# Lumi Math Planet vs Flash Vocal

Lumi Math Planet and Flash Vocal are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support 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. Lumi Math Planet sells 1 one-off in-app purchase and Flash Vocal sells 8 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Lumi Math Planet | Flash Vocal |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 days | — |
| Size | 56 MB | 164 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Guan Feng Lai](https://appshunter.io/developer/1136144960) | [AKISTO Software](https://appshunter.io/developer/1638766096) |

## What reviewers say

### Lumi Math Planet

[App page](https://appshunter.io/ios/app/lumi-math-planet-explorer/id6778269699)

**Features:** macOS Compatibility, Family Sharing, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock the Full Galaxy | $4.99 | one-time |


### Flash Vocal

[App page](https://appshunter.io/ios/app/flash-vocal-subtraction/id6808381981)

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Family – 1 month | $3.99 | per month |
| Education – 1 month | $8.99 | per month |
| Family – 3 months | $8.99 | per 3 months |
| Family – 6 months | $14.99 | per 6 months |
| Education – 3 months | $22.99 | per 3 months |
| Family – 1 year | $22.99 | per year |
| Education – 6 months | $34.99 | per 6 months |
| Education – 1 year | $49.99 | per year |


## Frequently asked questions

### Is Lumi Math Planet free?

Lumi Math Planet is free to download, with in-app purchases available.

### Is Flash Vocal free?

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

### Do Lumi Math Planet or Flash Vocal have ads?

Neither Lumi Math Planet nor Flash Vocal shows ads.

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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.*