# hellocetus vs Fortune K

The clearest difference is ads: hellocetus at none against Fortune K's shown. Fortune K's advantage is update cadence (fortnightly vs monthly). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. hellocetus sells 3 in-app purchases, starting at $1.99 per month and Fortune K sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

hellocetus ships an update monthly, Fortune K fortnightly. Both last shipped on November 5, 2026.

## The numbers

| Metric | hellocetus | Fortune K |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 77 MB | 247 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Waitcle](https://appshunter.io/developer/1824924378) | [THE RIZZ ENTERTAINMENT CO., LTD.](https://appshunter.io/developer/1896662957) |

## What reviewers say

### hellocetus

[App page](https://appshunter.io/ios/app/hellocetus-supermoon-calendar/id6759944569)

Track celestial events like supermoons, moon phases, and planet positions with this astronomy calendar. Plan observations, get local sun and moon times, and explore detailed sky data.

**Highlights:** Supermoon calendar with long-range dates, Daily moon phase and illumination tracking, Local sun and moon times, Planet position comparison, Save observation notes and reminders, Optional astronomy event alerts

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HelloCetus Premium Monthly | $1.99 | per month |
| HelloCetus Premium Yearly | $4.99 | per year |
| HelloCetus Premium | $6.99 | one-time |


### Fortune K

[App page](https://appshunter.io/ios/app/fortune-k/id6769490027)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One-Time 16P Bundle | $0.99 | one-time |
| First Reading Bundle | $1.99 | one-time |
| 40 Fortune Points | $2.99 | one-time |
| Daily Pass 30 Days | $3.99 | one-time |
| 140 Fortune Points | $9.99 | one-time |
| VIP Pass 30 Days30-day | $9.99 | one-time |
| 220 Fortune Points | $14.99 | one-time |
| 450 Fortune Points | $29.99 | one-time |
| 1000 Fortune Points | $59.99 | one-time |
| 1700 Fortune Points | $99.99 | one-time |


## Frequently asked questions

### Is hellocetus free?

hellocetus is free to download, with in-app purchases available.

### Is Fortune K free?

Fortune K is free to download, with in-app purchases available.

### Do hellocetus or Fortune K have ads?

Fortune K shows ads; hellocetus does not.

### Which is updated more often, hellocetus or Fortune K?

hellocetus ships an update monthly, and Fortune K fortnightly. Most recently, hellocetus was updated on November 5, 2026 and Fortune K on November 5, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*