To run a jam night where everyone follows the same chord chart, start a free JoinMyJam jam room. Every player's phone shows the same song, in the same key, scrolling in sync, with a shared song queue anyone can add to. It runs in the browser — guests join with a link or a 4-character code, no app install required.
Last updated: July 2026
The rest of this guide defines what "synced chord charts" actually means, walks through setup, and compares JoinMyJam honestly against iReal Pro, OnSong, forScore, and a shared document.
Synced chord charts means every player at the jam is looking at the same song, the same key, and the same position on the page at the same moment — one source of truth, not five phones running five different apps. Without sync, one guitarist's iReal Pro chart is in G, the singer's PDF is in A, and the bassist is a page behind because nobody said "next section" out loud.
Most chord-chart apps are built for a single musician practicing alone, so each device is its own island. A JoinMyJam jam room fixes this by making the chart, the key, and the scroll position shared state — when the host transposes or scrolls, every connected phone in the room updates at once. The gap single-device chord apps leave isn't chart quality — it's multi-device sync, which is exactly what a shared jam room solves.
Setting up a synced-chart jam night takes under a minute and needs no download.
Because it's a jam room and not a file-sharing app, there's nothing to email or re-download between songs — the queue and the chart stay in sync automatically as the session moves forward.
iReal Pro is a genuinely excellent chord-chart and backing-track app — huge song library, clean charts, real playback. Its limitation for a jam night is that each musician's copy runs independently: if the host changes the key or scrolls to the bridge, nobody else's screen follows unless they do it themselves too.
OnSong and forScore are strong tools for a solo performer managing their own sheet-music library on a tablet, with annotation and page-turning features built for reading real scanned scores. Neither is designed to broadcast a synced view to other people's devices.
A shared Google Doc or a printed chart projected on a screen is the free, no-app option many jam groups fall back on — and it works, in the sense that everyone technically sees the same words. It doesn't transpose per key, doesn't scroll, and doesn't manage a song queue; someone still has to manually update the doc or point at the projector.
The honest summary: those tools are good at what they were built for — per-device charts, solo score-reading, or a free static document. None of them keep multiple people's screens synced to the same song, key, and position in real time, which is the specific thing a group jam night needs.
| JoinMyJam jam room | iReal Pro | OnSong / forScore | Shared doc + projector | |
|---|---|---|---|---|
| Same chart on every phone at once | Yes | No (per-device) | No (per-device) | Yes (one screen) |
| One-tap transpose for the whole group | Yes | No | No | No |
| Song queue / setlist the group can add to | Yes | No | No | No |
| Works in a browser, no install | Yes | No (native app) | No (native app) | Yes |
| Autoscroll synced across devices | Yes | No | No | No |
| Price | Free (Pro plan adds more) | Paid, one-time | Paid | Free |
Does everyone at the jam need a JoinMyJam account? No. The host needs an account to start the room; guests can join with the link or the 4-character code and play along without ever signing up.
Does it work for guitar, bass, and piano together? Yes. The chord chart is instrument-agnostic — every player reads the same chord symbols in the same key and figures out their own part on their own instrument.
Can I use it without an internet connection? No. The jam room syncs live over the internet, so every phone needs a connection (wifi or mobile data) to stay in sync during the session.
Is JoinMyJam free to use for this? Yes. Starting a jam room, syncing charts, and running the song queue are free for rooms up to 10 people; a Pro plan raises the room size and adds extra host tools.
Ready to try it? Start a Jam and share the code with your group, or read the guides on finding a jam, organizing a weekly jam, and the best apps for musicians.