K2Sonnet vs HeyAI!
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.
HeyAI!
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Meet HeyAI! — your everyday AI companion. Chat naturally, ask questions, get instant help, and spark new ideas, generate images, analyze photos — all in one place. Whether you’re writing, studying, planning, or just curious, HeyAI! is here to make your day easier and smarter.
Screenshots
Verdict
The clearest difference is update cadence: HeyAI! at every 3 days against K2Sonnet's every 7 months. On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
K2Sonnet ships an update every 7 months, HeyAI! every 3 days. The most recent releases landed on September 15, 2026 and September 10, 2026 respectively.
| Parameter | K2Sonnet | HeyAI! |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 7 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 9 MB |
| Age rating | 17+ | 9+ |
| Developer | Shanghai Jiyue Information Technology Co., Ltd. | Operationrange LTD |
In-app purchases
K2Sonnet
No in-app purchases
HeyAI!
No in-app purchases
