Comparison

GHOSTLINE vs Undertone Tuner

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

GHOSTLINE

This app helps tattoo artists create perfect stencils quickly and efficiently. It offers AI-driven tools to upscale, sharpen, and customize artwork, eliminating the need for manual tracing. Print stencils at any size with advanced layout technology, saving valuable time for artists.

Highlights
  • AI-driven stencil generation
  • Artwork upscaling and sharpening
  • Customizable stencil details
  • Print-scale technology for any size
  • Reference tool for visualization
  • Editing tools (pen, eraser, ruler)
Features
Read full description

Built by tattoo artists, for tattoo artists. Tattooer-owned and operated since 2023. Ghostline turns your artwork into clean, print-ready tattoo stencils in seconds. Cut out your subject, upscale and sharpen your references, generate fully customizable stencils, and print at any size with multi-page print-scale technology. Less time tracing means more time doing what you love: making tattoos you're proud of. THE FUTURE OF TATTOOING IS HERE. CUT OUT - Lift your subject off its background in one tap - The crop follows your subject, so there's nothing to clean up by hand UPSCALE - Enhance your artwork and turn photos into picture-perfect reference - Upscale small, low-res images for sharper, cleaner reference SHARPEN - Sharpen your artwork for higher-quality stencils - Sharpen your reference so you can create better tattoos CLASSIC STENCIL - Generate fully customizable stencils in seconds - Dial in detail and intensity to your liking - Create line-based stencils, 3D value-based stencils, and everything in between PRO STENCIL - The cleanest stencils yet, powered by Ghostline tech - Adjust detail level, contours, and line weight - Blend with Classic Stencil for even more detail options - Tailor output for thermal (Thermofax) or inkjet printers - Never hand-stencil again EDIT - Pen: add extra lines or thicken areas - Eraser: remove anything you don't need - Ruler: draw perfectly straight lines - Blend: combine stencils or mix in your original artwork REFERENCE - View your stencil as an adjustable layer over your artwork while you tattoo - Slide between your artwork and your stencil to find the perfect blend - Choose stencil colors for a clearer visual guide PRINT - Multi-page printing: go as big as you want, from 1 sheet up to 16 - Multi-size: print several sizes of the same stencil on one sheet - Pinch and zoom to size your stencil exactly, from micro tattoos to full back pieces - Rotate or flip to fit your print - Choose paper size and orientation - Print with AirPrint, or save as PDF or images to print later or share to another app EXPORT - Export your stencil at any stage to Photos, Files, or any app - All tools included. No credits, no pay-per-stencil Ghostline saves you hours of tracing every week, so you can put your energy into tattoos that stand the test of time. Ghostline is a subscription-based app. Terms of Use: https://www.ghostline.app/terms Privacy Policy: https://www.ghostline.app/privacy-policy

About

Undertone Tuner

This tool helps tattoo artists and clients visualize healed tattoos by removing redness and inflammation from fresh ink. It preserves skin tone and tattoo detail, offering precise adjustments and full-resolution export.

Highlights
  • Removes redness from fresh tattoos
  • Preserves natural skin tone
  • Maintains tattoo detail
  • On-device processing
  • Full-resolution export
  • Adjustable strength and threshold
Features
Read full description

Undertone is a precision tool for tattoo artists and clients. Fresh tattoos often come with redness and inflammation that can distract from the actual work. Undertone removes that redness while keeping the skin tone and tattoo detail intact. How it works: Select or take a photo of a fresh tattoo. Paint over healthy skin near the tattoo to set a reference tone. Tap Apply. Undertone uses Lab color space analysis to neutralize redness across the image. Fine-tune with Strength, Threshold, and Brightness sliders. Use the Exclude brush to protect specific areas from correction. Save the final image at full camera resolution. Why Undertone: Maintains natural skin tone with precision color math Works with all skin tones Full-resolution export: no quality loss 100% on-device processing. Your photos are never uploaded No accounts, no ads, no tracking Pinch to zoom for detailed work Undo support and before/after toggle Works on iPhone and iPad Built by a tattoo artist, for tattoo artists.

Screenshots

GHOSTLINE4 screens
Undertone Tuner4 screens

Verdict

The call

The clearest difference is monetization model: Undertone Tuner at free against GHOSTLINE's subscription. Undertone Tuner also leads on review sentiment (100% vs 68%) and rating (5.0 vs 4.6). GHOSTLINE's advantage is ratings volume (354 vs 2). On price, update cadence, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. GHOSTLINE sells 2 in-app purchases, starting at $5.99 per month and Undertone Tuner sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Undertone Tuner holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: GHOSTLINE has 354 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 68% of GHOSTLINE's written reviews are positive against 100% of Undertone Tuner's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
GHOSTLINE versus Undertone Tuner: the parameters behind the verdict, then further details
ParameterGHOSTLINEUndertone Tuner
PriceFreeFree
Rating4.6 (354 ratings)5.0 (2 ratings) — better
Positive reviews68.0% of reviews100.0% of reviews — better
Number of ratings354 — better2
Update frequencyMonthlyMonthly
AdsNoNo
In-app purchasesYesYes
MonetizationSubscriptionFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size37 MB31 MB
Age rating4+4+
DeveloperGhostline, Inc.Inner Circle

Customer experience

GHOSTLINE

All ratings354 ratings
Positive89.5%
Neutral2.5%
Negative7.9%
Written reviews50 reviews
Positive68.0%
Neutral6.0%
Negative26.0%

Undertone Tuner

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

GHOSTLINE

Reported bugs

5 issues
  • Quarter inch gaps appearing in stencil output
  • App loses important design details in conversion
  • Emphasizes irrelevant details over important ones
  • Inconsistent stencil quality on complex designs
  • Limited customization options for stencil output

Requested features

12 requests
  • One-time purchase option instead of subscription
  • Lower subscription pricing ($6/month considered too high)
  • Lifetime subscription option under $100
  • JPEG file format export option
  • Save reference image as separate file
Show 7 more
  • Reference overlay in edit mode to see original design
  • Pinch zoom in/out functionality
  • Redo button for edits
  • Bookmark pen sizes for quick toggling
  • Background removal tool
  • Ruler/grid overlay option
  • Ability to remove white background from images

Undertone Tuner

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

GHOSTLINE

Subscriptions2
  • Ghostline Unlimited Access7 Days trial$5.991 Month
  • Ghostline Unlimited Access7 Days trial$59.991 Year
2 purchases

Undertone Tuner

One-time2
  • Continue Support$4.99
  • Sustain Support$12.99

Questions

Is GHOSTLINE free?
GHOSTLINE is free to download, with in-app purchases available.
Is Undertone Tuner free?
Undertone Tuner is free to download, with in-app purchases available.
Which has better reviews, GHOSTLINE or Undertone Tuner?
Undertone Tuner is rated higher. GHOSTLINE averages 4.6 out of 5 from 354 ratings, while Undertone Tuner averages 5.0 from 2 ratings.
Do GHOSTLINE or Undertone Tuner have ads?
Neither GHOSTLINE nor Undertone Tuner shows ads.
Which is updated more often, GHOSTLINE or Undertone Tuner?
GHOSTLINE ships an update monthly, and Undertone Tuner monthly. Most recently, GHOSTLINE was updated on October 25, 2026 and Undertone Tuner on October 24, 2026.

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