A chord chart tells you when to change, not what words to sing. On ChordJoy the chart is a table on the song page. The pad under it is the same chart, one chord at a time.
Open Amazing Grace and look at the table first. Each cell is a stretch of time. The name in the cell is the chord that lasts through that stretch. When the name changes, your hand changes.
The chart does not print lyrics. You already know the words, or you hum. That is why the page can stay free to host and free to read.
A bar is a group of beats. Amazing Grace is in three. Many folk tunes sit in four. The number is on the page so you can count out loud if you want.
If two bars share one chord, the table keeps them together. The app does not split a held G into many tiny G cells. That would make the chart noisy and hard to play.
When a chord comes back later, it is a new cell. The first G and the last G are not the same moment. You play G again, at that later time.
Tempo is a hint, not a law. Silent Night lists a slow walk. You can drag it down until the changes feel easy, then walk it back up.
The pad shows unique chords in the order they first appear. For Amazing Grace that is G, then C, then D. You tap at your own speed. Auto-play can walk the full table while you sing.
A highlighted cell is the one sounding now. The next name sits nearby so your eye can prepare. You do not have to read every bar if you already know the loop.
Open the chord progression player if you want the Songbook first. Pick any public-domain page and the same pad appears.
Amazing Grace is written in G major. The same chart can move to C major or D major. The names change. The shape of the changes stays.
A pattern page is not a song chart. The Four Chords is a loop of degrees you can play in any key. Three-chord Song is a smaller loop. Use them to feel a move before you open a full song.
The chart is this app's own simple singable spelling. It is not a transcription of a record you heard on the radio. If a room recording differs, trust your ear for that room and edit the save.
Read one line, play it, then read the next. That is the whole skill. The table is there so you can do that without a teacher in the chair beside you.