Comparison · 30 merchant reviews read · Updated October 2026
CustomFit AI vs Theme Scientist
Short answer
Pick CustomFit AI if you need price tests and template tests and you want to start on a free plan.
 CustomFit AI |  Theme Scientist | |
|---|---|---|
| App Store rating | 5★ (20) | 4★ (13) |
| Cost at your traffic | $139+/moYour traffic is above the listed limits. Upto 10000 Monthly is the floor, expect a custom quote. | $29.99+/moYour traffic is above the listed limits. Tester Pro is the floor, expect a custom quote. |
| How price scales | Free on dev stores for a 14-day trial, then $79/month for up to 10,000 monthly visitors, or $139/month for the plan that adds AI Copilot. | 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 | May 16, 2023 | March 5, 2020 |
| App Store listing | App Store listing |
CustomFit AI starts at $0 a month, Theme Scientist at $9.99
CustomFit AI
- Free (Dev stores)Free
- 10000 visitors/mo$79/mo
- Upto 10000 Monthly$139/mo
Theme Scientist
- Tester$9.99/mo
- Tester+$19.99/mo
- Tester Pro$29.99/mo
Only CustomFit AI can run price tests
Read from each app's listing. A dot means the listing says it can do it.
| CustomFit AI | Theme Scientist | |
|---|---|---|
| Price tests | ● | ○ |
| Theme tests | ● | ● |
| Template tests | ● | ○ |
| Content tests | ● | ● |
| URL split tests | ● | ○ |
| Offer tests | ● | ○ |
| Checkout tests | ● | ○ |
| Personalization | ● | ○ |
| Visual editor | ● | ○ |
| AI test ideas | ● | ○ |
| Free plan | ● | ○ |
What reviewers complain about
None of these apps has 20+ reviews yet, so there's not enough to compare complaint rates.
Theme Scientist replies to 85% of reviews. CustomFit AI replies to none
| CustomFit AI | Theme Scientist | |
|---|---|---|
| Reviews with a developer reply | 0% | 85% |
| Praise support | 64.7% | 69.2% |
| Complain about support | 0% | 7.7% |
Results merchants put a number on
- 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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