# Dev Calc vs Notion Calendar

The clearest difference is rating: Notion Calendar at 4.7 against Dev Calc's 2.0. Notion Calendar also leads on in-app purchases (none vs 1) and ads (none vs shown). Dev Calc's advantage is review sentiment (60% vs 39%) and iOS requirement (13.0 vs 18.0). On price and device support there is nothing between them.

Both are free to download. Dev Calc sells 1 in-app purchase, starting at $1.99 per month. Notion Calendar asks for nothing beyond the download.

Notion Calendar holds the better App Store score, 4.7 against 2.0. That said, the two scores are not equally well evidenced: Notion Calendar has 7.8K ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 60% of Dev Calc's written reviews are positive against 39% of Notion Calendar's, so the app with the better star average is not the one people write more warmly about.

Dev Calc ships an update every 2 months, Notion Calendar fortnightly. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Dev Calc | Notion Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (2 ratings)](https://appshunter.io/ios/app/dev-calc-developer-calculator/id1576503219/reviews) | **[4.7 (7.8K ratings)](https://appshunter.io/ios/app/notion-calendar/id1607562761/reviews)** |
| Number of ratings | 2 | **7.8K** |
| Positive reviews | **60.0% of reviews** | 39.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 51 MB | 68 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Toshiya Hondo](https://appshunter.io/developer/1571875732) | [Notion Labs, Incorporated](https://appshunter.io/developer/1232780280) |

## What reviewers say

### Dev Calc

[App page](https://appshunter.io/ios/app/dev-calc-developer-calculator/id1576503219)

This app assists developers and programmers with immediate numeric conversions between binary, octal, decimal, and hexadecimal formats. It also provides tools for generating color codes from RGB, HSL, and HSV values, with a color picker and preset options.

**Highlights:** Numeric conversion (Bin, Oct, Dec, Hex), Signed/Unsigned options, Adjustable bit sizes (8, 16, 32, 64), RGB, HSL, HSV color code generation, Color picker, Preset color options

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads (Monthly) | $1.99 | per month |


### Notion Calendar

[App page](https://appshunter.io/ios/app/notion-calendar/id1607562761)

Effortlessly manage your schedule and meetings with a unified calendar view. Seamlessly integrate with Google Calendar and Notion to keep all your work and life events in one place. Offers multiple time zone support and customizable widgets for quick access to your schedule.

**Highlights:** Deep Google Calendar integration, Connects with Notion documents and projects, Multiple time zone support, Unified view across multiple calendars, Home Screen and Lock Screen widgets, Available in 12 languages

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases:** none

**What reviewers like**

- 🚀 Smooth and fast
- 🔒 Robust security features
- 👍 Clean and intuitive UI
- 👍 Great integration with Notion
- 👍 Helpful widgets

**What reviewers complain about**

- 🐛 Frequent crashes and bugs
- 🔍 Limited calendar views (only 3-day)
- 🔍 No iPad support
- 🔍 Only supports Google Calendar integration
- 🔍 Unreliable syncing and updating

**Reported bugs**

- App crashes when trying to add events
- Syncing issues causing events to disappear or display incorrectly
- Time zone issues leading to incorrect event times
- Widgets not updating properly

**Requested features**

- Add monthly and weekly calendar views
- Integrate with more calendar providers (Microsoft, Apple, etc.)
- Improve iPad compatibility and optimize for larger screens
- Add task management and to-do list functionality
- Enhance customization options (colors, themes, etc.)


## Frequently asked questions

### Is Dev Calc free?

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

### Is Notion Calendar free?

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

### Which has better reviews, Dev Calc or Notion Calendar?

Notion Calendar is rated higher. Dev Calc averages 2.0 out of 5 from 2 ratings, while Notion Calendar averages 4.7 from 7.8K ratings.

### Do Dev Calc or Notion Calendar have ads?

Dev Calc shows ads; Notion Calendar does not.

### Which is updated more often, Dev Calc or Notion Calendar?

Dev Calc ships an update every 2 months, and Notion Calendar fortnightly. Most recently, Dev Calc was updated on November 3, 2026 and Notion Calendar on November 5, 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.*