K2Sonnet vs PrompX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
K2Sonnet
This next-generation smart assistant helps streamline your daily tasks. It offers intelligent features designed to enhance productivity and organization. Experience a smarter way to manage your workflow.
- Smart assistance
- Task management
- Workflow enhancement
- Intelligent features
- Organization tools
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K2Sonnet, Your Next-Generation Smart Assistant.
PrompX
This app helps you save, organize, and share AI prompts. Upgrade to Pro for unlimited features, including version history and password-protected sharing.
- Save AI prompts
- Organize prompts
- Share prompts
- Unlimited prompts (Pro)
- Full version history (Pro)
- Password-protected sharing (Pro)
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Your best AI prompts, ready when you need them. PrompX helps you save, organize, and reuse your AI prompts. Keep your favorites together and insert them from your PrompX keyboard without leaving the app you’re using. SAVE WHAT WORKS Build a personal library of prompts for writing, work, and creative projects. Keep your best ideas organized and easy to find. REUSE WITHOUT RETYPING Turn prompts into reusable templates. Fill in details like names, topics, and tone to adapt them to each task. KEEP PROMPTS AT YOUR FINGERTIPS Access saved prompts from your PrompX keyboard and insert them while you type. CREATE WITH AI Describe what you need and let AI help draft your next prompt. SHARE YOUR BEST PROMPTS Share prompts with a link so others can use them too. PROMPX PRO Upgrade to PrompX Pro for unlimited prompts, AI drafting, full version history, and password-protected share links. PrompX Pro is an auto-renewable subscription: • PrompX Pro Monthly — $2.99 / month • PrompX Pro Yearly — $24.99 / year Payment is charged to your Apple Account at confirmation of purchase. The subscription automatically renews unless canceled at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours before the end of the current period. You can manage or cancel your subscription in your Apple Account settings after purchase. Terms of Use (EULA): https://prompx.app/terms Privacy Policy: https://prompx.app/privacy Contact: support@prompx.app
Screenshots
Verdict
The clearest difference is rating: PrompX at 5.0 against K2Sonnet's 3.0. PrompX also leads on update cadence (every 3 days vs every 7 months). K2Sonnet's advantage is in-app purchases (none vs 2). On price, ratings volume, ads and device support 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. PrompX sells 2 in-app purchases, starting at $2.99 per month. K2Sonnet asks for nothing beyond the download.
PrompX holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively.
K2Sonnet ships an update every 7 months, PrompX every 3 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.
| Parameter | K2Sonnet | PrompX |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 2 | 2 |
| Update frequency | Every 7 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 29 MB |
| Age rating | 17+ | 4+ |
| Developer | Shanghai Jiyue Information Technology Co., Ltd. | Nexurift LLC |
In-app purchases
K2Sonnet
No in-app purchases
PrompX
- PrompX Pro Monthly$2.991 Month
- PrompX Pro Yearly$24.991 Year
