Comparison · 142 merchant reviews read · Updated October 2026
Shoplift vs Theme Scientist
Short answer
Pick Shoplift if you need price tests and template tests and you're replacing Google Optimize (8 reviewers made that move).
Pick Theme Scientist if you want the lowest starting price ($9.99/month).
 Shoplift |  Theme Scientist | |
|---|---|---|
| App Store rating | 4.9★ (133) | 4★ (13) |
| Cost at your traffic | $99+/moStarting price. The listing says price rises with visitors but gives no tiers. | $29.99+/moYour traffic is above the listed limits. Tester Pro is the floor, expect a custom quote. |
| How price scales | Starts at $99/month ($74/month billed annually) and goes up with your site's monthly unique visitors, with higher tiers adding features and support. | Starts at $9.99/month with a 14-day free trial, and the price goes up as your store's monthly order limit increases (50, 250, or 500 orders). |
| Launched | September 15, 2022 | March 5, 2020 |
| App Store listing | App Store listing |
Theme Scientist starts at $9.99 a month, Shoplift at $99
Shoplift
- Core$99/mo
- Advanced$399/mo
- Pro$999/mo
“Based on site-wide monthly unique visitors.”
Theme Scientist
- Tester$9.99/mo
- Tester+$19.99/mo
- Tester Pro$29.99/mo
Only Shoplift can run price tests
Read from each app's listing. A dot means the listing says it can do it.
| Shoplift | Theme Scientist | |
|---|---|---|
| Price tests | ● | ○ |
| Theme tests | ● | ● |
| Template tests | ● | ○ |
| Content tests | ● | ● |
| URL split tests | ● | ○ |
| Visual editor | ● | ○ |
| AI test ideas | ● | ○ |
| Audience targeting | ● | ○ |
| Heatmaps | ● | ○ |
What reviewers complain about
Share of each app's reviews that complain about the topic. Apps under 20 reviews are left out because a single review swings the number.
| Shoplift | |
|---|---|
| Price | 3.9% |
| Billing and refunds | 1.6% |
| Support | 1.6% |
| Bugs | 1.6% |
| Setup | 0.8% |
| Dashboard | 0.8% |
| Reporting and stats | 0% |
| Flicker | 0% |
| Page speed | 0% |
| Integrations | 1.6% |
| What you can test | 2.3% |
| Results | 0.8% |
The most common Shoplift complaint: price
The product itself works as advertised. We like the fact variants load without the original-page flash you get with some client-side testing apps. Two reasons I uninstalled. First, pricing. If you run a high-traffic store, the session-based cost gets very expensive very quickly. In our case several times what comparable tools charge. Check the maths carefully against your own traffic profile…
Theme Scientist replies to 85% of reviews. Shoplift replies to none
| Shoplift | Theme Scientist | |
|---|---|---|
| Reviews with a developer reply | 0% | 85% |
| Praise support | 71.3% | 69.2% |
| Complain about support | 1.6% | 7.7% |
Serious problems reviewers reported
Billing disputes, broken stores, misused data and missing features. Each one is a single merchant's account.
The product itself works as advertised. We like the fact variants load without the original-page flash you get with some client-side testing apps. Two reasons I uninstalled. First, pricing. If you run a high-traffic store, the session-based cost gets very expensive very quickly. In our case several times what comparable tools charge. Check the maths carefully against your own traffic profile…
Didn't had the change to run split-tests because bugs. $99,- gone for not even live with the app. First of all, the app is buggy and not worth the cost. It is connected to an outdated theme, and I didn’t even have a chance to try it properly. I tried to run a split-test but for some reason it grab the outdated theme. There is no live chat. I will try Intelegems.
Results merchants put a number on
- 45% conversion rate with Shoplift. “increase our conversion rate by 45%”
- over $50k a year revenue with Theme Scientist, testing multiple growth ideas. “increase our revenue by over $50k a year”
- double conversion rate with Theme Scientist. “double, yes double our conversion rates in 3 months”
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