# Maelstrom vs Calibrate

The clearest difference is in-app purchases: Maelstrom at none against Calibrate's 1. Maelstrom also leads on iOS requirement (15.1 vs 17.6). Calibrate's advantage is update cadence (fortnightly vs every 8 months). On price, ads and device support there is nothing between them.

Both are free to download. Calibrate sells 1 one-off in-app purchase. Maelstrom asks for nothing beyond the download.

Maelstrom ships an update every 8 months, Calibrate fortnightly. The most recent releases landed on October 9, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Maelstrom | Calibrate |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Fortnightly** |
| Size | 32 MB | 4 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Richard Helm](https://appshunter.io/developer/1763890605) | [Warren Peters](https://appshunter.io/developer/1591974619) |

## What reviewers say

### Maelstrom

[App page](https://appshunter.io/ios/app/maelstrom-routine-builder/id6649161353)

**Features:** macOS Compatibility

**In-app purchases:** none


### Calibrate

[App page](https://appshunter.io/ios/app/calibrate-time-block-planner/id6758213974)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calibrate Pro — Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Maelstrom free?

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

### Is Calibrate free?

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

### Do Maelstrom or Calibrate have ads?

Neither Maelstrom nor Calibrate shows ads.

### Which is updated more often, Maelstrom or Calibrate?

Maelstrom ships an update every 8 months, and Calibrate fortnightly. Most recently, Maelstrom was updated on October 9, 2026 and Calibrate on October 14, 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.*