Theme Drift: Compare & Diff vs ThemeMerge
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, Nov 11, 2026 for ThemeMerge.
The short answer
- Both list 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
Free plan
ThemeMerge PRO
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 build a redesign on a copy of your theme, edits made to the live theme in the meantime are lost on publish. ThemeMerge compares both themes against a baseline you record when the copy is made, so it knows what each side changed. Theme editor JSON merges key by key, keeping sections added on either side. Liquid, CSS and JavaScript merge line by line.
- 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
- Three-way compare of live theme and working copy against a recorded baseline
- Theme editor JSON merged key by key, so sections added on both sides are kept
- Section and block order merged so both sides' additions stay in place
- Resolve conflicts one at a time, per file, or by editing the result directly
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 | |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | 0 | Not enough data |
| 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 | |
|---|---|---|
| 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 | |
|---|---|---|
| Free plan | Yes | Yes |
| Lowest paid monthly plan | No monthly plan listed | $15/month |
| Longest free trial | Not listed | Not listed |
| Plans listed | 4 | 2 |
Listing
| Measure | Theme Drift | |
|---|---|---|
| Shopify category rank | #53 | Not enough data |
| Shopify App Charts | #2 on Pricing moves in Storefronts - Other | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Sep 18, 2026 | Nov 11, 2026 |
| Languages | 1 | 1 |
| Developer | Ionia Studio | LazyDay Labs |
FAQ
Theme Drift and ThemeMerge: common questions
- Is Theme Drift or ThemeMerge cheaper?
- Both list 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, Nov 11, 2026 for ThemeMerge; 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, Nov 11, 2026 for ThemeMerge. 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.