Honestly the comments are a good example on how difficult it is to sell to developers and why startup ideas that target developers are dangerous to bootstrap. Developers have high incomes, but are quite frankly, extremely cheap. And I actually mean cheap and not frugal. They will spend 40 hours/week for months to save $5/mo. There's basically no logic apart from that developers have a poor concept of time and money a…
I have paid for Kaleidoscope at least four times and each time was more expensive (I think the total I spent was about US$300—probably closer to CA$450). I justified it because it was the best-in-class Mac-assed Mac app for its purpose and it really did and does save me time or frustration.
I’d have happily paid another US$150 (~CA$200 today) for an upgrade to Kaleidoscope 4. I’m just not sure that I want to pay a variable amount per month amounting to US$96 (~CA$115) annually, because I already have subscriptions that I’m paying for which I don’t use enough (WebSequenceDiagrams is a good example; I happily pay, because when I need it I really need it and there’s nothing quite as good IMO).
I know it’s hard, but subscriptions are the wrong choice most of the time, unless you can review and manage them in one place like you can with the Apple App Store. Because otherwise, you have to trust the company to not only (a) keep the subscription price fair without surprise increases but also (b) not use Adobe-level or NYT-level dark patterns for cancellation.
I’m not cheap, but I am far more price sensitive to subscriptions than I am to one-off purchases. The bar for getting me to subscribe rather than buy is ten to twenty times higher, and most subscription software isn’t that much better.