Obsidian vs Dev Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Obsidian
Organize your thoughts and ideas with a powerful knowledge base that utilizes local Markdown files. This app acts as your personal second brain, accessible on your mobile device for seamless note-taking and idea connection.
- Local Markdown file storage
- Customizable toolbar
- Graph view for connections
- Community plugins
- Themes
- iCloud sync
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Obsidian is a powerful knowledge base that works on top of a local folder of plain text Markdown files. It is a second brain, for you, forever. Now available on the go for iOS! Features include: - Customizable toolbar - Pull down quick actions - Graph view - Community plugins - Themes - Sidebar pinning for tablet - iCloud vaults
Dev Calc
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.
- 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
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You can convert numeric to Bin, Oct, Dec, Hex immediately with Signed, Unsigned. ** Introduction ** This is a calculator app to help System Developers and Programmers. Convert numeric to binary, octal, decimal, hex immediately. You can set conversion bit number and signed/unsigned, so you can adjust settings for binary, short, int, long. Also you can get clolor code for system application from RGB and Color Picker. And you can choose preset color simply. ** Overview ** - Convert numeric to binary, octal, decimal, hex immediately. - You can edit each digits for detailed confirmation. - You can get color code from RGB, HSL, HSV and Color Picker. - Using preset color, you can get color code quickly. ** Characteristics ** >> Numeric conversion - You can input numeric in binary, octal, decimal, hex. - You can choose bits size from 8bits, 16bits, 32bits, 64bits. - You can choose signed numeric or unsigned numeric. - you can edit each digits directly. >> Color code - You can see a color code in Hex, RGB, HSL and HSV. - Support alpha channel of color. - You can get a color code from RGB, HSL, HSV adjuster and Color Picker. - You can get a color code just by choosing a preset color. ** Terms of Use ** https://coconutsdevelop.com/en/terms/terms_of_use.html ** Developer website ** https://coconutsdevelop.com/
Screenshots
Verdict
The clearest difference is rating: Obsidian at 4.5 against Dev Calc's 2.0. Obsidian also leads on in-app purchases (none vs 1) and ads (none vs shown). Dev Calc's advantage is iOS requirement (13.0 vs 15.6). On price, review sentiment and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Dev Calc sells 1 in-app purchase, starting at $1.99 per month. Obsidian asks for nothing beyond the download.
Obsidian holds the better App Store score, 4.5 against 2.0. That said, the two scores are not equally well evidenced: Obsidian has 2.7K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 62% of Obsidian's written reviews are positive against 60% of Dev Calc's.
Obsidian ships an update every 3 weeks, Dev Calc every 2 months. The most recent releases landed on September 24, 2026 and June 4, 2026 respectively.
| Parameter | Obsidian | Dev Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2.7K ratings) — better | 2.0 (2 ratings) |
| Positive reviews | 62.1% of reviews — better | 60.0% of reviews |
| Number of ratings | 2.7K — better | 2 |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | #133 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 38 MB | 51 MB |
| Age rating | 4+ | 4+ |
| Developer | Dynalist Inc. | Toshiya Hondo |
Customer experience
Obsidian
Dev Calc
Bugs and requests
Obsidian
Reported bugs
3 issues- Sync issues leading to data loss
- Freezing and crashing on mobile devices
- Editing bugs and text input issues
Requested features
5 requests- Improved sorting and organization options
- WYSIWYG editing on mobile
- Better integration with other cloud storage services
- More intuitive onboarding process for new users
- Native mobile widgets and share sheet integration
Dev Calc
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Obsidian
No in-app purchases
Dev Calc
- Remove Ads (Monthly)$1.991 Month









