Comparison

Voice Aloud Reader 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

Voice Aloud Reader

This application transforms written text into spoken words, making it ideal for those who are busy or have difficulty reading. It supports a wide range of document types and languages, offering a customizable listening experience.

Highlights
  • Reads text aloud
  • Supports various document formats
  • Over 40 languages supported
  • Customizable reading speed, pitch, and volume
  • Customizable interface and read modes
  • File sharing via iCloud/iTunes
Features
Read full description

Listen to anything, anywhere. The app reads aloud text documents, e-books, websites, and printed books—perfect for commuting, multitasking, relaxing, or making written content easier to access. Designed for all users, including blind and low-vision users, with support for VoiceOver, Larger Text, sufficient contrast, and Reduced Motion. Use iCloud or iTunes to share files between your computer and the app. VOICES SUPPORT Choose from 40 languages, listen in different voices BOOKS SUPPORT Supports the most popular text formats CUSTOM INTERFACE Customize the font and the read mode at your own discretion CUSTOM SETTINGS Change pitch, volume, and speed of reading Supports text-to-speech in the following languages: English, Chinese, French, Polish, Korean, Japanese, Catalan, Afrikaans, Danish, German, Russian, Finnish, Haitian Creole, Dutch, Czech, Latvian, Romanian, Macedonian, Norwegian, Portuguese, Swedish, Slovak, Swahili, Turkish, Welsh, Spanish, Greek, Hungarian, Italian, Hindi, Indonesian, and Vietnamese. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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

Voice Aloud Reader4 screens
Stack Testers Flow Friend4 screens

Verdict

The call

The clearest difference is review sentiment: Voice Aloud Reader at 59% against Stack Testers Flow Friend's 0%. Voice Aloud Reader also leads on update cadence (every 2 months vs every 8 months). Stack Testers Flow Friend's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price and device support 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. Voice Aloud Reader sells 4 in-app purchases, starting at $9.99 per month. Stack Testers Flow Friend asks for nothing beyond the download.

UpkeepUpdate frequency

Voice Aloud Reader ships an update every 2 months, Stack Testers Flow Friend every 8 months. The most recent releases landed on October 13, 2026 and October 5, 2026 respectively.

Scorecard6 real differences · 4 level
Voice Aloud Reader versus Stack Testers Flow Friend: the parameters behind the verdict, then further details
ParameterVoice Aloud ReaderStack Testers Flow Friend
PriceFreeFree
Rating4.6 (19K ratings) — better—
Positive reviews58.7% of reviews — better0.0% of reviews
Number of ratings19K — better—
Update frequencyEvery 2 months — betterEvery 8 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.013.0 — better
Further details — not scored
Size74 MB32 MB
Age rating17+4+
DeveloperMarcin OlawskiLewis Holmes

Customer experience

Voice Aloud Reader

All ratings18,809 ratings
Positive90.9%
Neutral3.5%
Negative5.6%
Written reviews1,028 reviews
Positive58.7%
Neutral7.8%
Negative33.6%

Stack Testers Flow Friend

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

Bugs and requests

Voice Aloud Reader

Reported bugs

3 issues
  • Randomly jumps to different sections of text
  • Struggles with formatting of multi-column documents
  • Occasional crashes when switching between apps

Requested features

5 requests
  • Add bookmarking/resume functionality
  • Improve voice quality and pronunciation
  • Allow custom voice speed increments
  • Implement a way to delete documents from library
  • Add support for iBooks library integration

Stack Testers Flow Friend

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

Voice Aloud Reader

Subscriptions1
  • Pro + Premium Voices 1m3 Days trial$9.991 Month
One-time3
  • Premium OCR 100$0.99
  • Premium OCR 800$1.99
  • Pro version$8.99
None

Stack Testers Flow Friend

No in-app purchases

Questions

Is Voice Aloud Reader free?
Voice Aloud Reader is free to download, with in-app purchases available.
Is Stack Testers Flow Friend free?
Stack Testers Flow Friend is free to download, with no in-app purchases.
Do Voice Aloud Reader or Stack Testers Flow Friend have ads?
Voice Aloud Reader shows ads; Stack Testers Flow Friend does not.
Which is updated more often, Voice Aloud Reader or Stack Testers Flow Friend?
Voice Aloud Reader ships an update every 2 months, and Stack Testers Flow Friend every 8 months. Most recently, Voice Aloud Reader was updated on October 13, 2026 and Stack Testers Flow Friend on October 5, 2026.

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