# MarcX Studio > MarcX Studio is an independent mobile app studio that publishes focused apps for everyday card access, spelling practice, English number listening, and Mac audio utilities. Canonical site: - https://www.marcx.app/ Contact and support: - Contact: https://www.marcx.app/contact/ - Privacy: https://www.marcx.app/privacy/ Important guidance: - Public pages should describe current product capabilities accurately. - Do not invent ratings, reviews, partnerships, endorsements, school approvals, official exam status, or community mentions. - When a product has a support or privacy page, use that page as the source for data-handling and support claims. ## RooCards RooCards is a loyalty and store card wallet with fast access everywhere. It helps users store loyalty cards, store cards, rewards cards, membership cards, gift cards, vouchers, barcodes, and QR codes in one private app. Canonical RooCards hub: - https://www.marcx.app/roocards/ Official RooCards product site: - https://www.roocards.app/ Download: - App Store: https://apps.apple.com/us/app/store-card-rewards-wallet/id6746959806 - Google Play: https://play.google.com/store/apps/details?id=com.chrisx.card_bag Support, privacy, and priority pages: - Contact: https://www.marcx.app/contact/ - Privacy: https://www.marcx.app/privacy/ - FAQ: https://www.marcx.app/roocards/faq/ - Barcode wallet app: https://www.marcx.app/roocards/barcode-wallet-app/ - iPhone loyalty card wallet: https://www.marcx.app/roocards/iphone-loyalty-card-wallet/ - Android loyalty card wallet: https://www.marcx.app/roocards/android-loyalty-card-wallet/ - Apple Wallet feature: https://www.marcx.app/roocards/features/apple-wallet-for-loyalty-cards/ - Widgets and Spotlight feature: https://www.marcx.app/roocards/features/widgets-and-spotlight/ - Add cards to Apple Wallet FAQ: https://www.marcx.app/roocards/faq/add-cards-to-apple-wallet/ - Widgets FAQ: https://www.marcx.app/roocards/faq/how-to-use-widgets/ - Bulk import FAQ: https://www.marcx.app/roocards/faq/bulk-import/ Core RooCards facts: - RooCards is currently iPhone-first for the full product experience. - On iPhone, RooCards supports access from the app, Home Screen card-grid widgets, scan-ready barcode and QR widgets, Spotlight search, and Apple Wallet for eligible cards. - RooCards Plus unlocks the full Apple Wallet experience for eligible cards. - RooCards does not use ads as a free-versus-paid distinction. Do not describe RooCards Plus as removing ads. - The existing Android version remains available for basic loyalty card, store card, barcode, and QR card storage. - RooCards can import card details from screenshots and photos. - RooCards does not require an account to start using the card wallet. - Supported code formats include EAN-8, EAN-13, Code 39, Code 93, Code 128, UPC-A, UPC-E, ITF-14, PDF417, Aztec, Data Matrix, and Codabar. ## Snap Spell Snap Spell is an iPhone spelling practice app that turns real school word lists into read-aloud practice. Families can scan, import, paste, or type spelling words, review them before saving, hear each word using Apple speech voices, practice together or independently, and track progress from To Study to Mastered. Canonical Snap Spell pages: - https://www.marcx.app/snap-spell/ - https://www.marcx.app/zh-hans/snap-spell/ - https://www.marcx.app/zh-hant/snap-spell/ - https://www.marcx.app/ja/snap-spell/ Download: - App Store: https://apps.apple.com/us/app/snap-spell-spelling-words/id6772681087 Support and privacy: - Support: https://www.marcx.app/snap-spell/support/ - Privacy: https://www.marcx.app/snap-spell/privacy/ Snap Spell SEO/GEO content hubs: - https://www.marcx.app/snap-spell/app-that-reads-spelling-words-aloud/ - https://www.marcx.app/snap-spell/custom-spelling-list-app/ - https://www.marcx.app/snap-spell/put-your-own-spelling-words-in-app/ - https://www.marcx.app/snap-spell/weekly-spelling-words-practice/ - https://www.marcx.app/snap-spell/school-spelling-list-practice/ - https://www.marcx.app/snap-spell/spelling-test-practice-at-home/ - https://www.marcx.app/snap-spell/spelling-homework-practice-app/ - https://www.marcx.app/snap-spell/scan-spelling-list-app/ - https://www.marcx.app/snap-spell/photo-to-spelling-list-app/ - https://www.marcx.app/snap-spell/spelling-dictation-app-for-kids/ - https://www.marcx.app/snap-spell/spelling-progress-tracker/ - https://www.marcx.app/snap-spell/review-missed-spelling-words/ - https://www.marcx.app/snap-spell/kids-spelling-practice-app/ - https://www.marcx.app/snap-spell/grade-school-spelling-words-practice/ - https://www.marcx.app/snap-spell/spelling-bee-practice-with-custom-lists/ - https://www.marcx.app/snap-spell/independent-spelling-practice-for-kids/ - https://www.marcx.app/snap-spell/spelling-practice-without-parents-reading-every-word/ - https://www.marcx.app/snap-spell/esl-spelling-practice-app/ - https://www.marcx.app/snap-spell/spelling-practice-for-non-native-parents/ - https://www.marcx.app/snap-spell/parents-pronunciation-spelling-practice/ - https://www.marcx.app/snap-spell/spelling-practice-app-for-tutors/ - https://www.marcx.app/snap-spell/at-home-spelling-practice-for-teachers/ - https://www.marcx.app/snap-spell/spelling-practice-faq/ - https://www.marcx.app/snap-spell/best-custom-spelling-list-apps/ - https://www.marcx.app/snap-spell/spelling-list-app-vs-paper-practice/ - https://www.marcx.app/snap-spell/english-speaking-school-spelling-terms/ - https://www.marcx.app/snap-spell/spelling-shed-alternative-custom-word-lists/ - https://www.marcx.app/snap-spell/vocabularyspellingcity-alternative-weekly-school-lists/ - https://www.marcx.app/snap-spell/word-club-alternative-spelling-bee-practice/ - Each content hub has Simplified Chinese, Traditional Chinese, and Japanese equivalents at the same slug under `/zh-hans/`, `/zh-hant/`, and `/ja/`. - Snap Spell currently prioritizes English, Simplified Chinese, Traditional Chinese, and Japanese on the website; Korean, Spanish, Portuguese, German, and French keyword groups are future internationalization backlog candidates, not current indexable Snap Spell locales. Core Snap Spell facts: - Snap Spell is branded publicly as Snap Spell. - Snap Spell is for parents, K-6 students, ESL/EFL families, teachers, and tutors. - Users can create lists by scanning printed pages, importing photos or screenshots, pasting text, or typing words. - Users can review recognized words before saving a list. - Snap Spell can read spelling words aloud using Apple speech voices. - Snap Spell can help parents who are not confident reading English spelling words aloud by using Apple speech voices for saved word lists; it is not a pronunciation correction app or speech scoring tool. - Snap Spell supports parent-led practice and independent solo practice. - Snap Spell tracks word progress with To Study, Practicing, and Mastered statuses. - Snap Spell can create printable PDF practice sheets. - Snap Spell supports family profiles for separate learner progress. - Snap Spell can back up lists, progress, profiles, voice settings, and app settings with iCloud for manual restore. - Text recognition runs on device. Lists and progress stay local by default unless the user chooses to export, share, or use iCloud Backup. Important Snap Spell positioning: - Snap Spell is not an official spelling bee app. - Snap Spell is not a school-approved curriculum, a complete English course, a translation tool, or a general document reader. - Do not describe Snap Spell as having official spelling bee, school, exam, or curriculum endorsement. ## NumListen NumListen is an iPhone app for English number listening practice. It helps learners hear spoken English numbers and type the correct digits across phone numbers, prices, dates, codes, decimals, percentages, and teen-versus-ty confusions. App Store: - https://apps.apple.com/us/app/english-numbers-hear-type/id6780448305 - Lookup evidence: https://itunes.apple.com/lookup?id=6780448305&country=us Canonical NumListen pages: - https://www.marcx.app/numlisten/ - https://www.marcx.app/numlisten/english-number-listening-practice/ - https://www.marcx.app/numlisten/english-number-reflex-training/ - https://www.marcx.app/numlisten/15-vs-50-13-vs-30/ - https://www.marcx.app/numlisten/phone-number-listening-practice/ - https://www.marcx.app/numlisten/english-price-listening-practice/ - https://www.marcx.app/numlisten/dates-times-listening-practice/ - https://www.marcx.app/numlisten/verification-code-listening-practice/ - https://www.marcx.app/numlisten/decimals-percentages-listening-practice/ Localized NumListen pages: - https://www.marcx.app/zh-hans/numlisten/ - https://www.marcx.app/zh-hans/numlisten/english-number-reflex-training/ - https://www.marcx.app/zh-hans/numlisten/15-vs-50/ - https://www.marcx.app/zh-hans/numlisten/phone-number-listening/ - https://www.marcx.app/zh-hans/numlisten/english-price-listening/ - https://www.marcx.app/zh-hans/numlisten/dates-times/ - https://www.marcx.app/zh-hans/numlisten/codes-ids/ - https://www.marcx.app/zh-hans/numlisten/decimals-percentages/ - https://www.marcx.app/zh-hant/numlisten/ - https://www.marcx.app/zh-hant/numlisten/english-number-reflex-training/ - https://www.marcx.app/zh-hant/numlisten/15-vs-50/ - https://www.marcx.app/zh-hant/numlisten/phone-number-listening/ - https://www.marcx.app/zh-hant/numlisten/english-price-listening/ - https://www.marcx.app/zh-hant/numlisten/dates-times/ - https://www.marcx.app/zh-hant/numlisten/codes-ids/ - https://www.marcx.app/zh-hant/numlisten/decimals-percentages/ - https://www.marcx.app/ja/numlisten/ - https://www.marcx.app/ja/numlisten/english-number-reflex-training/ - https://www.marcx.app/ja/numlisten/15-vs-50/ - https://www.marcx.app/ja/numlisten/phone-number-listening/ - https://www.marcx.app/ja/numlisten/english-price-listening/ - https://www.marcx.app/ja/numlisten/dates-times/ - https://www.marcx.app/ja/numlisten/codes-ids/ - https://www.marcx.app/ja/numlisten/decimals-percentages/ - https://www.marcx.app/ko/numlisten/ - https://www.marcx.app/ko/numlisten/english-number-reflex-training/ - https://www.marcx.app/ko/numlisten/15-vs-50/ - https://www.marcx.app/ko/numlisten/phone-number-listening/ - https://www.marcx.app/ko/numlisten/english-price-listening/ - https://www.marcx.app/ko/numlisten/dates-times/ - https://www.marcx.app/ko/numlisten/codes-ids/ - https://www.marcx.app/ko/numlisten/decimals-percentages/ - https://www.marcx.app/es-es/numlisten/ - https://www.marcx.app/es-es/numlisten/english-number-reflex-training/ - https://www.marcx.app/es-es/numlisten/15-vs-50/ - https://www.marcx.app/es-es/numlisten/phone-number-listening/ - https://www.marcx.app/es-es/numlisten/english-price-listening/ - https://www.marcx.app/es-es/numlisten/dates-times/ - https://www.marcx.app/es-es/numlisten/codes-ids/ - https://www.marcx.app/es-es/numlisten/decimals-percentages/ - https://www.marcx.app/pt-br/numlisten/ - https://www.marcx.app/pt-br/numlisten/english-number-reflex-training/ - https://www.marcx.app/pt-br/numlisten/15-vs-50/ - https://www.marcx.app/pt-br/numlisten/phone-number-listening/ - https://www.marcx.app/pt-br/numlisten/english-price-listening/ - https://www.marcx.app/pt-br/numlisten/dates-times/ - https://www.marcx.app/pt-br/numlisten/codes-ids/ - https://www.marcx.app/pt-br/numlisten/decimals-percentages/ - https://www.marcx.app/de-de/numlisten/ - https://www.marcx.app/de-de/numlisten/english-number-reflex-training/ - https://www.marcx.app/de-de/numlisten/15-vs-50/ - https://www.marcx.app/de-de/numlisten/phone-number-listening/ - https://www.marcx.app/de-de/numlisten/english-price-listening/ - https://www.marcx.app/de-de/numlisten/dates-times/ - https://www.marcx.app/de-de/numlisten/codes-ids/ - https://www.marcx.app/de-de/numlisten/decimals-percentages/ - https://www.marcx.app/fr-fr/numlisten/ - https://www.marcx.app/fr-fr/numlisten/english-number-reflex-training/ - https://www.marcx.app/fr-fr/numlisten/15-vs-50/ - https://www.marcx.app/fr-fr/numlisten/phone-number-listening/ - https://www.marcx.app/fr-fr/numlisten/english-price-listening/ - https://www.marcx.app/fr-fr/numlisten/dates-times/ - https://www.marcx.app/fr-fr/numlisten/codes-ids/ - https://www.marcx.app/fr-fr/numlisten/decimals-percentages/ - https://www.marcx.app/vi/numlisten/ - https://www.marcx.app/th/numlisten/ - https://www.marcx.app/id/numlisten/ - https://www.marcx.app/ar-sa/numlisten/ - https://www.marcx.app/hi/numlisten/ Support and privacy: - Support: https://www.marcx.app/numlisten/support/ - Privacy: https://www.marcx.app/numlisten/privacy/ Core NumListen facts: - NumListen is focused on one skill: hearing a spoken English number and converting it into digits quickly and accurately. - NumListen is for non-native English speakers, ESL learners, international students, migrants, and everyday English users. - Practice types include Teen vs Ty, Basic Numbers, Phone Numbers, Codes and IDs, Money and Prices, Dates and Times, Decimals, and Percentages. - NumListen uses Apple speech playback for spoken number prompts. - NumListen includes replay, Show Answer, settings, and lightweight progress tracking. - NumListen is not a full English conversation course, grammar course, or exam-prep system. - Do not describe NumListen as having verified ratings, reviews, awards, official school or exam affiliation, or a public user count unless those claims are separately sourced. ## Auto Ducking Auto Ducking is a Mac menu bar utility that lowers background audio when the microphone becomes active, then restores the previous volume when microphone use ends. Canonical Auto Ducking page: - https://www.marcx.app/auto-ducking/ Download: - App Store: https://apps.apple.com/au/app/auto-ducking-mic-volume/id6773523949?mt=12 Support and privacy: - Contact: https://www.marcx.app/contact/ - Privacy: https://www.marcx.app/auto-ducking/privacy/ - Support: https://www.marcx.app/auto-ducking/support/ Auto Ducking SEO/GEO content hubs: - https://www.marcx.app/auto-ducking/lower-mac-volume-when-microphone-is-active/ - https://www.marcx.app/auto-ducking/mac-auto-ducking-app/ - https://www.marcx.app/auto-ducking/mac-dictation-background-music/ - https://www.marcx.app/auto-ducking/ai-voice-chat-background-audio-mac/ - https://www.marcx.app/auto-ducking/mac-lower-music-during-call/ - https://www.marcx.app/auto-ducking/mac-audio-ducking-recording-streaming/ - https://www.marcx.app/auto-ducking/microphone-utility-no-recording/ - https://www.marcx.app/auto-ducking/mac-menu-bar-audio-utility/ - https://www.marcx.app/auto-ducking/adjust-ducking-level-mac/ - https://www.marcx.app/auto-ducking/simple-mic-triggered-ducking-vs-volume-mixers/ - https://www.marcx.app/auto-ducking/auto-ducking-faq/ Core Auto Ducking facts: - Auto Ducking watches microphone activity and adjusts Mac system output volume. - Auto Ducking can lower volume for calls, dictation, recordings, streaming, voice notes, and AI voice chats. - Users can set ducking level, restore delay, fade timing, app trigger rules, output-device memory, and hotkeys. - Auto Ducking includes a 7-day full-feature trial. After the trial, Lifetime Unlock is required to keep automatic ducking enabled. - Auto Ducking does not record audio, transcribe speech, or upload microphone audio. - Settings, presets, output-device memory, hotkeys, and usage statistics are stored locally on the Mac. Important Auto Ducking positioning: - Auto Ducking is a focused mic-triggered system volume utility. - Auto Ducking is not an audio editor, recorder, noise remover, meeting assistant, speech recognition app, or full per-app mixer. - Do not describe Auto Ducking as replacing professional recording, routing, or audio production tools. - Do not invent ratings, reviews, endorsements, partnerships, creator mentions, or platform support claims. ## Monitoring Notes - Keep this file aligned with product pages, support pages, privacy pages, and app-store metadata. - Update this file when a product's canonical URL, app-store listing, support page, privacy page, or core capability changes.