OnePrompt vs DeviceAI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OnePrompt
This app helps you create effective AI prompts without needing to learn prompt engineering. Simply describe your needs in plain language, answer a few questions, and get a perfectly crafted prompt for popular AI models.
- AI prompt generation from plain language
- No prompt engineering required
- Smart questioning for prompt refinement
- Optimized output for ChatGPT, Claude, Gemini
- 14 ready-to-use templates
- Works with existing AI tools
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OnePrompt turns what you're trying to say into a prompt that actually works. No prompt engineering. No trial and error. Just tell OnePrompt what you need — it asks a few smart questions and builds the prompt for you. HOW IT WORKS 1. Describe what you need in plain language 2. Answer a few quick questions 3. Copy your prompt and paste it into ChatGPT, Claude, or Gemini BUILT FOR REAL USE • 14 ready-to-use templates: emails, travel plans, recipes, cover letters, study guides, and more • Optimized output for ChatGPT, Claude, and Gemini • Works with whatever AI you already use — no account needed WHO IT'S FOR If you've ever stared at a blank ChatGPT box and didn't know what to type — this is for you. OnePrompt is designed for people who want better AI results without learning how to prompt. WHAT YOU CAN BUILD • Professional emails that hit the right tone • Travel itineraries tailored to your trip • Cover letters that stand out • Study plans and research briefs • Recipes based on what you have • Social media posts, blog outlines, meeting agendas, and more
DeviceAI
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Run powerful AI models entirely on your iPhone — no internet, no subscriptions, no data sharing. DeviceAI is a privacy-first chat app that runs large language models (LLMs) completely on your device using Apple's Metal GPU acceleration. Your conversations never leave your phone. KEY FEATURES • 100% On-Device Processing — All AI inference happens locally. Zero cloud dependency. • 60+ Open-Source Models — Choose from Llama, Qwen, Phi, Mistral, DeepSeek and more • Full Privacy — No data collection, no analytics, no telemetry. Your chats stay on your device. • Offline-First — Works perfectly without internet after model download • Streaming Responses — See AI responses appear in real-time • Reasoning Models — Support for advanced thinking models like DeepSeek R1 • Markdown & Code — Beautiful formatting with syntax highlighting • Customizable — Adjust system prompts, temperature, and generation parameters • Conversation History — All chats saved locally with Isar database PERFECT FOR • Privacy advocates who want AI without cloud exposure • Travelers and remote workers who need offline AI assistance • Developers testing open-source models • Students wanting unlimited, free AI tutoring • Anyone who values data sovereignty TECHNICAL DETAILS • Powered by llamadart (llama.cpp for Flutter) • Supports GGUF format models from HuggingFace • Metal GPU acceleration for fast inference (15-40 tokens/second) • Models range from 0.5B to 8B parameters • Requires iOS 16.0 or later Download models once, use forever. No subscriptions, no API keys, no compromises. Your data stays on your device. Always.
Screenshots
Verdict
The clearest difference is price: OnePrompt at Free against DeviceAI's $2.99. OnePrompt also leads on update cadence (every 5 days vs monthly). On ads, in-app purchases, device support 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
OnePrompt is free to download; DeviceAI costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
OnePrompt ships an update every 5 days, DeviceAI monthly. Both last shipped on October 31, 2026.
| Parameter | OnePrompt | DeviceAI |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 days — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 2 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | Carlos Soto | Evan Yeoh |
In-app purchases
OnePrompt
No in-app purchases
DeviceAI
No in-app purchases









