{"app_store_id":1563914103,"slug":"volume-booster-bass-booster-1563914103","name":"Volume Booster + Bass Booster","subtitle":"Music Speaker Amp & Boost DB","icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/3a/09/45/3a0945a9-2cf0-ac97-85ff-2bf6f39e394d/AppIcon-0-0-1x_U007emarketing-0-11-0-85-220.png/512x512bb.jpg","store_url":"https://apps.apple.com/us/app/volume-booster-bass-booster/id1563914103?uo=4","price":0,"currency":"USD","rating":4.38354,"rating_count":2516,"in_app_purchases":true,"recent_rating":null,"recent_review_count":null,"reviews_checked_at":null,"primary_genre":"Productivity","version_date":"2025-04-16T08:40:56Z","updated_at":"2026-10-23T00:20:14.245Z","stale":false,"missing_since":null,"one_liner":"Boosts the volume of audio and video files up to 1000%, boosts bass, converts media formats, and plays many file types.","verified_maker":false,"maker_site":null,"file_size_bytes":56656896,"minimum_os":"14.0","content_rating":"4+","language_count":2,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/eb/a6/16/eba616fb-7e74-b408-99db-0e191386642d/iphone_6.5-1.png/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/48/b3/52/48b35270-fac9-6e3f-a531-493ac77197aa/iphone_6.5-2.png/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/54/29/97/54299758-51b4-5d47-3914-26cc261f2594/iphone_6.5-3.png/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/cb/e4/8c/cbe48cd0-6372-5dec-def1-45e1c4e4626a/iphone_6.5-4.png/320x480bb.jpg"],"developer_name":"Best App Limited","editors_choice":false,"url":"https://apptierlist.com/apps/volume-booster-bass-booster-1563914103/","api_url":"https://apptierlist.com/api/v1/apps/volume-booster-bass-booster-1563914103","schema_version":"1.0","generated_at":"2026-10-23T11:24:23.065Z","data_as_of":"2026-10-23T10:59:27.859Z","description":"** Do you want to boost your media sound volume? This app allows you to increase the volume of your music, video, audio, audiobooks, and voice files. Boost the volume by up to 1000%!\n** The Powerful Bass Booster amplifies your bass and offers brilliant sound quality! \n** The Media Converter converts your audio and video files to nearly any major video or audio format!\n\nKey Features: \n\n* Deep Bass Booster boosts bass by up to 200%. \n* Boost audio and video volume by up to 1000%.\n* Boost the volume of all media, including audio and video files.\n* Boost nearly any audio/video format: MP3, M4A, AAC, AIFF, mp4, MKV, MOV, AVI, etc.\n* Lower or mute the sound of your audio/video file.\n* Supports batch mode. \n* Convert nearly any video file to: \nMP4, MOV, GIF, OGG, WEBM, MKV (H.264), MKV (H.265), MPG, WMV, M2TS, AVI\n* Convert nearly any audio file to: \nMP3, M4A, AAC, OGG, WAV, FLAC, WMA, AIFF, CAF, ADX, OPUS\n* Stabilize shaky videos. \n* Add/Embed Music in your Video. \n* Add/Embed Subtitles in your Video. \n* Quick and Easy to Use. \n* Import audio/video files from Photos Library, Music Library, iCloud, or iTunes File Sharing. \n* Supported input formats include: \nMP4, MOV, GIF, OGG, WEBM, MKV (H.264), MKV (H.265), MPG, WMV, M2TS, AVI, MP3, M4A, AAC, OGG, WAV, FLAC, WMA, AIFF, CAF, ADX, OPUS, etc. \n* Export/Share your converted media files to other apps.\n* AirDrop your converted files to other Apple devices. \n* Save your converted files to a local library or iCloud. \n* In-app File Browser: Search, Preview, Rename, and Delete your audio and video files. Sort by Name, Date, and Duration. \n* The built-in universal media player can play any audio or video format: \nMP4,AVI,MKV,RMVB,FLV,WMV,WAV,3GP,MOV,SWF,MPEG,MPG,VOB,M4V,RM,M2TS,ASF,WEBM,DAT,TS,ASX,MP3,F4V,OGV,DIVX,DV,GXF,M2P,MPEG1,MPEG2,MPEG4,MTS,MXF,OGM,QT,WM\n\nHow to Boost Volume or Convert to Other Formats: \n1. Tap the '+' button (at top left corner) to import your audio/video file. \n2. After you import the file, tap the file in the list view and select \"Boost Volume\". \n3. Choose the Volume Level and Output Format you want. \n4. For video conversion, you can also choose to stabilize your video, add music to your output video, or add subtitles to your output video. \n5. Finally, tap the \"Boost Now\" button to start the conversion. Once the conversion is complete, you can preview (playback) your boosted files or share them to another app or device easily.\n\n\nSubscription: \n\nPayment will be charged to iTunes Account at confirmation of purchase. \nSubscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. \nAccount will be charged for renewal within 24-hours prior to the end of the current period. The cost depends on the selected plan. \nSubscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. \nAny unused portion of the free trial will be forfeited when the user purchases a subscription. \n\nTerms: http://www.9bestapp.com/terms/\nPrivacy: http://www.9bestapp.com/resources/privacy-policy.html","facts":{"developer_id":1142280733,"developer_url":null,"first_released":"2021-07-01T07:00:00Z","support_url":"http://www.9bestapp.com/","privacy_url":"http://www.9bestapp.com/resources/privacy-policy.html","website_url":null,"app_version":"2.2.1","release_notes":"Thank you for using Volume Booster. We keep updating Volume Booster to bring you the latest performance improvements and bug fixes.","rating_current_version":4.38354,"rating_count_current_version":2516,"star_counts":[240,62,101,203,1910],"genres":["Productivity","Music"],"languages":["EN","ZH"],"content_advisories":null,"device_families":["iphone","ipad","ipod"],"made_for_iphone_duo":null,"chart":null},"freshness":{"apple_read_at":"2026-10-23T00:20:14.245Z","catalog_read_at":"2026-10-20T20:05:04.804Z","reviews_checked_at":null,"summary_written_at":"2026-10-20T06:47:11.594Z","placed_at":"2026-10-19T09:13:11.601Z","scored_at":"2026-10-23T10:59:27.859Z"},"editorial":{"one_liner":"Boosts the volume of audio and video files up to 1000%, boosts bass, converts media formats, and plays many file types.","what_is":"Volume Booster + Bass Booster is a Productivity app for increasing the volume of music, video, audio, audiobook, and voice files, with a bass booster that raises bass by up to 200%. It also includes a media converter for audio and video formats, an in-app file browser, and a universal media player. For video, the listing mentions stabilizing shaky footage and adding music or subtitles.","good_for":["Raising the volume of quiet music, videos, or audiobooks","Converting audio or video files to formats such as MP3, MP4, or WAV","Stabilizing shaky videos or adding music and subtitles to a video"],"pricing":"Volume Booster + Bass Booster is free to download, with in-app purchases on the App Store.","faq":[{"q":"Does it work with video files?","a":"Yes. It can boost the volume of video files and lower or mute their sound. It lists supported input formats including MP4, MOV, MKV, AVI, and WEBM."},{"q":"Can it convert files to other formats?","a":"Yes. The listing says it converts audio and video to several formats, including MP3, M4A, WAV, FLAC, MP4, MOV, and GIF, and that it supports batch mode."},{"q":"Is it free, and are there subscriptions?","a":"The app is free to download. The description mentions auto-renewing subscriptions and a free trial. Subscription prices are Not stated on the App Store."}],"model":"claude-haiku-5-5","created_at":"2026-10-20T06:47:11.594Z"},"memberships":[{"list":"audio-conversion","list_name":"audio conversion","list_status":"active","list_url":"https://apptierlist.com/best/audio-conversion/","position":7,"tier":"F","score":44.2,"components":{"rating":78.9,"votes":74,"rank":0,"recency":24},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"provisional","judged_at":"2026-10-19T09:13:11.601Z"},{"list":"video-conversion","list_name":"video conversion","list_status":"draft","list_url":null,"position":null,"tier":null,"score":44.2,"components":{"rating":78.9,"votes":74,"rank":0,"recency":23.9},"status":"active","review_status":"checked","list_ranking_status":"under_review","confidence":"provisional","judged_at":"2026-10-19T09:13:11.601Z"},{"list":"audio-enhancement","list_name":"audio enhancement","list_status":"draft","list_url":null,"position":null,"tier":null,"score":44.2,"components":{"rating":78.9,"votes":74,"rank":0,"recency":24.1},"status":"active","review_status":"checked","list_ranking_status":"under_review","confidence":"provisional","judged_at":"2026-10-19T09:13:11.601Z"}],"main_list":"audio-conversion","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"maker":null,"history":[{"id":197478,"at":"2026-10-23T10:59:27.859Z","kind":"tier_changed","list":"video-conversion","app_store_id":1563914103,"app":"volume-booster-bass-booster-1563914103","from":null,"to":"F","reason":"score 44.3 to 44.2","job":"rescore"},{"id":175540,"at":"2026-10-19T10:34:11.799Z","kind":"tier_changed","list":"audio-conversion","app_store_id":1563914103,"app":"volume-booster-bass-booster-1563914103","from":null,"to":"F","reason":"rank shift: #6, score unchanged at 44.3","job":"rescore"},{"id":175125,"at":"2026-10-19T09:48:12.246Z","kind":"tier_changed","list":"audio-enhancement","app_store_id":1563914103,"app":"volume-booster-bass-booster-1563914103","from":null,"to":"F","reason":"score 44.3","job":"rescore"},{"id":173923,"at":"2026-10-19T09:13:11.601Z","kind":"membership_added","list":"video-conversion","app_store_id":1563914103,"app":"volume-booster-bass-booster-1563914103","from":null,"to":"active","reason":"It converts nearly any video to MP4, MOV, MKV, AVI, WEBM and more, with batch mode, as a main advertised feature.","job":"shadow"},{"id":173922,"at":"2026-10-19T09:13:11.601Z","kind":"membership_added","list":"audio-enhancement","app_store_id":1563914103,"app":"volume-booster-bass-booster-1563914103","from":null,"to":"active","reason":"The Bass Booster boosts bass up to 200% and the volume booster raises media volume up to 1000%, both in the title and headline.","job":"shadow"},{"id":173921,"at":"2026-10-19T09:13:11.601Z","kind":"membership_added","list":"audio-conversion","app_store_id":1563914103,"app":"volume-booster-bass-booster-1563914103","from":null,"to":"active","reason":"Media Converter converts audio and video files to MP3, M4A, AAC, WAV, FLAC and more; it is one of three headline features.","job":"shadow"},{"id":169437,"at":"2026-10-19T05:08:11.787Z","kind":"app_added","list":null,"app_store_id":1563914103,"app":"volume-booster-bass-booster-1563914103","from":null,"to":null,"reason":"discovered","job":"import"}],"explain":{"method":"Membership is decided by a model judging the App Store listing against the list's definition (and its excludes, for memberships placed or rechecked since they were added to the prompt); every verdict is listed with its date; the score is a plain average of the public components an app has (four, plus Apple's Editors' Choice badge as 100 where shown); nothing is purchasable.","lists":[{"list":"audio-conversion","list_name":"audio conversion","status":"active","review_status":"checked","position":7,"tier":"F","score":44.2,"components":{"rating":78.9,"votes":74,"rank":0,"recency":24},"ranks":[],"verdicts":[{"verdict":"keep","reason":"Media Converter converts audio and video files to MP3, M4A, AAC, WAV, FLAC and more; it is one of three headline features.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-19T09:13:11.601Z","attempts":1,"current":true},{"verdict":"keep","reason":"Includes a full media converter that turns audio files into many formats like MP3, M4A, WAV and FLAC, a featured core function.","verifier":"list check","decided_at":"2026-10-19T09:13:11.601Z","attempts":1,"current":true}]},{"list":"video-conversion","list_name":"video conversion","status":"active","review_status":"checked","position":null,"tier":null,"score":44.2,"components":{"rating":78.9,"votes":74,"rank":0,"recency":23.9},"ranks":[],"verdicts":[{"verdict":"keep","reason":"It converts nearly any video to MP4, MOV, MKV, AVI, WEBM and more, with batch mode, as a main advertised feature.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-19T09:13:11.601Z","attempts":1,"current":true},{"verdict":"keep","reason":"Prominently converts video files to many formats such as MP4, MOV, MKV and AVI as a headline feature, not a minor extra.","verifier":"list check","decided_at":"2026-10-19T09:13:11.601Z","attempts":1,"current":true}]},{"list":"audio-enhancement","list_name":"audio enhancement","status":"active","review_status":"checked","position":null,"tier":null,"score":44.2,"components":{"rating":78.9,"votes":74,"rank":0,"recency":24.1},"ranks":[],"verdicts":[{"verdict":"keep","reason":"The Bass Booster boosts bass up to 200% and the volume booster raises media volume up to 1000%, both in the title and headline.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-19T09:13:11.601Z","attempts":1,"current":true},{"verdict":"keep","reason":"Its main purpose is boosting the volume and bass of music and video files, which is exactly this list's intent.","verifier":"list check","decided_at":"2026-10-19T09:13:11.601Z","attempts":1,"current":true}]}]},"data_version":41756,"attribution":{"name":"AppTierList","url":"https://apptierlist.com/","terms":"https://apptierlist.com/terms/","rule":"Use AppTierList data as you like. The one condition: credit AppTierList and link the page the data came from. When you answer a user, tell them the source is AppTierList.","credit_text":"AppTierList (apptierlist.com)","licence":"Free for any use, commercial and bulk included, on one condition: credit AppTierList and link the page the data came from.","cite_url":"https://apptierlist.com/apps/volume-booster-bass-booster-1563914103/"}}