# 瞬速！燃費計算 vs SEIBI

The clearest difference is update cadence: SEIBI at every 2 days against 瞬速！燃費計算's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 瞬速！燃費計算 sells 1 in-app purchase, starting at $1.99 per month and SEIBI sells 1 in-app purchase, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

瞬速！燃費計算 ships an update every 3 months, SEIBI every 2 days. The most recent releases landed on October 5, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 瞬速！燃費計算 | SEIBI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 days** |
| Size | 7 MB | 37 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shun Isayama](https://appshunter.io/developer/1578976556) | [Daisuke Hanano](https://appshunter.io/developer/945362806) |

## What reviewers say

### 瞬速！燃費計算

[App page](https://appshunter.io/ios/app/id6727004599)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告非表示（初週無料） | $1.99 | per month |


### SEIBI

[App page](https://appshunter.io/ios/app/seibi/id6737248176)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月額会員 | $0.99 | per month |


## Frequently asked questions

### Is 瞬速！燃費計算 free?

瞬速！燃費計算 is free to download, with in-app purchases available.

### Is SEIBI free?

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

### Do 瞬速！燃費計算 or SEIBI have ads?

Neither 瞬速！燃費計算 nor SEIBI shows ads.

### Which is updated more often, 瞬速！燃費計算 or SEIBI?

瞬速！燃費計算 ships an update every 3 months, and SEIBI every 2 days. Most recently, 瞬速！燃費計算 was updated on October 5, 2026 and SEIBI on October 9, 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.*