ThemeMerge vs ThemeWatch: Compare Theme Code
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 11, 2026 for ThemeMerge, Oct 22, 2026 for ThemeWatch.
The short answer
- Only ThemeMerge lists a free plan. Paid plans start at $15/month for ThemeMerge and $4.99/month for ThemeWatch.
Head to head
Free plan
ThemeMerge PRO
Complete
- · File-By-File Breakdown
- · Line-By-Line Highlighting
- · Split & Inline Views
- · Unlimited Theme Comparisons
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureWhen 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.
Finally understand what's happening with your store's theme code without being a developer. Compare any two themes instantly and see exactly what's different between them - highlighted in a way that makes sense even if you've never seen code before.
- 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
- Side-by-side comparison of any two themes
- Line-by-line highlighting of all changes
- File-by-file breakdown showing which templates were modified
- Works instantly with all Shopify themes
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 |  ThemeWatch | |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | Not enough data | 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 | ThemeWatch | |
|---|---|---|
| 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 | ThemeWatch | |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | $15/month | $4.99/month(ahead) |
| Longest free trial | Not listed | 14 days |
| Plans listed | 2 | 1 |
Listing
| Measure | ThemeWatch | |
|---|---|---|
| Shopify category rank | Not enough data | #110 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Nov 11, 2026 | Feb 12, 2026 |
| Languages | 1 | 1 |
| Developer | LazyDay Labs | KIS Commerce |
FAQ
ThemeMerge and ThemeWatch: common questions
- Is ThemeMerge or ThemeWatch cheaper?
- Only ThemeMerge lists a free plan. Paid plans start at $15/month for ThemeMerge and $4.99/month for ThemeWatch. 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 Nov 11, 2026 for ThemeMerge, Oct 22, 2026 for ThemeWatch; 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 Nov 11, 2026 for ThemeMerge, Oct 22, 2026 for ThemeWatch. 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.