# Wattmax SmartCharge vs Drive by GridFlow

The clearest difference is ads: Wattmax SmartCharge at none against Drive by GridFlow's shown. Drive by GridFlow's advantage is update cadence (monthly vs every 3 months) and iOS requirement (12.4 vs 16.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Wattmax SmartCharge ships an update every 3 months, Drive by GridFlow monthly. The most recent releases landed on September 7, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Wattmax SmartCharge | Drive by GridFlow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Monthly** |
| Size | 96 MB | 95 MB |
| Requires iOS | 16.6 | **12.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Wattmax SmartCharge](https://appshunter.io/developer/1822294803) | [EatHealthy](https://appshunter.io/developer/1749840979) |

## What reviewers say

### Wattmax SmartCharge

[App page](https://appshunter.io/ios/app/wattmax-smartcharge/id6747673557)

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

**In-app purchases:** none


### Drive by GridFlow

[App page](https://appshunter.io/ios/app/drive-by-gridflow/id6752283082)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Wattmax SmartCharge free?

Wattmax SmartCharge is free to download, with no in-app purchases.

### Is Drive by GridFlow free?

Drive by GridFlow is free to download, with no in-app purchases.

### Do Wattmax SmartCharge or Drive by GridFlow have ads?

Drive by GridFlow shows ads; Wattmax SmartCharge does not.

### Which is updated more often, Wattmax SmartCharge or Drive by GridFlow?

Wattmax SmartCharge ships an update every 3 months, and Drive by GridFlow monthly. Most recently, Wattmax SmartCharge was updated on September 7, 2026 and Drive by GridFlow on September 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.*