I always pick paid software where i can, to support developers, to avoid ads, and you feel i have an app working for my interests. There's no price guide available when signing up for this app, but it's emailed during the 'free trial'. $100 per year. That's just ludicrous. It's perhaps worthy of $10 altogether, considering it's specialist market, or $3 per year considering the possibility of ongoing development (though on a pc, putty hadn't needed significant updating for decades). Anyway, bye!