Comparison

QSpec vs Sentry Pass

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

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.

Highlights
  • Daily surveys
  • Photo submission for validation
  • Programmable QR code passes
  • Visit monitoring with check-in/out
  • Detailed reports and notifications
  • Pass revocation
Features
Read full description

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

QSpec4 screens
Sentry Pass3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
QSpec versus Sentry Pass: the parameters behind the verdict, then further details
ParameterQSpecSentry Pass
PriceFreeFree
Rating4.0 (6 ratings) — better3.9 (7 ratings)
Positive reviews0.0% of reviews—
Number of ratings67 — better
Update frequencyEvery 15 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.013.0 — better
Further details — not scored
Size36 MB12 MB
Age rating4+4+
DeveloperLinde GmbHPunch Technologies, Inc.

Customer experience

QSpec

All ratings6 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Sentry Pass

All ratings7 ratings
Positive71.4%
Neutral0.0%
Negative28.6%

In-app purchases

None

QSpec

No in-app purchases

None

Sentry Pass

No in-app purchases

Questions

Is QSpec free?
QSpec is free to download, with no in-app purchases.
Is Sentry Pass free?
Sentry Pass is free to download, with no in-app purchases.
Which has better reviews, QSpec or Sentry Pass?
QSpec is rated higher. QSpec averages 4.0 out of 5 from 6 ratings, while Sentry Pass averages 3.9 from 7 ratings.
Do QSpec or Sentry Pass have ads?
Neither QSpec nor Sentry Pass shows ads.
Which is updated more often, QSpec or Sentry Pass?
QSpec ships an update every 15 months, and Sentry Pass every 2 months. Most recently, QSpec was updated on June 1, 2026 and Sentry Pass on September 10, 2026.

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