Comparison

Calculator 17 vs Zephyr

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • User-friendly interface
  • Basic and scientific modes
  • Home screen widget
  • LiveActivity Standby for iPhone
  • Calculation history
  • Customizable themes
Features
Read 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.

About

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.

Highlights
  • 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
Features
Read 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

Calculator 174 screens
Zephyr4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Calculator 17 versus Zephyr: the parameters behind the verdict, then further details
ParameterCalculator 17Zephyr
PriceFree — better$1.99
Rating4.6 (990 ratings)5.0 (2 ratings) — better
Positive reviews21.5% of reviews100.0% of reviews — better
Number of ratings990 — better2
Update frequencyEvery 4 days — betterEvery 10 days
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterPaid
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better17.0
Further details — not scored
Size5 MB13 MB
Age rating4+4+
DeveloperAI APPS SRLJoshua Marx Donvito

Customer experience

Calculator 17

All ratings971 ratings
Positive88.6%
Neutral4.3%
Negative7.1%
Written reviews65 reviews
Positive21.5%
Neutral16.9%
Negative61.5%

Zephyr

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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

None

Calculator 17

No in-app purchases

2 purchases

Zephyr

Subscriptions1
  • Zephyr Pro Yearly7 Days trial$14.991 Year
One-time1
  • Zephyr Pro Lifetime$19.99

Questions

Is Calculator 17 free?
Calculator 17 is free to download, with no in-app purchases.
Is Zephyr free?
Zephyr costs $1.99, and also offers in-app purchases.
Which has better reviews, Calculator 17 or Zephyr?
Zephyr is rated higher. Calculator 17 averages 4.6 out of 5 from 990 ratings, while Zephyr averages 5.0 from 2 ratings.
Do Calculator 17 or Zephyr have ads?
Neither Calculator 17 nor Zephyr shows ads.
Which is updated more often, Calculator 17 or Zephyr?
Calculator 17 ships an update every 4 days, and Zephyr every 10 days. Most recently, Calculator 17 was updated on November 7, 2026 and Zephyr on November 5, 2026.

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