QSpec vs Sentry Pass
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
QSpec
This app helps manage gas cylinder inventory, track blend components, and monitor expiration dates for optimal process performance. It simplifies cylinder tracking and provides on-demand electronic Certificates of Analysis.
- Scan and store cylinder information
- Track blend expiration dates
- Set expiration alerts
- Retrieve and email ECOAs
- Create and email reorder lists
- Assign cylinders to locations
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Unleash the power of productivity with Linde’s QSpec. Quickly verify gas blend components and mix accuracy, and track the expiration date of your gas blends to maintain optimal process performance. Simplify cylinder management and cylinder tracking by using your phone as a mobile database of your cylinder information with QSpec. Quickly access on-demand Electronic Certifications of Analysis (ECOA) for each cylinder you scanned into your phone. QSpec Features: • Scan and store cylinder information, blend expiration dates and blend specifications in your phone. • Set alerts to monitor and prevent gas blend expiration dates to ensure process quality. • Quickly retrieve and email ECOA’s • Create, store and email your cylinder reorder list. • Assign scanned cylinders to customizable locations to assist with cylinder tracking
Sentry Pass
This app simplifies community entry management by allowing users to submit daily surveys and photos for visual validation. It issues scannable QR code passes that expire nightly and tracks visits with check-in/check-out functionality. Detailed reports provide insights into entries and allow for pass revocation.
- Daily surveys
- Photo submission for validation
- Programmable QR code passes
- Visit monitoring with check-in/out
- Detailed reports and notifications
- Pass revocation
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SENTRY (Safe Entry) is the easiest way to empower your community to fill out a survey. - It offers the following: - Daily Surveys Simple, daily surveys - Submit Photo Say cheese! Respondents submit a “selfie” photo for visual validation purposes. - SENTRY Pass Distribute daily passes Issue SENTRY passes that expire each night, with scannable, programmable QR codes. In the PunchAlert app or any web browser. Customize the colors, expiration times, and more. -Monitor Visits Check in with your Pass. Keep track of who is on property by enabling any scan of the SENTRY pass to check you in and out. No extra hardware required. Use any device’s camera app to do the scanning! - Reports and Notifications Review daily reports View detailed summary reports filtered by day, time, role, list, pass status, and check-in status. Drill down to evaluate successful or failed entries, and even revoke passes as necessary.
Screenshots
Verdict
The clearest difference is update cadence: Sentry Pass at every 2 months against QSpec's every 15 months. Sentry Pass also leads on iOS requirement (13.0 vs 18.0). 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 — 4.0 for QSpec against 3.9 for Sentry Pass. Both are backed by a comparable volume of ratings — 6 and 7 respectively.
QSpec ships an update every 15 months, Sentry Pass every 2 months. The most recent releases landed on June 1, 2026 and September 10, 2026 respectively.
| Parameter | QSpec | Sentry Pass |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (6 ratings) — better | 3.9 (7 ratings) |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 6 | 7 — better |
| Update frequency | Every 15 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 36 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Linde GmbH | Punch Technologies, Inc. |
Customer experience
QSpec
Sentry Pass
In-app purchases
QSpec
No in-app purchases
Sentry Pass
No in-app purchases









