# One Calendar vs RigCheck Fleet

The clearest difference is ratings volume: One Calendar at 21K against RigCheck Fleet's 2. One Calendar also leads on device support (4 vs 1) and iOS requirement (15.0 vs 17.0). RigCheck Fleet's advantage is review sentiment (100% vs 81%) and rating (5.0 vs 4.8). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. One Calendar sells 1 one-off in-app purchase and RigCheck Fleet sells 1 in-app purchase, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

RigCheck Fleet holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: One Calendar has 21K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 81% of One Calendar's written reviews are positive against 100% of RigCheck Fleet's.

One Calendar ships an update every 3 weeks, RigCheck Fleet every 9 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | One Calendar | RigCheck Fleet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (21K ratings)](https://appshunter.io/ios/app/one-calendar/id1238379385/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/rigcheck-fleet/id6761272314/reviews)** |
| Number of ratings | **21K** | 2 |
| Positive reviews | 80.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 91 MB | 10 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Code Spark](https://appshunter.io/developer/1238379384) | [JOHN HOWARD RESLER HOYER](https://appshunter.io/developer/1882182731) |

## What reviewers say

### One Calendar

[App page](https://appshunter.io/ios/app/one-calendar/id1238379385)

Consolidate all your calendars from various providers into a single, easy-to-read view. Manage appointments, events, and birthdays efficiently across all your devices. Offers a clean interface for seamless organization.

**Highlights:** Integrates multiple calendar providers, Unified calendar view, Manage appointments and events, Syncs across devices, Customizable colors and themes, Easy to use interface

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OneCalendar premium | $5.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 👍 Clean and simple interface
- 👍 Integrates multiple calendars
- 🚀 Syncs across devices
- 👍 Customizable colors and themes

**What reviewers complain about**

- 🐛 Syncing issues
- 🐛 Bugs and glitches
- 🔒 Lacks security features
- 🔋 Drains battery
- 👎 Restrictive features in free version

**Reported bugs**

- Sync errors
- Unresponsive buttons
- Incorrect time zone display
- Duplicate events
- Inability to delete future occurrences of recurring events

**Requested features**

- Multiple reminders for events
- Ability to edit recurring events
- Option to change event calendar after creation
- Printing support
- More customization options


### RigCheck Fleet

[App page](https://appshunter.io/ios/app/rigcheck-fleet/id6761272314)

Streamline heavy equipment inspections with this app, creating detailed, photo-backed records to prevent failures and reduce downtime. It helps manage your fleet, track machines, and empower operators to quickly report issues.

**Highlights:** Fleet inspection management, Photo documentation of issues, Machine tracking, Operator issue flagging, Customizable inspection types, Crew management

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Owner Pro | $9.99 | per month |


## Frequently asked questions

### Is One Calendar free?

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

### Is RigCheck Fleet free?

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

### Which has better reviews, One Calendar or RigCheck Fleet?

RigCheck Fleet is rated higher. One Calendar averages 4.8 out of 5 from 21K ratings, while RigCheck Fleet averages 5.0 from 2 ratings.

### Do One Calendar or RigCheck Fleet have ads?

Neither One Calendar nor RigCheck Fleet shows ads.

### Which is updated more often, One Calendar or RigCheck Fleet?

One Calendar ships an update every 3 weeks, and RigCheck Fleet every 9 days. Most recently, One Calendar was updated on November 3, 2026 and RigCheck Fleet on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*