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SideBooks Downloads & RevenueSideBooks · App Store

SideBooks is #70 in Books Free in Japan and charting in 1 of 30 countries we track.

Updated 8 Nov 2026 · rankings refresh through the day

DeveloperTatsumi-system Co., Ltd.
CategoryBooks
PriceFree
Released
Rating★ 3.6 (1.3k)
Version2.91.1
Age rating4+
First seen by us 24 Sep 2026
Installs (est.)100k+ worldwide

SideBooks update history & changes

Last change · 8 events since 19 Dec 2010Full timeline ↓
Full timeline · 8 events
  1. 📦
    SideBooks updated to version 2.91.1
    *Fixed an issue where the window control buttons in the top-left corner would overlap with the "Back" button when using the app in a window on an iPad running iOS 26 or later.
  2. 📦
    SideBooks updated to version 2.91.0
    ・細かな機能修正およびバグ修正
  3. 📈
    SideBooks entered the top 100
    Top Free · Books · ID
  4. 📈
    SideBooks charting in a new country
    Indonesia
  5. 🆕
    SideBooks first spotted by AppInsider
    #81 in Top Free · Books · Japan
  6. 📦
    SideBooks version 2.90.4
    No release notes
  7. 🆕
    SideBooks released on the App Store

Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.

Monthly users
all platforms
Rating
3.6 ★
1.3k ratings
Measured
Best rank now
#70
Books Free
Measured
New ratings a week
2.5
▲ +200% vs the 2 weeks before
Measured
Exact figures, their ranges and how sure we are, free with an account.Sign up freeSign in

SideBooks on the App Store

App details

App ID
409777225
Publisher
Tatsumi-System Co., Ltd.
On the store since
Dec 2010
15 years on the store
Minimum OS
iOS 15.0+
iPhone 6s and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
5
EN JA KO ZH ZH
Size
35 MB
Also listed in
Books, Utilities