Support & Docs
Clear setup steps, feature docs, and answers to common Tempo Kit questions.
MetronomeTimer & StopwatchChromatic TunerVideo PracticePractice LibraryPractice NotesKeyboard ShortcutsSettings & LanguagesPro & PaymentsStorage & PrivacyContact Support
Install Tempo Kit
Get Tempo Kit from the Chrome Web Store in a supported Chromium-based browser. After installing, click the extension icon or pin it to your toolbar for quick access.
Metronome
Free
What does each control do?
BPM slider / inputSets beats per minute. Range: 30–600. Drag or type directly.Tap Tempo buttonTap at least twice in rhythm — Tempo Kit averages your taps to set BPM.Time signatureNumerator = beats per bar (e.g. 4 in 4/4). Denominator = note value.SubdivisionAdds subdivision clicks between main beats: quarter, 8th, triplet, 16th, quint, or swing feel.Per-beat intensityClick the bar segments below each beat to mute (0), ghost (1), medium (2), or accent (3) that specific beat independently.Sound typeChoose from Click, Wood Block, or Beep. All synthesized — no audio files needed.Timer / stopwatch shortcutsOpen quick timing tools while staying in your metronome practice setup.Mini drawerCollapsible video drawer at the bottom with speed, transpose, and play controls for the connected video, available while you use other tools.
Can I use timer, stopwatch, and mini controls from the metronome?
The timer and stopwatch buttons open quick mini practice tools from the metronome page, so you can time drills without leaving your metronome setup.
The sound is not playing. What should I check?
The browser may suspend the audio context until you interact with the page. Click Start/Stop once to activate audio. Make sure your system volume is not muted.
Can I save my metronome settings?
Yes — use the save preset button or the library page to save a preset with your current BPM, time signature, subdivision, and sound settings. Free users can save up to 3 presets. Pro users can save 300+ presets organized into folders.
Timer & Stopwatch
FreeHow do I use the countdown timer?
Type a duration directly in the display (HH:MM:SS), or tap one of the preset time buttons (5m, 10m, etc.). Press the Play button to start. When the timer reaches zero, an alarm plays if sound is enabled. Use the Reset button to return to your set duration.
How do I use the stopwatch?
Press the Play button to start counting up. Press the Lap button to record the current lap time — each lap shows the split time and overall elapsed time. Press the Reset button to clear all laps and return to 00:00:00.
Can I open timer and stopwatch from another tool?
Timer and stopwatch are free practice utilities. They can be opened directly from their tabs or reached from shortcut buttons on the metronome and video pages.
The alarm sound did not play.
Make sure the sound toggle (bell icon) is enabled. Browser may suspend audio until you interact with the page. Make sure your system volume is not muted.
Chromatic Tuner
FreeWhat does each readout mean?
Note name + octaveThe closest concert pitch note being detected (e.g. A4).Hz frequencyFrequency of the detected pitch (e.g. 440.0 Hz for A4).Cents (¢) arcHow many cents sharp (+) or flat (−) you are. Within ±5¢ = green (in tune). ±5–15¢ = amber (close). >15¢ = red (off).Arc needleVisual indicator: center = in tune, left = flat, right = sharp.
The tuner is not detecting my instrument. What should I check?
Allow microphone permission when the browser asks. Play closer to your device microphone, reduce ambient noise, and let the note ring out clearly. The tuner detects pitches from ~25 Hz to ~4200 Hz.
Does the tuner record my audio?
The tuner processes microphone input locally in your browser. It shows note, cents, and frequency without recording or uploading audio.
Video Practice
Pro
What does each video control do?
Refresh buttonRe-connects Tempo Kit to the current video tab. Use it if controls are not responding or Tempo Kit is not detecting the video — usually a sync issue after a page load or website tab/video switch.Speed / Playback rateSlows down or speeds up the video from 0.1× to 3×. Use the +/- button to increase or decrease the rate by 0.05x.Transpose (semitones)Shifts the pitch of the video audio up or down by 1–12 semitones. Use the +/- buttons to change the pitch by 1 semitone at a time. Great for playing along in a different key.Reset button (↺)Resets that control back to its default (0 semitones / 1× speed / 0:00 time for loops).A-B Loop markersClick A and B to set loop points at the current playback position. Arrow up or down adjusts a point by 1 second. The loop icon plays between the two points.Saved loopsAdd multiple named A-B loops for the current video, select one at a time, sort by time, and save them with a Library preset.Save / load presetsSave the current video setup and load it later from the Videos page or Practice Library.Detect BPMUse Detect BPM to estimate the video's tempo, then click Set Metronome to use the detected BPM.Timer / stopwatch shortcutsOpen quick timing tools while staying in your video practice setup.Mini drawerCollapsible metronome drawer at the bottom with BPM, quick −/+, and play controls available while you use other tools.
How do I connect Tempo Kit to a video?
Open a YouTube or Bilibili video in a browser tab or window. Open Tempo Kit, switch to the Videos tab inside the extension, and click the refresh button if the video is not detected automatically. Have one video playing at a time.
Which sites are supported?
YouTube and Bilibili are the built-in, tested sources. For your own audio or video files, open the Practice Player. Other standard web players may work when the site allows browser extension control.
works fullydepends on the site
YouTube
built in
Bilibili
built in
Practice Player
local files
Standard players
tap connect
Speed
Works fully
Works fully
Works fully
Depends on the site
Transpose
Works fully
Works fully
Works fully
Depends on the site
A-B loop
Works fully
Works fully
Works fully
Depends on the site
BPM detect
Works fully
Works fully
Works fully
Depends on the site
Save presets
Works fully
Works fully
Works fully
Depends on the site
Standard players are not individually tested and may be limited by the site, browser, or media protection. Tempo Kit works on your device and does not record, download, or bypass access controls. See Terms and Privacy.
Why did my video preset settings not apply when the preset opened a new tab?
The video page may need a few seconds to finish loading before saved settings are applied. If it doesn't load when new tab open, click the Refresh button in the Videos tab or click load in the library-preset page.
Can Tempo Kit control multiple videos at once?
No — use one connected video at a time. If you have multiple video tabs open, connect to the one you want to practice with and refresh if the wrong tab is selected.
The BPM detection did not work. What should I try?
Let the song play without pausing and without any video settings applied. Use a section with a clear beat, and make sure the video's volume is not muted. If detection times out, refresh the connection and try again.
Why is the detected BPM wrong when I change speed or transpose?
Detect BPM at normal playback first: 1× speed and 0 transpose. Speed changes how fast the beats arrive, and transpose can affect the audio path used for analysis.
Tip: detect first, set the metronome, then add your speed and transpose for practice.
Practice Library
Free + ProHow do I save a preset?
Open the Library tab, create a folder (Pro) or use the default folder (Free), then click the + Add Preset button. Fill in a name and it will save your current BPM, time signature, subdivision, and sound settings. To attach a video URL and its settings, add it in the preset's video section. Note: video practice is a Pro feature — on the Free tier, presets work best for metronome setups, since a saved video link and its speed/pitch/loop settings only take effect with Pro.
How many presets can I save?
Free users can save up to 3 presets. Pro unlocks 300+ presets, folders, notes, and saved video practice profiles. The exact practical limit depends on the browser's local storage quota and the size of each preset.
What happens to my library if I cancel Pro?
Your saved presets remain in storage. However, if you have more than 3 presets saved (which requires Pro), you will not be able to save new ones after returning to the Free tier. Existing presets are not deleted.
Can I back up my library or move it to another computer?
Yes — and it works on every plan, free or Pro. In the Library tab, use the Export button (down-arrow icon) to download your whole library as a single .json file named tempokit-library-<date>.json. It includes your folders, presets, video settings, and the notes attached to each preset. On another device or browser, open the Library tab, use the Import button (up-arrow icon), and choose that file — it merges into your existing library rather than overwriting it. Duplicate preset names are skipped, and free-tier limits still apply (a free account only restores up to its 3-preset limit). Keep the file somewhere safe; it is your backup.
Practice Notes
Free + ProHow do practice notes work?
Tap the notes button on the metronome, timer, stopwatch, or video pages to open a small note card over your practice. Jot reminders as you play — “loop the bridge slower” or “watch the timing in chorus A.” It’s one note at a time and it stays with you as you switch between those tools. Pin it to keep it open across pages, or close it with ×.
How do my notes save? Do I need to press a save button?
Your current note saves automatically as you type, so it’s never lost — even if you close the card or the side panel.
To keep a note attached to a specific setup, save a preset. The note is stored as part of that preset, alongside its BPM, time signature, and video settings, and it comes back when you load the preset later.
What happens to my note when I load a different preset?
The card shows the note for whatever you are working on now, so loading a preset swaps the card to that preset’s note. Free users can keep notes on up to 3 saved presets; Pro unlocks 300+ presets and folders to organize notes by song, drill, or video.
Keyboard Shortcuts
All PlansWhat keyboard shortcuts are there?
Anywhere — when you are not typing in a field
SpacePlay / pause whatever tool/tab you are on — metronome, video, timer, or stopwatch.PPlay / pause the timer or stopwatch on their main pages, or the mini timer/stopwatch when open on the metronome or video page.RReset the timer to its set duration or clear the stopwatch on their main pages, or reset the matching mini timer/stopwatch when open on the metronome or video page.LRecord a lap on the stopwatch (or the mini stopwatch when it is open on the metronome or video page).
While editing a field
↑↓Nudge the value by one step: BPM by 1, the timer by 1 second, A-B loop points by 1 second, Transpose by 1 semitone, Speed by 0.05x.EnterCommit the value you typed — works for BPM, Speed, Transpose, timer, and A-B loop points. Clicking or tabbing away does the same thing. For the timer, Enter sets the time without starting it.
You can turn all single-key shortcuts on or off in Settings → Keyboard Shortcuts.
A shortcut did not do anything. Why?
The single-key shortcuts (Space, P, R, L) are suppressed whenever your cursor is in a text field, or while the Settings panel, Library, or a picker is open — so they never fire while you are typing a BPM or naming a preset. Click an empty part of the panel first, then try again. Shortcuts also ignore Ctrl, Alt, and Cmd combinations. You can also disable all single-key shortcuts entirely from Settings → Keyboard Shortcuts.
Settings & Languages
All PlansWhich languages and settings are supported?
Tempo Kit supports English, Chinese, and Spanish, plus light/dark theme, metronome sound, mini controls, notes button, keyboard shortcut, and Pro plan management.
Where do I manage Pro?
Open the gear icon in Tempo Kit to choose a plan, restore Pro access, or manage an existing subscription through ExtensionPay (Stripe).
Pro & Payments
ProCancellation & refunds: You can cancel recurring subscriptions anytime from Settings → Manage Subscription. Cancellation stops future renewals, and Pro access continues through the end of the current paid billing period. Tempo Kit generally does not provide prorated refunds for unused subscription time, but may issue refunds for duplicate charges, billing errors, or serious technical problems at our discretion. For more information, please read our Cancellation & Refund Policy.
How to unlock Pro
- 1
Install free
Add Tempo Kit from the Chrome Web Store — no account needed.
- 2
Open Settings
Open Tempo Kit and click the gear icon at the top-right, then scroll to the plans.
- 3
Pick a plan
Choose Monthly, Yearly, or Lifetime. Checkout is handled securely by ExtensionPay (Stripe).
I bought Pro but the extension still shows free. What do I do?
Close and reopen the extension — Tempo Kit checks your Pro status on open and when you return from checkout. If it still shows free, go to Settings and use Restore Pro. ExtensionPay will ask for the purchase email on its own secure page and send a login link to restore Pro on this device.
Restore Pro opened a payment page or didn't unlock. Why?
Restore Pro only unlocks the email that has an active subscription. Enter the exact email you paid with. If that email hasn't purchased Pro — or its subscription was canceled or expired — ExtensionPay sends you to the plans page instead of restoring (a lifetime purchase always restores). After you click the login link in your email, give the extension a few seconds or reopen the side panel.
How does Pro payment work? Is it handled by Tempo Kit?
No. Payments are fully handled by ExtensionPay, a payment platform built for browser extensions, which uses Stripe for processing. ExtensionPay and Stripe's privacy policies apply to payment data.
How do I cancel a subscription?
Open Tempo Kit → Settings → Manage Subscription. This opens the subscription management page (powered by Stripe) where you can cancel. After cancellation, Pro access continues until the end of your paid billing period.
What is the refund policy?
You may cancel your subscription at any time. Cancellation stops future renewals, but Pro access continues until the end of your current billing period. Tempo Kit generally does not provide prorated refunds for unused subscription time, but may issue refunds for duplicate charges, billing errors, or serious technical problems at our discretion. For more information, see our Cancellation & Refund Policy. For billing help, email crescendocompanion@gmail.com with your purchase email address.
Can I transfer Pro to a different Google account or device?
Pro is tied to the email address used for purchase. On a new device or browser profile, use Settings → Restore Pro to restore access without buying again.
Storage & Privacy
All PlansDoes Tempo Kit collect any personal data or analytics?
Tempo Kit has no analytics, no tracking, and no advertising cookies. Small settings are stored in synced browser extension storage when available, while presets, folders, notes, and video practice profiles are stored in local browser extension storage. The extension communicates with ExtensionPay (Stripe) only for purchase, restore, and Pro entitlement checks.
Does the tuner or BPM detection record or upload audio?
No. Microphone audio for the tuner and tab audio for BPM detection are both processed entirely inside your browser using the Web Audio API. Nothing is ever recorded, stored in extension storage, or sent to any server.
Still need help?
Contact Support
Include your purchase email if the issue is about Pro, and the video URL if the issue is about saved settings or detection not working.
Common fixes before emailing
- Pro not showing after purchaseClose and reopen the extension. Or use Settings → Restore Pro.
- Video settings not appliedWait for the video to load, then click the Refresh button in the Videos tab.
- Tuner not detecting soundAllow microphone permission and play close to your device mic in a quiet environment.