Comparison

Kappa Theater vs BookFolder

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

Head to head
About

Kappa Theater

Explore an original e-picture book series featuring cute Kappa characters and their daily adventures. Read stories in Japanese or English, with options to view as a blog or a full-screen picture book. Download episodes to enjoy offline.

Highlights
  • Original e-picture book series
  • Read in Japanese and English
  • Blog or picture book view modes
  • Downloadable episodes
  • Sophisticated user interface
  • High-quality original pictures add-on
Read full description

Shippo’s “Kappa Theater” app is coming out! It has been popular since she had uploaded to MySpace when it was the biggest social network at the time. Kappa Theater is the irregular serial story that is the part of the so-called a Blog, and the story goes on in the Ameba Blog. You can see the story from the first episode to the newest episode. (As soon as the newest episode comes out) And you can read in Japanese and in English too! When you hold the device in a portrait mode, you can read the story like a Blog. And when you hold the device in a landscape mode, you can read it as a picture book! The user interface is very sophisticated design, and you’ll get used to it soon. In advance, you can read 10 episodes, and you can download each episode (the episodes are 320 over) which you want to. This app makes people of all ages smile, and it’s free. Advanced Option : When you’ll buy this low price add-on, you can download the original picture(the big size). The original picture is very high quality, so you can use it for the big screen’s wallpaper. For further details, see below http://therootage.com/iphone/kappa-theater-en/ – Kappa Theater : “Hey, Shippo san” Kappa chan and his friends said to me. They were very innocent and cute, so I uploaded to MySpace to introduce them. I’ve been shown their daily life with their photos and words. Kappa chan and his friends failed, and they mean no harm. When Kappa chan and his friends do something bad, they apologize. Every Kappa chan has his own color. Everyone is different. They are friends even if everyone has their own thing. Everyone is different, but they’re friends and amazing. If they are same, we cannot recognize each of them. Kappa is a yokai (it’s a class of supernatural monster) found in Japanese folklore, and also a cryptic. the features are a carapace, webbed hands and feet, a plate (sara), which is a flat hairless region on top of their head that is always wet, and which is regarded as the source of their power. Their favorite food is cucumbers. There are many people who resembles Kappa. I wonder if Kappas blend to human lives they don’t even realize themselves. – About Author “Shippo” : written in August 2013 Japanese stuffed animals maker of gloves She was born in Akita prefecture and currently lives in Tokyo. From around 1994, she made stuffed animals (and puppet shows). The stuffed animals made by her had displayed centered at the library annex.(the puppet shows have closed) In the library annex, she has read picture books and taught craft works to children. She teaches making flannel graphs, toy theaters, hands play, and has lately taught magic. 10 years before, Families Children Support Center was formed. She took this opportunity to provide volunteer work for raising children. She makes happy hand made toys security and safety.In Families Children Support Center, a lot of animal puppets made of color gloves and made toys are there. She loves smile. Her conviction is based on the volunteer work for raising children. She told that she would go on working as the volunteer for raising children as long as she had good health no matter how busy she was. Also she said “Smiles of babies, kids, mums are really cute!!” From 2010, her works continues to gain a very good reputation at the varieties of exhibitions all over Japan.

About

BookFolder

Organize your PDF library with custom folders, cover images, and themes. Enjoy a personalized reading experience with features like split-screen multitasking and bookmarks. This free app offers a clean interface and essential reading tools.

Highlights
  • Custom folder organization
  • Custom cover images for PDFs
  • Split-screen multitasking on iPad
  • Multiple theme colors and icons
  • Dark Mode support
  • Bookmarks and table of contents
Read full description

Organize your PDFs, set custom covers, and choose from several theme colors and icons, for a pleasant reading experience just the way you want it. • Create folders and folder groups to keep your PDFs organized however you prefer. Rename and rearrange things as the mood takes you. Name every single book and folder the same thing, if you really want to! (I don’t recommend doing that, but nonetheless, that’s the sort of awesome power that you wield if you use BookFolder.) • Set custom cover images for every book (or stick with a book’s default cover, of course). Your library will look the way that you want it to! (And the underlying files remain pristine, so if you begin to regret choosing a photo of your cat for every book in your collection, you can always restore the originals and no one will know. Except your cat, who is judging you now.) • Get wild on an iPad with split-screen multitasking support. Read two books at once (or the same book twice)! If that’s something that you want to do. • Swap between five theme colors, for an interface that works best for you. (Dark Mode support, too, of course!) • Choose from a dozen icons, from solid colors to subdued platinum to a retro rainbow look, to fit your mood and to ensure a harmonious home screen layout with your other apps. (I’m not the only one who arranges my icons by color and design… am I?) • You can use it to actually read the PDFs, too, of course. Mustn’t forget that part. • Plus bookmarks, searching, and table-of-contents support, as one would expect. • Also, it’s free, no in-app purchases, no tracking… just a nice PDF reader and library manager. I hope that you’ll enjoy it!

Screenshots

Kappa Theater4 screens
BookFolder4 screens

Verdict

The call

The clearest difference is in-app purchases: BookFolder at none against Kappa Theater's 1. BookFolder also leads on update cadence (every 6 days vs every 4 months) and ratings volume (28 vs 1). Kappa Theater's advantage is rating (5.0 vs 4.7) and review sentiment (100% vs 88%). On price, ads and device support 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. Kappa Theater sells 1 one-off in-app purchase. BookFolder asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Kappa Theater holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: BookFolder has 28 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Kappa Theater's written reviews are positive against 88% of BookFolder's.

UpkeepUpdate frequency

Kappa Theater ships an update every 4 months, BookFolder every 6 days. Both last shipped on October 1, 2026.

Scorecard7 real differences · 3 level
Kappa Theater versus BookFolder: the parameters behind the verdict, then further details
ParameterKappa TheaterBookFolder
PriceFreeFree
Rating5.0 (1 ratings) — better4.7 (28 ratings)
Positive reviews100.0% of reviews — better88.2% of reviews
Number of ratings128 — better
Update frequencyEvery 4 monthsEvery 6 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.014.0 — better
Further details — not scored
Size21 MB2 MB
Age rating4+4+
DeveloperHidenori MatsuokaMolly Black

Customer experience

Kappa Theater

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

BookFolder

All ratings28 ratings
Positive92.9%
Neutral3.6%
Negative3.6%
Written reviews17 reviews
Positive88.2%
Neutral5.9%
Negative5.9%

In-app purchases

1 purchases

Kappa Theater

One-time1
  • Advanced Option$3.99
None

BookFolder

No in-app purchases

Questions

Is Kappa Theater free?
Kappa Theater is free to download, with in-app purchases available.
Is BookFolder free?
BookFolder is free to download, with no in-app purchases.
Which has better reviews, Kappa Theater or BookFolder?
Kappa Theater is rated higher. Kappa Theater averages 5.0 out of 5 from 1 ratings, while BookFolder averages 4.7 from 28 ratings.
Do Kappa Theater or BookFolder have ads?
Neither Kappa Theater nor BookFolder shows ads.
Which is updated more often, Kappa Theater or BookFolder?
Kappa Theater ships an update every 4 months, and BookFolder every 6 days. Most recently, Kappa Theater was updated on October 1, 2026 and BookFolder on October 1, 2026.

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