Comparison

TwinViewer vs K&S(写真共有カレンダー)

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

Head to head
About

TwinViewer

View and compare two photo albums side-by-side. This app allows you to pick the best shots, delete unwanted ones, create combined images, and access detailed EXIF data. It offers intuitive gestures for navigation and zooming.

Highlights
  • Dual-screen photo viewing
  • Side-by-side photo comparison
  • Create combined images
  • View EXIF data
  • Zoom and swipe navigation
  • Sync/Async viewer modes
Features
Read full description

TwinViewer is a dual-screen photo viewer application. You can view two different albums simultaneously, compare two photos side by side, pick a better shot, or leave one and delete another. This is more than just a viewer. You can also create side-by-side combined images, get the detailed EXIF data, etc. ----- HOW TO USE ----- - Swipe left/right to browse next/previous photo. - Pinch open/close with two fingers to zoom in/out. - Double tap either one to display in full-screen mode. - Sync/Async button to switch the sync mode between two viewers. - Swap button to switch two viewers. - Grid Lines button to show/hide grid liens. - EXIF Data button to show/hide data such as image size or shooting date. - Snapshot button to created and share side-by-side images. * Please note that this application can be downloaded for free, but in-app purchase is required to use all functions.

About

K&S(写真共有カレンダー)

Features
Read full description

K&Sは、カップル2人で1つのカレンダーを共有し、その日の写真を日付ごとに残せるアプリです。 予定を管理するためではなく、ふたりの毎日を写真で記録し、あとからカレンダーから見返すために作りました。 【主な機能】 ・カレンダーIDを共有して、2人で1つのカレンダーを利用 ・それぞれ1日2枚まで写真を投稿 ・2人で「せーの」で押すと、共通写真の投稿枠が解放 ・投稿状況をカレンダーの色で確認 ・日付をタップして、その日の写真を一覧表示 ・写真を端末に保存 ・カレンダーの色、背景、フォントを自由にカスタマイズ 毎日の何気ない写真も、日付に残すとふたりだけの思い出になります。 K&Sで、今日の一枚を積み重ねてみてください。 ※本アプリには広告が表示されます。

Screenshots

TwinViewer4 screens
K&S(写真共有カレンダー)4 screens

Verdict

The call

The clearest difference is in-app purchases: K&S(写真共有カレンダー) at none against TwinViewer's 1. K&S(写真共有カレンダー) also leads on update cadence (every 2 days vs every 5 weeks). TwinViewer's advantage is ads (none vs shown). On price, device support and iOS requirement 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. TwinViewer sells 1 one-off in-app purchase. K&S(写真共有カレンダー) asks for nothing beyond the download.

UpkeepUpdate frequency

TwinViewer ships an update every 5 weeks, K&S(写真共有カレンダー) every 2 days. The most recent releases landed on October 29, 2026 and September 26, 2026 respectively.

Scorecard3 real differences · 7 level
TwinViewer versus K&S(写真共有カレンダー): the parameters behind the verdict, then further details
ParameterTwinViewerK&S(写真共有カレンダー)
PriceFreeFree
Rating4.0 (24 ratings) — better—
Positive reviews63.4% of reviews—
Number of ratings24 — better—
Update frequencyEvery 5 weeksEvery 2 days — better
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.015.1 — better
Further details — not scored
Size1 MB130 MB
Age rating4+4+
DeveloperMasako SakanashiSota Fukuhara

In-app purchases

1 purchases

TwinViewer

One-time1
  • Full Version$4.99
None

K&S(写真共有カレンダー)

No in-app purchases

Questions

Is TwinViewer free?
TwinViewer is free to download, with in-app purchases available.
Is K&S(写真共有カレンダー) free?
K&S(写真共有カレンダー) is free to download, with no in-app purchases.
Do TwinViewer or K&S(写真共有カレンダー) have ads?
K&S(写真共有カレンダー) shows ads; TwinViewer does not.
Which is updated more often, TwinViewer or K&S(写真共有カレンダー)?
TwinViewer ships an update every 5 weeks, and K&S(写真共有カレンダー) every 2 days. Most recently, TwinViewer was updated on October 29, 2026 and K&S(写真共有カレンダー) on September 26, 2026.

Other comparisons