$500 and a weekend: 25 directory submissions or one $450 newsletter slot Directories

Neither as stated, but closer to B.

First, ignore the open rate. 22k at 38% is a number designed to be quoted. Ask for median clicks on the last five sponsor slots, and ask for a screenshot. If it comes back at 300-500 clicks and your landing page converts at 3%, that is roughly a dozen signups for $450, or $37 a signup. Whether that is good depends entirely on what a customer is worth to you, and you can do that division yourself.

Second, the directories: about 20 of your 25 are dead and exist to sell you a featured slot. But four or five of them genuinely rank, and a listing there is a permanent backlink plus a trickle for years. Do those five yourself on Saturday morning for free and skip the rest. That is two hours, not a weekend.

So: five directories for $0, keep the $500, and only buy the newsletter slot if the click numbers survive contact with an actual screenshot.

Third thing: spend $0 and spend the weekend writing 30 individual emails to people who have publicly complained about the exact problem you solve. They exist, they are findable, and they answer. $500 in a bootstrapped tool is two months of infrastructure — do not set fire to it before you know your pitch works on one person.

Did both last year on a similar tool, so here are actual numbers rather than opinions.

Directories: 25 submissions, 340 visits over three months, 9 signups, 1 conversion. Still trickling now, about 15 visits a week, which is free forever.

Newsletter: $600 slot, 620 clicks in 48 hours, 41 signups, 3 conversions. Then nothing.

Newsletter won on immediate revenue. Directories won on cost per visit over a year. Both were worth doing, neither was transformative.

Directories give you backlinks, not customers. That value is real and it compounds, but it shows up in month six, not next week. Newsletter gives you a spike and a bunch of signal about whether your positioning lands, and then it is gone.

If you need to know whether this thing works, buy signal. If you are confident it works and you need it to grow while you are back on contract, buy the compounding one.

Whichever you pick, instrument it before you spend. ?ref=whatever on every link and store the value on the user row at signup, not just in analytics. If you cannot attribute a paying customer back to a source you will learn nothing from either option and you will have this same argument with yourself in three months.

Put it into ads instead, the CPM is far better than $450 for one email.