# Solid Calendar vs ONE

The clearest difference is in-app purchases: ONE at none against Solid Calendar's 2. Solid Calendar's advantage is device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Solid Calendar sells 2 one-off in-app purchases. ONE asks for nothing beyond the download.

Solid Calendar ships an update fortnightly, ONE every 2 weeks. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Solid Calendar | ONE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (120 ratings)](https://appshunter.io/ios/app/solid-calendar/id6448245807/reviews)** | — |
| Number of ratings | **120** | — |
| Positive reviews | 78.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | Paid | — |
| Size | 19 MB | 2 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Solid Apps S.R.L.](https://appshunter.io/developer/1653740418) | [骋飞 武](https://appshunter.io/developer/6775319022) |

## What reviewers say

### Solid Calendar

[App page](https://appshunter.io/ios/app/solid-calendar/id6448245807)

This app helps you manage your time, tasks, and events with a natural language interface. It acts as a digital planner, rotating schedule manager, and reminder system, syncing with your existing device calendars for seamless organization.

**Highlights:** Add events with natural language input, Calendar planner with intuitive interface, Digital planner for tasks and to-do lists, Rotating schedule management, Quick join for video calls, Reminders and smart notifications, Multiple layout options

**Features:** Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock this app (lifetime) | $4.99 | one-time |
| Unlock ALL 10 Solid Apps (lifetime) | $9.99 | one-time |

**What reviewers like**

- ✨ Brilliant app overall
- 👍 Easy to use interface
- 🎨 Visually appealing design
- 💰 Affordable one-time purchase
- 🚀 Fast loading and performance

**What reviewers complain about**

- 🤔 Account required for sync
- 📅 Weekly view horizontal events
- 🐛 Sync issues with date
- ❓ Widgets feel like afterthought
- 🐛 App crashes after update

**Reported bugs**

- Date is a day behind in Australia
- Jumps back to today's date when viewing future dates
- App crashes every time after last update
- Changing daily event time affects rest of week incorrectly
- Weekly view shows all-day events horizontally like timed events

**Requested features**

- Display checkmarks for finished appointments
- Better task management landing pad, floating to-dos
- Option to display little checkmarks for finished appointments
- Floating to-do's on widget page
- Option to display little checkmarks for finished appointments


### ONE

[App page](https://appshunter.io/ios/app/one-focus-deep-life-timer/id6777599934)

**In-app purchases:** none


## Frequently asked questions

### Is Solid Calendar free?

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

### Is ONE free?

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

### Do Solid Calendar or ONE have ads?

Neither Solid Calendar nor ONE shows ads.

### Which is updated more often, Solid Calendar or ONE?

Solid Calendar ships an update fortnightly, and ONE every 2 weeks. Most recently, Solid Calendar was updated on October 27, 2026 and ONE on October 28, 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.*