Blog
Product updates & articles
New releases, feature drops, and write-ups on building fitness apps.
Muscle visualization for fitness apps: every option compared
The complete 2026 map of muscle visualization for app developers: SVG libraries, Lottie packs, pre-rendered images, DIY canvas, and interactive Rive assets.
Read moreMuscle map libraries for Flutter, compared
Every Flutter muscle map option in 2026: the pub.dev SVG packages, building your own with CustomPaint, and the Rive route. Honest tradeoffs for each.
Read moreHow to show worked muscles in a fitness app
The four ways to render a muscle-highlight view in 2026, static images, SVG highlighters, Lottie, and state-machine assets, and how to pick for your app.
Read morereact-native-body-highlighter alternatives for muscle visualization
An honest look at react-native-body-highlighter, when the free SVG approach is enough, where it hits walls, and what the alternatives actually offer in 2026.
Read moreBuilding an open-source Flutter workout tracker with a Rive muscle heatmap
FitnessBuddy is a free, open-source Flutter workout tracker built around our Rive muscle heatmap asset. The architecture, the code, and the repo.
Read moreMuscle heatmap update: female body shape support
Both Rive muscle heatmaps just got a major update: a female body shape, refreshed male artwork, and a new back muscle (teres major). Free for all current owners: Basic v2.0 and Advanced v3.0.
Read moreRive vs Lottie for fitness app animation
Honest comparison of Rive and Lottie for fitness, training, and rehab apps. Lottie plays animations; Rive runs systems. Where each one wins, and how to choose.
Read moreHow to add an interactive muscle heatmap to a Flutter app
Step-by-step: drop a muscle heatmap into a Flutter fitness or rehab app with a free, open-source Rive asset and a ~20-line widget. About 10 minutes.
Read moreAdvanced Heatmap v2.0: click any muscle to identify it
The Advanced Rive muscle heatmap just gained click-to-identify. Tapping a muscle emits its specific name and its broader muscle group, so you can drive exercise filters, anatomy quizzes, and recovery views off the same animation.
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