Published specs, live prices, and no claim we have played this gear
A clip-on tuner reads vibration through the headstock, so it works in a noisy room and it works on an acoustic with no pickup. Here is what separates them, and which brands publish an accuracy figure at all.
A tuner is the first accessory to buy and the cheapest thing on this site that changes how the guitar sounds. An instrument that is slightly out of tune does not sound like an instrument slightly out of tune; it sounds like you are playing badly. Beginners quit over this.
Clip-on tuners solve it for under the price of a set of strings. They clamp to the headstock and read the vibration of the wood rather than the sound in the air, which means a television, a housemate or a busy shop makes no difference to the reading. They work identically on an acoustic with no electronics and an unplugged electric.
What separates them is smaller than the marketing suggests: published accuracy, battery type and life, how the clamp holds, and whether you can read the screen from the playing position. Below is each of those, measured against what the makers actually put in writing.
±1
Cents of accuracy, published by Korg. Two brands here publish no figure at all.
Korg
Wanting the numbers published before you buy
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Stock photo of the product type, not this model. We publish no product photography we cannot source.
±1 cent, 24 hours of battery, 17 grams — and all three are published.
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Ranked on the specifications each maker actually publishes, on what they refuse to publish, and on what the thing costs today. Tap any row for the full write-up, including who should skip it.
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 01 | KorgKorg Pitchclip 2 (PC-2) | Best published specs | 8.8 | Check price on Amazon |
| 02 | SnarkSnark ST-8 Super Tight Clip-On Chromatic Tuner | Easiest to read | 8.6 | Check price on Amazon |
| 03 | D'AddarioD'Addario Micro Headstock Tuner (PW-CT-12) | Best hidden on the headstock | 8.5 | Check price on Amazon |
| 04 | KorgKorg Pitchclip 2+ (PC2PLUS) | Finest resolution | 8.4 | Check price on Amazon |
| 05 | PetersonPeterson StroboClip HD | Buy-once upgrade | 8.9 | Check price on Amazon |
| 06 |  BossBoss TU-3 Chromatic Tuner pedal | Best for a pedalboard | 8.7 | Check price on Amazon |
Scores are ours and editorial. They are never published as review or rating markup, because we have not played these instruments — here is how we pick.
Clip-on tuners for acoustic guitar ranked on what each maker publishes — and on which ones publish nothing.
Best for acoustic
Korg Pitchclip 2 (PC-2)
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The three tuner types compared on sensing method, cost of ownership and where each one fails. The sensing method is the whole story.
A guide to the Snark clip-on range: what the model numbers mean, what is published about each, and the accuracy figure that is not.
Step-by-step tuning with a clip-on, including which way the peg turns, why you always approach the note from below, and what to do when the tuner shows the wrong letter.
Clip-on tuners read vibration through a clamp on the headstock. They are cheap, they work in noise, they work on any instrument, and they are what almost every beginner should buy. The entire top of this page is clip-ons for that reason.
Pedal tuners sit in the signal chain between an electric guitar and an amp, and mute the output while you tune. They are excellent and they are irrelevant unless you already own an amp, a cable and somewhere to put a pedal. See clip-on vs pedal vs app for the full comparison.
Phone apps use the microphone, which means they work in a silent room and fail in a real one. They are free, so there is no reason not to have one as a backup — but a microphone tuner is a fundamentally worse tool than a vibration sensor, and the difference shows up the first time you tune anywhere other than your bedroom.
A cent is one hundredth of a semitone. Human ears begin noticing mistuning somewhere around five to ten cents on a sustained note, so a tuner accurate to ±1 cent is comfortably finer than your hearing, and a tuner accurate to ±0.1 cent is finer than your guitar's own intonation.
The useful finding is not which number is smallest. It is that Korg and Peterson publish a figure, and Snark and D'Addario do not publish one anywhere we could find. That is not proof the unpublished ones are inaccurate — it is a statement about what each company is willing to be held to. On a spec sheet, silence is information.
Almost everything here runs on a CR2032 coin cell. Korg publishes approximately 24 hours of use for the Pitchclip 2 and 18 hours for the Pitchclip 2+. That is playing time, not shelf time, and it is short enough that a spare cell belongs in the case from day one.
Rechargeable versions exist, including a rechargeable Snark. They remove the coin-cell problem and add a charging cable to remember. For a tuner that lives clipped to a headstock in a case, a coin cell and a spare is the simpler answer.
Across every brand in this category, the part that breaks is the clip. Spring-loaded plastic hinges fatigue, and the tuner ends up sliding off a headstock mid-song. D'Addario's ratchet clamp is the most convincing mechanical answer here; Peterson's metal-bodied clip is the most durable. Neither publishes a cycle rating, because nobody in this category does.
We have not tuned a guitar with any of these. Everything above comes from published specification sheets, product manuals and the pattern of what each maker is prepared to state in writing. That is a real method with real limits, and how we research sets out both.