We monitor 175 App Store storefronts to answer one question —

Is Collision of math connoisseurs censored by Apple?

Gone.

Collision of math connoisseurs is gone from every App Store storefront we test. It was last seen available on Oct 25, 2019.

575 tests on record·last checked 2 months ago

Why it is unavailable

Five things can put an app out of one App Store. Each is weighed below against what can be seen from outside — open a card for the reasoning.

  • A government or a court demanded itLikely

    and Apple complied. Apple publishes a count of these per country each year and never says which apps they were. Apple's 2025 App Store Transparency Report

  • Apple applied a rule, unaskedLikely

    either its own review guidelines, or its own reading of a local law, with nobody having demanded anything. This is the largest category in Apple's own removal figures by a wide margin, and it covers distribution permits as well as content — Apple kept a free Bible app out of mainland China in 2021 for want of one. Apple's 2025 App Store Transparency Report

  • The developer withheld itUnlikely

    freely, or under legal advice of their own, or because Apple's guidelines require that kind of app to be limited to certain countries. Switching a country off is easy for a developer to do in Apple's own tools: it needs no new version of the app, and it leaves no public trace other than the app being unavailable.

  • Something brokeUnlikely

    a rejected update, a lapsed certificate, a payment or licensing problem, a mistake nobody has got round to noticing.

  • A local rule about paying for itRuled out

    gambling licences, financial rules, tax — the kind of law that governs a transaction. Apple can obey every one of them by refusing the payment, which is why this is the only restriction we would accept and the only one that cannot touch a free app.

    • It is free, so Apple sells nothing here.
How this is weighed, and what it cannot tell you

Weighed from the evidence under each card, not from a model. There is no published figure for how Apple's removals divide up, so these are ordered words rather than percentages. For scale on the same-day counts: across the whole record an app leaves a storefront with fewer than two others, so a dozen at once is not a dozen coincidences.

None of this is certain, and a citation does not make it so: Apple naming a Chinese agency tells you what Apple said, not everything that happened. What can be said is that the readings alone cannot separate these five — a developer switching off a country and a government ordering it removed arrive at Apple's catalogue looking identical — and that nobody has ever measured how they divide across the App Store. The one careful study of the question was done on Google's store, using an error message Apple does not emit.

Apple publishes no record of which apps are unavailable in which of its App Stores. For the removals it makes on a government's demand it publishes the agency and the law behind every one — 2,045 of the 166,899 apps it removed during 2025 — and never which app. Where a reason reaches the public at all, it is usually because a developer chose to say so. Apple's App Store Transparency Report

Know of a statement, notice or order we have missed? Tell us →

Collision of math connoisseurs

Developer: Vladimir Krivenko · Category: Entertainment · Released: Jul 3, 2019 · Rating: 5.0★

View in App Store ↗
0stores where available
100stores where blocked
3.98Bpeople behind the block
100of 175 stores tested
575tests on record

Other Entertainment apps missing from mainland China

Everything missing from mainland China →

Life of this app

  1. Jul 3, 2019Released on the App Store
  2. Oct 25, 2019First tested by AppleCensorship
  3. Oct 25, 2019Last seen available anywhere
  4. Feb 14, 2022Gone from 100 storefronts
  5. Aug 5, 2026Most recent test

Testing history

One column per month, every month from the first reading to the last. Height follows how many readings we took that month; red is the share of them that found the app unavailable. An empty month is one nobody tested.

2019-102026-08

Found availableFound unavailable

Availability by storefront

Every storefront we test, current status first. Data is a measurement, not a promise: each row carries its own date.

Test now
AlbaniaALUnavailableApr 21, 20242 years ago
AlgeriaDZUnavailableMay 14, 20202 years ago
AustriaATUnavailableOct 12, 20203 years ago
AzerbaijanAZUnavailableOct 20, 20213 years ago
BelgiumBEUnavailableDec 1, 20233 years ago
BelizeBZUnavailableSep 29, 20233 years ago
BeninBJUnavailableSep 14, 20224 years ago
BermudaBMUnavailableNov 28, 20205 months ago
BhutanBTUnavailableNov 8, 20213 years ago
BotswanaBWUnavailableMay 14, 20204 years ago
BrazilBRUnavailableApr 19, 20222 years ago
British Virgin IslandsVGUnavailableDec 3, 20202 years ago
BruneiBNUnavailableMar 12, 20213 years ago
CambodiaKHUnavailableSep 18, 20232 years ago
CanadaCAUnavailableApr 16, 20214 years ago
Cape VerdeCVUnavailableFeb 14, 20223 years ago
Cayman IslandsKYUnavailableSep 22, 20242 years ago
ChadTDUnavailableApr 10, 20222 years ago
ChileCLUnavailableApr 6, 20214 years ago
China (Mainland)CNUnavailableJan 8, 20205 months ago
Costa RicaCRUnavailableDec 4, 20202 years ago
Côte d’IvoireCIUnavailableOct 26, 202511 months ago
CroatiaHRUnavailableJun 30, 20242 years ago
DominicaDMUnavailableDec 3, 20202 years ago
DR CongoCDUnavailableAug 21, 20224 years ago
EgyptEGUnavailableDec 18, 20233 years ago
El SalvadorSVUnavailableJun 30, 20242 years ago
EstoniaEEUnavailableNov 29, 20212 years ago
FijiFJUnavailableMar 15, 20243 years ago
FinlandFIUnavailableJan 8, 20202 years ago
GabonGAUnavailableSep 29, 20224 years ago
GambiaGMUnavailableFeb 14, 20223 years ago
GrenadaGDUnavailableAug 19, 20233 years ago
Guinea-BissauGWUnavailableDec 5, 20224 years ago
Hong KongHKUnavailableJan 3, 20222 years ago
HungaryHUUnavailableApr 4, 20234 years ago
IndonesiaIDUnavailableApr 7, 20222 years ago
IrelandIEUnavailableAug 12, 20224 years ago
IsraelILUnavailableOct 9, 20203 years ago
JapanJPUnavailableJan 16, 20223 years ago
KazakhstanKZUnavailableMar 6, 20267 months ago
KenyaKEUnavailableApr 24, 20222 years ago
KuwaitKWUnavailableNov 29, 20213 years ago
LaosLAUnavailableNov 9, 20212 years ago
LatviaLVUnavailableMar 20, 20212 years ago
LiberiaLRUnavailableMay 10, 20233 years ago
LibyaLYUnavailableJul 15, 20263 months ago
LuxembourgLUUnavailableApr 10, 20224 years ago
MalaysiaMYUnavailableFeb 13, 20223 years ago
MaliMLUnavailableNov 8, 20213 years ago
MaltaMTUnavailableJul 26, 20232 years ago
MauritiusMUUnavailableAug 14, 20214 years ago
MicronesiaFMUnavailableJun 22, 20224 years ago
MongoliaMNUnavailableMar 3, 20222 years ago
MontenegroMEUnavailableJan 10, 20243 years ago
MontserratMSUnavailableAug 22, 20233 years ago
MoroccoMAUnavailableAug 12, 20221 year ago
MozambiqueMZUnavailableApr 6, 20214 years ago
NauruNRUnavailableJun 30, 20242 months ago
NepalNPUnavailableDec 5, 20222 years ago
NetherlandsNLUnavailableSep 26, 20233 years ago
NicaraguaNIUnavailableApr 7, 20222 years ago
NigerNEUnavailableJun 26, 202111 months ago
NigeriaNGUnavailableMar 23, 20222 years ago
OmanOMUnavailableJul 15, 20233 years ago
PalauPWUnavailableDec 3, 20202 years ago
PanamaPAUnavailableJan 28, 202214 months ago
Papua New GuineaPGUnavailableMar 24, 20222 years ago
QatarQAUnavailableApr 7, 20222 years ago
Republic of the CongoCGUnavailableMar 20, 20213 years ago
RomaniaROUnavailableMar 23, 20222 years ago
RussiaRUUnavailableMar 3, 20222 years ago
RwandaRWUnavailableAug 1, 20224 years ago
São Tomé & PríncipeSTUnavailableJun 26, 20214 years ago
Saudi ArabiaSAUnavailableNov 26, 20202 years ago
Sierra LeoneSLUnavailableNov 9, 20212 years ago
SlovakiaSKUnavailableDec 11, 20202 years ago
SloveniaSIUnavailableDec 20, 20202 years ago
Solomon IslandsSBUnavailableJan 6, 20242 months ago
South KoreaKRUnavailableMar 12, 20214 years ago
Sri LankaLKUnavailableFeb 13, 20222 years ago
St. LuciaLCUnavailableApr 16, 20213 years ago
St. Vincent & GrenadinesVCUnavailableJul 7, 20212 years ago
SurinameSRUnavailableMar 13, 20243 years ago
SwitzerlandCHUnavailableJan 8, 20202 years ago
TajikistanTJUnavailableJan 16, 20223 years ago
TanzaniaTZUnavailableAug 30, 20214 years ago
TongaTOUnavailableJun 22, 20224 years ago
Trinidad & TobagoTTUnavailableMay 11, 20222 years ago
TunisiaTNUnavailableOct 27, 20202 years ago
TürkiyeTRUnavailableJan 6, 20229 months ago
TurkmenistanTMUnavailableMay 28, 20242 years ago
Turks & Caicos IslandsTCUnavailableJan 6, 20223 years ago
UgandaUGUnavailableOct 27, 20204 years ago
UkraineUAUnavailableMar 3, 20222 years ago
United Arab EmiratesAEUnavailableDec 20, 20202 months ago
United StatesUSUnavailableJan 8, 20202 months ago
UruguayUYUnavailableDec 7, 20202 years ago
VenezuelaVEUnavailableNov 4, 20242 years ago
ZimbabweZWUnavailableOct 9, 20203 years ago
AfghanistanAFNot tested——0
AngolaAONot tested——0
AnguillaAINot tested——0
Antigua & BarbudaAGNot tested——0
ArgentinaARNot tested——0
ArmeniaAMNot tested——0
AustraliaAUNot tested——0
BahamasBSNot tested——0
BahrainBHNot tested——0
BarbadosBBNot tested——0
BelarusBYNot tested——0
BoliviaBONot tested——0
Bosnia & HerzegovinaBANot tested——0
BulgariaBGNot tested——0
Burkina FasoBFNot tested——0
CameroonCMNot tested——0
ColombiaCONot tested——0
CyprusCYNot tested——0
CzechiaCZNot tested——0
DenmarkDKNot tested——0
Dominican RepublicDONot tested——0
EcuadorECNot tested——0
EswatiniSZNot tested——0
FranceFRNot tested——0
GeorgiaGENot tested——0
GermanyDENot tested——0
GhanaGHNot tested——0
GreeceGRNot tested——0
GuatemalaGTNot tested——0
GuyanaGYNot tested——0
HondurasHNNot tested——0
IcelandISNot tested——0
IndiaINNot tested——0
IraqIQNot tested——0
ItalyITNot tested——0
JamaicaJMNot tested——0
JordanJONot tested——0
KosovoXKNot tested——0
KyrgyzstanKGNot tested——0
LebanonLBNot tested——0
LithuaniaLTNot tested——0
MacaoMONot tested——0
MadagascarMGNot tested——0
MalawiMWNot tested——0
MaldivesMVNot tested——0
MauritaniaMRNot tested——0
MexicoMXNot tested——0
MoldovaMDNot tested——0
Myanmar (Burma)MMNot tested——0
NamibiaNANot tested——0
New ZealandNZNot tested——0
North MacedoniaMKNot tested——0
NorwayNONot tested——0
PakistanPKNot tested——0
ParaguayPYNot tested——0
PeruPENot tested——0
PhilippinesPHNot tested——0
PolandPLNot tested——0
PortugalPTNot tested——0
SenegalSNNot tested——0
SerbiaRSNot tested——0
SeychellesSCNot tested——0
SingaporeSGNot tested——0
South AfricaZANot tested——0
SpainESNot tested——0
St. Kitts & NevisKNNot tested——0
SwedenSENot tested——0
TaiwanTWNot tested——0
ThailandTHNot tested——0
United KingdomGBNot tested——0
UzbekistanUZNot tested——0
VanuatuVUNot tested——0
VietnamVNNot tested——0
YemenYENot tested——0
ZambiaZMNot tested——0

Testing asks Apple whether it will sell this app in that storefront, right now, by the same method the crawler has used since 2019. Your browser asks Apple directly, so the answer describes what Apple serves your connection — and if your browser cannot reach Apple at all, we ask on your behalf and say so. The result is a link: open it to see Apple's own answer and check ours. Readings are added to the record above; roughly a quarter of the readings taken each day come from people testing.

How we test

Availability is checked against Apple's own catalog servers for every storefront, the same way the App Store app asks. "Unavailable" means Apple's servers say the app cannot be offered in that country — it does not say who asked for the removal. Removals initiated by the developer and removals demanded by governments look the same from outside; the history and context on this page are how we tell them apart.