Parents & KidsDigital & Mobile LearningApps for iOS Devices Apps for iOS Devices HMH Apps include a variety of products that extend and enrich many of our award-winning programs. From the full curriculum of the HMH Fuse™ app, to the engaging practice of MathStax, to the vocabulary support offered through our HMH French Vocabulary and HMH Spanish Vocabulary apps, we've got you covered! View More Featured Pre-K–Kindergarten Apps Curious World™ Ages 3–7 Curious About Me Ages 3–6 Curious About Letters Ages 3–6 Curious About Shapes and Colors Ages 3–6 Curious George® at the Zoo Ages 3–6 View More Featured K–8 Apps David Wiesner's Spot Ages 6-8 Singapore Math®, Bar Models Grade 3 Singapore Math®, Bar Models Grade 4 Singapore Math®, Bar Models Grade 5 HMH Math on the Spot Grades K-8 View More Featured 9–12 Apps NumberStax Ages 12-18 Biology Games Grades 9–12 Chemistry Games Grades 9–12 Physics Games Grades 9–12 HMH French Vocabulary Grades 6–12 View More Featured Adult Apps Peterson Field Guides: A Field Guide to Birds of North America Peterson Backyard Birds: A Field Guide to Birds of North America Peterson Birds Pocket Edition: A Field Guide to Birds of North America American Heritage Dictionary, Fifth Edition American Heritage Medical Dictionary Curious World™ is a trademark of Houghton Mifflin Harcourt. Singapore Math® is a trademark owned by Singapore Math Inc. and Marshall Cavendish Education Pte. Ltd. Apple, the Apple logo, iPad, and iBooks are trademarks of Apple Inc., registered in the U.S. and other countries. App Store is a service mark of Apple Inc. HMH Fuse™ is a trademark of Houghton Mifflin Harcourt Publishing Company. CURIOUS GEORGE, created by Margret and H.A. Rey, is copyrighted and trademarked by Houghton Mifflin Harcourt. All rights reserved.