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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsJoyStrum is a small browser-based guitar reference that puts chord shapes, one C major scale path, standard-tuning fretboard notes, and capo transposition into a set of linked pages. According to its official site, it is meant to be opened while you practice, with no account required. It is a lookup and practice companion. It is not a guitar course, a tuner, or a virtual instrument.
Why it was built
The project’s author describes the goal as a guitar reference that can be opened in a browser during practice, with chord diagrams, a fretboard note map, one scale path, and a capo chart, without creating an account. That description comes from a project write-up as it appeared in search results, so treat it as the author’s stated intent rather than a verified product history. The current feature set is documented on the official site, which is the better guide to what the tool does today.
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What is on the site
JoyStrum’s official site groups four lookup tasks. The table below lists each one as documented, along with the boundary the site itself sets.
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| Feature | What the official site documents | Boundary the site does not go past |
|---|---|---|
| Chords | Eight common open shapes, each with fingering, notes, reference tones, and a printable chart. Starting points include a C chord, A minor, and a C-to-A-minor change. | No larger chord library is described. |
| Scale | One C major path, one octave from C3 to C4, shown in fretboard and TAB views, labelled with note names or scale degrees. | No other scales or patterns are described. |
| Fretboard | Note positions in standard tuning, with a full reference through fret 24. Strings are listed low to high as E, A, D, G, B, E. | No alternate tunings are described. |
| Capo | Forward transposition shows what a shape sounds like with a capo. Reverse lookup starts from a desired chord and returns a shape and fret. The home page example moves a C shape to D at fret 2, a two-semitone change. | The examples given are the ones the site shows; no wider capo chart is described. |
| Reference sound | Reference audio is offered alongside the shape diagrams. | Audio quality testing, the synthesis method, and the audio implementation are not stated. |
| Printing | Printable views and a printable chord chart are offered. | Print layout and paper-size options are not stated. |
| Saved items | Saved references stay in the current browser. No account or cloud sync is used. | How saved data is stored and how long it is kept are not stated. |
How the four tasks connect
The tools are linked so that one lookup leads into the next. The C chord is a useful example. Its tones are C, E, and G. The C major scale contains those three notes along with D, F, A, and B, so the chord sits inside the scale path rather than being a separate fact. The fretboard view then shows where those notes fall on the strings in standard tuning.
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A practice sequence using the site
- Open the C chord shape and note its three chord tones: C, E, and G.
- Open the C major path (C3 to C4) and find those three notes among the seven scale notes, C, D, E, F, G, A, and B.
- Switch to the fretboard reference and locate the same notes on the strings in standard tuning. Check the positions against the E, A, D, G, B, E string order.
- Use reverse capo lookup to find a shape and fret for a chord you want to play, for example a chord that a capo would let you play using a shape you already know.
Capo transposition in practice
Capo transposition works in two directions. Forward lookup answers the question “what does this shape sound like with a capo at fret N?” Reverse lookup answers “which shape and fret produce the chord I want?” The site’s home page example uses the C shape moved to fret 2, which sounds as D. That is a two-semitone shift, and it shows the arithmetic the tool is doing: each fret raises the pitch by one semitone.
Reference sound, printing, and saved references
Reference sound
Reference audio is offered next to the chord diagrams so you can hear a shape as you look at it. The official site does not describe how the audio is produced or how it was checked, so the tool should be treated as a listening aid for the shape, not as a benchmark for tone.
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Printable views
Chord content can be printed as a chart for a practice sheet or a music stand. This is a convenience feature; the site does not describe other print formats.
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Saved items remain in the browser you are using, and the site states that no account or cloud sync is involved. That is the extent of what the site says about storage. If you save references on a shared computer or switch browsers, the site’s own description is the only guidance available.
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What the browser platform does and does not prove
The Web Audio API is a plausible foundation for a reference-sound feature. MDN Web Docs describes it as available across browsers since April 2021, and its page was updated in 2026. MDN also notes that some parts of the API vary in support across browsers and devices. The API covers audio contexts, nodes, routing, and output to speakers or headphones. The W3C specification describes further capabilities, such as scheduled playback, live audio input, and script-generated audio.
These are capabilities of the platform, not a description of what JoyStrum uses. The official site does not say which parts of the API the project relies on, and nothing published there establishes microphone input, a generated guitar tone, low latency, offline use, or compatibility with every browser. Read the platform documentation as an explanation of what a browser can do, not as a promise about this project.
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Where a physical capo fits
The browser reference does not require anything beyond a browser. For readers who want to try the capo charts on a real guitar, a physical capo is the one accessory that matches the feature directly. Place it beside the capo instructions and use it to check the forward and reverse results by ear.
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Using JoyStrum for comparison
If you are comparing JoyStrum with another guitar reference, the useful questions follow the tasks above: how many chord shapes and scale patterns are included, what tuning and fret range is covered, whether capo lookup works in both directions, whether diagrams show notes and fingering, whether reference audio and print views are available, and whether saved items need an account. On the documented scope, JoyStrum offers eight open shapes, one C major path, standard tuning through fret 24, two-way capo lookup, reference sound, printable views, and browser-only saved references. Its own copy puts it this way: “Clear diagrams. Reference sound. No account needed.” That is product wording from the project, not an independent evaluation.
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