Calculator° HD vs HelixNotes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator° HD
This utility app offers a user-friendly and aesthetically pleasing calculator experience specifically designed for iPads. It supports handwriting input and includes a range of scientific functions for complex calculations.
- Handwriting support
- Scientific functions
- iPad optimized design
- User-friendly interface
- Aesthetic design
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Calculator HD is designed for iPad , usablility and beauty in mind... FEATURES: -Supprots handwriting -Support many scientific functions Enjoy the Free Caculator.
HelixNotes
A private, open-source Markdown note-taking app that keeps your data on your device. Organize notes with notebooks, tags, and wiki links, and utilize advanced features like mathematical notation and diagrams.
- Local Markdown storage
- Visual and source code editor
- Notebooks, tags, and wiki links
- Task management and calendar views
- KaTeX and Mermaid diagram support
- Version history and backups
- Optional WebDAV sync
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HelixNotes is a private, open-source Markdown notes app. Your notes remain standard Markdown files under your control. No account is required, and HelixNotes has no company-operated cloud. Write with a clean visual editor or switch to source mode when you want direct access to the Markdown. Organize your work with notebooks, tags, wiki links and full-text search. Features include: • Tasks collected from checklists across your notes • List and calendar views with priorities and due dates • Wiki links and an interactive graph view • Daily notes with a built-in calendar • Markdown tables, code blocks and syntax highlighting • KaTeX mathematical notation and Mermaid diagrams • Outline navigation and tag autocomplete • Version history and automatic backups • Light, dark and customizable themes • Optional WebDAV sync with your own server • Optional AI tools using your own provider Nothing leaves your device unless you enable a feature that connects to an external service. Your notes stay readable outside HelixNotes, without a proprietary format or platform lock-in. HelixNotes is free software released under the GNU AGPLv3. Its source code is publicly available on GitLab.
Screenshots
Verdict
The clearest difference is update cadence: HelixNotes at every 3 weeks against Calculator° HD's every 74 months. HelixNotes also leads on device support (3 vs 1). Calculator° HD's advantage is iOS requirement (9.0 vs 14.0). On price, rating, ratings volume and ads 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. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Calculator° HD against 5.0 for HelixNotes. Both are backed by a comparable volume of ratings — 2 and 2 respectively.
Calculator° HD ships an update every 74 months, HelixNotes every 3 weeks. The most recent releases landed on September 10, 2026 and September 4, 2026 respectively.
| Parameter | Calculator° HD | HelixNotes |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 | 2 |
| Update frequency | Every 74 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 20 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | 宗明 杨 | Yuri Karamian |
Customer experience
Calculator° HD
HelixNotes
In-app purchases
Calculator° HD
No in-app purchases
HelixNotes
No in-app purchases
