K2Sonnet vs PrompX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
K2Sonnet
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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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PRO Upgrade to PrompX Pro for unlimited prompts, unlimited 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 it is canceled at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to 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 in-app purchases: K2Sonnet at none against PrompX's 2. PrompX's advantage is update cadence (every 4 days vs every 7 months). On price, ads, 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
Both are free to download. PrompX sells 2 in-app purchases, starting at $2.99 per month. K2Sonnet asks for nothing beyond the download.
K2Sonnet ships an update every 7 months, PrompX every 4 days. The most recent releases landed on October 2, 2026 and October 4, 2026 respectively.
| Parameter | K2Sonnet | PrompX |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 7 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 20 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
