OnDevice AI vs Prysm AI
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
OnDevice AI
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OnDevice AI - Private AI Assistant OnDevice AI brings artificial intelligence directly to your iPhone without requiring an internet connection. All processing happens on your device using Apple's on-device intelligence framework. How It Works Chat with an AI assistant that runs entirely on your iPhone. Your conversations are never sent to servers, uploaded to the cloud, or stored anywhere except your device. Works in airplane mode, underground, or anywhere without signal. Core Features Multiple AI personalities: Professional, Creative, Technical, and Friendly modes Complete conversation history stored locally on your device Export conversations as text files Works without WiFi, cellular data, or any internet connection Powered by Apple's Foundation Models for fast, efficient processing Use Cases Perfect for flights, subway commutes, international travel without roaming, rural areas with poor coverage, or when you need absolute privacy for sensitive questions. Students can study offline, professionals can brainstorm confidentially, and travelers can get help without data charges. Pricing Free tier includes 10 messages daily. Pro upgrade unlocks unlimited messages and full conversation history for $29.99 one-time purchase. Requirements iOS 26.0 or later. Requires iPhone with Apple Intelligence support.
Prysm AI
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Prysm AI brings the power of advanced language models directly to your Apple devices, with a focus on privacy, performance, and ease of use. KEY FEATURES: โ Private & Secure All processing happens on-device using Apple's Foundation Models framework. Your conversations never leave your device, ensuring complete privacy. โ Smart Conversations Engage in natural, contextual conversations with an AI that understands nuance and can help with a wide variety of tasks. โ Creative Tools Generate structured content including recipes, travel itineraries, book summaries, and product reviews with specialized templates. โ Adaptive Interface Beautiful, native experience optimized for iPhone, iPad, and Mac with support for light/dark modes and customizable themes. โ No Subscription Required Core features are completely free with no ads or tracking. Optional premium features enhance your experience. โ Examples Library Get inspired with curated prompts and templates across categories like productivity, creativity, learning, and entertainment. PERFECT FOR: โข Students and educators โข Writers and content creators โข Developers and designers โข Business professionals โข Anyone curious about AI Prysm AI respects your privacy while delivering powerful AI capabilities. No account required, no data collection, just pure AI assistance when you need it. Built with SwiftUI and powered by Apple Intelligence, Prysm AI represents the future of on-device AI assistance.
Screenshots
Verdict
The clearest difference is in-app purchases: Prysm AI at none against OnDevice AI's 1. Prysm AI also leads on update cadence (every 2 days vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. OnDevice AI sells 1 one-off in-app purchase. Prysm AI asks for nothing beyond the download.
OnDevice AI ships an update every 6 months, Prysm AI every 2 days. Both last shipped on October 30, 2026.
| Parameter | OnDevice AI | Prysm AI |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 months | Every 2 days โ better |
| Ads | No | No |
| In-app purchases | Yes | No โ better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 26.0 |
| Further details โ not scored | ||
| Size | 6 MB | 2 MB |
| Age rating | 12+ | 4+ |
| Developer | Florin Valentin Micu | Andrew Bierman |
In-app purchases
OnDevice AI
- Unlock Pro Features$29.99
Prysm AI
No in-app purchases









