Comparison

Stop! Random letter generator vs Prime Speed Controller

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

Head to head
About

Stop! Random letter generator

This app randomly selects letters for popular word games like Stop and Categories. It offers features like audible letter pronunciation, tracking used letters, and setting round timers to enhance gameplay. Shake your device to draw the next letter, making your games more dynamic.

Highlights
  • Random letter selection
  • Audible letter pronunciation
  • Track used letters
  • Set round time limits
  • Shake to draw letter
Features
Read full description

Do you play Stop, Guggenheim, Categories, Fight List or City, Country, River? This app is the perfect partner for your game: it randomly picks the next letter in a fun and simple way! More than just picking letters, the app also lets you: - Hear the chosen letter out loud; - Track which letters have already been used; - Set a time limit for each round; - Shake your phone to draw the next letter. Make your games even more dynamic and exciting

About

Prime Speed Controller

Features
Read full description

Prime Speed Controller is a Safari extension that adds A-B loop repeat, playback speed control, seek, and time-saved tracking exclusively to Prime Video on iPhone and iPad. Perfect for language learners and anyone who wants to get more out of Prime Video. ■ A-B Loop Repeat Tap A to mark a start point, tap B to mark an end point — the video loops that segment continuously. Replay any dialogue, scene, or lecture as many times as you need. ■ Playback Speed 15 presets from 0.5x to 5x, with 0.05x fine-tuning. Subtle steps like 1.1x and 1.2x let you boost speed while keeping audio clear. ■ Forward & Rewind Choose 5, 10, 15, or 30-second intervals. Jump back instantly to catch missed dialogue. ■ Time-Saved Tracker The panel shows how much real time you have saved by watching above 1.0x speed, accumulated across sessions. Key Features • A-B Loop: mark any segment for continuous repeat • 15 playback speed presets from 0.5x to 5x • Fine-tune in 0.05x steps • Forward and rewind at 5, 10, 15, or 30 seconds • Time-saved tracker displayed in the panel • Settings saved automatically across sessions • Works on iPhone and iPad • Activates only on Prime Video — no other sites • No data sent to external servers How to Use 1. Follow the in-app guide to enable the extension in Safari Settings. 2. Open Prime Video in Safari and start a video. 3. Use the floating panel to set speed, seek interval, or A-B loop points. Playback speed or seeking may be restricted by Prime Video for certain titles. This app does not detect or skip advertisements. This is an independent, unofficial Safari extension. It is not provided, endorsed, or approved by Amazon, Prime Video, or their affiliates. Amazon and Prime Video are trademarks or registered trademarks of their respective owners.

Screenshots

Stop! Random letter generator4 screens
Prime Speed Controller4 screens

Verdict

The call

The clearest difference is in-app purchases: Prime Speed Controller at none against Stop! Random letter generator's 1. Prime Speed Controller also leads on ads (none vs shown). On price, 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

Both are free to download. Stop! Random letter generator sells 1 one-off in-app purchase. Prime Speed Controller asks for nothing beyond the download.

Scorecard2 real differences · 8 level
Stop! Random letter generator versus Prime Speed Controller: the parameters behind the verdict, then further details
ParameterStop! Random letter generatorPrime Speed Controller
PriceFreeFree
Rating4.5 (46 ratings) — better—
Positive reviews63.6% of reviews—
Number of ratings46 — better—
Update frequencyEvery 4 months—
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size144 MB1 MB
Age rating4+4+
DeveloperIvan DenardiKohei Ishikawa

In-app purchases

1 purchases

Stop! Random letter generator

One-time1
  • Remove ads$2.99
None

Prime Speed Controller

No in-app purchases

Questions

Is Stop! Random letter generator free?
Stop! Random letter generator is free to download, with in-app purchases available.
Is Prime Speed Controller free?
Prime Speed Controller is free to download, with no in-app purchases.
Do Stop! Random letter generator or Prime Speed Controller have ads?
Stop! Random letter generator shows ads; Prime Speed Controller does not.

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