# Complete OS vs Sonder Calendar

The clearest difference is rating: Complete OS at 5.0 against Sonder Calendar's 4.5. Complete OS also leads on device support (4 vs 2). Sonder Calendar's advantage is in-app purchases (none vs 1). On price, review sentiment, ratings volume and update cadence there is nothing between them.

Both are free to download. Complete OS sells 1 in-app purchase, starting at $9.99 per month. Sonder Calendar asks for nothing beyond the download.

Complete OS holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 4 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Complete OS ships an update weekly, Sonder Calendar every 4 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Complete OS | Sonder Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/complete-os/id6766687959/reviews)** | [4.5 (4 ratings)](https://appshunter.io/ios/app/sonder-calendar/id6803707702/reviews) |
| Number of ratings | 4 | 4 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Freemium | **Free** |
| Size | 33 MB | 38 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Complete OS LLC](https://appshunter.io/developer/1896315324) | [Owen Lombardi](https://appshunter.io/developer/6803707704) |

## What reviewers say

### Complete OS

[App page](https://appshunter.io/ios/app/complete-os/id6766687959)

This app acts as a personal life operating system, consolidating habits, meals, tasks, budget, workouts, and notes into a single, focused daily summary. It uses AI to provide personalized insights and streamline daily planning without overwhelming the user.

**Highlights:** AI-powered Daily Brief, Integrated meal planning and grocery lists, Habit tracking with streak counting, Workout logging and import support, Budget tracking and bill reminders, Calendar-aware task management, AI-enhanced note-taking with search

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Complete OS Monthly | $9.99 | per month |


### Sonder Calendar

[App page](https://appshunter.io/ios/app/sonder-calendar/id6803707702)

This app simplifies calendar management by allowing users to input events via voice or text. It categorizes your schedule into seven distinct colors and offers features like goal setting and friend invitations without social media feeds.

**Highlights:** Voice and text event input, Seven color-coded categories, Goal setting and tracking, Repeating event scheduling, Friend invitations for events, Shared joint calendars

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

**In-app purchases:** none


## Frequently asked questions

### Is Complete OS free?

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

### Is Sonder Calendar free?

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

### Which has better reviews, Complete OS or Sonder Calendar?

Complete OS is rated higher. Complete OS averages 5.0 out of 5 from 4 ratings, while Sonder Calendar averages 4.5 from 4 ratings.

### Do Complete OS or Sonder Calendar have ads?

Neither Complete OS nor Sonder Calendar shows ads.

### Which is updated more often, Complete OS or Sonder Calendar?

Complete OS ships an update weekly, and Sonder Calendar every 4 days. Most recently, Complete OS was updated on October 28, 2026 and Sonder Calendar on October 24, 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.*