iStroboSoft vs Amazing Slow Downer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iStroboSoft
This application provides highly accurate tuning for musical instruments, offering professional-grade precision with a real-time strobe display. It supports various tuning modes, temperaments, and input methods, making it suitable for both acoustic and electric instruments.
- 1/10th cent accuracy
- Real-time strobe display
- Guided Mode Tuning
- 12 Temperaments with adjustable root
- Assisted Low Note Detection
- Drop/Capo mode
- Adjustable Concert A
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Usage questions? ***Please contact us before posting an issue in the reviews.*** Peterson Support at info@strobosoft.com or call 708.388.3311 M-F 8am-5pm (CST) TRUSTED BY PROFESSIONALS FOR OVER 70 YEARS. ---iStroboSoft for iOS--- Peterson Strobe Tuners' popular StroboSoft tuning application for iPhone and iPad. iStroboSoft™ offers the unmatched accuracy of a mechanical strobe tuner for the highest degree of precision available in a software tuning application. Plug in and tune your electrics and acoustics quickly and easily with 1/10th cent accuracy. Peterson Tuners has offered tuning solutions for over 70 years and is the only company specializing in hardware and software tuning products for all levels of musicians. FEATURES: • Stand-by mode to reduce battery usage or freeze the display. • Guided Mode Tuning offers an alternate strobe display that slows the strobe bands one-by-one as you come closer to tune. • Speed control for strobe display; dampen the response for a longer note display. • 12 Temperaments with adjustable root control. • Display all sharps note display. • Assisted Low Note Detection (ALND) helps capture very low frequencies. • Mains hum filter option reduces the chances of the tuner latching on to 50 or 60Hz cycle hum when using a direct line-in connection or while using the app during device charging. • Smooth, real-time strobe display allows you to achieve an unmatched level of accuracy. • Note/Octave window displays the correct note and octave for the note being tuned. • Cents display allows you to see how far out of tune your note is in cent values. • Tune in auto or manual mode. • Toggle the display to show: cents, Hz, MIDI note value for the note being tuned. • Glowing flat/sharp indicators assist when tuning a note very far from the target position. • Noise filter: Use the noise filter when utilizing an external mic or clip-on tuning device to help reduce the effect of extraneous environmental noise during tuning. • Input boost: The input boost will raise all input frequencies by +24dB. • Calibration mode: iStroboSoft can be calibrated to an external source guaranteeing 1/10th cent accuracy. • Drop/Capo mode: iStroboSoft will auto-transpose notes up or down to one full octave. • Adjustable Concert A: Change the Concert A reference of the tuner to accommodate tuning to a fixed instrument, such as a piano, or tune instruments that do not utilize the typical Western A440 reference. • Full screen mode permits the strobe display to be maximized on screen to allow better viewing from a distance. • Change strobe display colors to accommodate different lighting environments or set a preferred user color for those with limited color palette recognition. Use the built-in mic on your device for tuning or connect directly via the headphone jack using an approved adaptor cable or interface. Devices without a headphone jack can connect a pickup or mic using the lightning-to-audio adaptor. Support via email at: info@strobosoft.com or call 708.388.3311 M-F 8am-5pm (CST)
Amazing Slow Downer
This app allows musicians to adjust the playback speed of music without altering its pitch. It supports looping sections, changing tuning and key, and even speeding up audio. Ideal for learning songs, techniques, or improving transcription skills.
- Adjust playback speed (25%-200%)
- Maintain pitch while changing speed
- Seamless looping
- Change tuning and musical key
- Supports Apple Music streaming
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If you're a musician who likes to learn new songs and techniques by listening to the same piece of music over and over but wish that the music could be played a little slower, then you'll enjoy Amazing Slow Downer. You can repeat any section of the music at full speed, slow it down or even speed it up by changing the speed between 25% (1/4 of original speed) and 200% (double speed) without changing the pitch! Change the tuning or musical key? No problem, Amazing Slow Downer handles that as well. Setup seamless loops by touching the "Set" buttons during playback. Amazing Slow Downer is the ideal tool for any musician, transcriber or dancer wanting to improve their skills. New - Support for streaming "Apple Music" audio! Note: Some functions such as "Pitch change" and "Equalizer" are not available when playing "Apple Music" songs. Please note: According to Spotify, third party apps will not any longer have access to streaming Spotify content in a way that works for slowing down / pitch change audio starting September 1, 2022. This will affect Amazing Slow Downer. This means that you should NOT buy Amazing Slow Downer if playing Spotify content is your only use of the app. This change does NOT affect any other type of audio content that Amazing Slow Downer can play back.
Screenshots
Verdict
The clearest difference is in-app purchases: Amazing Slow Downer at none against iStroboSoft's 11. iStroboSoft's advantage is rating (4.3 vs 3.9) and price ($9.99 vs $14.99). On review sentiment, ratings volume, ads and chart position 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
iStroboSoft costs $9.99 and Amazing Slow Downer $14.99 up front. iStroboSoft sells 11 one-off in-app purchases. Amazing Slow Downer asks for nothing beyond the download.
iStroboSoft holds the better App Store score, 4.3 against 3.9. Both are backed by a comparable volume of ratings — 298 and 447 respectively. Written reviews point the same way: 76% of iStroboSoft's written reviews are positive against 69% of Amazing Slow Downer's.
iStroboSoft ships an update fortnightly, Amazing Slow Downer every 2 months. The most recent releases landed on September 25, 2026 and September 24, 2026 respectively.
| Parameter | iStroboSoft | Amazing Slow Downer |
|---|---|---|
| Price | $9.99 — better | $14.99 |
| Rating | 4.3 (298 ratings) — better | 3.9 (447 ratings) |
| Positive reviews | 76.0% of reviews — better | 69.1% of reviews |
| Number of ratings | 298 | 447 — better |
| Update frequency | Fortnightly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Best chart rank | #23 — better | #29 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 5 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Peterson Tuners | Roni Music |
Customer experience
iStroboSoft
Amazing Slow Downer
User reviews
iStroboSoft
From 298 App Store ratingsWhat we love
- 🚀 Extremely accurate
- 🔒 Reliable and stable
- 👍 Fantastic for instrument setup and intonation
- 👍 Portable and convenient
- 👍 Excellent value for the price
Room to improve
- 🐛 Compatibility issues with iOS updates
- 💰 Expensive in-app purchases for additional features
- 🐛 Inconsistent performance, jumps between notes
- 🐛 Struggles with low and high notes
- 🐛 Microphone input not always reliable
Amazing Slow Downer
From 447 App Store ratingsWhat we love
- 🚀 Excellent for learning songs
- 👍 Great for transcribing and practicing
- 🎶 Allows slowing down and looping songs
- 💡 Useful for language learning
- 👍 Intuitive and easy to use
Room to improve
- 🐛 Occasional bugs and crashes
- 🔌 Compatibility issues with Apple Music
- 💰 Considered expensive by some
- 🔍 Difficulty setting precise loop points
- 🔇 No volume control independent of device
Bugs and requests
iStroboSoft
Reported bugs
3 issues- App freezes or crashes on certain iOS versions
- Incorrect note detection on some instruments
- Display issues with newer iPhone/iPad models
Requested features
5 requests- Add support for more sweetened tunings and temperaments
- Improve display visibility and layout for newer devices
- Integrate with audio apps and allow routing through other apps
- Add Apple Watch app for quick tuning access
- Improve noise filtering and input sensitivity
Amazing Slow Downer
Reported bugs
3 issues- Playback freezing or not working as expected
- Inability to access purchased songs from iTunes library
- Connectivity issues when trying to use with Spotify
Requested features
5 requests- Add ability to record and import voice memos
- Improve library management and organization
- Implement Audiobus support for looping in other apps
- Add more precise speed and pitch adjustment controls
- Provide option to display waveform for better visualization
In-app purchases
iStroboSoft
- Extended Frequency Modes$4.99
- Bluegrass Sweeteners$5.99
- Buzz Feiten Pack$5.99
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- Guitar & Bass Sweeteners$5.99
- Orchestral Sweeteners$5.99
- World Sweetener Pack$9.99
- Tuning Tools$9.99
- Steel Guitar Sweeteners$14.99
- Harmonic Tuning$19.99
- Keyboard Sweeteners$19.99
- Full Discounted Upgrade Pack$59.99
Amazing Slow Downer
No in-app purchases
Questions
Is iStroboSoft free?
Is Amazing Slow Downer free?
Which has better reviews, iStroboSoft or Amazing Slow Downer?
Do iStroboSoft or Amazing Slow Downer have ads?
Which is updated more often, iStroboSoft or Amazing Slow Downer?
Which is more popular, iStroboSoft or Amazing Slow Downer?
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