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TL;DR: Learn in your free time with a Headway lifetime subscription, now $69.99 (reg. $299.95).
Books are long and time is short. If you like the idea of learning in your spare time without dragging yourself through a 600-word tome, take a look at Headway. Headway turns key ideas from over 2,000 titles into 15-minute summaries, so you can learn the good parts without the huge time sink. It's also only $69.99 for a lifetime subscription (reg. $299.95).
How does Headway work?
Headway is an easy way of making a habit out of learning. Just open up the app and search through categories like personal development, business, health, and fiction. Once you pick something interesting, you can read or listen to a summary that covers the core ideas in about 15 minutes. Summaries are available in both text and audio, narrated by professional voice actors, so you can read on your lunch break or listen on a commute without losing anything. Progress syncs across all your devices, so switching between your phone and laptop mid-summary isn't a problem.
Headway's collection covers nonfiction and fiction, so it's not just business books and productivity frameworks. If you want to actually get through a novel you've been meaning to read for years, Headway can help with that, too.
Headway even helps you find new things to read and new ways to grow. Personalized self-growth plans sequence books toward a goal you set, so you're moving through material that actually connects to something. Spaced repetition brings key ideas back before they fade. Highlights save as interactive flashcards, and a skill tree maps your progress so you can see what you've covered and what's worth exploring next.
Right now, it's only $69.99 to get a Headway Premium Lifetime Subscription.

Headway Premium: Lifetime Subscription
StackSocial prices subject to change.