# Green Slope vs PerfectLine

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.

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.

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.

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.

## The numbers

| Metric | Green Slope | PerfectLine |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/green-slope/id6449557935/reviews)** | [3.7 (6 ratings)](https://appshunter.io/ios/app/perfectline-putting-simulator/id6476920264/reviews) |
| Number of ratings | 3 | **6** |
| Positive reviews | **100.0% of reviews** | 87.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 7 MB | 115 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gordon Thomson](https://appshunter.io/developer/1460719625) | [LineMatics Inc.](https://appshunter.io/developer/1688668080) |

## What reviewers say

### Green Slope

[App page](https://appshunter.io/ios/app/green-slope/id6449557935)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### PerfectLine

[App page](https://appshunter.io/ios/app/perfectline-putting-simulator/id6476920264)

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+)

**In-app purchases (20)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium_Monthly | $9.90 | per month |
| Pro_Monthly | $19.90 | per month |
| Coach_monthly | $39.90 | per month |
| CoachMax_monthly | $79.90 | per month |
| Premium_Yearly | $99.00 | per year |
| Pro_Yearly | $199.00 | per year |
| Coach Yearly | $399.00 | per year |
| CoachMax Yearly | $799.00 | per year |
| $1 후원 | $1.00 | one-time |
| 100 Credits | $1.99 | one-time |
| 1-Day Membership (Premium) | $2.99 | one-time |
| $5 후원 | $5.00 | one-time |
| 1-Day Membership (Pro) | $5.99 | one-time |
| 550 Credits | $9.99 | one-time |
| $10 후원 | $10.00 | one-time |
| $20 후원 | $20.00 | one-time |
| 3300 Credits | $49.99 | one-time |
| $50 후원 | $50.00 | one-time |
| 10000 Credits | $99.99 | one-time |
| $100 후원 | $100.00 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*