Minimalist Weightlifting Tracker?

I'm looking for a self-hosted lifting tracker, preferably with web and mobile apps, that supports

1. Tracks weights, reps

2. Workout templates

3. Apps can be used offline

4. Supports syncing between apps (hence self-hosted)

And preferably with no additional tracking features (no nutrition, endurance activity-specific features, etc). This rules out apps like SparkyFitness.