How to check whether an app or game works on iPhone Duo

The directory currently holds 7,609 apps across 8,802 regional records, and 97% of them are still marked not checked. So the first question when you look up an app is not whether it is good — it is whether anyone has looked at it yet.

Done a few times, the whole check takes about thirty seconds.

1. Three steps

1. Search: type the app name into the search box in the header; it works on every page.
2. Read the badge: adapted, partially adapted, in progress, not adapted, or not checked.
3. Open the details: tap the card to check the store version, tested version, iOS version, supported devices and test date.

2. What the five states mean

• Adapted: main layouts, the fold transition and core actions have all been checked by hand — use it with confidence.
• Partially adapted: core functions work, but some screens still stretch, split badly or leave gaps; usable, just watch those screens.
• In progress: the developer is on it, or a known issue is being fixed; watch the next release.
• Not adapted: a blocking problem has been recorded; do not count on it for now.
• Not checked: nobody has looked yet — this is not a verdict, so do not read it as “does not work”.

The criteria live on the inclusion standard page. A status is always tied to a version, and a new release does not inherit an old result.

3. Search by name

The header search accepts four kinds of input: app name, developer, App ID and aliases (Chinese and English names, abbreviations). Two characters bring up a dropdown; picking a result jumps to the card and highlights it.

• If nothing appears, try the other language: apps in the China store often have two names, and both are usually in the aliases;
• To see everything from one developer, search the developer name;
• If you only remember the icon, browse by category instead.

4. Filter by region and status

To the left of the search field on the homepage is the region switch: China / United States / Japan. The three storefronts are separate datasets, so the same app can have a different version and a different result in each.

Below that sits the filter row:

• Category: Apple's official categories, 25 of them in the current data; picking one sorts the list by that category chart;
• Status: six buttons (all plus the five states), each with a live count — the fastest way to see how many results a region actually has;
• Compatibility rate: one of the homepage stats, computed as (adapted + partially adapted) ÷ apps tracked in that storefront.

5. Open the details

Six fields are worth reading in the dialog:

• Rank / category rank: current free-chart position, plus the position in its category chart;
• Store version: what is on the App Store right now;
• Tested version: what was actually tested. When the two differ, the dialog flags a newer version — the result may need another check;
• iOS version: the system version at test time;
• Supported devices: which of iPhone / iPad / Mac / Watch / Vision the store lists;
• Notes and evidence: the verification note and any public sources it cites.

At the bottom sit the status badge and a direct App Store link for that region.

6. Games have their own page

Games live on the Games page: 480 games across 512 regional records. Its filters add one dimension:

• Region: including “all regions”, so you can see all three at once;
• Status: all five;
• Device support: iPad available / no iPad listed.

The iPad filter needs a caveat: it comes from the device list the App Store returns, which only says the store lists iPad support — not that anyone has tried it on a Duo. As of October 24, 2026, all 512 game records list iPad, so the filter is currently more of a confirmation than a filter. What actually describes the experience is still the status badge and the verification records.

7. If you only want apps that work

Skip the list-by-list browsing and open the compatibility list: adapted and partially adapted only, deduplicated per app, 169 apps today (165 adapted, 4 partially adapted). It can be narrowed further by region, status and category.

For apps worth actually trying, see Recommended — 35 apps, all verified as adapted in the China store.

8. Language and region move together

The site speaks Simplified Chinese, English and Japanese. Switching language also switches region: Chinese to China, English to the US, Japanese to Japan. Because the three storefronts are separate datasets, an app may be unchecked in Japan while it already has a result in China — “not checked” there says nothing about the China record.

9. When nothing turns up

Two different cases:

• No result at all: the app is not tracked yet (coverage is the free charts, the top 50 of each category chart, plus manual additions);
• Found, but no result: nobody has checked it yet, so the status reads “not checked”.

Either way, the feedback form in the footer is the place to report it. A link to the App Store plus the specific screen that misbehaves unfolded is far more useful than a name alone.

10. Three common misreadings

• Not checked is not the same as not compatible. 97% of records sit in this bucket; it only means nobody has looked.
• iPad support is not the same as adapted. An iPad build means the layout probably will not break, but aspect ratio, touch placement and whether a fold interrupts the session still need their own check.
• The store version is not the tested version. A result is tied to the version that was tested, so a store update can make it stale.

11. One-minute checklist

1. Search the name in the header → 2. read the status badge → 3. open the details for tested version and date → 4. if the versions differ, treat it as needing a recheck → 5. if there is no record, send feedback.