# ScreenLines vs Calculator.io

The clearest difference is in-app purchases: Calculator.io at none against ScreenLines's 2. Calculator.io also leads on update cadence (every 2 days vs every 5 weeks). ScreenLines's advantage is ads (none vs shown) and device support (3 vs 1). On price there is nothing between them.

Both are free to download. ScreenLines sells 2 in-app purchases, starting at $2.99 per year. Calculator.io asks for nothing beyond the download.

ScreenLines ships an update every 5 weeks, Calculator.io every 2 days. The most recent releases landed on October 5, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | ScreenLines | Calculator.io |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (19 ratings)](https://appshunter.io/ios/app/screenlines/id6739783494/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 8 MB | 33 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Artem Bolotov](https://appshunter.io/developer/901756576) | [ARSIDIAN Limited Liability Company](https://appshunter.io/developer/6793037470) |

## What reviewers say

### ScreenLines

[App page](https://appshunter.io/ios/app/screenlines/id6739783494)

This utility app provides a visual guide to perfectly align screen protectors on your device. It displays a white guideline around the screen edges, helping you position the protector with precision for a flawless installation.

**Highlights:** On-screen alignment guideline, Edge-to-edge white border, Step-by-step installation instructions, Tutorial video, Preparation tips, Keeps screen awake

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Yearly | $2.99 | per year |
| Premium Forever | $6.99 | one-time |


### Calculator.io

[App page](https://appshunter.io/ios/app/calculatorio/id6814820777)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ScreenLines free?

ScreenLines is free to download, with in-app purchases available.

### Is Calculator.io free?

Calculator.io is free to download, with no in-app purchases.

### Do ScreenLines or Calculator.io have ads?

Calculator.io shows ads; ScreenLines does not.

### Which is updated more often, ScreenLines or Calculator.io?

ScreenLines ships an update every 5 weeks, and Calculator.io every 2 days. Most recently, ScreenLines was updated on October 5, 2026 and Calculator.io on October 8, 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.*