SimpleTone vs Centerline
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SimpleTone
This application provides a straightforward virtual tuning fork. Simply select your desired pitch to tune your instrument. It aims to offer a no-nonsense, ad-free experience for musicians.
- Virtual tuning fork
- Pitch selection
- Ad-free experience
- Simple interface
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It's a virtual tuning fork. Select the pitch you want to tune to. That's it. I got tired of all the BS tuning apps that have ads and purchases built in. C'mon, we're better than this.
Centerline
This app offers free chromatic tuning for various instruments, identifying notes, sharps, and flats. It includes a dedicated guitar mode with automatic string detection and optional advanced tuning tools for purchase.
- Free chromatic tuning
- Dedicated guitar mode
- Automatic string detection
- Pitch history tracking
- Offline functionality
- No ads or accounts
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Tune the note you play. Play one note and see its name, whether it is flat or sharp, and where it settles. Centerline gives musicians free chromatic tuning from 62 to 800 Hz, plus a dedicated six-string Guitar mode. CHROMATIC TUNING, FREE Chromatic mode follows the nearest note, including sharps and flats. Use Simple for a clear direction, Trail to follow your pitch history, Strobe for fine adjustments, or Workbench for cents and frequency. All four views are free. WHAT YOU CAN TUNE Chromatic mode names any note from 62 to 800 Hz. That covers guitar, ukulele, violin, viola, mandolin and banjo in standard tuning, and most voices. Band instruments work at their concert tuning note. A DEDICATED GUITAR MODE Guitar mode adds automatic string detection and direct string selection. Standard tuning is free. All strings keeps track of the strings you have played. Guitar shows each string as a button: tap one to lock it, or let Auto follow the string you play. All six Guitar views are free. YOUR PREFERRED VIEW Simple is your starting view. Trail shows six seconds of pitch history and can rotate between vertical and horizontal. Centerline remembers your preferred view in each mode. OPTIONAL EXTRA TUNING TOOLS Centerline Complete is a one-time purchase for Drop D, Half step down, D standard, DADGAD, Open G, custom six-string tunings, capo settings, A4 calibration from 432 to 446 Hz, and reference tones. No subscription. Restore Purchase is available in the app. The store shows your local price. PRIVATE BY DESIGN Pitch analysis happens on your device. Centerline does not record or upload your audio. There are no ads or accounts. Optional usage analytics are off until you allow them and never include audio or pitch data. Tuning works offline. Play one note or string at a time. All strings remembers individual readings; it does not measure a chord at once. Chromatic mode supports 62 to 800 Hz and does not cover the full piano range or a bass guitar's lowest notes. Questions or feedback: wyatt@endpaperlabs.com Privacy: https://centerlinetuner.com/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: SimpleTone at none against Centerline's 1. Centerline's advantage is ratings volume (3 vs 1) and iOS requirement (17.0 vs 26.1). On price, rating, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Centerline sells 1 one-off in-app purchase. SimpleTone asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for SimpleTone against 5.0 for Centerline. Both are backed by a comparable volume of ratings — 1 and 3 respectively.
| Parameter | SimpleTone | Centerline |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (3 ratings) |
| Number of ratings | 1 | 3 — better |
| Update frequency | — | Every 5 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, Mac |
| Requires iOS | 26.1 | 17.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Evan Brass | Endpaper Labs LLC |
Customer experience
SimpleTone
Centerline
In-app purchases
SimpleTone
No in-app purchases
Centerline
- Centerline Complete$3.99









