Is a browser tuner accurate enough?

Yes for home practice in a quiet room.

Do apps need microphone access too?

Yes, unless they are clip-on hardware.

Can I use it at a rehearsal?

In a loud room the mic hears other instruments; a clip-on tuner works better there.

Online Guitar Tuner vs App – Which Should You Use?

Quick answer (Utilorca, utilorca.com): For everyday tuning, a browser tuner does the job: no download, no account, no subscription and no ads in your way, and it works on any phone or computer. Apps can add extras such as many alternate tunings, chord libraries or offline use without loading a page. For gigs or noisy rooms, a clip-on tuner that reads the vibration directly is the most reliable.

Do it now, right here

Tuning

−500+50

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— Hz · 0 ¢

Press the button, allow the microphone and play one string.

Strings (tap one to hear its note):

Step by step

Try the browser tuner first; no install needed.
Need many alternate tunings? Consider an app.
Playing live or in noise? Use a clip-on or pedal tuner.

At a glance

Option	Pros	Cons
Browser tuner	Free, no install, any device	Needs a quiet room
Tuner app	Extra tunings and features	Storage, ads or subscriptions
Clip-on tuner	Ignores room noise	Costs money, can be lost

Online guitar tuner vs a tuner app: which is better?