Markdown Notes Editor vs Acoustic Detector

Linen is a Markdown notes app for iPhone, iPad and Mac. Write your notes in Markdown and switch to the preview to see them formatted. WRITE • An editor that colors headings, lists, links and code as you type • One menu for headings, bold, italic, lists, tasks, quotes, code and tables • Outline to jump between headings, find in note, and a focus mode that hides everything but the note • Insert a picture or paste one from the clipboard READ • A preview of your note with GitHub Flavored Markdown formatted: tables, footnotes, code with syntax colors, and task lists you can tick • Math typeset from LaTeX, inline or on its own lines • Diagrams drawn from Mermaid text: flowcharts, sequence diagrams, timelines and more • Four themes, Linen, Paper, Sepia and Slate, each in light and dark, with adjustable text size CONNECT • Link notes to each other with [[double brackets]] and see which notes link back • Tag notes with #tags and show every note that carries a tag • Version history keeps earlier versions of a note, ready to bring back YOUR FILES • Keep notes in folders inside Linen, or open .md files from anywhere • Linen Pro: open a whole folder from iCloud Drive or Files and work on its Markdown files where they are. • Open PDFs beside your notes. Linen Pro: highlight, underline, add text, and rotate, reorder, add or delete pages. SHARE • Export Markdown. Linen Pro: export HTML, PDF and Rich Text. • Linen Pro on Mac and iPad: editor and preview side by side. Linen is free for up to five notes. Linen Pro removes the limit and adds the features marked above, as a weekly subscription or a one-time lifetime purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Measure, analyze and treat sound like a pro: from a quick noise check to a full room-acoustics study. FREE • SOUND METER: live dB level with min, average and max, microphone calibration against a reference meter, and color-coded history charts. • ANALYZER: frequency spectrum, with pure-tone detection (frequency, period and wavelength). • MEASUREMENTS TABLE: a log of everything you measure, with filter, sort and a clean PDF report with charts. • TUNER: guitar (5 tunings), ukulele, violin, viola, cello, mandolin, banjo, or any note or voice, with a needle, cents deviation and a vibration when you are in tune. COMPLETE (one-time purchase, no subscription) • RECORDER: record sound to a WAV file, flag every moment louder than a threshold you choose with markers, replay them with one tap and share the audio. • EQUALIZER: improve a voice or music with a 31-band equalizer, in manual mode (you set each band) or automatic mode (the app sets it for a voice or music profile), with the live spectrum, high-pass and low-pass filters, and export of the equalized audio. • TREATMENT: enter your room (or scan it with LiDAR), pick the materials, and get the reverberation time (RT60) against a target for your use case, plus how much acoustic foam you need. • RT60 BY FREQUENCY: octave bands from 125 Hz to 4 kHz, so you can see where the bass is the problem. • MATERIAL ABSORPTION: absorption coefficient curves for every surface of the room. • NOISE MAP: tap points on the room plan, measure the level at each one and get a heat map of the noisy zones. • LIVE RT60 MEASUREMENT: a short noise burst, and the microphone measures the decay. • CALCULATORS: sum of sound sources, sound pressure level, frequency, period and wavelength, and a double-wall (mass-spring-mass) calculator with resonance frequency and insulation by frequency. For iPhone and iPad. Available in English, French, Spanish, German, Portuguese, Italian and Japanese. Your measurements stay on your device. No account, no ads. If you bought Acoustic Detector before it became free, everything stays unlocked automatically. Results are indicative: they rely on standard acoustics models and the iPhone microphone, not on certified instruments.