Sell books with World of Books: iPhone vs Android
Sell books with World of Books gets 1k+ downloads a day worldwide (AppInsider estimate, September 2026, rounded down to a band).
Sell books with World of Books by Ziffit.com is on both the App Store and Google Play. Here are both versions together: downloads, users, revenue, ratings and chart positions, store by store with totals.
Rating
4.2 ★
24k ratings, both stores
Measured
Best rank now
#19
Android · 
Lifestyle Free
Lifestyle FreeMeasured
App Store
App details
App ID
717131141
Publisher
Ziffit LTD
Minimum OS
iOS 16.0+
Content rating
4+
Languages
1
EN
Size
119 MB
Google Play
App details
App ID
uk.co.brightec.ziffit
Publisher
World of Books
Content rating
Everyone
Sell books with World of Books downloads & installs
Both stores, worldwide. Bands are open; exact numbers are free with an account.
| Store | Downloads / day | Lifetime installs |
|---|---|---|
| iPhone | 500+ | – |
| Google Play | 100+ | 1M+ Measured |
| Total | 1k+ Confidence | 1M+ Confidence |
How this is calculated
iPhone: chart positions and rating growth per country, anchored on its own Android downloads; lifetime from ratings worldwide × installs per rating. Google Play: the daily change in its exact install count. The total adds every store.
Where Sell books with World of Books's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks now
Both stores, across every country we track.
Ratings
Both stores. Store data, measured.
| Store | Rating | Ratings |
|---|---|---|
| App Store | 4.2 ★ | 12k |
| Google Play | 4.2 ★ | 12k 7 written reviews |
| Both stores | 4.2 ★ weighted by ratings | 24k |
About Sell books with World of Books
The Sell books with World of Books app makes it easy to earn extra money and declutter your home. Download the free app (previously known as Ziffit) to turn your used books and textbooks into cash.
• Sell books or textbooks instantly
• Scan barcodes with your iPhone or iPad
• Get an instant quote and complete your trade
• Ship your books for free with DPD, Collect+ or InPost
• Receive quick payments directly to your bank or PayPal account or via cheque
With the Sell books with World of Books app, you can quickly and easily sell your used books. Simply scan barcodes, receive a quote, and complete the trade.
Curious about the value of your book collection? The app can tell you that, too.
The app is completely free, with no costs at any stage. Shipping is covered, and payments are completed within days — not weeks. Download the Sell books with World of Books app today and start selling whenever and wherever you like. Plus, first-time traders receive an extra 10% on their initial trade!
• Sell books or textbooks instantly
• Scan barcodes with your iPhone or iPad
• Get an instant quote and complete your trade
• Ship your books for free with DPD, Collect+ or InPost
• Receive quick payments directly to your bank or PayPal account or via cheque
With the Sell books with World of Books app, you can quickly and easily sell your used books. Simply scan barcodes, receive a quote, and complete the trade.
Curious about the value of your book collection? The app can tell you that, too.
The app is completely free, with no costs at any stage. Shipping is covered, and payments are completed within days — not weeks. Download the Sell books with World of Books app today and start selling whenever and wherever you like. Plus, first-time traders receive an extra 10% on their initial trade!
Sell books with World of Books iPhone
Sell books with World of Books gets 1k+ downloads a day worldwide (AppInsider estimate, September 2026, rounded down to a band).
Sell books with World of Books is #28 in Lifestyle Free in United Kingdom and charting in 1 of 24 countries we track.
Updated 27 Sep 2026 · rankings refresh through the day
DeveloperZiffit.com
CategoryLifestyle
PriceFree
Released
Rating★ 4.2 (12k)
Version7.1.0
Age rating4+
First seen by us 25 Sep 2026
25 Sep 2026Rating
4.2 ★
12k ratings
Measured
Best rank now
#28
Lifestyle FreeMeasured
Sell books with World of Books on the App Store
App details
App ID
717131141
Publisher
Ziffit LTD
Minimum OS
iOS 16.0+
Content rating
4+
Languages
1
EN
Size
119 MB
Sell books with World of Books downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. iPhone downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Where Sell books with World of Books's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks now
Every top chart it appears in across 24 countries.
| Country | Charts | Rank |
|---|---|---|
| United Kingdom | LifestyleFree | #28 |
Apps near Sell books with World of Books on the chart
Lifestyle Free, around #28.
Ratings
App Store, worldwide.
Rating
4.2 ★
12k ratings
Measured
Ratings
12k
Measured
About Sell books with World of Books
The Sell books with World of Books app makes it easy to earn extra money and declutter your home. Download the free app (previously known as Ziffit) to turn your used books and textbooks into cash.
• Sell books or textbooks instantly
• Scan barcodes with your iPhone or iPad
• Get an instant quote and complete your trade
• Ship your books for free with DPD, Collect+ or InPost
• Receive quick payments directly to your bank or PayPal account or via cheque
With the Sell books with World of Books app, you can quickly and easily sell your used books. Simply scan barcodes, receive a quote, and complete the trade.
Curious about the value of your book collection? The app can tell you that, too.
The app is completely free, with no costs at any stage. Shipping is covered, and payments are completed within days — not weeks. Download the Sell books with World of Books app today and start selling whenever and wherever you like. Plus, first-time traders receive an extra 10% on their initial trade!
• Sell books or textbooks instantly
• Scan barcodes with your iPhone or iPad
• Get an instant quote and complete your trade
• Ship your books for free with DPD, Collect+ or InPost
• Receive quick payments directly to your bank or PayPal account or via cheque
With the Sell books with World of Books app, you can quickly and easily sell your used books. Simply scan barcodes, receive a quote, and complete the trade.
Curious about the value of your book collection? The app can tell you that, too.
The app is completely free, with no costs at any stage. Shipping is covered, and payments are completed within days — not weeks. Download the Sell books with World of Books app today and start selling whenever and wherever you like. Plus, first-time traders receive an extra 10% on their initial trade!
Latest updates
7.1.0
We've updated the app with some new features and improved stability and performance.
More from Ziffit.com
Sell books with World of Books Android
Sell books with World of Books gets 1k+ downloads a day worldwide (AppInsider estimate, September 2026, rounded down to a band).
Sell books with World of Books is #19 in Lifestyle Free on Google Play in United Kingdom and charting in 1 of 15 countries we track.
Updated 27 Sep 2026 · rankings refresh through the day
DeveloperWorld of Books
CategoryLifestyle
PriceFree
Released–
Installs1M+
Rating★ 4.2 (12k)
Updated
Content ratingEveryone
Rating
4.2 ★
12k ratings
Measured
Best rank now
#19
Lifestyle FreeMeasured
Sell books with World of Books on Google Play
App details
App ID
uk.co.brightec.ziffit
Publisher
World of Books
Content rating
Everyone
Sell books with World of Books downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Google Play shows an exact lifetime install count; downloads per day are its daily change (measured). When Play hasn't refreshed the count, they come from new ratings and Top Free chart positions. Confidence is the chance the real number is within half to double ours.
Where Sell books with World of Books's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks on Google Play
Every top 200 chart it appears in across 15 countries.
| Country | Charts | Rank |
|---|---|---|
| United Kingdom | LifestyleFree | #19 |
Apps near Sell books with World of Books on the chart
Lifestyle Free, around #19.
Ratings
Google Play, worldwide.
Rating
4.2 ★
12k ratings
Measured
Ratings
12k
Measured
Written reviews
7
Measured
About Sell books with World of Books
The Sell books with World of Books app makes it easy to earn extra money and declutter your home. Download the free app (previously known as Ziffit) to turn your used books and textbooks into cash.
• Sell books or textbooks instantly.
• Scan barcodes with your phone or tablet
• Get an instant quote and complete your trade
• Ship your books for free with DPD, Collect+ or InPost
• Receive quick payments directly to your bank or PayPal account or via cheque
With the Sell books with World of Books app, you can quickly and easily sell your used books. Simply scan barcodes, receive a quote, and complete the trade.
Curious about the value of your book collection? The app can tell you that, too.
The app is completely free, with no costs at any stage. Shipping is covered, and payments are completed within days—not weeks. Download the Sell books with World of Books app today and start selling whenever and wherever you like. Plus, first-time traders receive an extra 10% on their initial trade!
• Sell books or textbooks instantly.
• Scan barcodes with your phone or tablet
• Get an instant quote and complete your trade
• Ship your books for free with DPD, Collect+ or InPost
• Receive quick payments directly to your bank or PayPal account or via cheque
With the Sell books with World of Books app, you can quickly and easily sell your used books. Simply scan barcodes, receive a quote, and complete the trade.
Curious about the value of your book collection? The app can tell you that, too.
The app is completely free, with no costs at any stage. Shipping is covered, and payments are completed within days—not weeks. Download the Sell books with World of Books app today and start selling whenever and wherever you like. Plus, first-time traders receive an extra 10% on their initial trade!
What's new in 7.1.0 (#17503)
We've updated the app with some new features and improved stability and performance.