Firebase Authentication
Auth0
Spring Security
JSON Web Token
OAuth2
Devise
Amazon Cognito
OmniAuth
RepDB
RepDB is a one-time-purchase exercise dataset for developers building fitness and workout apps โ not a subscription, not a rate-limited API. You download the data once and own it: JSON (and SQLite on the higher tier), WebP images, and full EN/DE/ES translations, with no per-request billing and no dependency on our servers staying up.
A free tier includes 400 exercises with flat-style 512ร512 images, attribution-licensed for commercial in-app use. The Starter tier ($199) adds the full catalog in classic white-background style. Standard ($399) adds transparent 1024px images, looping animations, exercise relations (similar/progressions/regressions), workout templates, and embeddings โ exclusive to that tier.
Every exercise includes muscle-group highlighting, equipment/muscle icons, MET values, and safety/goal tags. Compared to GIF- or JPG-based competitor APIs, RepDB images are transparent WebP with no watermarks, so they drop into any app UI without a white box around them.
Firebase Authentication RepDBFirebase Authentication is recommended for developers who are building web or mobile applications that require secure user authentication, particularly if they are already using other Firebase services, or those who are looking for an easy-to-integrate solution with extensive support for various authentication providers and strong backend integration capabilities.
RepDB's answer:
RepDB is sold as a one-time download, not a metered API โ you own the JSON/SQLite data and WebP images outright, with no rate limits, no per-request billing, and no risk of the vendor cutting off access. It's also the only dataset in this space with EN/DE/ES translations, transparent (alpha-channel) images with no watermark, muscle-group highlighting, safety/goal tags, and looping animations on the higher tier.
RepDB's answer:
RepDB grew out of a consumer workout app its creator was building solo. Sourcing exercise images and data meant either paying for a subscription API with usage caps and no caching rights, or producing everything from scratch. The illustrated, multi-language dataset was built for us first, then split out as its own product once it became clear other indie developers had the same problem and preferred to buy the data outright rather than rent it through an API.
RepDB's answer:
Most alternatives are subscription APIs โ you pay monthly, you're capped on requests, and ExerciseDB's terms of use explicitly forbid caching or storing the data at all, so every image render is a live paid API call. RepDB is the opposite: pay once, download the files, self-host with zero ongoing dependency. It's also the only option offering true DE/ES localization and transparent images instead of a white box behind every exercise.
RepDB's answer:
Solo developers and small teams building fitness or workout-tracking apps (iOS, Android, web) who need licensed exercise images and structured exercise data, but don't want to build their own media pipeline or depend on a rate-limited third-party API.
Based on our record, Firebase Authentication seems to be more popular. It has been mentiond 52 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You can find detailed setup instructions in the official Firebase docs. - Source: dev.to / 7 months ago
While building a Next.js app with Firebase Authentication (email/password), I encountered a frustrating issue โ users could sign up multiple times with the same email address, creating duplicate entries in my Firestore database. - Source: dev.to / 9 months ago
Firebase Authentication simplifies the process of user authentication with pre-built UI libraries and SDKs. It supports multiple sign-in methods, including:. - Source: dev.to / over 1 year ago
Firebase is another BaaS platform, featuring slightly more mature versions of all of Supabase's auth features. You could argue Firebase is more well-suited for mobile applications that need authentication. Additionally, their infrastructure and feature-set is pretty advanced thanks to their acquisition by Google. If you're building an API on Firebase, we have articles on creating an API, and adding API key... - Source: dev.to / over 1 year ago
In this tutorial, we'll explore Firebase Authentication and walk you through the step-by-step process of securing Node.js apps by integrating Firebase authentication providers. - Source: dev.to / about 2 years ago
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
Spring Security - The Spring portfolio has many projects, including Spring Framework, Spring IO Platform, Spring Cloud, Spring Boot, Spring Data, Spring Security...
JSON Web Token - JSON Web Tokens are an open, industry standard RFC 7519 method for representing claims securely between two parties.
OAuth2 - Application and Data, Application Utilities, and User Management and Authentication
Devise - Flexible authentication solution for Rails with Warden.
Amazon Cognito - Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.
