What have you found the best way to track your paid advertising experiments to be?
I've gotten to the point where I've found product-market fit and have thus moved on to trying some paid advertising channels. These include Google Adwords, Facebook Ads, and Pinterest (for my particular product), and I've had a little bit of success with them (namely Google). However, I've finding it difficult to keep track of all of them at once, and I'm literally determining ROAS through hand calculations.
In addition, trusting the "conversions" of each individual platform's solutions - say, Google Analytics and AdWords - is actually not really good as well, because I've found when comparing my own analytics - through Shopify which I regard as my source of truth - and Google Analytics, they are worlds apart in terms of the numbers they spit out. However, I would e.g. definitely trust the "cost" of each ad there.
Is there any platform that allows you to mix and match your ad platforms together, so I can get one beautiful visualization of what's happening with my business? Such an idea was also mentioned in a podcast with the egghead.io founder I believe, and I agree with his sentiment that this is totally something that I would subscribe to/pay for if it existed.
Otherwise, if there's no such thing, I'll probably tie together a few Zapier integrations (not being super good at coding) and release them or something.
In my previous e-commerce startup we used a tool called funnel.io https://funnel.io/. It pulls together pretty much any paid channel data and you can feed that info to other tools. It was not me who worked with the tool, so I can't give vow for it. It sounds however like what you are looking for.
I use Google Analytics with Google Tag Manager, I think your probably a bit further along than me but those two together seem pretty potent.
I don't see anything affordable to pull all kpi's together. Most folks use google analytics. I look at a campaign management tool, that charts data for each. Campaignchain.