{"app_store_id":1328712601,"slug":"keytuner-1328712601","name":"KeyTuner","subtitle":null,"icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/f3/b4/ae/f3b4aec3-51a3-da71-1eef-d8eddf339795/TunerIcon-0-0-1x_U007emarketing-0-0-0-7-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/512x512bb.jpg","store_url":"https://apps.apple.com/us/app/keytuner/id1328712601?uo=4","price":0,"currency":"USD","rating":4.70719,"rating_count":1793,"in_app_purchases":null,"recent_rating":null,"recent_review_count":null,"reviews_checked_at":null,"primary_genre":"Music","version_date":"2021-04-12T17:37:08Z","updated_at":"2026-10-23T04:37:17.911Z","stale":false,"missing_since":null,"one_liner":"A free chromatic tuner for instruments from A0 to C8, with a horizontal meter, quick mode, tone generation and.","verified_maker":false,"maker_site":null,"file_size_bytes":15691776,"minimum_os":"12.0","content_rating":"4+","language_count":3,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/da/bc/db/dabcdb43-1f0d-2617-68ff-287b1c7c950b/pr_source.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/71/90/49/71904967-0a90-26c1-ee22-7845cde210ba/pr_source.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/98/b3/2a/98b32a2d-dd22-978d-e272-4356356407bc/pr_source.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/43/12/8d/43128d32-9942-8ef0-79a1-79380a8145ef/pr_source.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/ee/32/26/ee32269f-c6a3-c209-9fea-e122b5a608be/pr_source.png/392x696bb.png"],"developer_name":"TimperLabs LLC","editors_choice":null,"url":"https://apptierlist.com/apps/keytuner-1328712601/","api_url":"https://apptierlist.com/api/v1/apps/keytuner-1328712601","schema_version":"1.0","generated_at":"2026-10-23T09:25:59.576Z","data_as_of":"2026-10-23T09:08:13.566Z","description":"KeyTuner is a full-range accurate and easy to use chromatic tuner that gives clear feedback with a visual design that makes maximum use of the screen. A consistent horizontal display for fine and coarse tuning allows easy tracking of the needle as a note is played. The display is suitable for both tuning and intonation practice. Quick mode provides fast confirmation in live situations. Tone generation is also supported for droning.\n\nAn advanced digital algorithm is used to allow precise tuning of all instruments (strings, woodwinds, brass, plucked string, etc). Many tuners have difficulty with low registers or those with many overtones but KeyTuner employs algorithms specifically aware of harmonic distributions. By taking advantage of the real-time behavior of multiple waveforms, vibrato can be detected and is shown as a highlighted region around the needle.\n\nFeatures:\n- Accuracy of 0.1 cent (0.001 semitone)\n- Works with all instruments from A0 to C8\n- Large easy-to-read meter for fine tuning\n- Space efficient display for coarse tuning\n- Quick mode for easy adjustments\n- Color schemes: Light, Warm, Dark\n- 3 levels of needle dampening to control responsiveness\n- Temperament selection: Just, Equal-Tempered, Strings - Supports transposing instruments\n- Tone/drone generation\n- Concert Pitch (A4) calibration","facts":{"developer_id":1328180296,"developer_url":"https://www.timperlabs.com","first_released":"2018-02-19T22:01:17Z","support_url":null,"privacy_url":null,"website_url":null,"app_version":"2.1.1","release_notes":"Minor fixes","rating_current_version":4.70719,"rating_count_current_version":1793,"star_counts":null,"genres":["Music","Utilities"],"languages":["EN","JA","ZH"],"content_advisories":null,"device_families":null,"made_for_iphone_duo":null,"chart":null},"freshness":{"apple_read_at":"2026-10-23T04:37:17.911Z","catalog_read_at":null,"reviews_checked_at":null,"summary_written_at":"2026-10-23T07:50:13.059Z","placed_at":"2026-10-23T04:34:43.874Z","scored_at":"2026-10-23T09:08:13.566Z"},"editorial":{"one_liner":"A free chromatic tuner for instruments from A0 to C8, with a horizontal meter, quick mode, tone generation and.","what_is":"KeyTuner is a chromatic tuner for iOS that shows pitch on a horizontal needle display for fine and coarse tuning. It supports strings, woodwinds, brass and plucked string instruments, and includes a vibrato indicator, tone/drone generation and Concert Pitch (A4) calibration.","good_for":["Tuning strings, woodwinds, brass or plucked instruments","Intonation practice with a visible needle","Quick checks in live performance settings"],"pricing":"KeyTuner is free to download on the App Store.","faq":[{"q":"Is KeyTuner free?","a":"It is free to download. No in-app purchases are listed."},{"q":"Which instruments does it support?","a":"It works with all instruments from A0 to C8 and names strings, woodwinds, brass and plucked string instruments as examples."},{"q":"Does it generate reference tones?","a":"Yes. Tone and drone generation is supported, and that Concert Pitch (A4) calibration is included."}],"model":"claude-haiku-5-5","created_at":"2026-10-23T07:50:13.059Z"},"memberships":[{"list":"instrument-tuning","list_name":"instrument tuning","list_status":"active","list_url":"https://apptierlist.com/best/instrument-tuning/","position":22,"tier":"C","score":65.9,"components":{"rating":94.3,"votes":73.8,"rank":95.4,"recency":0},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"normal","judged_at":"2026-10-23T04:34:43.874Z"}],"main_list":"instrument-tuning","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"maker":null,"history":[{"id":195804,"at":"2026-10-23T04:35:15.821Z","kind":"tier_changed","list":"instrument-tuning","app_store_id":1328712601,"app":"keytuner-1328712601","from":null,"to":"C","reason":"score 65.9","job":"rescore"},{"id":195782,"at":"2026-10-23T04:34:43.874Z","kind":"membership_added","list":"instrument-tuning","app_store_id":1328712601,"app":"keytuner-1328712601","from":null,"to":"active","reason":"Chromatic tuner for all instruments A0 to C8 (strings, woodwinds, brass) with 0.1 cent accuracy, temperaments and transposing support.","job":"shadow"},{"id":182759,"at":"2026-10-20T02:56:11.526Z","kind":"app_added","list":null,"app_store_id":1328712601,"app":"keytuner-1328712601","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":"instrument-tuning","list_name":"instrument tuning","status":"active","review_status":"checked","position":22,"tier":"C","score":65.9,"components":{"rating":94.3,"votes":73.8,"rank":95.4,"recency":0},"ranks":[{"country":"us","rank":8},{"country":"gb","rank":3},{"country":"ca","rank":4},{"country":"au","rank":4},{"country":"de","rank":9}],"verdicts":[{"verdict":"keep","reason":"Chromatic tuner for all instruments A0 to C8 (strings, woodwinds, brass) with 0.1 cent accuracy, temperaments and transposing support.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-23T04:34:43.874Z","attempts":1,"current":true},{"verdict":"keep","reason":"Its main purpose is a chromatic tuner. It detects pitch for all instruments from A0 to C8 and shows a needle meter, so it is not limited to guitar and is not just a reference-tone app.","verifier":"list check","decided_at":"2026-10-23T04:34:43.874Z","attempts":1,"current":true}]}]},"data_version":41680,"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/keytuner-1328712601/"}}