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Compare iPhone layouts by CSS viewport width, not by the screenshot file’s pixel dimensions. Capture the same page, content and interaction state at a representative set of widths—including just below and above your CSS breakpoints—then review each capture against a baseline made in the same browser environment.
Choose widths that expose responsive changes
CSS media queries respond to the browser viewport, expressed in CSS pixels (often described as points in Apple’s device specifications). A screenshot’s physical pixel dimensions are a separate measurement: display scale affects how many image pixels represent each CSS pixel. For example, Apple lists iPhone 13 mini at 360 × 780 points and 1080 × 2340 pixels at 3x; iPhone 16 at 393 × 852 points and 1179 × 2556 pixels at 3x; iPhone 16 Plus at 430 × 932 points and 1290 × 2796 pixels at 3x; and iPhone 17 Pro Max at 440 × 956 points and 1320 × 2868 pixels at 3x. These are portrait dimensions; check Apple’s current device table for the model you are targeting.
| # | Preview | Product | Price | |
|---|---|---|---|---|
| 1 |
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Apple iPhone 14, 128GB, Midnight - Unlocked (Renewed) | $300.00 | Buy on Amazon |
| 2 |
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Apple iPhone 16, 128GB, Pink - Unlocked (Renewed) | $584.00 | Buy on Amazon |
| 3 |
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Apple iPhone 15, 128GB, Black - Unlocked (Renewed) | $409.00 | Buy on Amazon |
| 4 |
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Apple iPhone 13, 128GB, Midnight - Unlocked (Renewed) | $262.00 | Buy on Amazon |
| 5 |
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Apple iPhone 16e, 128GB, Black - Unlocked (Renewed) | $388.00 | Buy on Amazon |
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Do not infer the CSS viewport from an image’s dimensions alone. Verify the viewport configured in the browser or test tool. A practical test set covers the narrowest and widest widths your site supports, plus widths immediately below and above breakpoints that change navigation, columns, image sizing or fixed controls. Test landscape too if it is part of your supported experience. This breakpoint-centered sampling is a useful strategy, not a universal required device matrix.
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For a useful baseline comparison, hold the variables that are not under test steady. Use the same route, content, orientation, browser, interaction state and capture settings for each run. Wait for the same page condition before capturing, and save a separate reference for each viewport where the responsive layout should differ. A difference image can flag a change, but it cannot tell you by itself whether that change is a defect, an intentional design update or an environmental variation.
#1 Best Overall
- This phone is unlocked and compatible with any carrier of choice on GSM and CDMA networks (e.g. AT&T, T-Mobile, Sprint, Verizon, US Cellular, Cricket, Metro, Tracfone, Mint Mobile, etc.).
- Please check with your carrier to verify compatibility.
- The device does not come with headphones or a SIM card. It does include a generic (Mfi certified) charging cable.
- Tested for battery health and guaranteed to have a minimum battery capacity of 80%.
Inspect layouts manually in Safari
Safari Responsive Design Mode is suited to quick inspection and breakpoint exploration. Apple describes it as a way to test media queries and dynamic styles across screen sizes; it also lets you preview viewport dimensions and display pixel ratio.
- Open the page in Safari on a Mac.
- Enable Safari’s Develop menu if it is not already visible, then choose Develop > Enter Responsive Design Mode.
- Select a viewport preset or set the dimensions you want to inspect.
- Check the same page state at each target width. Resize around any visible transition to identify the width where the layout changes.
- Use Web Inspector to investigate the relevant styles and layout when something looks wrong.
Apple’s guidance is direct: “Use Responsive Design Mode to test your media queries and other dynamic styles to ensure your webpages look great on any screen.” See Safari Developer Documentation: Responsive Design Mode.
Rank #2
- 6.1" Super Retina XDR OLED, HDR10, Dolby Vision, 1000nits (typ), 2000nits (HBM), 2556x1179px at 460ppi, 3561mAh Battery
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- Rear camera: 48MP, f/1.6, wide + 12MP, f/2.2, ultrawide, Front Camera: 12MP, f/1.9, wide, iOS 18, upgradable to iOS 18.5
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- Unlocked for freedom to choose your carrier. Compatible with both GSM & CDMA networks. The phone is unlocked to work with all GSM Carriers & CDMA Carriers Including AT&T, T-Mobile, Verizon, Sprint., Etc.
Automate screenshot comparisons with Playwright
For repeatable regression checks, Playwright Test’s toHaveScreenshot() can create reference screenshots on an initial run and compare later captures against them. Configure the viewport for each test and keep a distinct baseline for each responsive layout you expect. Playwright device profiles can also represent settings such as user agent, screen size, viewport and touch capability; emulation is a layout check, not proof that every behavior matches a physical iPhone.
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Rank #3
- 6.1inch Super Retina XDR display. Aluminum with color-infused glass back. Ring/Silent switch
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- Emergency SOS via satellite. Crash Detection. Roadside Assistance via satellite
- Up to 26 hours video playback. USB C, Supports USB 2. Face ID
import { test, expect } from '@playwright/test';
test('mobile page matches its visual baseline', async ({ page }) => {
await page.setViewportSize({ width: 393, height: 852 });
await page.goto('https://example.com');
await expect(page).toHaveScreenshot('mobile-393x852.png');
});Use a viewport set that matches the CSS width you intend to test. The example’s 393 × 852 dimensions correspond to the portrait point dimensions Apple lists for iPhone 16; this does not set the image’s physical pixel size. To test another width, change the viewport and give that layout its own baseline. Adapt the navigation URL to your site and add the project’s usual setup, such as its Playwright configuration and test command.
Run baseline creation and comparisons with a consistent browser and host environment. Playwright warns that rendering can vary with operating system, browser version, settings, hardware, power source and headless mode. Review the changed region before accepting an updated baseline; do not treat every pixel difference as a confirmed regression. See Playwright’s screenshot comparison documentation and device emulation documentation.
Rank #4
- This pre-owned product is not Apple certified, but has been professionally inspected, tested and cleaned by Amazon-qualified suppliers.
- There will be no visible cosmetic imperfections when held at an arm’s length.
- This product is eligible for a replacement or refund within 90 days of receipt if you are not satisfied.
- Product may come in generic Box.
Pick the right method for the question
| Method | Best for | Tradeoff |
|---|---|---|
| Safari Responsive Design Mode | Hands-on inspection and breakpoint exploration in Safari | Human-driven; it does not by itself maintain an automated baseline history. |
| Playwright screenshot assertions | Repeatable automated captures and regression checks | Needs a controlled test environment and reviewed baselines. |
| Physical iPhone validation | Investigating behavior that may depend on a real device or browser | Requires device coverage and setup; the cited documentation does not prescribe a device lab or quantify emulator fidelity. |
Emulated widths are useful for responsive layout coverage. If a bug appears device-specific or depends on real browser conditions, validate it on the relevant physical iPhone rather than assuming emulation proves device identity.
Check viewport configuration when widths seem wrong
If a mobile page behaves as though it has a much wider layout viewport, inspect the page’s viewport configuration and test its actual behavior in Safari. Apple’s archived guidance discusses width=device-width for iOS-specific web applications; it should not be turned into a blanket prescription for every modern responsive site. Use the page’s requirements and current Safari behavior to decide whether its viewport meta tag is correct. The archived reference is Apple’s Safari HTML Reference.
Best Value
- 6.1" Super Retina XDR OLED, HDR10, 800 nits (HBM), 1200 nits (peak), 2532x1170px at 460ppi, 4005mAh Battery
- 8GB RAM, Apple A18 6-core CPU (2 performance + 4 efficiency cores), Apple GPU 4-core, 16‑core Neural Engine
- Rear camera: 48MP, f/1.6, wide, Front Camera: 12MP, f/1.9, wide, iOS 18.3.1, upgradable to iOS 18.5
- Connectivity: Global 4G LTE, Sub-6 GHz 5G, LTE, Wi-Fi 6, Bluetooth 5.3, NFC, USB-C, Wireless Charging (7.5W). (does not have mmWave 5G or MagSafe or physical SIM card) - Dual eSIM Only
- Unlocked for freedom to choose your carrier. Compatible with both GSM & CDMA networks. The phone is unlocked to work with all GSM Carriers & CDMA Carriers Including AT&T, T-Mobile, Verizon, Straight Talk., Etc.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. A single GET request can capture a URL as an image or PDF; for this comparison, set the same target URL and viewport parameters for each run. See the ScreenshotNeo API documentation.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpScreenshotNeo removes cookie and consent banners, newsletter popups and chat widgets before capture; each step can be turned off. Bot checks, blank pages and failed loads are never billed, and responses identify the page verdict and billing status in headers. Its MCP server provides screenshot tools for AI agents. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000 shots.
Sign up for 1,000 free screenshots a month—no card required.
Quick Recap
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