Diagnostic Audit

What's actually slowing down my Shopify Plus store?

I go through every app and script your store loads and work out which ones earn their place. You get the answer in writing, with what I'd cut first.

Book a Diagnostic Audit

$500, $1,000 or $1,500

Written report within 7 business days

First, a 30-minute call. You'll know the exact price before you commit to anything.

A store I worked on

What the cutting did on one store

Fully loaded time1.5swas 37.3s · 96% less

Files loaded33was 227 · 194 removed

Page size847 KBwas 4.98 MB · 83% smaller

Three apps came out and I rebuilt what they did in the theme. Scripts left by uninstalled apps came out too.

Measured in GTmetrix, a page-speed testing tool, one report before and one after. The three figures come from the whole rebuild together.

What you get

What's in the report

One written report that you can forward to your boss or hand to your developer. If I don't find anything worth fixing, the report says so.

Diagnostic Audit reportSeven parts

Part 1

A summary you can forward

Three sentences at most: what I found, what it costs you and what I'd do about it.

Part 2

Every app and what you pay for it

The apps running on your store, each with its monthly charge from your Shopify billing page. Every one gets a verdict: keep, replace or remove.

Part 3

Code that uninstalled apps left behind

An app's code can stay in your theme after you uninstall it. I list every piece I find and say whether it slows your pages or is only clutter.

Part 4

App scripts that stop on March 1, 2027

Some apps still add their scripts to your storefront the old way. Shopify stops loading those on March 1, 2027, and the feature each one runs stops with it unless the app moves to Shopify's newer method. I list each one, which app it belongs to, and whether that app is worth keeping before it has to switch.

Part 5

What your pages load today

Google PageSpeed Insights on mobile, the median of five runs, for your home page, a product page, a collection page and the cart, plus the number of requests each page makes. It's dated, so you can measure any later change against it.

Part 6

What I'd do first

The five changes I'd make, in the order I'd make them. Where a change ends an app charge, the report shows the amount from your billing page.

Part 7

What I'd keep, and why

Every app I'd leave alone, with the reason. If your email or loyalty app is doing its job, it's on this list.

How it starts

A 30-minute call comes first.

01 · Book

You tell me about your store.

Your store URL, roughly what you pay for apps and the question you most want answered. Then you pick a time.

02 · Call

You and I talk for 30 minutes.

It's a video call and it's free. I'll have looked at your storefront beforehand, so I'll bring two or three things I already noticed. Five questions about your store set the price: $500, $1,000 or $1,500. If an audit won't help, I'll tell you that instead.

03 · Decide

You decide.

If you go ahead, you pay the fixed price and give me collaborator access to your store: a Shopify login just for me, which you can remove at any time. You and I agree on a short brief, so the audit answers your question. The report arrives within 7 business days of the day I have both the access and the brief.

After the report

Who builds it is up to you.

With your own developer

Your developer or agency builds from the report.

I write the report so they can follow it without me. There's nothing more to pay.

With me

I build it as an Architectural Overhaul.

You get a proposal with the scope, the timeline and the price. It also shows what keeping each app and replacing it would cost over 36 months, worked out from your own billing and order numbers. If a build of $5,000 or more starts within 90 days of your report, the audit fee comes off it in full.

Architectural Overhaul · $5,000–$15,000+ · 3–6 weeks

See what I build →

Questions before you book

$500, $1,000 or $1,500, depending on your store. I confirm which one on the first call, before you commit to anything.

Your store	Audit price
Fewer than 15 apps, one storefront, not on Shopify Plus	$500
15 apps or more, or on Shopify Plus	$1,000
Any one of these: on Plus with custom checkout or discount features built for your store, a B2B store, or more than one storefront	$1,500

Read from the $1,500 row up. The first row your store matches is your price. It's fixed before the work starts, and it doesn't change with what I find.

No. Booking starts with a 30-minute call, and the call is free. You decide about the audit afterwards.

I do. FosterUI is just me, so the person on the call is the person who writes your report.

No. If an app does a job Shopify can't do itself, like your email and SMS app or your loyalty program, it stays, and I look at making its widget lighter. Subscription apps get a closer look, because Shopify has its own subscriptions app. Yours stays if your store uses something Shopify's doesn't do, and the report names what that is. The report lists every app I'd keep and why.

The report says so. You still get the measurements and the app list, as a dated record to compare against later.

Collaborator access to your store, a screenshot of the app charges on your Shopify billing page, and a short brief that you and I fill in together. I don't change anything on your store during the audit, and you can remove my access as soon as the report arrives. If your team limits collaborator access, tell me on the call and I'll work around it.

The written report arrives within 7 business days. The count starts on the day I have access to your store and you and I have agreed on the brief.

I can, or your own developer can. If you want me to, I build them as an Architectural Overhaul, priced from the report and starting at $5,000. If a build of $5,000 or more starts within 90 days of your report, the audit fee comes off it in full. If you'd rather use your developer or agency, I write the report so they can follow it without me.

No. I've built on Shopify for 12 years, the past six exclusively on Plus, but the audit works on any Shopify plan. A few fixes do need Plus. A custom bundle discount built as a Shopify Function is one, because custom apps that use Functions only run on Plus, and the report marks those. If you upgrade through my Shopify partner referral, Shopify pays me a one-time referral fee. I'd rather you knew that up front.

Start with a Diagnostic Audit.

You get a written report of what I'd cut and what I'd keep, in the order I'd do it. If I don't find anything worth fixing, the report says so.

$500, $1,000 or $1,500 · delivered within 7 business days

First, a 30-minute call. You'll know the exact price before you commit to anything.

Not ready to book? Work out what your apps cost over three years →

Book a Diagnostic Audit