Has anybody got any suggestions for a device for monitoring gas usage?

We’ve been happily using the Loop Energy Saver for the past couple of years, the gas component sticks on to the meter front panel and monitors the dial rotations. It’s been excellent for showing us the impact of various things (e.g. working from home) on our gas bill.

Problem is, they’ve decided to discontinue it, and although they are offering electric monitor users an upgrade path, they aren’t supporting the gas portion going forwards. Remind me NEVER to buy a device that requires an external server to get data from my front door to my computer...

I can’t find any alternative anywhere. Any ideas?