RacquetTune vs Spinfire Pro 2
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RacquetTune
This app uses sound to accurately measure racquet string tension and analyze racquet performance. It offers tools to customize racquets, simulate different configurations, and track stringing consistency for various racket sports.
- String tension measurement
- Swingweight calculator
- Stiffness calculator
- Racquet configuration simulation
- Tension history tracking
- Export test data
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Listen to your racquet and perfect your game! RacquetTune ensures that your racquet is ideally suited to your style of play. Simple and straightforward to use, the app uses the sound generated by tapping the strings to calculate the tension with high accuracy. In addition, the interactive swingweight calculator aids in customizing your racquet to fit your own stroke pattern, while the stiffness calculator allows you to simulate different racquet configurations. RacquetTune not only makes it easier to decide when it is time to restring, it is also an invaluable tool when testing different racquets and strings and in identifying which of your racquets is best suited for different types of games. RacquetTune also allows you to check whether your stringer is consistent in his work. RacquetTune includes the following user-friendly tools: Tension measurement - Quickly determines the tension and stringbed stiffness. - Able to detect changes in tension as small as 0.1 kg/0.2 lb. - An accuracy indicator ensures results are consistent. - Graphical presentation of sound waves helps you find the ideal way of tapping the strings. - Settings can be customized to serve tennis, squash, racquetball and badminton racquets, respectively. - View the tension history for each racquet as a list or a graph. - Email a spreadsheet with test data. Swingweight calculator - Add as many weights as you wish to the frame. - Move and change weights to visualize how swingweight, balance and sweet spot location are affected. - Enter target values for the racquet and let RacquetTune distribute the weights automatically. Stiffness calculator - Simulate various racquet and string configurations - Vary tension, string type and racquet head size. - Shows load-displacement curves, stiffness and elastic energies - Handles the large deformations encountered in actual play View a demo video at racquettune.com RacquetTune has been featured in tennis magazines in USA, Italy, France, Germany, Sweden and Norway. "The app is very, very impressive. I get more tension diagnostic questions than just about anybody in the universe, so this is a very good thing to be able to recommend." Jonathan Wolfe US Racquet Stringers Association Note, that the actual string tension in the racquet and the setting seen on a stringing machine are two different things and therefore incomparable - more information can be found at racquettune.com.
Spinfire Pro 2
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Introducing the Ultimate Tennis Training Machine App Take your tennis training to the next level with our state-of-the-art tennis training machine app, designed to cater to players of all skill levels. Engineered for precision, performance, and ease of use, this app will transform the way you train, offering unparalleled practice sessions. One App, Multiple Sports: Spinfire Pro 2 Tennis & Padel Machines: Our machine and app has support for Tennis, Padel & Lacrosse. Spinfire Pro 2 Pickleball Machine: Our same app allows for customised shot placement and drills Pickleball. Key Features: - AI Drill Creator: Choose your skill level, tell it the types of shots you want to practice and how many ball and it will automatically create your customised Drill. We include numerous examples to get you going. - Precision Aiming: When paired with Spinfire Touch balls, achieve consistent accuracy with our high-tech ball delivery mechanism, ensuring the perfect shot placement every time. - Fine Tuning: Our bulk modifier allows you to modify all or some existing shots for all variables: Speed, Spin, Elevation, Width, Flip delivery side, Interval and more depending on Wind conditions or Ball types of the day. - Adjustable Angles: Customise the trajectory and angles, simulating real match conditions for full single court widths to elevations from 0 to 60 degrees for perfect Lobs or Volleys Multiple Modes for All Skill Levels Beginner Mode: Get started quickly with our court map selection and easy-to-use settings perfect for novice players. Intermediate Mode: Great for those who have played for a while and trying to level up specific techniques or shots. Advanced Mode: Unlock more sophisticated features designed for higher-level players and coaches for perfect ball placement. Versatile Training Programs Customisable Drills: Create and save custom drills tailored to your specific needs, from basic practice routines to advanced training programs with up to 30 shots per drill. Bulk Modifications: Adjust speed, spin, elevation, interval, and width for all or selected shots, and flip sides from forehand to backhand effortlessly. Quick Drills: Choose from vertical delivery locations, horizontal random delivery at three widths, and 2-line drills at three different widths. Individual Shot Control Test Shots: Individually test each shot to ensure perfect delivery. Shot Management: Easily remove or duplicate shots within a drill. Single Fire Mode: Ideal for coaching, send a single shot and pause for feedback. Timer Mode: Start play in 10, 20, 30, or 40 seconds to prepare before a drill starts. Enhanced Convenience Randomisation: Randomise speed, spin, and interval for varied training. Manual Remote Mode: Quickly choose a single position on the court or make finer adjustments with auto-calculation based on speed and spin. Over-the-Air Updates Continuous Improvement: With our dedicated internal development team, receive frequent updates and long-term support for both the machine and software. User-Friendly Interface Intuitive Controls: Effortlessly adjust settings with a user-friendly interface, making it simple to fine-tune your training sessions. Remote Operation: Control the machine remotely, allowing for seamless adjustments during practice without interrupting your flow. Multi-Language Support Language Options: Available in English, Spanish, German, and Chinese, with more languages coming soon. Dark/Light Modes: Choose between dark or light modes for optimal visibility. Why Choose Our Tennis Training Machine App? Enhance Your Skills: Whether you're a beginner or a seasoned pro, our app helps you improve your skills faster and more efficiently. Professional-Grade Training: Train like the pros with an app trusted by coaches and players worldwide. Unmatched Convenience: Enjoy the flexibility of practising whenever and wherever you want, without the need for a practice partner.
Screenshots
Verdict
The clearest difference is price: Spinfire Pro 2 at Free against RacquetTune's $2.99. Spinfire Pro 2 also leads on update cadence (monthly vs every 3 months). RacquetTune's advantage is chart position (#11 vs unranked). On ads, in-app purchases, 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
Spinfire Pro 2 is free to download; RacquetTune costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
RacquetTune ships an update every 3 months, Spinfire Pro 2 monthly. The most recent releases landed on October 20, 2026 and October 10, 2026 respectively.
| Parameter | RacquetTune | Spinfire Pro 2 |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.6 (474 ratings) — better | — |
| Positive reviews | 72.7% of reviews | — |
| Number of ratings | 474 — better | — |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Best chart rank | #11 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 11 MB | 54 MB |
| Age rating | 4+ | 4+ |
| Developer | Sten Kaiser | The trustee for The Fry Developments Trust |
Bugs and requests
RacquetTune
Reported bugs
4 issues- App crashes when trying to delete rackets
- String factor database not working properly
- Inconsistent readings on the same racket
- Struggles with rackets with built-in dampers
Requested features
5 requests- Add more strings to the database
- Allow logging of playing hours
- Improve history/graphing features
- Support for hybrid string setups
- Add racket database for easier setup
Spinfire Pro 2
Not enough reviews yet to summarise bugs or requests.
In-app purchases
RacquetTune
No in-app purchases
Spinfire Pro 2
No in-app purchases
Questions
Is RacquetTune free?
Is Spinfire Pro 2 free?
Do RacquetTune or Spinfire Pro 2 have ads?
Which is updated more often, RacquetTune or Spinfire Pro 2?
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