StringTracker vs Tension Lab
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
StringTracker
Read full descriptionHide full description
StringTracker helps tennis players keep track of racket string life with a simple, focused workflow. Add your rackets, record when they were last strung, and update playtime after each session. StringTracker keeps a clear running total of hours played on each string job, so you can decide when it is time to restring based on your own playing habits. Track multiple rackets: Keep all your rackets in one place and see their current string age at a glance. Log playtime quickly: Add or subtract playtime with simple swipe actions using your preferred time increment. Set your restring target: Choose the number of play hours you consider optimal before restringing. Mark rackets as restrung: Reset playtime when you restring a racket while keeping your tracking simple. Organize your list: Rename, reorder, or remove rackets as your setup changes. StringTracker is built for players who want a lightweight way to manage racket maintenance without spreadsheets, notes, or complicated session logs.
Tension Lab
Read full descriptionHide full description
Your strings change every time you play. Tennis Tension Lab helps you see that change before it surprises you on court. Place your phone beside the racquet and tap the center of the string bed three to five times. The app analyzes the sound on your device and gives you a repeatable tension estimate in seconds. KEEP YOUR SETUP CLEAR • Check current string tension • Compare each reading with the baseline from a fresh string job • Follow tension loss on a simple timeline • See when it may be time to restring • Keep every racquet, string job, hybrid setup and note together • Find models quickly in a catalog of 1,347 racquets and 216 strings • Compare string characteristics before choosing your next setup MADE FOR THE COURT No account is required to start. Tap audio is analyzed in memory and discarded; only measurement results are saved. Choose lb or kg and keep your history organized by racquet. For the most consistent results, measure the same racquet in a quiet place with the same tapping method. Readings are estimates based on sound and equipment information, not certified measurements from a stringing machine.
Screenshots
Verdict
The clearest difference is update cadence: Tension Lab at every 4 days against StringTracker's every 19 months. On price, ads, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
StringTracker ships an update every 19 months, Tension Lab every 4 days. The most recent releases landed on October 3, 2026 and October 31, 2026 respectively.
| Parameter | StringTracker | Tension Lab |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 19 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 32 MB | 76 MB |
| Age rating | 4+ | 4+ |
| Developer | Rays Of Space Oy | SEOKWON KONG |
In-app purchases
StringTracker
No in-app purchases
Tension Lab
No in-app purchases
Questions
Is StringTracker free?
Is Tension Lab free?
Do StringTracker or Tension Lab have ads?
Which is updated more often, StringTracker or Tension Lab?
Other comparisons















