GUIDES / INDEX
Know the rules
before the review does.
23 guides on shipping software: store specs, formats, accessibility and the syntax people copy wrong. Written from our own submissions.
SIZES
App Store screenshot sizes, 2026
Every required and optional slot, and which uploads double for others.
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SIZES
Play Store asset sizes, 2026
Screenshots, the feature graphic, and the icon Google actually wants.
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REVIEW
Why screenshots get rejected
The rules reviewers actually enforce, with real rejection examples.
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ASO
Screenshot copywriting that converts
What the first two screenshots must say, and what to leave out.
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ICONS
App icon sizes for iOS and Android
The full matrix, adaptive icons, and the alpha channel trap.
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CHECKLIST
Store listing checklist
Everything to verify before you press submit, both stores.
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SIZES
iPhone screenshot sizes, per device
One required size, three optional, and how to capture natively.
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SIZES
iPad screenshot sizes
13 inch and 12.9 inch specs, landscape rules, iPad only gotchas.
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REVIEW
Why app submissions get rejected
The guideline numbers that come back most often.
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ASO
ASO fundamentals
Which text fields each store indexes, and what to change first.
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TESTING
A/B testing store listings
What is worth testing, and how to read the result.
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LOCALE
Localizing screenshots
Which markets pay off, and a workflow that scales.
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VIDEO
App preview video specs
Length, resolution and the poster frame.
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WEB
OG image sizes that work everywhere
One file, every platform, and the safe area to keep text inside.
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WEB
Favicon formats explained
Which files a browser actually asks for, and why .ico survives.
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COLOR
Choosing an accessible palette
Contrast ratios, AA vs AAA, and pairing colors that pass.
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FORMATS
HEIC on Windows, fixed
Why iPhone photos will not open, and three ways to convert them.
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FORMATS
GIF vs WebP vs APNG
File size, quality and compatibility, with real numbers.
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