Comparison

Underlayer vs Palmi AI

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

Head to head
About

Underlayer

Features
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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/

About

Palmi AI

Features
Read full description

Palmi AI brings an intelligent assistant to your device. You can complete everyday Q&A, content organization, language translation, and basic image-text interaction locally. While emphasizing privacy protection, it provides a more direct and more stable user experience. Palmi AI is suitable for these scenarios: • Everyday chat and lightweight Q&A, with quick and concise answers • Different response style switching, adapting to different usage habits such as efficient, gentle, and professional • Supports Thinking Mode to provide more thorough answers for complex questions • Supports basic image input, enabling image-text Q&A with compatible models • Saves chat history locally for continued conversations and later review Why choose Palmi AI: • Emphasizes on-device operation and minimizes external transmission of sensitive content • Simple interface, ready to use upon opening • Suitable for lightweight AI assistance in study, work, and daily life Notes: • Actual generation speed and results may vary depending on device performance. Devices with no less than 6GB of memory are recommended • Image understanding and some advanced capabilities are limited by the current model capabilities. Please judge the quality of the output yourself

Screenshots

Underlayer4 screens
Palmi AI4 screens

Verdict

The call

The clearest difference is price: Underlayer at Free against Palmi AI's $2.99. Underlayer also leads on device support (3 vs 1) and iOS requirement (15.1 vs 26.1). Palmi AI's advantage is in-app purchases (none vs 1) and ads (none vs shown).

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Underlayer is free to download; Palmi AI costs $2.99 up front. Underlayer sells 1 in-app purchase, starting at $2.99 per 7 days. Palmi AI asks for nothing beyond the download.

Scorecard5 real differences Ā· 1 level
Underlayer versus Palmi AI: the parameters behind the verdict, then further details
ParameterUnderlayerPalmi AI
PriceFree — better$2.99
Update frequencyEvery 5 months—
AdsYesNo — better
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better26.1
Further details — not scored
Size169 MB1.8 GB
Age rating4+4+
DeveloperMihail Rukavishnikovę˜±é¹ 擪

In-app purchases

1 purchases

Underlayer

Subscriptions1
  • Premium$2.997 Days
None

Palmi AI

No in-app purchases

Questions

Is Underlayer free?
Underlayer is free to download, with in-app purchases available.
Is Palmi AI free?
Palmi AI costs $2.99, with no in-app purchases.
Do Underlayer or Palmi AI have ads?
Underlayer shows ads; Palmi AI does not.

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