Comparison · 106 merchant reviews read · Updated October 2026
Personizely vs Theme Scientist
Short answer
Pick Personizely if you need price tests and template tests and you want the most proven option (94 reviews).
Pick Theme Scientist if you want the lowest starting price ($9.99/month).
 Personizely |  Theme Scientist | |
|---|---|---|
| App Store rating | 5★ (94) | 4★ (13) |
| Cost at your traffic | $39+/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 $39/month and goes up with site-wide monthly unique visitors, with a free trial available and about 20% off on annual billing. | 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 26, 2018 · Changelog | March 5, 2020 |
| App Store listing | App Store listing |
Theme Scientist starts at $9.99 a month, Personizely at $39
Personizely
- Essential$39/mo
- Premium$59/mo
- Premium Plus$149/mo
“Based on site-wide monthly unique visitors.”
Theme Scientist
- Tester$9.99/mo
- Tester+$19.99/mo
- Tester Pro$29.99/mo
Only Personizely can run price tests
Read from each app's listing. A dot means the listing says it can do it.
| Personizely | Theme Scientist | |
|---|---|---|
| Price tests | ● | ○ |
| Theme tests | ● | ● |
| Template tests | ● | ○ |
| Content tests | ● | ● |
| URL split tests | ● | ○ |
| Shipping tests | ● | ○ |
| Checkout tests | ● | ○ |
| Personalization | ● | ○ |
| Audience targeting | ● | ○ |
What reviewers complain about
Share of each app's reviews that complain about the topic. Apps under 20 reviews are left out because a single review swings the number.
| Personizely | |
|---|---|
| Price | 2.2% |
| Billing and refunds | 0% |
| Support | 1.1% |
| Bugs | 2.2% |
| Setup | 1.1% |
| Dashboard | 0% |
| Reporting and stats | 0% |
| Flicker | 0% |
| Page speed | 0% |
| Integrations | 0% |
| What you can test | 0% |
| Results | 0% |
The most common Personizely complaint: price
App has a glitch which causes the cart no to function properly. Another glitch causes the app to install in backup versions of your theme. This caused a myriad of issues and an expensive process for diagnosing. Support was friendly, but seemed to either not completely understand the issue or lacked understanding on how this affected us with regards to time/money. They offered a discount, but…
Theme Scientist replies to 85% of reviews, Personizely to 29%
| Personizely | Theme Scientist | |
|---|---|---|
| Reviews with a developer reply | 29% | 85% |
| Praise support | 75.3% | 69.2% |
| Complain about support | 1.1% | 7.7% |
Results merchants put a number on
- + de 6K revenue with Personizely. “lever + de 6K”
- 12 other with Personizely. “12 upsells”
- almost doubled AOV with Personizely. “almost doubled my AOV”
- tripled other with Personizely, testing popup opt-in rate. “tripled the opt-in rate”
- more than 5000$ revenue with Personizely. “more than 5000$ in sales”
- 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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