Trackkarma vs Jamzo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Trackkarma
This app simplifies league management for sports teams, centralizing practice sessions, game organization, skill tracking, and communication. It offers an intuitive interface for coaches and members to manage attendance, rosters, and performance data.
- Practice session creation and attendance tracking
- Game organization and roster management
- Skill achievement tracking
- Centralized document sharing
- League-wide communication tools
- Event calendar and notifications
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Managing a league can be complicated. Between the data lost in spreadsheets and the information scattered on social networks, communication between members is not always easy. With Trackkarma, we provide a powerful and intuitive application to eliminate these inconveniences and help you manage your league without the fuss. Developed by and for the derby community, Trackkarma aims to be as complete as possible while being accessible to anyone. The many features have been designed to be easily usable thanks to an intuitive and refined interface, accessible on computers, tablets and smartphones. PRACTICE SESSIONS Training is the basis of the life of your league, but monitoring each member is sometimes complicated. Simplify their management and eliminate inconvenience thanks to Trackkarma and its advanced features: • Create single and recurring sessions • Individual and team attendance tracking • Program preparation by trainers • Calculation of minimum attendance rate required • Charts and summaries of attendance for the season GAMES The organization of games requires quite substantial logistical work. This is sometimes complicated by difficult communication and the scattering of relevant documents and information. Trackkarma makes it all very easy, while offering innovative features! • All practical information gathered in one place • Availability request and attendance calculation • Creation and export of rosters • Creation of the game officials crew among the officials of your league or by inviting external officials • Import of WFTDA Stasbooks and graphical visualization of game statistics MINIMUM SKILLS The career of roller derby players necessarily begins with learning basic skills. These minimum skills are an essential prerequisite to guarantee a good preparation for the competition. Trackkarma offers several tools to assist in this learning. • List of skills required to be assessed • Feedback from coaches • Skill achievement tracking charts • Summary of the evolution of skills COMMUNICATION Sharing information between league members is not always easy. Between the messages exchanged on social networks and the documents shared in a hazardous way, it is easy to miss crucial communications. Trackkarma eliminates all these worries! • Centralization and sharing of documents • Discussions and messages • Notifications • Shared calendar
Jamzo
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Jamzo brings together essential tools to support teams and officials during roller derby games. NEW — LINEUP & PENALTY TRACKER Easily track lineups and penalties throughout the game: • Record the skaters participating in each jam • Identify jammers, pivots, and blockers • Assign penalties and track Penalty Box visits • View the game history in real time • Work independently or with another operator on separate devices • Access a complete game recap • Export game data for review or archiving SCOREKEEPER • Record the score jam by jam • Follow the game’s progress in real time • Choose between solo and dual modes • View and export the game recap TIMING TOOLS • Jam Timer: track jams, intervals, and periods • Penalty Timer: time Penalty Box visits • Blocker Timer: manage blocker penalties • Jammer Timer: manage jammer penalties • Dual Timer: use two timers on a single screen TEAM DIRECTORY • Discover roller derby teams • View their city and country • Access their social media pages RULES QUIZ • Test your roller derby knowledge • Choose your difficulty level • Learn and review the rules in a fun way Jamzo features a clear, responsive interface designed to remain easy to use in real game conditions.
Screenshots
Verdict
The clearest difference is update cadence: Trackkarma at every 2 weeks against Jamzo's every 6 weeks. 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.
Trackkarma ships an update every 2 weeks, Jamzo every 6 weeks. The most recent releases landed on September 17, 2026 and September 3, 2026 respectively.
| Parameter | Trackkarma | Jamzo |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 46 MB | 44 MB |
| Age rating | 4+ | 17+ |
| Developer | Christophe Goffart | Charles Robart |
In-app purchases
Trackkarma
No in-app purchases
Jamzo
No in-app purchases









