Comparison

Semantic Segmentation vs Underlayer

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

Head to head
About

Semantic Segmentation

Features
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Recognize objects in an image and automatically divide the area.

About

Underlayer

Features
Read full description

UNDERLAYER - STEGANOGRAPHY MADE SIMPLE Transform ordinary images into secret carriers. Hide confidential messages invisibly within photos and share them through any messenger without raising suspicion. KEY FEATURES: HIDE SECRETS • Embed text messages invisibly into any image • Two encoding modes: Hidden (invisible pixels) and Open (colored frame) • Open mode survives messenger compression (Telegram, WhatsApp, etc.) • Share processed images directly or save to gallery REVEAL MESSAGES • Extract hidden text from steganographic images • Automatic detection of encoding method • Works with images received through messengers • Share intent support - open images directly from gallery WHY UNDERLAYER? • Simple & Intuitive - No cryptography knowledge required • Messenger-Friendly - Open mode designed for compressed sharing • Privacy First - All processing happens locally on your device • Universal - Works with JPG, PNG, WebP formats • No Account Required - Start using immediately USE CASES • Private communication through public channels • Watermarking images with hidden ownership data • Secure note-taking in plain sight • Educational tool for learning steganography • Fun way to send secret messages to friends SECURITY & PRIVACY • No internet connection required for processing • Your messages never leave your device • No data collection or tracking • Complete control over your secrets PREMIUM FEATURES • No banner ads at the bottom • No interstitial ad interruptions • Process unlimited images without ad breaks HOW IT WORKS 1. Select any image from your gallery 2. Enter your secret message 3. Choose encoding mode (Hidden or Open) 4. App embeds message into image pixels 5. Share through messengers or save locally 6. Recipient opens image in Underlayer to reveal message ENCODING MODES EXPLAINED HIDDEN MODE • Message embedded invisibly in image pixels • Completely undetectable to human eye • Best for uncompressed image sharing • Lost when image is compressed by messengers OPEN MODE • Message encoded as colored frame border • Visible as decorative edge around image • Survives Telegram, WhatsApp compression • Recommended for messenger sharing INTERNATIONAL • Available in English and Russian • More languages coming soon • Automatic language detection Whether you're a privacy enthusiast, security professional, or just curious about steganography - Underlayer makes it accessible to everyone. Download now and start hiding your secrets in plain sight! Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Semantic Segmentation1 screens
Underlayer4 screens

Verdict

The call

The clearest difference is in-app purchases: Semantic Segmentation at none against Underlayer's 1. Semantic Segmentation also leads on update cadence (every 11 days vs every 5 months). Underlayer's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.7.2). On price and ads 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

Both are free to download. Underlayer sells 1 in-app purchase, starting at $2.99 per 7 days. Semantic Segmentation asks for nothing beyond the download.

UpkeepUpdate frequency

Semantic Segmentation ships an update every 11 days, Underlayer every 5 months. The most recent releases landed on August 4, 2026 and September 12, 2026 respectively.

Scorecard4 real differences · 2 level
Semantic Segmentation versus Underlayer: the parameters behind the verdict, then further details
ParameterSemantic SegmentationUnderlayer
PriceFreeFree
Update frequencyEvery 11 days — betterEvery 5 months
AdsYesYes
In-app purchasesNo — betterYes
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS17.7.215.1 — better
Further details — not scored
Size159 MB169 MB
Age rating4+4+
DeveloperHideaki UchikoshiMihail Rukavishnikov

In-app purchases

None

Semantic Segmentation

No in-app purchases

1 purchases

Underlayer

Subscriptions1
  • Premium$2.997 Days

Questions

Is Semantic Segmentation free?
Semantic Segmentation is free to download, with no in-app purchases.
Is Underlayer free?
Underlayer is free to download, with in-app purchases available.
Do Semantic Segmentation or Underlayer have ads?
Both Semantic Segmentation and Underlayer show ads.
Which is updated more often, Semantic Segmentation or Underlayer?
Semantic Segmentation ships an update every 11 days, and Underlayer every 5 months. Most recently, Semantic Segmentation was updated on August 4, 2026 and Underlayer on September 12, 2026.

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