Comparison

Fretboard King vs Celestial Strings

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Fretboard King

Master every note on the guitar fretboard with quick, interactive drills. This app provides instant feedback and personalized insights to help you learn scales, chords, and improvisation skills efficiently. It offers various modes to suit your learning pace and focus.

Highlights
  • 10-note learning sessions
  • One-tap answering with instant feedback
  • Misses highlight correct positions
  • Timed and untimed modes
  • Drill specific strings
  • Octave challenge
  • Offline functionality
Features
Read full description

Learn every note on the fretboard - the skill that unlocks solos and ups your level. Fretboard King drills you in fast sessions. The app names a note and a string, G on the A string. Tap where it is on the neck, or play it on your guitar and the app listens. You know instantly if you're right, and if you miss, the correct fret lights up. Round by round, you learn every note on every string. Includes learning hub for new learners. Core value: you learn every note on the guitar neck, so scales, chords and solos start to make sense. -Note-find drill. The app names a note and a string, and you tap where it is. You build instant recall of every note on the neck. - Rounds of 6, 12 or 24 notes. A round fits a spare minute or a long practice session. - Timed or untimed. Learn at your own pace, then push for speed. - String and fret filters. You drill exactly the part of the neck you want. - Octave game. Find one note on every string. You connect notes across the whole neck instead of learning them string by string. - Focus sessions. One tap drills your weakest string. Practice goes where you need it most. - Mic note detection. Play the note and the app checks it. Audio stays on your phone and is never recorded. You practise on the actual instrument, not just a screen. - Listening card. It shows the note you're playing in real time. You know right away whether you hit the right note. - Octave quiz on the guitar. Play a note, then its octave. Octave shapes end up in your hands. - Built-in tuner. An in-tune guitar means the app reads your notes correctly, with no separate tuner app needed. - 4 guided lessons: Open String Mastery, Landmark Frets, Standard Octaves, The B-String Shift. You get a step-by-step method, not just repetition. - Fretboard Explorer. Tap a note and see it everywhere on the neck. You see the patterns across the whole neck at a glance. - Progress sheet: accuracy trend, per-string bars, trickiest note, best streak, answer speed. You see exactly where you're improving and what to work on. - Daily Note: one question a day, with a link straight into a round. Keeps the habit going in a few seconds a day. - Progress nudge. It fires only when your accuracy has actually improved. It encourages you with real progress, not reminders for their own sake. IT WORKS Our data proves, players average 55% in their first round and increase in only a few sessions to above 80%. No sign-up, no account. You're practising within seconds of opening the app. No monthly fees. It's free and supported by ads, and heavy practice days can unlock ad-free overtime by watching one video. You can try the whole app before spending anything. Works offline. You can practise anywhere, even on the bus.Advanced players score 100%. Keep drilling until you do.

About

Celestial Strings

This app provides six essential tools for guitar practice, including a tuner, metronome, chord library, fingerstyle trainer, fretboard trainer, and song library. It focuses on practical functionality without subscriptions or gamified elements, designed for musicians who want focused practice.

Highlights
  • Real-time pitch detection tuner
  • Accurate metronome with various time signatures
  • Chord library with verified fingerings
  • Fingerstyle pattern trainer
  • Fretboard note identification trainer
  • Accurate song riff transcriptions
Features
Read full description

Celestial Strings is a practice companion for guitar — six focused tools, no subscription, no streaks or badges nagging you to keep a habit alive. Just the instruments you actually reach for between practice sessions. ORACLE — TUNER Real-time pitch detection built on the McLeod Pitch Method, tuned by ear against a Python reference implementation before a line of Swift shipped. Works for any tuning your instrument uses, with a capo control that shifts what counts as "in tune" without changing which string you're touching. PULSE — METRONOME A clean, accurate metronome with every time signature you'd actually use, swing subdivisions, and a tempo that's remembered the next time you open it. CODEX — CHORD LIBRARY & FRETBOARD Every common chord — majors, minors, sevenths, sus2/sus4, add9 — with real, hand-verified fingerings, not algorithmically nearest-fret guesses. Explore the fretboard note by note, or drill chord changes against a real strum pattern (down-up, pop-rock, reggae skank, and more) at your own tempo. LOOM — FINGERSTYLE TRAINER Learn and practice fingerstyle patterns with a hand diagram that shows exactly which finger plucks which string, in real time. Build your own patterns in the custom editor, or start from patterns you already know. TRIALS — FRETBOARD TRAINER Name the note at a given fret, cold. The fundamental skill under every other room, drilled directly. RIFFS — SONG LIBRARY Real riffs, transcribed accurately — down to the bends, pull-offs, and slides — not simplified stand-ins. Play along at your own pace. No accounts. No ads. No streaks. Just an instrument's worth of tools, built by a guitarist who wanted them to exist.

Screenshots

Fretboard King4 screens
Celestial Strings4 screens

Verdict

The call

The clearest difference is iOS requirement: Fretboard King at 15.1 against Celestial Strings's 17.0. On price, rating, ratings volume and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Fretboard King against 5.0 for Celestial Strings. Both are backed by a comparable volume of ratings — 4 and 3 respectively.

Scorecard1 real difference · 8 level
Fretboard King versus Celestial Strings: the parameters behind the verdict, then further details
ParameterFretboard KingCelestial Strings
PriceFreeFree
Rating5.0 (4 ratings)5.0 (3 ratings)
Number of ratings4 — better3
Update frequencyEvery 4 days—
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.1 — better17.0
Further details — not scored
Size26 MB151 MB
Age rating4+4+
DeveloperPaul McCarthySandeep Koirala

Customer experience

Fretboard King

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Celestial Strings

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Fretboard King

No in-app purchases

None

Celestial Strings

No in-app purchases

Questions

Is Fretboard King free?
Fretboard King is free to download, with no in-app purchases.
Is Celestial Strings free?
Celestial Strings is free to download, with no in-app purchases.
Which has better reviews, Fretboard King or Celestial Strings?
Fretboard King and Celestial Strings are both rated 5.0 out of 5 on the App Store, from 4 and 3 ratings respectively.
Do Fretboard King or Celestial Strings have ads?
Neither Fretboard King nor Celestial Strings shows ads.

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