{"app_store_id":325307477,"slug":"audiotools-db-sound-audio-325307477","name":"AudioTools, dB, Sound & Audio","subtitle":"RTA, Acoustics Measurement SPL","icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/75/1b/cb/751bcbc0-e8e1-9b95-5451-8c89f4feb0cc/AudioTools_Icons-0-0-1x_U007emarketing-0-8-0-85-220.png/512x512bb.jpg","store_url":"https://apps.apple.com/us/app/audiotools-db-sound-audio/id325307477?uo=4","price":19.99,"currency":"USD","rating":4.78348,"rating_count":5085,"in_app_purchases":true,"recent_rating":null,"recent_review_count":null,"reviews_checked_at":null,"primary_genre":"Music","version_date":"2026-10-15T14:46:10Z","updated_at":"2026-10-22T00:58:12.700Z","stale":false,"missing_since":null,"one_liner":"Suite of audio and acoustic analysis tools, including an SPL meter, RTA, FFT, speaker polarity test and recorder.","verified_maker":false,"maker_site":null,"file_size_bytes":100345856,"minimum_os":"15.0","content_rating":"4+","language_count":9,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/9c/f4/9c/9cf49cca-eb28-5c00-2768-7663ddd93e12/mzl.ubxhkmvf.png/406x228bb.png","https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/24/a8/e6/24a8e6e6-034c-bfd6-5d40-527ba234b882/mzl.ocsyxbyz.png/406x228bb.png","https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/57/50/a0/5750a04c-8ca7-7672-f741-adff9c884af7/mzl.ticetwyt.png/406x228bb.png","https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/93/c4/46/93c4464f-e363-63ef-2eea-2b64b1b44e94/mzl.clrrujkj.png/392x696bb.png"],"developer_name":"Andrew Smith","editors_choice":false,"url":"https://apptierlist.com/apps/audiotools-db-sound-audio-325307477/","api_url":"https://apptierlist.com/api/v1/apps/audiotools-db-sound-audio-325307477","schema_version":"1.0","generated_at":"2026-10-22T10:50:07.962Z","data_as_of":"2026-10-22T10:35:12.511Z","description":"AudioTools from Studio Six Digital is a suite of professional-grade audio and acoustic analysis apps. Included in the price of this app is a great collection of professional tools -- SPL, RTA, FFT, Speaker Polarity Test, Generator, Audio Scope, CLF Viewer, and Recorder, and the framework to add more powerful modules as you need them.\n\nCustomize AudioTools for your needs by buying any of the additional optional modules, like Smaart Tools I, SPL Graph, or Impulse Response, at any time right from your iOS device.\n\nWe test every iOS device and calibrate the microphone level and frequency response for the best results. We have the ability to turn off the Apple low frequency filters, and on many devices we can measure up to 120 dB SPL.\n\nAdd iTestMic, iPrecisionMic, or iAudioInterface2 for a complete professional audio and acoustic test and measurement platform.\n\nActual reviews:\n\n“...AudioTools is a “how did I ever live without it” app”.\n\n“I think this application is the best I EVER purchased.”\n\n“I have used many thousands of dollars of complicated test equipment that doesn’t measure up to this app suite.”\n\n***** Included in the app price *****\n\n* SPL Meter\nA faithful reproduction of a classic analog SPL meter. Includes A and C weighting, and Fast and Slow ANSI decay modes. All filters meet or exceed ANSI type 1.\n\n* RTA\nA 1/3 and octave band Real Time Analyzer. Includes touch-GUI range control, a cursor, max/min bars, and noise curve overlays. \n\n* FFT\nDetailed acoustic analysis, up to 32876 points. View full detail or smooth to 1/24, 1/6, 1/3 or octave. Includes cursor, scalable graphics, and peak tracking.\n\n* Polarity\nSpeaker polarity checker. Route the test signal to a speaker, and read the polarity of the speaker on the screen.\n\n* CLF Viewer\nShow loudspeaker data, including plots for impedance, axial response, sensitivity, polar response, and 6dB coverage, and a 3D color balloon plot. \n\n* Delay Finder\nMeasures the time it takes for a pulse to return from a speaker. \n\n* Generator\nGenerates sine waves, square waves, white and pink noise.\n\n* Line Level Tests\nA line level measurement function and frequency counter.\n\n* Audio Scope\nA dual-channel audio oscilloscope that includes auto-triggering, variable gain and sweep rate, and storage of scope images.\n\n* Recorder\nA mono/stereo audio recorder with WAV and compressed formats and 8k-48k sample rate. Transfer files via WIFI.\n\n* File transfer of results via wifi to PC / Mac.\n\n* Audio Calculators\n\n***** Optional modules available for purchase from within AudioTools *****\n\n* SoundScope VR - FFT-based audio analyzer with VR.\nThe powerful acoustical analysis module. Includes RTA graphs to 1/48th octave and Spectrograph, and can display VR.\n\n* Transfer Function -- Requires 2-channel interface. \nTwo-channel FFT-based measurement. Allows you to analyze sound system performance with music or pink noise as the signal source.\n\n* ETC\nEnergy Time Curve. Plot decay of an impulse over time, and compute RT60 time. Internal or External trigger.\n\n* Impulse Response\nRecord and analyze an impulse or sine sweep, compute octave and 1/3 octave ETC, T30, C50, C80, CT, Definition.\n\n* LARSA\nFast and accurate sine-sweep measurement of loudspeakers and rooms.\n\n* SPL Pro\nDigital SPL meter with ANSI Slow, Fast, Peak, and Impulse mode, along with LEQ. Includes A and C weighting, and all 10 octave band filters.\n\n* SPL Graph\nPlot second-by-second SPL level for up to 24 hours, and optionally record the audio. Also, add the optional Octave Band Logging upgrade to elevate this tool to rival any professional logging SPL Meter.\n\n* SPL Traffic Light\nMonitor live sound levels SPL and Leq and see status in a simple green-yellow-red display.\n\n* STIPA Speech Intelligibility\nMeets the current NFPA code standards for testing evac systems and schools.\n\n* Speaker Distortion\nMeasure THD+n of any driver.\n\n* THD+n (requires iAudioInterface)\n\n* Impedance Meter and Plot (requires iAudioInterface)\n\n* Phase Meter\n\n* Amplitude Sweep","facts":{"developer_id":291822462,"developer_url":"https://www.studiosixdigital.com","first_released":"2009-09-08T21:04:44Z","support_url":"https://studiosixdigital.com/support/audiotools_faq.html","privacy_url":"http://www.studiosixdigital.com/privacy-policy","website_url":"https://www.studiosixdigital.com/","app_version":"18.14","release_notes":"AudioTools, #1 audio test and measurement app\nNew in this release:\n- Ready for iPhone Duo: every screen adapts to closed, open, book and tent, with controls in the side strip.\n- Window-size aware: layouts follow the window, including iPhone Mirroring on macOS 27.\n- iOS 26 appearance adopted.\n- SPL Dashboard: Stop works with auto-save off; meters stack when the screen is tall.\n- SPL Pro: labels no longer creep after a fold; weighting menu is right way up on a flipped screen.\n- SPL Meter: landscape layout restored.\n- Scope: the generator panel no longer appears twice.\n- LUFS, Channel Mapper, STIPA, Thiele/Small, Impedance, Recorder: layout fixes for small and odd-shaped screens.\n- Low SPL: short band titles on narrow screens.\n- LARSA: auto trigger level when the sweep plays on Hyperion, SurroundPod or Apple TV; sub timing from the envelope; Magnitude and Phase no longer blank with an external mic and no comp file.\n- Calibration: iPad (A16) added to the device table.\n- HAA Link: filter panel crash fixed; miniDSP 2x4 HD supported as a processor.\n- CinemaTools: Sub Alignment, Signal Generator, project backups and many fixes.","rating_current_version":4.78348,"rating_count_current_version":5085,"star_counts":[91,42,88,435,4429],"genres":["Music","Utilities"],"languages":["EN","FR","DE","JA","PL","ZH","ES","SV","ZH"],"content_advisories":null,"device_families":["iphone","ipad","ipod"],"chart":{"name":"top-paid Music","position":39}},"freshness":{"apple_read_at":"2026-10-22T00:58:12.700Z","catalog_read_at":"2026-10-22T00:58:12.700Z","reviews_checked_at":null,"summary_written_at":"2026-10-20T06:40:11.809Z","placed_at":"2026-10-18T01:56:11.606Z","scored_at":"2026-10-22T10:35:12.511Z"},"editorial":{"one_liner":"Suite of audio and acoustic analysis tools, including an SPL meter, RTA, FFT, speaker polarity test and recorder.","what_is":"AudioTools from Studio Six Digital is a suite of audio and acoustic analysis apps. The included tools are an SPL meter, RTA, FFT, polarity check, loudspeaker data viewer, delay finder, signal generator, line level tests, audio scope and recorder. Optional modules can be purchased from within the app.","good_for":["Measuring sound pressure level with an SPL meter","Checking speaker polarity with a test signal","Viewing frequency content with RTA or FFT analysis"],"pricing":"AudioTools, dB, Sound & Audio is $19.99 to download, with in-app purchases on the App Store.","faq":[{"q":"Can it record audio and move results to a computer?","a":"The Recorder supports mono or stereo audio in WAV and compressed formats at sample rates from 8k to 48k. The description says results can be transferred via Wi-Fi to a PC or Mac."},{"q":"Does it need extra hardware?","a":"The description says adding iTestMic, iPrecisionMic or iAudioInterface2 creates a complete test and measurement platform. Transfer Function requires a 2-channel interface. Other hardware requirements are Not stated on the App Store."}],"model":"claude-haiku-5-5","created_at":"2026-10-20T06:40:11.809Z"},"memberships":[{"list":"audio-analysis","list_name":"audio analysis","list_status":"active","list_url":"https://apptierlist.com/best/audio-analysis/","position":2,"tier":"A","score":89.1,"components":{"rating":95.5,"votes":78,"rank":82.8,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"normal","judged_at":"2026-10-18T01:56:11.606Z"},{"list":"sound-measurement","list_name":"sound measurement","list_status":"draft","list_url":null,"position":null,"tier":null,"score":68.4,"components":{"rating":95.5,"votes":78,"rank":0,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"under_review","confidence":"provisional","judged_at":"2026-10-18T01:56:11.606Z"}],"main_list":"audio-analysis","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"history":[{"id":193593,"at":"2026-10-22T10:35:12.511Z","kind":"tier_changed","list":"sound-measurement","app_store_id":325307477,"app":"audiotools-db-sound-audio-325307477","from":null,"to":"C","reason":"rank shift: #8, score unchanged at 68.4","job":"rescore"},{"id":174691,"at":"2026-10-19T09:33:11.813Z","kind":"tier_changed","list":"audio-analysis","app_store_id":325307477,"app":"audiotools-db-sound-audio-325307477","from":null,"to":"A","reason":"list left review: 6 or more members checked, ranked #2","job":"rescore"},{"id":149744,"at":"2026-10-18T01:56:11.606Z","kind":"membership_added","list":"sound-measurement","app_store_id":325307477,"app":"audiotools-db-sound-audio-325307477","from":null,"to":"active","reason":"Includes an SPL meter with A/C weighting and ANSI Fast/Slow modes, with calibrated microphones measuring up to 120 dB SPL.","job":"shadow"},{"id":149743,"at":"2026-10-18T01:56:11.606Z","kind":"membership_added","list":"audio-analysis","app_store_id":325307477,"app":"audiotools-db-sound-audio-325307477","from":null,"to":"active","reason":"Suite of acoustic analysis tools: RTA, FFT, Audio Scope, Impulse Response, marketed as professional audio and acoustic analysis.","job":"shadow"},{"id":138232,"at":"2026-10-17T03:09:13.388Z","kind":"app_added","list":null,"app_store_id":325307477,"app":"audiotools-db-sound-audio-325307477","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-analysis","list_name":"audio analysis","status":"active","review_status":"checked","position":2,"tier":"A","score":89.1,"components":{"rating":95.5,"votes":78,"rank":82.8,"recency":100},"ranks":[{"country":"us","rank":6},{"country":"gb","rank":7},{"country":"ca","rank":9},{"country":"au","rank":8}],"verdicts":[{"verdict":"keep","reason":"Suite of acoustic analysis tools: RTA, FFT, Audio Scope, Impulse Response, marketed as professional audio and acoustic analysis.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-18T01:56:11.606Z","attempts":1,"current":true},{"verdict":"keep","reason":"Its core is professional audio and acoustic analysis: RTA, FFT, audio scope, polarity testing and SPL measurement of sound around the phone.","verifier":"list check","decided_at":"2026-10-18T01:56:11.606Z","attempts":1,"current":true}]},{"list":"sound-measurement","list_name":"sound measurement","status":"active","review_status":"checked","position":null,"tier":null,"score":68.4,"components":{"rating":95.5,"votes":78,"rank":0,"recency":100},"ranks":[],"verdicts":[{"verdict":"keep","reason":"Includes an SPL meter with A/C weighting and ANSI Fast/Slow modes, with calibrated microphones measuring up to 120 dB SPL.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-18T01:56:11.606Z","attempts":1,"current":true},{"verdict":"keep","reason":"It includes a calibrated SPL meter that measures ambient noise up to 120 dB, so it is a direct alternative to Decibel X.","verifier":"list check","decided_at":"2026-10-18T01:56:11.606Z","attempts":1,"current":true}]}]},"data_version":40800,"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/audiotools-db-sound-audio-325307477/"}}