# Lean PlanDo Flow vs AI Email Writer | Mail Master

The clearest difference is in-app purchases: Lean PlanDo Flow at none against AI Email Writer | Mail Master's 2. AI Email Writer | Mail Master's advantage is iOS requirement (12.4 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. AI Email Writer | Mail Master sells 2 in-app purchases, starting at $4.99 per 7 days. Lean PlanDo Flow asks for nothing beyond the download.

Lean PlanDo Flow ships an update every 2 months, AI Email Writer | Mail Master every 3 months. The most recent releases landed on September 8, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Lean PlanDo Flow | AI Email Writer | Mail Master |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Size | 21 MB | 20 MB |
| Requires iOS | 15.6 | **12.4** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lean Station Pte Ltd](https://appshunter.io/developer/1211962440) | [Arda Emin Cimen](https://appshunter.io/developer/1652033405) |

## What reviewers say

### Lean PlanDo Flow

[App page](https://appshunter.io/ios/app/lean-plando-flow/id1552365163)

**Features:** macOS Compatibility

**In-app purchases:** none


### AI Email Writer | Mail Master

[App page](https://appshunter.io/ios/app/ai-email-writer-mail-master/id6738405696)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro Plan | $4.99 | per 7 days |
| Annual Pro Plan | $29.99 | per year |


## Frequently asked questions

### Is Lean PlanDo Flow free?

Lean PlanDo Flow is free to download, with no in-app purchases.

### Is AI Email Writer | Mail Master free?

AI Email Writer | Mail Master is free to download, with in-app purchases available.

### Do Lean PlanDo Flow or AI Email Writer | Mail Master have ads?

Neither Lean PlanDo Flow nor AI Email Writer | Mail Master shows ads.

### Which is updated more often, Lean PlanDo Flow or AI Email Writer | Mail Master?

Lean PlanDo Flow ships an update every 2 months, and AI Email Writer | Mail Master every 3 months. Most recently, Lean PlanDo Flow was updated on September 8, 2026 and AI Email Writer | Mail Master on September 17, 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.*