Free quota and Energy on TachNhac.com

Every tool on TachNhac.com has its own free quota, counted over a rolling 7-day window rather than reset on a calendar. Once it is used up, some tools open a way to pay in Energy (E). Free runs are always spent first, and someone who has topped up Energy keeps their full free runs.

How big is the free quota?

Free runs in each 7-day window:

• ◆Music separation and the link downloader: 2 runs for guests who are not signed in, 5 runs for signed-in users.
• ◆Audio converter: 2 runs for guests, 7 runs for signed-in users.
• ◆PDF to MIDI: 1 page for guests, 5 pages for signed-in users.

How does paying in Energy work?

1 Energy (E) = 1,000 VND, and it is used only on TachNhac.com. The smallest top-up is 5E (5,000 VND); packages from 75E up carry a bonus, for example topping up 100E (100,000 VND) gives 112E. After the free quota is used up, reference prices are:

• ◆Music separation: 1E per minute times the number of layers on the Spleeter engine, so a 4-minute track split into 4 layers costs 16E. The HTDv4 engine, which runs in your browser, costs 2E per minute times the number of layers.
• ◆Link downloader: 1E per 4-minute block.
• ◆Audio converter: 1E per run.
• ◆PDF to MIDI: 10E per page, up to 9 pages per file.

What does the tool say before it charges Energy?

When a run goes past the free quota, the tool names which ceiling was hit (number of runs, length, file size or layer count) and shows the Energy price before charging. If a job ends with no result files, the tool shows an error and refunds the Energy it charged.