Comparison

RST 599TK Pro vs SpeakFlow AI Shadowing

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

Head to head
About

RST 599TK Pro

Read full description

This app is a real CW QSO simulator for Amateur Radio.  "599BK & AADX Contest type QSO" is supported.  Input of Morse Codes are by using Electric Touch Keyer or Straight Key.  Changing of TX/RX is by SEND button. Supported Min-in CW Decoder too. 【Characteristic】 1. "599BK" and "Contest" style support. 2.Support the CW Speed Control, Reverse of Dot/Dash pad, and Straight Key. 3.Realistic signal meter according to the audio signal level. 4.Status display showing TX / RX operation. 5.Support the space insertion operation both automatic and manual. 6.Support the Min-in CW Decoder function. 7.Support the shortcut-key of CQ and TU. CQ Button function can be set by setting menu. 8.Support the repeat-call function. It works only when the TU button is pressed at the end of the QSO. 9.Support the RIT function. 10. Support input function by key button. 【How to use】 1.The case of CQ Calling Press SEND button Input "CQ CQ DX DE (YOUR CALLSIGN) PSE K" by Touch Keyer or Straight Key. Press SEND button again 2.The case of CQ Answering Press SEND button Input "QRZ DX" by Touch Keyer or Straight Key. Press SEND button again --- Examples of QSO --- [CQ Calling] "CQ CQ DX DE xxnxx xxnxx PSE K" >>> xxnxx DE **n** K "**n** DE xxnxx UR RST 559 BK" >>> R MY RPT 559 UR RST 599 BK "QSL TU" >>> R 73 TU "E E" >>> E E [CQ Ansewing] "QRZ DX" >>> "CQ CQ DE **n** **n** PSE K" "**n** DE xxnxx K" >>> "xxnxx DE **n** UR RST 579 BK" "R **n** DE xxnxx UR RST 599 TU" >>> "R TU" "E E" >>> E E --- DETEC WORDS --- [CQ Calling] CQ CQ DX CQ NA CQ JA [CQ Ansewing] QRZ QRZ DX QRZ NA QRZ JA [BOTH] DE K BK UR RST 73 TU E E etc... 【Example usage video】 - Touch Keyer - https://www.youtube.com/watch?v=4CqcH7-4iiE - Straight Key - https://www.youtube.com/watch?v=CuSEaJtD3KQ - Microphone IN Mode - https://www.youtube.com/watch?v=goN9hVDEGnM

About

SpeakFlow AI Shadowing

Features
Read full description

SpeakFlow - Master Fluent English Speaking with AI "Tired of listening to countless hours of English but still can't speak fluently?" "Feeling unconfident, unsure if your pronunciation is correct?" For every English learner facing these challenges, a new solution is here. SpeakFlow is a next-generation training app specializing in shadowing, powered by state-of-the-art AI voice recognition technology. What is Shadowing? Shadowing is a powerful language training method where you listen to English audio and repeat it like a shadow, just a moment behind the speaker. It's a highly effective way to improve both your listening and speaking skills simultaneously—a technique practiced even by professional interpreters. A New Learning Experience with SpeakFlow Traditional shadowing has one major drawback: you never know if your pronunciation is accurate. SpeakFlow solves this problem with AI technology. Key Features 1. Real-Time Pronunciation Scoring by AI As you shadow, our AI transcribes your voice in real time. It then compares your speech to the native speaker's audio and evaluates your pronunciation with an objective score. Instantly see which words you've mastered and where you need to improve. Say goodbye to guesswork and practice with precision. 2. Master Difficult Phrases with AB Loop Repetition Struggling with a specific phrase? The AB Loop feature is here to help. Repeatedly play and practice only the parts you find difficult, allowing you to focus your efforts and master them effectively. 3. Diverse Learning Content via Import Import and practice with a wide range of audio content tailored to your goals—from practical business phrases and daily conversations to news and materials for TOEIC® & TOEFL® test preparation. Keep your learning journey fresh and engaging. 4. Visualize Your Progress Track your daily training results and score trends with easy-to-read graphs. Seeing your improvement visually will keep you highly motivated. Recommended for: - Those who want to improve their speaking skills, especially fluency and pronunciation. - Students aiming for high scores on standardized tests like TOEIC® or TOEFL®. - Individuals preparing for studying abroad, overseas assignments, or international business trips. - Professionals who want to acquire persuasive English for business situations. - Learners who haven't seen results from listening-only practice. - Anyone feeling they've hit a wall in their self-study journey. Term of Service https://spec2.github.io/docs/terms-of-service.html Privacy Policy https://spec2.github.io/docs/privacy-policy.html

Screenshots

RST 599TK Pro4 screens
SpeakFlow AI Shadowing4 screens

Verdict

The call

The clearest difference is price: SpeakFlow AI Shadowing at Free against RST 599TK Pro's $2.99. SpeakFlow AI Shadowing also leads on update cadence (every 2 weeks vs every 3 months). RST 599TK Pro's advantage is in-app purchases (none vs 2) and iOS requirement (15.0 vs 17.0). On ads 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

SpeakFlow AI Shadowing is free to download; RST 599TK Pro costs $2.99 up front. SpeakFlow AI Shadowing sells 2 in-app purchases, starting at $2.99 per month. RST 599TK Pro asks for nothing beyond the download.

UpkeepUpdate frequency

RST 599TK Pro ships an update every 3 months, SpeakFlow AI Shadowing every 2 weeks. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 2 level
RST 599TK Pro versus SpeakFlow AI Shadowing: the parameters behind the verdict, then further details
ParameterRST 599TK ProSpeakFlow AI Shadowing
Price$2.99Free — better
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.0 — better17.0
Further details — not scored
Size32 MB14 MB
Age rating4+4+
Developerkoji kamogawaShota Iwamatsu

In-app purchases

None

RST 599TK Pro

No in-app purchases

2 purchases

SpeakFlow AI Shadowing

Subscriptions2
  • Premium Plan (Monthly)$2.991 Month
  • Premium Plan (Annual)$29.991 Year

Questions

Is RST 599TK Pro free?
RST 599TK Pro costs $2.99, with no in-app purchases.
Is SpeakFlow AI Shadowing free?
SpeakFlow AI Shadowing is free to download, with in-app purchases available.
Do RST 599TK Pro or SpeakFlow AI Shadowing have ads?
Neither RST 599TK Pro nor SpeakFlow AI Shadowing shows ads.
Which is updated more often, RST 599TK Pro or SpeakFlow AI Shadowing?
RST 599TK Pro ships an update every 3 months, and SpeakFlow AI Shadowing every 2 weeks. Most recently, RST 599TK Pro was updated on November 7, 2026 and SpeakFlow AI Shadowing on October 30, 2026.

Other comparisons