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About

You never extend classes and you rarely implement interfaces. Javalin is just a few thousand lines of code on top of Jetty, and its performance is equivalent to raw Jetty code. Due to its size, it's very easy to reason about the source code. Other Java and Kotlin web frameworks usually offer one version for each language. Javalin is being made with inter-operability in mind, apps are built the same way in both Java and Kotlin. Javalin runs on top of Jetty, one of the most used and stable web servers on the JVM. You can configure the Jetty server fully, including SSL and HTTP3 and everything else that Jetty offers. Many lightweight Java and Kotlin web frameworks don't support OpenAPI, but Javalin does.

About

Jetti is a web app for gym, martial arts academy, and boutique studio owners that turns your own member data into a clear monthly read on the business and a prioritized list of the members to act on. Export your members and billing from any CRM (MyStudio, Kicksite, Zen Planner, PushPress, Gymdesk) and upload the CSV. Jetti auto-detects your columns and shows how you're trending across acquisition, conversion, retention, and revenue: - Dashboard with MRR and cash-basis revenue views - Trial-to-member conversion and acquisition vs. churn - A named, explained worklist of who's likely to cancel, whose pass is expiring, and which trials never converted, each with the reason, the revenue at stake, and a next step - Goal forecasting with gap-to-goal - AI-drafted retention messages and an assistant you can ask about your own numbers Runs alongside your existing gym software, not instead of it.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Developers searching for a simple web framework solution for Java and Kotlin

Audience

Independent gym, martial arts and jiu-jitsu academy, and boutique fitness/studio owners, plus operators of other small membership and subscription businesses, who manage their own member billing, growth, and retention. Best fit: owner-operated, single or few locations.

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

No images available

Pricing

No information available.
Free Version
Free Trial

Pricing

$149
Free Version
Free Trial

Reviews/Ratings

Overall 5.0 / 5
ease 4.0 / 5
features 5.0 / 5
design 5.0 / 5
support 5.0 / 5

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

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Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Javalin
javalin.io

Company Information

Jetti
Founded: 2025
United States
jetti.com

Alternatives

Ktor

Ktor

JetBrains

Alternatives

Eclipse Jetty

Eclipse Jetty

Eclipse Foundation
GymPoint

GymPoint

ZeroPoint Digital
MappyField 365

MappyField 365

AppJetty
Traqade

Traqade

Gympik

Categories

Categories

Integrations

Java
Kotlin

Integrations

Java
Kotlin
Claim Javalin and update features and information
Claim Javalin and update features and information
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Claim Jetti and update features and information