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marker.js VS RepDB

Compare marker.js VS RepDB and see what are their differences

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marker.js logo marker.js

Add image annotation feature to your web apps

RepDB logo RepDB

Exercise dataset for fitness apps: transparent background, animations, no subscription
Visit Website
  • marker.js Landing page
    Landing page //
    2023-05-04
  • RepDB Standard exercise dataset
    Standard exercise dataset //
    2026-08-15
  • RepDB Starter tier
    Starter tier //
    2026-08-15

RepDB is a one-time-purchase exercise dataset with animations for developers building fitness and workout apps — 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 600+ exercises with flat-style 512×512 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 — 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.

marker.js

Website
markerjs.com
Pricing URL
-
$ Details
-
Platforms
-
Release Date
-
Edit details

RepDB

Website
repdb.co
Pricing URL
Official RepDB Pricing
$ Details
freemium $299 / One-off
Platforms
Web Mobile
Release Date
2026 July
Edit details

marker.js features and specs

  • User-Friendly Interface
    Marker.js provides an intuitive and easy-to-use interface for users to annotate images quickly without needing extensive technical knowledge.
  • Real-time Collaboration
    The tool supports real-time collaboration, allowing multiple users to work on the same annotation project simultaneously, which enhances teamwork efficiency.
  • Customizable Annotation Tools
    Marker.js offers a variety of customizable annotation tools, enabling users to tailor their annotation experience according to specific needs.
  • Cross-Platform Compatibility
    The software is compatible with various web technologies and can be seamlessly integrated into different platforms and applications.
  • Lightweight and Fast
    Being a lightweight solution, Marker.js loads quickly and performs efficiently, which is ideal for web applications with performance constraints.

Possible disadvantages of marker.js

  • Feature Limitations
    While Marker.js offers a solid set of annotation tools, advanced users might find it lacking in features compared to more comprehensive annotation software.
  • Dependency on Web Environment
    As a web-based tool, Marker.js relies on an internet connection and compatible browsers, which may not suit environments that require offline access.
  • Potential Learning Curve
    New users may experience a learning curve when first using Marker.js, particularly if they are accustomed to different annotation tools.
  • Limited Support for Specialized Use Cases
    Organizations with highly specialized annotation needs might find Marker.js less suitable, necessitating additional tools or custom solutions.

RepDB features and specs

  • WebP Format Benefits
    start+peak exercise images
  • JSON
    relations, metadata, equipment
  • Transparency
    transparent background
  • Animations
    Animated loops in paid tier

Category Popularity

0-100% (relative to marker.js and RepDB)

marker.js

RepDB

Tech
100 100%
Tech
0% 0
Datasets
0 0%
Datasets
100% 100
Developer Tools
54 54%
Developer Tools
46% 46
Art
100 100%
Art
0% 0

Questions & Answers

As answered by people managing marker.js and RepDB.

What makes your product unique?

RepDB's answer:

RepDB is sold as a one-time download, not a metered API — 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.

What's the story behind your product?

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.

Why should a person choose your product over its competitors?

RepDB's answer:

Most alternatives are subscription APIs — 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.

How would you describe the primary audience of your product?

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.

User comments

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What are some alternatives?

When comparing marker.js and RepDB, you can also consider the following products

Pixelmator - Pixelmator is an image-editing application for Mac and iPad.

Timezone.io - Keep track where and when your team is.

NFTPort - Turn anything into an NFT with a single API call

Annotable - Ultimate image annotation & markup tool

NFT of the Day - Your daily dose of the best NFTs

Jesi.app - An always up to date timezone widget for your email

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