Theme Drift: Compare & Diff vs Theme Upgrade Buddy
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 23, 2026 for Theme Drift, Feb 19, 2026 for Theme Upgrade Buddy.
The short answer
- Only Theme Drift lists a free plan.
Head to head
2 Theme Comparison
- · Compare two theme versions side by side
- · Full file-by-file change list
- · Image, video and font previews
- · Line-by-line diff with syntax highlighti
- · Liquid, JSON, CSS and JavaScript support
- · No credit card required
AI Report Credits
- · 1 credit for $1
- · 15 credits $12, 20 credits $15
- · 3 Theme Comparison includes 5 credits
- · 5 credits $4.50, 10 for $8.50
- · AI report: 1 credit (3-way: 2 credits)
- · Buy 1 to 20 credits at a time
3 Theme Comparison
- · Added/removed line counts per file
- · Compare base, yours and new theme
- · Full line-by-line view for 3-way diffs
- · Includes 5 AI change report credits
- · No subscription
- · Pay once, use it forever
Theme Update
- · Add-ons for rush delivery, more
- · Custom theme migration, done for you
- · Delivered on a duplicate theme
- · One-time payment, no subscription
- · Preserves your customizations
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureTheme Drift lets you compare two or three Shopify themes at once. With three, compare the original theme, your customized live theme, and a new theme version side by side. When a theme you've customized gets an update, it's hard to tell which changes are your own edits and which are new from the developer.
When you upgrade your Shopify theme version, custom code and styles may differ between versions. This app compares your current theme with a new version and shows every difference. Works with ANY theme, not just specific vendors. Files are grouped by risk level so you know what needs attention first. Review changes in a side-by-side diff viewer, copy custom code with one click, and download a report.
- Compare two or three theme versions at once
- In three-way mode, see the original, your changes, and the update
- See conflicts where you and a new theme version changed the same file
- Line-by-line view for Liquid, JSON, CSS, and JavaScript theme files
- Compare any two themes and instantly see every difference between them
- Side-by-side code viewer highlights exactly what changed in each file
- Files sorted by risk level so you tackle critical changes first
- Download a full report to track progress and share with your team
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  Theme Drift |  Theme Upgrade Buddy |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | Theme Drift | Theme Upgrade Buddy |
|---|---|---|
| App Store rating | Not published | Not published |
| App Store reviews | Not published | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | Theme Drift | Theme Upgrade Buddy |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | No monthly plan listed | No monthly plan listed |
| Longest free trial | Not listed | Not listed |
| Plans listed | 4 | Not published |
Listing
| Measure | Theme Drift | Theme Upgrade Buddy |
|---|---|---|
| Shopify category rank | #48(ahead) | #120 |
| Shopify App Charts | #4 on Pricing moves in Storefronts - Other | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Sep 18, 2026 | Jan 1, 2026 |
| Languages | 1 | 1 |
| Developer | Ionia Studio | HASAN ARMSTRONG LLC |
FAQ
Theme Drift and Theme Upgrade Buddy: common questions
- Is Theme Drift or Theme Upgrade Buddy cheaper?
- Only Theme Drift lists a free plan. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Oct 23, 2026 for Theme Drift, Feb 19, 2026 for Theme Upgrade Buddy; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Oct 23, 2026 for Theme Drift, Feb 19, 2026 for Theme Upgrade Buddy. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.