Spacebooker vs Founta Lab
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Spacebooker
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Spacebooker ist die kostenlose und smarte Lösung für Tennisvereine. Die App ermöglicht eine blitzschnelle und intuitive Platzbuchung in unter fünf Sekunden – bequem per Smartphone oder am Desktop. Doch Spacebooker ist mehr als nur ein reines Buchungssystem: Wir bringen Menschen zusammen. Mit der integrierten Spielpartnersuche und der Chat-Funktion stärkt Spacebooker das soziale Miteinander im Verein. Spielerinnen und Spieler finden mühelos zueinander – ein unschätzbarer Vorteil besonders für Neumitglieder oder Tennis-Rückkehrer*innen. Für Vereinsverantwortliche bietet das Admin-Panel die volle Kontrolle bei minimalem Aufwand. Verwalte Einzel- und Dauerbuchungen, organisiere deine Mitglieder, nutze den Vereins-Chat und erstelle individuelle Gruppen mit eigenen Buchungsregeln. Spacebooker vereint effiziente Organisation und eine lebendige Gemeinschaft in einer einzigen App – klar, schnell und absolut benutzerfreundlich.
Founta Lab
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Founta Lab is the recording app of the Founta research project: together we are building a dataset of tennis serves used to train serve-analysis models. Record your own serves right on the court. Your clips upload automatically and robustly — even on a poor connection — and enter the research corpus once you confirm them. You always see what happens with your footage: upload status, detected serves, and your contribution on the team leaderboard. ACCESS BY APPROVAL ONLY Founta Lab is a research project, not an open social network. After signing in with Apple you need an access code, or a manual approval by our team. That is how we make sure nobody — especially no minors — ends up in the dataset without deliberate, verified consent. No code yet? Write to us: contact@tkmedia.lu FEATURES • Guided serve recording with automatic on-device serve counting • Automatic upload that resumes after connection drops • Your recordings at a glance: status, detected serves, points • Leaderboard and team goals for approved members • Player profiles for children — created and managed exclusively by parents or guardians, with explicit consent • Delete your account any time, directly in the app PRIVACY Your footage is used exclusively for research on serve-analysis models — never for advertising and never sold to third parties. Details: https://founta-labeling-privacy.vercel.app/datenschutz Operated by TK MEDIA S.à r.l.-S, Luxembourg.
Screenshots
Verdict
The clearest difference is ads: Founta Lab at none against Spacebooker's shown. Spacebooker's advantage is device support (3 vs 1) and iOS requirement (14.0 vs 18.0). On price, update cadence and in-app purchases 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.
Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on November 4, 2026 and October 29, 2026 respectively.
| Parameter | Spacebooker | Founta Lab |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 59 MB | 139 MB |
| Age rating | 4+ | 4+ |
| Developer | Spacebooker GmbH | Tun Keltesch |
In-app purchases
Spacebooker
No in-app purchases
Founta Lab
No in-app purchases





