Convertify
Median.co
Web2Apk
Sheety
Website 2 APK Builder
PhoneGap
WebViewGold
Sheet 2 Site
RepDB
Convertify helps businesses create quick native apps using just a website URL. If you already have a responsive website, we wrap it and deliver your app in less than 24hrs so you can submit it to the Play Store and App Store.
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.
Convertify RepDBConvertify is recommended for students, professionals, and anyone who frequently works with diverse file formats. It's particularly beneficial for content creators, graphic designers, and office professionals who require quick and high-quality file conversions.
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.
WebViewGold has also more features than Convertify
Stolen code of WebViewGold.com and no reply after receiving demo APK
They sent me a zip file but instead of being an app it was just junk that didn't work. They also convinced me to pay Publy, they should have taken care of the publication but Apple rightly refused it. App empty. NEVER BUY FROM THEM, they are just kids
Median.co - The most powerful webview app development platform. Build and maintain high-quality iOS & Android apps in your browser. Get started for free and turn any website into a full-feature mobile app in seconds.
Web2Apk - Convert website to Android app
Sheety - Turn any Google sheet into an API instantly, for free. Power websites, apps, or whatever you like, all from a spreadsheet. Changes to your spreadsheet update your API in realtime. Neat
Website 2 APK Builder - Convert your website or HTML web application into an Android App.
PhoneGap - Easily create apps using the web technologies you know and love: HTML, CSS, and JavaScript.
WebViewGold - Convert your web apps and websites to iOS & Android apps in 60 seconds.