S–7 · Pocket tuner Free — no ads, no account

Know the
key. Play
along.

A simple tool that hides something powerful. Tune anything, keep every tuning you use in one place — then point it at a song and it tells you the key and the tempo, and lights up every note that belongs on your instrument.

Get S–7 — free Why it exists

The plate is real. Press MIC and tune something.

TUNER DEMO REEL
♭ A2 ♯ IN TUNE

NOTHING IS RECORDED. NOTHING LEAVES THE PAGE.

FERRIC S–7
01Why it exists

The collaborator's best friend

You are in a jam and nobody can say what key it's in. Open S–7, hold it up, and it names the key and the tempo off the room. Pick your instrument and the whole thing lights up — every note on the piano, every chord shape on the guitar, every position on the bass. Then play along.

That's the powerful part. The simple part is that it is still just a tuner: it comes up listening, it gets you in tune, and it keeps every tuning you use — standard, drop, open, or one you designed yourself — in one place you can reach in a second.

It is free, with no ads, no unlocks and no nag screen. Every player already needs a tuner, so the front door of the shop costs nothing. The restraint is the advertisement.

“Free, no ads, no in-app purchases, no nag — the restraint is the advertisement.”

— the shop book, on pricing the tuner
02Heritage

In the spirit of the needle

INSPIRED BYThe needle tunerEVERY GIG BAG SINCE THE '60S

The needle tuner is the one piece of gear every player already trusts. S–7 keeps that trust, then spends the rest of the page on what a tuner could do next if it kept listening.

WHAT STAYS
  • The needle — flat runs left, sharp runs right, green at centre
  • It comes up listening: no menu between you and in tune
  • String targets drawn like a headstock
  • Chromatic — a voice reads the same as a string
WHAT THE PHONE ADDS
  • Pick a key and the whole neck lights up with what belongs
  • Every chord in the key, with a real fingering on the neck
  • DETECT hears what is playing and names the key and tempo
  • An AUv3 that tunes what is already on a track

Not a re-creation — a continuation. If you love the hardware, you'll feel at home here; learn here, and the hardware will feel like home too.

03The field manual

Tune. See. Hear. Learn.

Tune

A 15-LED needle, flat left, sharp right. Green at centre. It comes up listening — a tuner you have to switch on is a tuner you are already fighting. Phone mic, or the plug when you press INPUT; a pickup wired straight in reads truer than a room full of reflections.

See

Choose a key and a scale — major, minor, both pentatonics, blues, and the modes — and the neck or the keys light up with what belongs. Capo up to 9 frets and the shapes move with you.

Hear

Every chord in the key, laid out with its numeral. Tap to hear it. Tap again and the neck narrows to a real fingering — dots and ✕, open position or barre.

Learn

One page. No modes, no tabs, no settings screen, nothing to save. The needle is pinned at the top and never scrolls away; everything else rides under it.

The whole manual ships inside the app. Tap the wordmark — it is the only help there is, and the only help you need.

04The screens

One page, in the dark

S-7 tuner page: the 15-LED needle green at centre, A2 in the phosphor LCD, string targets below
THE NEEDLE — IN TUNE ON A2
S-7 with the key of C major chosen: the fretboard lit with every note that belongs, roots brighter
C MAJOR, ON THE NECK
The S-7 field manual open in the app: NOT JUST A TUNER, the layout diagram, mic and input
THE FIELD MANUAL

Captured with the demo reel feeding the real detector a real frequency — nothing is faked. The needle is doing what it does when it hears A2.

05Also an Audio Unit

Tune what is already playing.

S–7 installs as an AUv3 effect. Drop it on a track in GarageBand, Logic, AUM or Ableton and the needle reads the signal in place — it passes audio through untouched. Bit-perfect, checked at the bench.

06The terms

Read the fine print. It's friendly.

  • FREEForever. Never monetized — the tuner is a utility, and the family's front door.
  • NO ADS, NO IAPNothing to unlock, nothing to subscribe to, nothing to dismiss.
  • NO ACCOUNTSign-in is never a gate between you and sound.
  • OFFLINENo server check, no phone-home. It works in a basement, on a plane, in 2040.
  • NOTHING RECORDEDAudio is analyzed on the device, in real time, and never stored or sent.
07House rule

Every machine in the family answers to the tuner. If an instrument and the S–7 disagree about pitch, the S–7 is right.

Free, on the App Store.

S–7 is at the counter — the listing is built and the build is signed. iPhone, iPad, the Mac app and the AUv3 are all free. The tuner is the front door; it never gets a price.

FREE ON THE APP STORE
IPHONE IPAD
Free, forever. No ads, no in-app purchases, no account.
FREE · ON THE DESK TOO
MAC APP AUv3
Free on the Mac as well, same as the app.
ON THE STORE SOON — THE BADGE LANDS HERE

Want to hear the moment it's live? The list below hears first.

08Beta testing · free

Test them free.

Every machine is in TestFlight beta right now — free to test, on your own phone, before any of it reaches the store.
Bench notes while they're built, and release day when it comes. Nothing else, ever.

Free TestFlight invites · double opt-in · unsubscribe any time

Next on the bench L–1 Library One shelf for everything the kit makes — sounds, packs, patches — on every device you own.