# Plan Flow Meter vs Bubble Level

The clearest difference is in-app purchases: Plan Flow Meter at none against Bubble Level's 3. Bubble Level's advantage is update cadence (every 3 weeks vs every 12 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Bubble Level sells 3 in-app purchases, starting at $4.99 per 7 days. Plan Flow Meter asks for nothing beyond the download.

Plan Flow Meter ships an update every 12 months, Bubble Level every 3 weeks. The most recent releases landed on September 17, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Plan Flow Meter | Bubble Level |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 3 weeks** |
| Size | 15 MB | 5 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [雨杨 陈](https://appshunter.io/developer/1318810771) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### Plan Flow Meter

[App page](https://appshunter.io/ios/app/plan-flow-meter/id6751126870)

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

**In-app purchases:** none


### Bubble Level

[App page](https://appshunter.io/ios/app/bubble-level-spirit-level/id6772263236)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Surface Check — Weekly | $4.99 | per 7 days |
| Shelf Alignment — Yearly | $24.99 | per year |
| Slope Gauge — Pay Once | $49.99 | one-time |


## Frequently asked questions

### Is Plan Flow Meter free?

Plan Flow Meter is free to download, with no in-app purchases.

### Is Bubble Level free?

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

### Do Plan Flow Meter or Bubble Level have ads?

Neither Plan Flow Meter nor Bubble Level shows ads.

### Which is updated more often, Plan Flow Meter or Bubble Level?

Plan Flow Meter ships an update every 12 months, and Bubble Level every 3 weeks. Most recently, Plan Flow Meter was updated on September 17, 2026 and Bubble Level on September 22, 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.*