Diffy Theme Tools 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 Oct 13, 2026 for Diffy Theme Tools, Oct 22, 2026 for ThemeWatch.
The short answer
- Paid plans start at $9.99/month for Diffy Theme Tools and $4.99/month for ThemeWatch.
Head to head
Compare Themes and Run Diff Checks Easily
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Complete
- · Compare Any or All Files
- · Compare Unlimited Themes
- · Keyword Search
- · Theme Backups
- · Theme History
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 featureSearch themes and search files for keywords in any of your themes with ease. Backup themes automatically. Track theme file changes over time. Compare themes for file differences (diff checks). Download a file or complete theme from any point in time. Click to go right to the Theme Editor. View file changes from one version to the next. View when a theme was published.
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.
- Compare Shopify themes files fast, find differences and changes.
- Theme file backup and downloads from any point in time, even after deletion.
- Search themes for keywords or code in your theme files easily and save time.
- Track changes in theme files and actions such as publishing.
- 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 |  Diffy Theme Tools |  ThemeWatch |
|---|---|---|
| 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 | Diffy Theme Tools | ThemeWatch |
|---|---|---|
| App Store rating | 4.7 ★ | Not published |
| App Store reviews | 7 | Not published |
| New reviews, 28 days | 0 | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | Diffy Theme Tools | ThemeWatch |
|---|---|---|
| Free plan | Not listed | Not listed |
| Lowest paid monthly plan | $9.99/month | $4.99/month(ahead) |
| Longest free trial | 30 days | 14 days |
| Plans listed | 1 | 1 |
Listing
| Measure | Diffy Theme Tools | ThemeWatch |
|---|---|---|
| Shopify category rank | #70 | #98 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Aug 7, 2020 | Feb 12, 2026 |
| Languages | 19 | 1 |
| Developer | Immersive Ecommerce | KIS Commerce |
FAQ
Diffy Theme Tools and ThemeWatch: common questions
- Is Diffy Theme Tools or ThemeWatch cheaper?
- Paid plans start at $9.99/month for Diffy Theme Tools 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 Oct 13, 2026 for Diffy Theme Tools, 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 Oct 13, 2026 for Diffy Theme Tools, 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.