Comparison

Blink vs Stack Testers Flow Friend

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

Head to head
About

Blink

This app provides frontline workers with a single platform for accessing essential tools, apps, and communications. It aims to boost engagement and retention by centralizing information and streamlining access to workplace applications.

Highlights
  • Centralized Hub for files, assets, and tools
  • Targeted announcement and story feed
  • Integrated messenger with group and 121 chats
  • Micro apps for specific functions (payslips, leave)
  • Single Sign-On for seamless app access
  • Digital replacement for paper and noticeboards
Read full description

The app frontline workers love to open every day. Blink is where key workers start their day, get stuff done, and feel supported and involved. Everything they need – apps, conversations, tools – is one click away. The result? A measurable boost in engagement, retention – and a thriving, digitally-connected workforce. --- "The best investment we've made in 20 years." – Managing Director, Stagecoach "If you want to be ahead of the curve in how you handle internal communications, Blink is absolutely the way to do it." – Director of Organizational Development, Promises Behavioral Health. "Engagement has gone through the roof." – Director of Communications, State Transit. --- Blink isn't an intranet or a traditional comms app – but it will replace both. Inside Blink, you'll find five core tools that will transform your workforce. 1. A Hub for you to keep tabs of every file, asset and tool on one dashboard. 2. A Feed for posting targeted announcements, stories and updates. 3. A Messenger to get quick answers: group, 121, GIFS, and video calls all enabled. 4. Micro Apps – mini-systems that do pretty much anything you want them to (payslips, leave requests, rotas). 5. A Single Sign-On to take you to any app in seconds, within Blink, without a login. --- Instead of using paper and noticeboards... ... you'll have one (digital) place to keep information up-to-date, centralized, and on the record. Instead of internal updates that go unread... ... you'll build a community and strengthen culture through authentic user-generated stories. Instead of unused tools and forgotten logins... ... you'll be able to access any workplace app in seconds using Single Sign-On. Instead of high costs and overheads... ... your workforce will be able to access Microsoft 365 and Sharepoint without a license. Instead of strain on your IT team... ... you'll have a system that requires no input from them – Blink takes care of itself. Instead of an unreachable frontline workforce... ... you'll be able to access anyone, anytime, anywhere, without an @email address or phone number. --- ABOUT BLINK A single idea inspired Blink: an organization's greatest asset is its frontline. Our goal is to empower every frontline worker to maximize their impact, through frictionless technology that gives them a voice, a sense of belonging, and a better everyday. Over 200 frontline organizations trust us to power their workforce, across sectors like healthcare, transport, logistics, retail and hospitality. Blink is headquartered in London with additional offices in New York and Sydney. We hope you'll give Blink a try today.

About

Stack Testers Flow Friend

This mobile toolkit assists environmental engineers with on-site calculations for stack testing. Quickly determine velocity and volume flow by inputting stack size and gas conditions, eliminating the need for manual calculations or laptops. It also aids in calculating differential pressure cell mA output for data logging.

Highlights
  • Velocity and volume flow calculations
  • Input stack size and gas conditions
  • Differential pressure cell mA output calculation
  • Preloaded Engineers Note Book content
  • On-site calculation tool
Features
Read full description

Stack Testers Flow Friend is part of a suite of apps developed by the Engineers of CES Environmental Instruments, one of the UKs leading environmental Test Houses and incorporates some of their on-site calculations in an easy to use app. When working on the stack and you need to quickly calculate a velocity or volume flow, the answer can be at your fingertips. By inputting the essential parameters of the stack size and gas conditions, the velocity and volume flow can be determined without the need to manually calculate the value or start up a laptop. The app is an essential tool for the professional Environmental engineer. The app is a useful aid to the C & I engineer calculating the Differential Pressure cell mA output used for data logging. The contents of the CES Environmental Instruments popular Engineers Note Book is preloaded within the app.

Screenshots

Blink4 screens
Stack Testers Flow Friend4 screens

Verdict

The call

The clearest difference is review sentiment: Blink at 51% against Stack Testers Flow Friend's 0%. Blink also leads on update cadence (every 5 days vs every 8 months). Stack Testers Flow Friend's advantage is iOS requirement (13.0 vs 18.0). On price, ads, in-app purchases and monetization model 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.

UpkeepUpdate frequency

Blink ships an update every 5 days, Stack Testers Flow Friend every 8 months. The most recent releases landed on October 15, 2026 and October 5, 2026 respectively.

Scorecard3 real differences · 7 level
Blink versus Stack Testers Flow Friend: the parameters behind the verdict, then further details
ParameterBlinkStack Testers Flow Friend
PriceFreeFree
Rating4.5 (445 ratings) — better—
Positive reviews51.2% of reviews — better0.0% of reviews
Number of ratings445 — better—
Update frequencyEvery 5 days — betterEvery 8 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.013.0 — better
Further details — not scored
Size709 MB32 MB
Age rating4+4+
DeveloperSuper Smashing LtdLewis Holmes

Customer experience

Blink

All ratings445 ratings
Positive86.3%
Neutral2.7%
Negative11.0%
Written reviews168 reviews
Positive51.2%
Neutral6.5%
Negative42.3%

Stack Testers Flow Friend

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Blink

Reported bugs

5 issues
  • Login issues after device change
  • Duty board information not syncing
  • Images not displaying properly
  • Frequent app crashes
  • Unable to download payslips

Requested features

6 requests
  • Add video upload capability
  • Improve calendar integration
  • Provide more reaction options
  • Allow users to customize feed
  • Implement dark mode
Show 1 more
  • Add call function in direct messages

Stack Testers Flow Friend

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Blink

No in-app purchases

None

Stack Testers Flow Friend

No in-app purchases

Questions

Is Blink free?
Blink is free to download, with no in-app purchases.
Is Stack Testers Flow Friend free?
Stack Testers Flow Friend is free to download, with no in-app purchases.
Do Blink or Stack Testers Flow Friend have ads?
Neither Blink nor Stack Testers Flow Friend shows ads.
Which is updated more often, Blink or Stack Testers Flow Friend?
Blink ships an update every 5 days, and Stack Testers Flow Friend every 8 months. Most recently, Blink was updated on October 15, 2026 and Stack Testers Flow Friend on October 5, 2026.

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