Comparison

Green Slope vs PerfectLine

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

Head to head
About

Green Slope

This training aid helps golfers visualize and understand putts by measuring green slope and predicting break. It uses device sensors to assess orientation and attitude, then provides graphical overviews and adjustable aimpoint tables.

Highlights
  • Measures green slope
  • Predicts putt break and aimpoint
  • Adjustable aimpoint tables
  • Graphical overviews of putts
  • Uses device motion sensors
  • Configurable green speed and pin direction
Features
Read full description

"Green Slope" measures the slope and then predicts the break and aimpoint required for a putt. It's intended as a training aid, providing assistance with visualization and understanding of putts. Set the green speed, select pin direction, place the device on ground for three seconds, and read your putt. Using the internal iPhone and iPad motion sensors to assess the device orientation and attitude, the App measures slopes across and along the line of the putt. The estimated Fall Line direction and slope are then used to predict the likely break. Standard 'Aimpoint', 'Plays As', 'Fingers' and other tables are available from the menu. These can be adjusted for slopes, Stimp, past hole distance, and other parameters. The app then provides graphical overviews of selected putts with optional configurations. Since many phones have one or more camera lenses on the back preventing accurate slope measurements, Green Slope has been designed to be used with the phone is face down or face up on the green. Comprehensive help on app use is available from the menu button.

About

PerfectLine

This app provides a real-time putting line guide for golfers. It uses your device's camera to scan the green and overlay a visual guide to help improve your putting accuracy.

Highlights
  • Real-time putting line guide
  • Scan green for putting line
  • Improves putting accuracy
  • Works on iPhone 12+ and iPad (2021+)
Read full description

Scan on the green for putting line guide Best putting guide in real-time Available Devices: iPhone 12 + iPad (2021+) We use your data to track advertising performance and deliver personalized ads tailored to your interests. By downloading this app, you agree to the Terms of Use: [https://www.apple.com/legal/internet-services/itunes/dev/stdeula/](https://www.apple.com/legal/internet-services/itunes/dev/stdeula/)

Screenshots

Green Slope4 screens
PerfectLine4 screens

Verdict

The call

The clearest difference is price: PerfectLine at Free against Green Slope's $9.99. Green Slope's advantage is rating (5.0 vs 3.7) and in-app purchases (none vs 20). On ratings volume, update cadence, device support and iOS requirement 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

PerfectLine is free to download; Green Slope costs $9.99 up front. PerfectLine sells 20 in-app purchases, starting at $9.90 per month. Green Slope asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Green Slope holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 6 respectively. Written reviews point the same way: 100% of Green Slope's written reviews are positive against 88% of PerfectLine's.

UpkeepUpdate frequency

Green Slope ships an update every 2 weeks, PerfectLine every 9 days. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 4 level
Green Slope versus PerfectLine: the parameters behind the verdict, then further details
ParameterGreen SlopePerfectLine
Price$9.99Free — better
Rating5.0 (3 ratings) — better3.7 (6 ratings)
Positive reviews100.0% of reviews — better87.9% of reviews
Number of ratings36 — better
Update frequencyEvery 2 weeksEvery 9 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.616.0 — better
Further details — not scored
Size7 MB115 MB
Age rating4+4+
DeveloperGordon ThomsonLineMatics Inc.

Customer experience

Green Slope

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

PerfectLine

All ratings6 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews33 reviews
Positive87.9%
Neutral0.0%
Negative12.1%

In-app purchases

None

Green Slope

No in-app purchases

20 purchases

PerfectLine

Subscriptions8
  • Premium_Monthly3 Days trial$9.901 Month
  • Pro_Monthly3 Days trial$19.901 Month
  • Coach_monthly$39.901 Month
Show 5 more
  • CoachMax_monthly$79.901 Month
  • Premium_Yearly7 Days trial$99.001 Year
  • Pro_Yearly3 Days trial$199.001 Year
  • Coach Yearly$399.001 Year
  • CoachMax Yearly$799.001 Year
One-time12
  • $1 후원$1.00
  • 100 Credits$1.99
  • 1-Day Membership (Premium)$2.99
Show 9 more
  • $5 후원$5.00
  • 1-Day Membership (Pro)$5.99
  • 550 Credits$9.99
  • $10 후원$10.00
  • $20 후원$20.00
  • 3300 Credits$49.99
  • $50 후원$50.00
  • 10000 Credits$99.99
  • $100 후원$100.00

Questions

Is Green Slope free?
Green Slope costs $9.99, with no in-app purchases.
Is PerfectLine free?
PerfectLine is free to download, with in-app purchases available.
Which has better reviews, Green Slope or PerfectLine?
Green Slope is rated higher. Green Slope averages 5.0 out of 5 from 3 ratings, while PerfectLine averages 3.7 from 6 ratings.
Do Green Slope or PerfectLine have ads?
PerfectLine shows ads; Green Slope does not.
Which is updated more often, Green Slope or PerfectLine?
Green Slope ships an update every 2 weeks, and PerfectLine every 9 days. Most recently, Green Slope was updated on October 24, 2026 and PerfectLine on October 30, 2026.

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