and all Child Profiles that may have been set up in its sole discretion. HMHCo provides no assurances and guarantee, and shall have no liability or obligation to insure, that if a subscription plan expires, lapses or has been cancelled that upon reinstituting a subscription plan, previously established Child Profiles will be available or accessible or any learning or personalization features will be able to be recreated, recovered or resumed.

In addition, when users access and use Curious World, we may passively collect certain computer or device information, such as the type of device operating system (e.g., version of iOS), the user's IP Address, as well as other identifiers which may be unique (such as the physical WiFi address or platform-specific identifiers such as Apple’s Identifier for Advertising or similar identifiers), as well as non-personally identifiable information (such as how the app is used, the frequency with which users view or consume different content or offerings, and information regarding the user’s device’s technical attributes and characteristics, such as data about your operating system, hardware, display size, screen resolution, and network carrier information).

We or our service providers collect this information in order to make Curious World and our other offerings more interesting and useful to you and for other purposes related to HMHCo’s internal business needs. We (or one of our contractors on our behalf) may collect this information through the use of software technologies such as unique identifiers, such as device-based ids, or other tracking technologies.

How and When Do We Disclose Information to Third Parties? We will not share your Personal Information with third parties for those third parties' marketing purposes or for interest-based or "online behavioral advertising." We do disclose (or permit third parties to collect on our behalf) information in order to provide services to us (such as hosting, operating online services, tracking activities and analytics, delivering content), and to enable some or all of the App's functionality. Our service providers are not permitted to use your Personal Information for their own purposes without your express consent.

Please note that your and your children’s interactions with a mobile or tablet device where Curious World is installed may involve Apple (or other device manufacturer or provider) and those interactions are governed separately by Apple’s (or such other party’s) privacy policies and terms.

How do we use the Information? We may use the information we collect to:

  • Customize and/or personalize the viewing and content consumption experience of you or your child;
  • Better respond to customer service inquiries;
  • Communicate with you about your purchase, account information, or customer service needs;
  • Communicate with you about our products and events, and for other promotional purposes (unless you unsubscribe or notify us of your desire to withdraw permission for these kinds of communications);
  • Improve our business and the services being provided to you and other users;
  • Provide technical support to you; and
  • Perform any other lawful acts.

By subscribing to any subscription version of Curious World on the Curious World App, HMHCo also may use the email address provided in establishing the HMHCo Account to send the user promotional messages regarding HMHCo’s products and services. We will not sell or provide your email address to third parties to send you offers or promotions. You may revoke this right to send you promotional messages about HMHCo offerings at any time by unsubscribing through links in any of those emails or emailing your request to us at

We may also send alerts or notifications to your device as part of the usage and features of the Curious World App. These may include prompts or reminders to pay for a subscription that has lapsed or expired or to notify you of important information about the usage of the app.

We may also provide aggregated, non-personally identifiable information to third parties, including our licensors and suppliers of content or others, for any legal purposes whatsoever. Such aggregated information may include the number of users who searched for a particular content item, or how many users viewed or played with a particular content item and for how long on average. Such aggregated information does not identify you individually.

Interactions with Third-Party Sites. The Curious World App does not allow users to interact with or provide any functionality that depends upon or directs users to any third party web site or application (other than Apple and its iTunes Store for the purposes of paying for subscriptions to the paid service).

On the Curious World website, which is intended solely for use by parents, guardians or other adults, there is certain functionality that allows users to interact with and post or send user-generated content in a pre-templated fashion to Facebook or other third party platforms, social media sites and/or other applications or offerings.

The use of such functionality may involve your having to have an account and be logged-in with such third party operator or we may provide such third-party offerings’ interfaces or links on the service to facilitate your sending a communication from the service. For example, we may use third parties to facilitate emails, tweets or Facebook postings. We may also utilize advertising technologies and work with advertising partners which are able to promote the Curious World App to actual or potential users who, when they use or engage with such third party operators (such as Facebook) can be tracked based on use of such third party operators’ technology services to track whether such users have downloaded our Curious World App and/or subscribed to the Curious World services. In all cases, such third party advertising partners or technologies target and take step only to engage with such third party sites’ users who are or represented themselves to be 18 years old or older.

These third party operators may retain any information used or provided in any such communications or other activities that are tracked utilizing their technologies. These third parties' practices are not subject to our Privacy Policy. In some cases, such third parties will provide information back to us about you or your activity as a result of your interaction; in such cases, we will hold and use such information according to our Privacy Policy. We may not control or have access to your communications through these third parties. Further, when you use third-party operators or their services, you are using their services and not our services and you acknowledge that they, not we, are responsible for their practices. You should review the applicable third-party privacy policies before using such third-party tools on our service.

Administrative and Legal Reasons. We may also access, use, preserve, transfer and disclose your usage and personal information: (i) as required or permitted by applicable law, regulation, subpoenas, governmental requests or legal process; (ii) to investigate violations of potential violations of the Terms of Use; (iii) to protect the safety, rights, property or security of the services or any third party; and/or (iv) to detect, prevent or otherwise address fraud, security or technical issues. Such disclosures may be carried out without notice to you.

Affiliates and Business Transfer. We may share your personal information and usage information with our parent, subsidiaries and affiliates ("Affiliates"). We also reserve the right to disclose and transfer all such information: (i) to a subsequent owner, co-owner or operator of the services or applicable database; or (ii) in connection with a merger, consolidation, restructuring, the sale of substantially all of our interests and/or assets or other corporate change, including, during the course of any due diligence process.

What Information Do We Collect on Parts of Our App Directed to Children? We haven taken steps to have the Curious World App comply with the Children’s Online Privacy Protection Act (COPPA). For example, we do not use the Curious World App to collect personal information (as broadly defined by COPPA) for purposes of online behavioral advertising. We may, however, in compliance with COPPA, collect or share certain information to support our internal operations, such as for performing analytics, enabling or delivering certain types of content or features, and for improving or maintaining the Curious World App. Please note the Curious World App does not feature any functionality that allows children or other users to capture photos or user generated content or provide for embedded sharing. If you believe that we have collected personal information from someone under the age of 13, please contact us at:

Protecting Your Information. We use commercially reasonable efforts to safeguard and secure your personal information while stored on our computer systems. We use a variety of industry standard security measures, such as requiring of a unique username and password for each user as well as encryption and authentication tools, to maintain the confidentiality of your personal information. Your personal information is stored behind industry standard firewalls and is only accessible by a limited number of persons who are authorized to access such systems, and are required to keep the information confidential. We also use commercially reasonable efforts to safeguard and secure the transmission of your personal information from your computer to our computers. However, we are unable to guarantee that the security measures we take will not be penetrated or compromised or that your personal information will remain secure under all circumstances.

To help protect you and your children’s personal information, please make sure you have current anti-virus and firewall software installed on your device(s) and update such software and each device’s operating system software on a regular basis. Each user is responsible for maintaining the secrecy of his or her own or their children’s login and account or profile information and associated passwords. Also, please review the statements for your credit cards or other payment methods carefully and on a timely basis and please verify that all transactions are authorized and report any discrepancies immediately to your credit card company, bank or payment service provider.

Unsubscribing. We want to communicate with you only if you want to hear from us. If at any time you decide that you would like to stop receiving communications from us, you may email your request to, contact us using the link or the information included at the bottom of each email communication.

In some limited circumstances, such as to resolve disputes, troubleshoot problems and enforce our Terms, including the Terms of Use or Subscription Terms of Service, we may retain information you have requested us to remove. Further, your personal information is never completely removed from our databases due to technical constraints and the fact that we back up our systems. Therefore, you should not expect that all of your personal information will be completely removed from our databases in response to your requests. We reserve the right to send you certain communications related to our site that are considered part of your account, such as technical alerts, without offering you the opportunity to opt out of receiving them.

What About Changes to the Privacy Policy? We reserve the right to change this Privacy Policy at any time without notice to you. Any changes will be effective immediately upon the posting of the revised Privacy Policy. We will not use your personal information, however, in a manner materially different than promised at the time it was collected without your consent.

Who Can I Contact? If you have questions, comments or complaints regarding our Privacy Policy or the manner in which we or our service providers treat your personal information, contact us at

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