PixelMask vs Underlayer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PixelMask
This app allows you to hide secret messages or confidential data within images using advanced steganography. It offers multiple methods to ensure your data remains invisible and secure, even under analysis. Protect your privacy and transmit information discreetly.
- Invisible data embedding
- Multiple steganography methods
- Simple encoding and decoding
- Secure data transmission
- Preserves image quality
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PixelMask is a reliable tool for safeguarding your personal information using advanced steganography techniques. With an intuitive interface and powerful technology, PixelMask allows you to embed secret messages or confidential data into any image. Key Features: - Invisible Data Embedding: Protect your privacy by embedding data into images using the least significant bit (LSB) method. The changes remain invisible to the naked eye. - Multiple Steganography Methods: Utilize various embedding strategies such as Sequential Color Cycling (SCC) and uniform distribution to keep your data hidden, even under statistical analysis. - Simplicity and Security: Easily encode and decode information with just a few taps. Your data remains secure, invisible, and accessible only to those with the decryption key. - Wide Range of Applications: Perfect for securely transmitting personal messages, protecting intellectual property, or storing confidential data. - High Quality: PixelMask preserves the integrity of your images, ensuring protection without loss of visual quality. --- PixelMask | Premium By purchasing a subscription, you gain access to all paid features of PixelMask. The subscription automatically renews, and payment is charged monthly or annually, with the price depending on the selected plan. The subscription automatically renews until it is canceled, at least 24 hours before the end of the current period. Payment for renewal will be charged to your account within 24 hours prior to the end of the current period. You can manage and cancel subscriptions and turn off auto-renewal by going to your App Store account settings after purchase. Any unused portion of a free trial period will be forfeited when the user purchases a subscription to the product. - Terms of Service: https://SosinVitalii.com/terms-conditions - Privacy Policy: https://SosinVitalii.com/privacy-policy
Underlayer
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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
Verdict
The clearest difference is ads: PixelMask at none against Underlayer's shown. PixelMask also leads on update cadence (every 2 months vs every 5 months). Underlayer's advantage is device support (3 vs 1). On price, in-app purchases and iOS requirement 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
Both are free to download. PixelMask sells 4 in-app purchases, starting at $1.99 per month and Underlayer sells 1 in-app purchase, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.
PixelMask ships an update every 2 months, Underlayer every 5 months. The most recent releases landed on September 18, 2026 and September 12, 2026 respectively.
| Parameter | PixelMask | Underlayer |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months — better | Every 5 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Subscription | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 12 MB | 169 MB |
| Age rating | 4+ | 4+ |
| Developer | Vitalii Sosin | Mihail Rukavishnikov |
In-app purchases
PixelMask
- Monthly Premium Access$1.991 Month
- Yearly Premium Access7 Days trial$9.991 Year
- Purchase Premium Access$9.99
- Purchase Premium Access$49.99
Underlayer
- Premium$2.997 Days








