Calculator 17 vs Zephyr
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator 17
This app offers a user-friendly calculator with basic and scientific modes. Access calculations instantly via a home screen widget and review past computations in a saved history.
- User-friendly interface
- Basic and scientific modes
- Home screen widget
- LiveActivity Standby for iPhone
- Calculation history
- Customizable themes
Read full descriptionHide full description
Introducing Calculator 17, the ultimate tool for all your math needs on the go! *** - User-Friendly: Calculator 17 makes math feel easy and quick, perfect for both school tasks and daily math jobs. *** - Various Modes: Whether it's basic addition or advanced calculations, we have you covered. Switch between the simple calculator and Scientific mode easily. *** - Instant Access: No more searching for the app. With our homescreen widget and LiveActivity Standby for iPhone, perform calculations directly on your main screen, all while choosing from a variety of fun themes. *** - Never Forget: Your calculations are always saved in our handy history tab. Want to share or copy them? It's just one tap away. Calculator 17 isn’t just another math app. It’s your trusty helper, ready to handle any math challenge. Whether you're a student in need of a school calculator or someone who loves playing with numbers, our calculator is the perfect fit.
Zephyr
Manage your TrueNAS Scale NAS with a native iOS app. Offers a polished mobile experience for checking pool health, restarting apps, and investigating alerts. Includes an AI assistant for plain-language queries and actions.
- Native iOS interface for TrueNAS Scale
- AI assistant for plain-language queries
- Actionable assistant for tasks like scrubs and snapshots
- App and container management
- Storage and data management
- Share and networking configuration
- Built-in monitoring and reporting
- Security audit and antivirus scanning
Read full descriptionHide full description
Zephyr is a native iOS app for managing your TrueNAS Scale NAS. Stop pinching at the web UI on your phone — Zephyr gives you a fast, polished mobile experience designed from the ground up for iPhone and iPad. Whether you're checking pool health from the couch, restarting an app on a train, or investigating a disk warning at 2 AM, Zephyr puts everything one tap away. Zephyr Assistant Ask about your NAS in plain language. The assistant looks up your pools, disks, apps and alerts to answer, and explains alerts, pool issues and security audit findings right where you see them. • Chat with Claude or ChatGPT using your own API key, use any OpenAI-compatible server, or run a model on your NAS with Ollama • Conversations are saved on your NAS, and you can see exactly what the assistant looked up • Zephyr asks before any NAS details are sent to a hosted model • Runs in the Zephyr Helper, a small app Zephyr installs on your NAS (TrueNAS 25.04 or later) Zephyr Pro (optional) • The assistant takes actions: start a scrub, take a snapshot, run a backup, update or roll back an app. Every change is a card you approve • Book things for later, keep apps updated automatically with rollback, and get scheduled check-ins • See when each pool will fill, and get a weekly digest of your NAS • Your NAS on the Lock Screen, in StandBy and in Control Center Apps & containers • Start, stop, restart, and update apps with a tap • Install from the TrueNAS catalog or your own Docker Compose YAML • Live container logs streamed over WebSocket • "Update All" with a single confirmation Storage & data • Pool dashboard with health, usage, and ZFS topology • Step-by-step help replacing a failed disk, and live scrub and resilver progress • Manage datasets, quotas, and snapshots • Schedule snapshot tasks, scrubs, and replication • Cloud sync to S3, Backblaze, and the rest Shares & networking • Create SMB and NFS shares with full configuration support • Manage users, groups, and SMB access • Configure interfaces, services, and cron jobs Built-in monitoring • Customisable dashboard with live system load, CPU temps, network throughput, disk temps, ARC hit ratio, and GPU stats • Reporting graphs for any metric your NAS exposes • Home screen widgets that keep themselves up to date • Live Activities for scrubs and resilvers • Push notifications when something needs attention Security & integrity • Built-in Security Audit scoring Security, Data Protection, Performance, and Reliability — and the assistant can explain how to fix what it finds • ClamAV antivirus scanning with scheduled scans and history • Critical alert tracking and acknowledgement System administration • Reboot or power off your NAS safely • Manage boot environments (activate, delete) • Check for and apply system updates • View certificates and expiry status Privacy first Zephyr connects directly to your NAS, and your credentials stay in your iPhone's Keychain. No analytics, no ads, no account. Self-signed certificates are supported out of the box. Compatibility Works with TrueNAS Scale 24.10 through 26, automatically using the modern WebSocket transport on newer servers and falling back to REST on older ones. The assistant needs TrueNAS 25.04 or later. Try before you connect Demo mode lets you explore every screen, Pro features included, with a fully populated NAS. No setup required. Zephyr Pro is a yearly subscription with a 7-day free trial, or a one-time lifetime purchase. Payment is charged to your Apple Account when you confirm the purchase. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period, and you can manage or cancel it in your Apple Account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://privacy.zephyrtech.com.au
Screenshots
Verdict
The clearest difference is review sentiment: Zephyr at 100% against Calculator 17's 22%. Zephyr also leads on rating (5.0 vs 4.6). Calculator 17's advantage is price (Free vs $1.99) and in-app purchases (none vs 2). On ads, device support and iOS requirement 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
Calculator 17 is free to download; Zephyr costs $1.99 up front. Zephyr sells 2 in-app purchases, starting at $14.99 per year. Calculator 17 asks for nothing beyond the download.
Zephyr holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Calculator 17 has 990 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 22% of Calculator 17's written reviews are positive against 100% of Zephyr's.
Calculator 17 ships an update every 4 days, Zephyr every 10 days. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.
| Parameter | Calculator 17 | Zephyr |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.6 (990 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 21.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 990 — better | 2 |
| Update frequency | Every 4 days — better | Every 10 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 5 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | AI APPS SRL | Joshua Marx Donvito |
Customer experience
Calculator 17
Zephyr
Bugs and requests
Calculator 17
Reported bugs
3 issues- Widget shows up blank
- Numerical display is cut off
- Significant delay between key presses and display update
Requested features
3 requests- Add landscape mode support
- Improve widget responsiveness
- Increase bracket functionality
Zephyr
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Calculator 17
No in-app purchases
Zephyr
- Zephyr Pro Yearly7 Days trial$14.991 Year
- Zephyr Pro Lifetime$19.99









