Comparison

Sumizeit vs ThinkBetter

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Sumizeit

Access concise summaries of non-fiction books in text, audio, infographic, podcast, and video formats. Learn key insights from experts in personal development, career, health, and more, in just minutes a day. Offers short audio courses for further learning.

Highlights
  • Text, audio, video book summaries
  • Infographic and podcast summaries
  • Short audio courses
  • Personal development topics
  • Career and success advice
  • Expert-curated content
  • Send summaries to Kindle
Features
Read full description

Sumizeit is more than a book summary app. It's your all-in-one app for learning, personal growth, and mindfulness. Get the key ideas from 1,000+ bestselling nonfiction books in just 15 minutes — or even 5. Then go beyond books with bite-sized courses, skill-building lessons, daily challenges, riddles, podcast summaries, and guided sessions for meditation, sleep, relaxation, and focus. Whether you have 5 minutes or an hour, Sumizeit helps you make the most of your time. READ LESS. LEARN MORE. GROW EVERY DAY. WHY SUMIZEIT? Most book summary apps stop at summaries. Sumizeit goes further. Read a book summary on your commute. Take a quick course during lunch. Challenge your brain with a daily riddle. Build a practical skill. Listen to a podcast summary while walking. Or unwind with a guided meditation before bed. One app. More ways to grow. WHAT YOU GET WITH SUMIZEIT • 1,000+ BOOK SUMMARIES Discover the key ideas from bestselling nonfiction books including Atomic Habits, The Lean Startup, Thinking, Fast and Slow, The 4-Hour Workweek, and hundreds more. • 5 & 15-MINUTE SUMMARIES Short on time? Choose between quick 5-minute summaries and more detailed 15-minute versions. • TEXT, AUDIO, VIDEO & INFOGRAPHICS Learn your way. Read, listen, watch, or explore visual summaries. • BITE-SIZED COURSES Go beyond books with short courses covering fascinating and useful topics. Learn something new without sitting through hours of lectures. • MIND: MEDITATION, SLEEP & FOCUS Learning isn't always about consuming more information. Give your mind time to reset with guided sessions for meditation, relaxation, sleep, focus, and mindfulness. • DAILY CHALLENGES & RIDDLES Exercise your brain every day with quizzes, riddles, interesting questions, and challenges. Earn points, build streaks, and turn learning into a daily habit. • SKILL CARDS Build useful skills through bite-sized lessons and practical exercises. • QUIZZES & EXERCISES Test what you've learned and turn ideas into action with quizzes, exercises, and expert analysis. • PODCAST SUMMARIES Get the biggest ideas and takeaways from popular podcast episodes in minutes. • PERSONALIZED RECOMMENDATIONS Tell us your interests and goals, and we'll help you discover what to learn next. • HIGHLIGHTS & NOTES Save important ideas, highlight passages, and build your own personal knowledge library. • COMMUNITY Discuss books, exchange ideas, and learn with other curious people. • SEND TO KINDLE Send summaries directly to your Kindle and read wherever you prefer. • DARK MODE Enjoy a comfortable reading experience day or night. • NEW CONTENT EVERY WEEK New summaries and learning experiences are added regularly. MAKE 5 MINUTES COUNT Read a summary. Learn a new skill. Take a course. Solve a riddle. Test your knowledge. Discover a podcast. Meditate. Relax before bed. Sumizeit turns the small moments in your day into opportunities to learn, think, grow, and recharge. WHAT REVIEWERS ARE SAYING "It's like Spark Notes for adults." — Mashable "An incredibly easy way to absorb the biggest of thoughts." — Cult of Mac "An excellent tool for those looking to expand their knowledge efficiently." — AppReview360 Start learning today. Terms and Conditions: https://sumizeit.com/terms Privacy Policy: https://sumizeit.com/privacy

About

ThinkBetter

Enhance your decision-making and understanding of the world by learning about cognitive biases and mental models. This app offers weekly insights, real-life examples, and quizzes to help you master these concepts for personal and professional growth.

Highlights
  • Weekly "brain concept" unlocked
  • Real-life examples and applications
  • Daily life decoder
  • Gorgeous illustrations
  • Interactive training program
  • Path selection for goals
  • Understanding quizzes
  • Podcast-style audio narration
Features
Read full description

Hey there, curious mind… Ever wondered why sometimes it seems like your brain is betraying you? How can you make better decisions in your professional and personal life? And better understand the world around you? Crack your brain open (figuratively, that is!), improve your critical thinking and decision making with cognitive biases and mental models, and understand the hidden forces that influence how you think and act. But more importantly… master them! Why ThinkBetter? — Weekly Wisdom: Unlock a new "brain concept" every week. That's 54 mental models and cognitive biases a year. — Relatable Realness: We sprinkle real-life examples to help you truly grasp the essence of each mental model or cognitive bias. Because, let's be honest, theory is cool but real-world application is cooler! — Your Day-to-Day Decoder: Discover how these tricks affect your daily life. Be it in your career, during your grocery store run, or even in your favorite TV show binge sessions. — Gorgeous Graphics: Because we all love beautiful things, each mental model or cognitive bias is paired with a gorgeous illustration. — Like a training program: rather than throw these at you in a lengthy blog post, we dive into each weekly and send you reminders, prompts to reflect on them and more. — Pick a path - choose from one of our default paths that groups and delivers to you the most relevant models and biases for your goals ("Thinking Clearly", "Making Better Decisions", "Master Your Attention" and more) — Did you really get it? Test your understanding of these models and biases with quizzes for each. — Not just read it… hear it… each of the 54 cognitive biases and mental models comes with podcast-style audio-narration so you can listen to it on the go. — Explore Professional Application — get better at your professional life by exploring how you can leverage these concepts to make better decisions and stress less. What are mental models and cognitive biases? Picture this – your brain is like a massive toolshed. Each tool (or set of tools) represents a way of understanding the world. Some tools are perfect for some jobs (like a hammer for a nail) and terrible for others (ever tried cutting a tomato with a hammer? Spoiler alert: It's messy!). Each of these tools in your cerebral toolshed is what we call a "mental model". These are frameworks or blueprints that help us make sense of the world, make decisions, and solve problems. For example, the "supply and demand" mental model helps us understand why those concert tickets are so darn expensive! Now, imagine if sometimes, when reaching into your toolshed, your hand has a sneaky little magnet that draws it to a particular tool, even if it's not the best for the job. That sneaky magnet? That's a cognitive bias. It's a predictable pattern where our judgment goes a tad awry. For instance, ever noticed how you might love a song just because it's constantly on the radio? Even if initially you weren't a fan? Or, have you ever bought a gigantic pack of cookies, telling yourself you'll just eat one a day, but then find the empty packet next to you while binge-watching your favorite show? Yep, that’s a bias right there. Our brain says, "Future me will TOTALLY have more self-control", but present you says, "I mean... just one more cookie can't hurt, right?" We’ll help you master these tools and magnets so you can make better decisions and live a better life. Tap "Get" and let the mind games begin! ______ Terms of use: https://thinkbetter.app/terms Privacy policy: https://thinkbetter.app/privacy

Screenshots

Sumizeit4 screens
ThinkBetter4 screens

Verdict

The call

The clearest difference is update cadence: Sumizeit at every 3 days against ThinkBetter's monthly. Sumizeit also leads on ratings volume (281 vs 6) and rating (4.5 vs 4.3). ThinkBetter's advantage is review sentiment (100% vs 78%). On price, ads, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Sumizeit sells 19 in-app purchases, starting at $0.99 per year and ThinkBetter sells 9 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Sumizeit holds the better App Store score, 4.5 against 4.3. That said, the two scores are not equally well evidenced: Sumizeit has 281 ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 78% of Sumizeit's written reviews are positive against 100% of ThinkBetter's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Sumizeit ships an update every 3 days, ThinkBetter monthly. The most recent releases landed on September 23, 2026 and September 21, 2026 respectively.

Scorecard4 real differences · 6 level
Sumizeit versus ThinkBetter: the parameters behind the verdict, then further details
ParameterSumizeitThinkBetter
PriceFreeFree
Rating4.5 (281 ratings) — better4.3 (6 ratings)
Positive reviews77.8% of reviews100.0% of reviews — better
Number of ratings281 — better6
Update frequencyEvery 3 days — betterMonthly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.115.1
Further details — not scored
Size59 MB49 MB
Age rating4+4+
DeveloperScomy IncBits of WOW

Customer experience

Sumizeit

All ratings281 ratings
Positive88.6%
Neutral3.2%
Negative8.2%
Written reviews27 reviews
Positive77.8%
Neutral3.7%
Negative18.5%

ThinkBetter

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Sumizeit

Reported bugs

8 issues
  • Crashes when opening Challenges
  • Crashes when bookmarking
  • Crashes when selecting interests
  • App crashes immediately on various actions
  • Login with Gmail not working
Show 3 more
  • Account not updating from free to lifetime
  • Dark mode not functioning correctly
  • Summaries oversimplified, missing key information

Requested features

2 requests
  • More video summaries
  • Sign In with Apple

ThinkBetter

Not enough reviews yet to summarise bugs or requests.

In-app purchases

19 purchases

Sumizeit

Subscriptions14
  • Sumizeit Yearly Subscription$0.991 Year
  • Sumizeit Monthly Subscription$0.991 Month
  • SumizeitMonthly$4.991 Month
Show 11 more
  • Sumizeit Monthly Subscription$4.991 Month
  • Sumizeit Monthtly Subscription$5.991 Month
  • Sumizeit Monthly$6.991 Month
  • Sumizeit Yearly Subscription$7.991 Year
  • Sumizeit Premium Monthly$12.991 Month
  • SumizeItYearlySubscription$24.991 Year
  • Sumizeit Yearly 50% off$24.991 Year
  • Sumizeit Yearly Subscription$39.991 Year
  • Subscription Annual $39.99$39.991 Year
  • Sumizeit Yearly Subscription$49.991 Year
  • Sumizeit Yearly Subscription$69.001 Year
One-time5
  • Intelligence Type Test Results$0.99
  • 20 Infographics$9.99
  • 20+ Infographics$19.99
Show 2 more
  • Sumizeit Lifetime Subscription$69.99
  • Sumizeit Lifetime$99.99
9 purchases

ThinkBetter

Subscriptions3
  • Special Offer Subscription$0.991 Month
  • Full Access Super Promo$0.991 Month
  • Monthly Subscription$1.991 Month
One-time6
  • Full Access Super Promo$4.99
  • ThinkBetter Plus$5.99
  • Full Access Special Offer$7.99
Show 3 more
  • ThinkBetter Plus$7.99
  • Full Access$9.99
  • ThinkBetter Plus$9.99

Questions

Is Sumizeit free?
Sumizeit is free to download, with in-app purchases available.
Is ThinkBetter free?
ThinkBetter is free to download, with in-app purchases available.
Which has better reviews, Sumizeit or ThinkBetter?
Sumizeit is rated higher. Sumizeit averages 4.5 out of 5 from 281 ratings, while ThinkBetter averages 4.3 from 6 ratings.
Do Sumizeit or ThinkBetter have ads?
Neither Sumizeit nor ThinkBetter shows ads.
Which is updated more often, Sumizeit or ThinkBetter?
Sumizeit ships an update every 3 days, and ThinkBetter monthly. Most recently, Sumizeit was updated on September 23, 2026 and ThinkBetter on September 21, 2026.

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