# fast_burn vs VibeCal AI

fast_burn and VibeCal AI are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. fast_burn sells 2 in-app purchases, starting at $4.99 per month and VibeCal AI sells 2 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

fast_burn ships an update every 8 days, VibeCal AI every 9 days. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | fast_burn | VibeCal AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 9 days |
| Size | 1 MB | 13 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 12+ |
| Developer | [Keiichiro Hayashida](https://appshunter.io/developer/1622333497) | [Ahmad Ahmad](https://appshunter.io/developer/1887992752) |

## What reviewers say

### fast_burn

[App page](https://appshunter.io/ios/app/fast-burn/id6768056154)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FastBurn Pro (Monthly) | $4.99 | per month |
| FastBurn Pro (Annual) | $29.99 | per year |


### VibeCal AI

[App page](https://appshunter.io/ios/app/vibecal-ai/id6771444599)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $6.99 | per 7 days |
| Premium Yearly | $39.99 | per year |


## Frequently asked questions

### Is fast_burn free?

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

### Is VibeCal AI free?

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

### Do fast_burn or VibeCal AI have ads?

Neither fast_burn nor VibeCal AI shows ads.

### Which is updated more often, fast_burn or VibeCal AI?

fast_burn ships an update every 8 days, and VibeCal AI every 9 days. Most recently, fast_burn was updated on October 28, 2026 and VibeCal AI on October 25, 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.*