KEYSOL vs FretTools
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KEYSOL
Stream and control your music playlists from your mobile device. Synchronize music across multiple devices or enjoy independent playback in different rooms. Supports various audio formats and internet radio sources.
- Playlist playback and control
- Multi-device synchronization
- Independent room audio
- Support for Airplay, DLNA, WiFi DIRECT
- Wide range of audio format support
- Internet radio and local file streaming
- NAS streaming
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Con l’App Giove KEYSOL potrai riprodurre, controllare,condividere le playlist direttamente dal tuo dispositivo. Goditi la tua musica ovunque! Utilizzando più dispositivi KEYSOL puoi sincronizzare la musica o rendere indipendente ogni stanza. • Supporta: Airplay, DLNA, WiFi DIRECT. • Formati audio: AACLC/LTP,HE-ACCv1,HE-ACCv2,AMR-NB,AMR, WB,FLAC, MP3,Vorbis,PCM/WAVE,ALAC.. • Sorgenti internet: Spotify, Tidal, TuneIn, IHeartRadio, ecc. • Sorgenti locali: musica residente nel proprio dispositivo mobile, streaming da NAS (disco di rete). • 2 Modalità: 1. One song-One Room: utilizzo di un singolo dispositivo, anche in stand-alone. 2. One song-Multiple Rooms: possibilità di creare gruppi composti da più dispositivi e ascoltare la stessa musica sincronizzata in piu’ zone.
FretTools
This app offers a precision tuner, an extensive chord library with interactive playback, and a gear tracker for instruments and equipment. It's designed for musicians to streamline their practice and documentation needs.
- Real-time chromatic tuner for multiple instruments
- 2,500+ chords with 3,200+ voicings
- Interactive chord playback
- Instrument and equipment gear tracking
- Maintenance logging and PDF export
- Offline functionality
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FretTools Gear Tracker. String Diagnostics. Tuner. Chord Library. GEAR TRACKER Your gear documented and accessible when it matters. • Track guitars, basses, amps, pedals, and more • Store serial numbers, specs, purchase details, values, and notes • Attach photos to each item • Record string changes with brand, model, gauge, and date • Log maintenance, repairs, setups, and modifications • Export a formatted PDF with gear details for insurance or resale STRING DIAGNOSTICS Know what's happening inside your strings, not just what note they're on. FretTools analyzes six harmonics in real time using phase-shift detection — the same moment you'd normally just tune to also tells you whether a string is going dead, sitting out of intonation, or due for a change. • String Health evaluates tuning stability and harmonic agreement • Intonation analysis helps reveal possible setup inconsistencies • Harmonic Lanes for detailed pitch analysis • Save diagnostic history to a selected instrument • Compare readings across the life of the current string set • Start a new session when you log a string change String Diagnostics is a Pro feature. It runs on the same pitch engine as the free tuner below, but it's a separate capability — most tuners tell you a note. None of them tell you your string is dying. String Diagnostics provide guidance and do not replace a full instrument inspection or professional setup. TUNER — FREE. ALWAYS. Responsive, accurate tuning for guitar, bass, ukulele, banjo, mandolin, violin, and more. • Real-time note and cents display • Strobe-inspired ring for clear sharp/flat feedback • Instrument-specific tuning presets CHORD LIBRARY Find chords quickly across multiple guitar tunings, ukulele, and mandolin. • 2,500+ chords with 3,200+ voicings • Clean diagrams with finger positions • Open chords, barre chords, inversions, and alternate voicings • Slash chords with alternate bass notes • Browse by root, chord type, category, or key • Diatonic chords grouped by harmonic function • Play full chord strums • Tap individual notes to hear them in isolation WHY FRETTOOLS • Four practical tools in one app • Works offline • No account required to get started • Clean, focused interface • Built for working musicians and hobbyists alike FREE → PRO The Tuner is unlimited and always free. Upgrade to Pro for: String Diagnostics • String Health and intonation analysis • Harmonic Lanes for detailed pitch analysis • Diagnostic history, saved and compared per instrument Gear • Unlimited gear items • Up to 8 photos per item • Maintenance and string-change tracking • PDF export Chords • Additional voicings and inversions • Slash chords • Full key-based browsing Additional • Removes ads THE BOTTOM LINE Track your gear. Know when your strings need attention. Find the chords you need. Privacy Policy: https://frettools.com/privacy Terms & EULA: https://frettools.com/terms
Screenshots
Verdict
The clearest difference is review sentiment: FretTools at 100% against KEYSOL's 0%. FretTools also leads on update cadence (every 6 days vs every 14 months). KEYSOL's advantage is in-app purchases (none vs 3) and device support (3 vs 1). On price 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
Both are free to download. FretTools sells 3 in-app purchases, starting at $2.99 per month. KEYSOL asks for nothing beyond the download.
KEYSOL ships an update every 14 months, FretTools every 6 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.
| Parameter | KEYSOL | FretTools |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (8 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | — | 8 — better |
| Update frequency | Every 14 months | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 10.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 158 MB | 66 MB |
| Age rating | 4+ | +4 |
| Developer | Vivaldi S.R.L. | webLuthier, LLC |
Customer experience
KEYSOL
FretTools
In-app purchases
KEYSOL
No in-app purchases
FretTools
- Monthly Pro$2.991 Month
- Yearly Pro7 Days trial$17.991 Year
- Lifetime Pro$49.99









