# GrowthBook, Optimizely Feature Experimentation vs AB Tasty Comparison | | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Star Rating** | 4.6 out of 5 | 4.3 out of 5 | 4.4 out of 5 | | **Total Reviews** | 26 | 117 | 409 | | **Largest Market Segment** | Small-Business (53.8% of reviews) | Mid-Market (50.4% of reviews) | Mid-Market (50.9% of reviews) | | **Entry Level Price** | Free 3 seats | No pricing available | Contact Us for Pricing | --- ## Top Pros & Cons ### GrowthBook Pros: - Data Analysis (2 reviews) - A/B Testing (1 reviews) Cons: - Feature Flags Issues (1 reviews) - Learning Curve (1 reviews) ### Optimizely Feature Experimentation Pros: - Ease of Use (17 reviews) - Experimentation (17 reviews) Cons: - Difficulty of Use (6 reviews) - Expensive (6 reviews) ### AB Tasty Pros: - Ease of Use (72 reviews) - Customer Support (57 reviews) Cons: - Limitations (22 reviews) - Testing Difficulties (21 reviews) --- ## Ratings Comparison | Rating | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Meets Requirements** | 8.7 (22 reviews) | 8.1 (79 reviews) | 8.5 (377 reviews) | | **Ease of Use** | 8.1 (24 reviews) | 8.1 (86 reviews) | 8.4 (378 reviews) | | **Ease of Setup** | 7.4 (16 reviews) | 7.0 (40 reviews) | 8.3 (249 reviews) | | **Ease of Admin** | 8.5 (8 reviews) | 7.9 (26 reviews) | 8.9 (150 reviews) | | **Quality of Support** | 8.6 (22 reviews) | 8.1 (67 reviews) | 9.3 (373 reviews) | | **Has the product been a good partner in doing business?** | 8.6 (7 reviews) | 8.7 (26 reviews) | 9.1 (152 reviews) | | **Product Direction (% positive)** | 10.0 (21 reviews) | 7.9 (71 reviews) | 9.1 (374 reviews) | --- ## Pricing ### GrowthBook #### Entry-Level Pricing Plan: GrowthBook Cloud Starter Price: Free 3 seats Description: A free version of GrowthBook cloud for up to 3 users. Key Features: - Cloud hosted on our servers - Up to 3 GrowthBook users - Unlimited traffic [Browse all 3 editions](https://www.g2.com/products/growthbook/pricing) #### Free Trial Yes ### Optimizely Feature Experimentation #### Entry-Level Pricing No pricing available #### Free Trial Yes ### AB Tasty #### Entry-Level Pricing Plan: Essentials Price: Contact Us for Pricing Description: Experiment & Personalize, Easy-to-Use, Advanced Targeting & Modifications Key Features: - A/B, split & funnel testing - Personalization campaigns - Visual and code editor, preview for QA [Browse all 2 editions](https://www.g2.com/products/ab-tasty/pricing) #### Free Trial No --- ## Features Comparison By Category ### E-Commerce Personalization | Product | Score | Reviews | |---|---|---| | **GrowthBook** | N/A | N/A | | **Optimizely Feature Experimentation** | N/A | N/A | | **AB Tasty** | 7.4/10 | 185 | #### Visitor Behavior | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Monitoring** | Not enough data | Not enough data | 7.7 (162 reviews) ✓ Verified | | **Targeting** | Not enough data | Not enough data | 8.1 (173 reviews) ✓ Verified | | **Guided Selling** | Not enough data | Not enough data | 7.0 (146 reviews) ✓ Verified | #### Templates | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Library** | Not enough data | Not enough data | 7.5 (150 reviews) ✓ Verified | | **Customization** | Not enough data | Not enough data | 8.0 (168 reviews) ✓ Verified | | **Optimization** | Not enough data | Not enough data | 8.2 (167 reviews) ✓ Verified | #### Personalization | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Recommendation** | Not enough data | Not enough data | 7.2 (144 reviews) ✓ Verified | | **Content** | Not enough data | Not enough data | 7.8 (148 reviews) ✓ Verified | | **Cart Abandonment** | Not enough data | Not enough data | 7.2 (124 reviews) ✓ Verified | | **Search** | Not enough data | Not enough data | Feature Not Available | | **Personalization Engine** | Not enough data | Not enough data | 7.2 (120 reviews) ✓ Verified | | **Product Recommendations** | Not enough data | Not enough data | 6.8 (116 reviews) ✓ Verified | | **A/B Testing** | Not enough data | Not enough data | 9.1 (165 reviews) ✓ Verified | | **Personalized Messaging** | Not enough data | Not enough data | 8.0 (133 reviews) ✓ Verified | #### Multichannel | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Web** | Not enough data | Not enough data | 8.2 (149 reviews) ✓ Verified | | **Email** | Not enough data | Not enough data | 5.5 (96 reviews) | | **Mobile** | Not enough data | Not enough data | 7.9 (137 reviews) ✓ Verified | #### Administration | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Marketing Campaigns** | Not enough data | Not enough data | 7.2 (121 reviews) ✓ Verified | | **Reports & Analytics** | Not enough data | Not enough data | 7.7 (142 reviews) ✓ Verified | | **User Data** | Not enough data | Not enough data | 7.5 (126 reviews) ✓ Verified | | **Integrations** | Not enough data | Not enough data | 7.5 (132 reviews) ✓ Verified | #### Agentic AI - E-Commerce Personalization | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Natural Language Interaction** | Not enough data | Not enough data | 6.2 (50 reviews) | | **Proactive Assistance** | Not enough data | Not enough data | 6.2 (49 reviews) | ### Personalization Engines | Product | Score | Reviews | |---|---|---| | **GrowthBook** | N/A | N/A | | **Optimizely Feature Experimentation** | N/A | N/A | | **AB Tasty** | 8.6/10 | 8 | #### Segmentation | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **A/B Testing** | Not enough data | Not enough data | 8.8 (7 reviews) | | **Customer Profiles** | Not enough data | Not enough data | 7.3 (5 reviews) | #### Targeting | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Behavioral Targeting** | Not enough data | Not enough data | 8.9 (6 reviews) | | **Contextual Targeting** | Not enough data | Not enough data | 8.9 (6 reviews) | #### Triggered Content | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Geofencing** | Not enough data | Not enough data | 9.0 (5 reviews) | | **Triggered Emails** | Not enough data | Not enough data | Feature Not Available | | **Triggered Messages** | Not enough data | Not enough data | 8.0 (5 reviews) | #### Personalized Content | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Recommendation Engine** | Not enough data | Not enough data | Not enough data | | **Personalized Discounts** | Not enough data | Not enough data | Not enough data | | **Website Personalization** | Not enough data | Not enough data | 9.2 (6 reviews) | #### Agentic AI - Personalization Engines | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Autonomous Task Execution** | Not enough data | Not enough data | Not enough data | | **Cross-system Integration** | Not enough data | Not enough data | Not enough data | | **Adaptive Learning** | Not enough data | Not enough data | Not enough data | | **Natural Language Interaction** | Not enough data | Not enough data | Not enough data | | **Proactive Assistance** | Not enough data | Not enough data | Not enough data | | **Decision Making** | Not enough data | Not enough data | Not enough data | ### Feature Management | Product | Score | Reviews | |---|---|---| | **GrowthBook** | 8.7/10 | 12 | | **Optimizely Feature Experimentation** | 8.3/10 | 38 | | **AB Tasty** | 7.9/10 | 39 | #### Management | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Flag Management** | 9.2 (12 reviews) | 8.6 (37 reviews) | 8.1 (31 reviews) | | **Rollout & Rollback Control** | 8.9 (12 reviews) | 8.5 (37 reviews) | 7.7 (24 reviews) | | **Monitoring** | 8.2 (11 reviews) | 7.6 (36 reviews) | 7.6 (30 reviews) | #### Functionality | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Multi-Environment Control** | 8.5 (11 reviews) | 8.6 (37 reviews) | 7.5 (27 reviews) | | **Feature Testing** | 9.2 (11 reviews) | 8.8 (38 reviews) | 8.3 (32 reviews) | | **Low-Code Interface** | 7.9 (11 reviews) | 7.6 (37 reviews) | 8.0 (28 reviews) | ### A/B Testing | Product | Score | Reviews | |---|---|---| | **GrowthBook** | 7.6/10 | 18 | | **Optimizely Feature Experimentation** | 7.4/10 | 30 | | **AB Tasty** | 7.0/10 | 267 | #### Computing | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **WYSIWYG** | 7.4 (16 reviews) | Feature Not Available | 7.7 (235 reviews) | | **AI/Machine Learning** | 6.3 (15 reviews) | 6.5 (27 reviews) | 6.4 (182 reviews) | | **Little to No Coding** | 6.8 (15 reviews) | 7.6 (29 reviews) | 7.3 (230 reviews) | #### Experimental Design | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Multivariate testing capacities** | 9.0 (18 reviews) | 7.7 (30 reviews) | 8.2 (235 reviews) | | **Concurrent Testing** | 9.1 (17 reviews) | 7.7 (29 reviews) | 8.2 (217 reviews) | | **Mobile Testing** | 8.2 (17 reviews) | 8.0 (29 reviews) | 8.3 (235 reviews) | #### Analytics | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Reporting and Analytics** | 8.9 (16 reviews) | 7.1 (29 reviews) | 7.8 (249 reviews) | | **Heatmaps** | 5.1 (14 reviews) | Feature Not Available | 5.5 (190 reviews) | #### Agentic AI - A/B Testing | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Autonomous Task Execution** | Not enough data | Not enough data | 5.9 (85 reviews) | | **Cross-system Integration** | Not enough data | Not enough data | 6.2 (81 reviews) | | **Adaptive Learning** | Not enough data | Not enough data | 6.0 (82 reviews) | | **Proactive Assistance** | Not enough data | Not enough data | 6.2 (81 reviews) | ### Emotion AI | Product | Score | Reviews | |---|---|---| | **GrowthBook** | N/A | N/A | | **Optimizely Feature Experimentation** | N/A | N/A | | **AB Tasty** | 7.7/10 | 6 | #### Usability - Emotion AI | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Multi-Modal Support** | Not enough data | Not enough data | Not enough data | | **Setup Simplicity** | Not enough data | Not enough data | Not enough data | | **Platform Integration** | Not enough data | Not enough data | 7.7 (5 reviews) | | **User Interface Design** | Not enough data | Not enough data | Not enough data | #### Performance Optimization - Emotion AI | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Data Privacy** | Not enough data | Not enough data | Not enough data | | **Scalability** | Not enough data | Not enough data | Not enough data | | **Real-Time Processing** | Not enough data | Not enough data | Not enough data | #### Security & Compliance - Emotion AI | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Emotion Granularity** | Not enough data | Not enough data | Not enough data | | **Ethical AI Compliance** | Not enough data | Not enough data | Not enough data | | **Encryption Support** | Not enough data | Not enough data | Not enough data | #### Advanced Features - Emotion AI | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Integration APIs** | Not enough data | Not enough data | Not enough data | | **Adaptive Emotion Responses** | Not enough data | Not enough data | Not enough data | | **Multi-Language Support** | Not enough data | Not enough data | Not enough data | #### Detection Features - Emotion AI | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Voice Emotion Analysis** | Not enough data | Not enough data | Not enough data | | **Facial Expression Recognition** | Not enough data | Not enough data | Not enough data | | **Emotion Detection in Low-Quality Inputs** | Not enough data | Not enough data | Not enough data | #### Agentic AI - Emotion AI | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Adaptive Learning** | Not enough data | Not enough data | Not enough data | | **Natural Language Interaction** | Not enough data | Not enough data | Not enough data | ### Personalization | Product | Score | Reviews | |---|---|---| | **GrowthBook** | N/A | N/A | | **Optimizely Feature Experimentation** | N/A | N/A | | **AB Tasty** | 6.2/10 | 34 | #### Agentic AI - Personalization | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Autonomous Task Execution** | Not enough data | Not enough data | 6.1 (33 reviews) | | **Cross-system Integration** | Not enough data | Not enough data | 6.0 (32 reviews) | | **Adaptive Learning** | Not enough data | Not enough data | 6.0 (32 reviews) | | **Natural Language Interaction** | Not enough data | Not enough data | 6.4 (32 reviews) | | **Proactive Assistance** | Not enough data | Not enough data | 5.9 (31 reviews) | | **Decision Making** | Not enough data | Not enough data | 6.6 (33 reviews) | ### Mobile App Optimization | Product | Score | Reviews | |---|---|---| | **GrowthBook** | N/A | N/A | | **Optimizely Feature Experimentation** | N/A | N/A | | **AB Tasty** | 8.4/10 | 27 | #### Variation Testing | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **A/B Testing** | Not enough data | Not enough data | 9.1 (24 reviews) | | **WYSIWYG Editor** | Not enough data | Not enough data | 7.4 (22 reviews) | | **Conversion Goal** | Not enough data | Not enough data | 8.5 (24 reviews) | | **Percentage of Traffic** | Not enough data | Not enough data | 9.0 (23 reviews) | | **Confidence Level** | Not enough data | Not enough data | 8.3 (23 reviews) | | **Multivariant Testing** | Not enough data | Not enough data | 8.2 (20 reviews) | #### Reporting | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Segmentation** | Not enough data | Not enough data | 8.3 (24 reviews) | | **Reports and Dashboards** | Not enough data | Not enough data | 8.2 (24 reviews) | #### Personalization | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Standard Targeting** | Not enough data | Not enough data | 8.9 (20 reviews) | | **Custom Targeting** | Not enough data | Not enough data | 8.5 (20 reviews) | | **Data Segmentation** | Not enough data | Not enough data | 8.1 (20 reviews) | #### Administration | Feature | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **API / Integrations** | Not enough data | Not enough data | 8.2 (19 reviews) | | **QA Testing** | Not enough data | Not enough data | 8.2 (22 reviews) | | **Performance and Reliability** | Not enough data | Not enough data | 8.5 (22 reviews) | | **User, Role, and Access Management** | Not enough data | Not enough data | 8.8 (22 reviews) | --- ## Categories **Shared Categories (2):** [A/B Testing Tools](https://www.g2.com/categories/a-b-testing-tools), [Feature Management Software](https://www.g2.com/categories/feature-management) **Unique to Optimizely Feature Experimentation (1):** [Personalization Software](https://www.g2.com/categories/personalization) **Unique to AB Tasty (5):** [Personalization Software](https://www.g2.com/categories/personalization), [Personalization Engines](https://www.g2.com/categories/personalization-engines), [E-Commerce Personalization Software](https://www.g2.com/categories/e-commerce-personalization), [Mobile App Optimization Software](https://www.g2.com/categories/mobile-app-optimization), [Emotion AI Software](https://www.g2.com/categories/emotion-ai) --- ## Reviewer Demographics ### By Company Size | Segment | GrowthBook | Optimizely Feature Experimentation | AB Tasty | |---|---|---|---| | **Small-Business** | 53.8% | 26.5% | 17.0% | | **Mid-Market** | 46.2% | 50.4% | 50.9% | | **Enterprise** | 0% | 23.1% | 32.2% | ### By Industry #### GrowthBook - **Computer Software:** 20.0% - **Leisure, Travel & Tourism:** 12.0% - **Information Technology and Services:** 12.0% - **Alternative Dispute Resolution:** 4.0% - **Automotive:** 4.0% - **Computer Games:** 4.0% - **Construction:** 4.0% - **Events Services:** 4.0% - **Furniture:** 4.0% - **Higher Education:** 4.0% - **Other:** 28.0% #### Optimizely Feature Experimentation - **Financial Services:** 17.1% - **Computer Software:** 10.3% - **Retail:** 6.0% - **Information Technology and Services:** 6.0% - **Real Estate:** 5.1% - **Insurance:** 5.1% - **Automotive:** 4.3% - **Internet:** 4.3% - **Entertainment:** 3.4% - **Education Management:** 2.6% - **Other:** 35.9% #### AB Tasty - **Retail:** 14.5% - **Cosmetics:** 7.5% - **Leisure, Travel & Tourism:** 5.7% - **Apparel & Fashion:** 4.5% - **Consumer Goods:** 4.2% - **Marketing and Advertising:** 3.5% - **Insurance:** 3.5% - **Food & Beverages:** 3.0% - **Financial Services:** 3.0% - **Luxury Goods & Jewelry:** 2.7% - **Other:** 47.9% --- ## Alternatives ### Alternatives to GrowthBook - [PostHog](https://www.g2.com/products/posthog/reviews) — 4.5/5 stars (1050 reviews) - [VWO Testing](https://www.g2.com/products/wingify-vwo-testing/reviews) — 4.4/5 stars (928 reviews) - [Statsig](https://www.g2.com/products/statsig/reviews) — 4.7/5 stars (347 reviews) - [Unleash](https://www.g2.com/products/unleash/reviews) — 4.7/5 stars (123 reviews) - [Optimizely Web Experimentation](https://www.g2.com/products/optimizely-web-experimentation/reviews) — 4.2/5 stars (411 reviews) - [LaunchDarkly](https://www.g2.com/products/launchdarkly/reviews) — 4.5/5 stars (734 reviews) - [ClickFunnels](https://www.g2.com/products/clickfunnels/reviews) — 4.6/5 stars (417 reviews) - [CloudBees](https://www.g2.com/products/cloudbees/reviews) — 4.4/5 stars (621 reviews) - [Bloomreach](https://www.g2.com/products/bloomreach-bloomreach/reviews) — 4.6/5 stars (764 reviews) - [MoEngage](https://www.g2.com/products/moengage/reviews) — 4.5/5 stars (524 reviews) ### Alternatives to Optimizely Feature Experimentation - [Statsig](https://www.g2.com/products/statsig/reviews) — 4.7/5 stars (347 reviews) - [LaunchDarkly](https://www.g2.com/products/launchdarkly/reviews) — 4.5/5 stars (734 reviews) - [VWO Testing](https://www.g2.com/products/wingify-vwo-testing/reviews) — 4.4/5 stars (928 reviews) - [PostHog](https://www.g2.com/products/posthog/reviews) — 4.5/5 stars (1050 reviews) - [Insider One](https://www.g2.com/products/insider-one/reviews) — 4.8/5 stars (1357 reviews) - [Algolia](https://www.g2.com/products/algolia/reviews) — 4.5/5 stars (451 reviews) - [Unbounce Landing Pages](https://www.g2.com/products/unbounce-unbounce-landing-pages/reviews) — 4.3/5 stars (386 reviews) - [Bloomreach](https://www.g2.com/products/bloomreach-bloomreach/reviews) — 4.6/5 stars (764 reviews) - [MoEngage](https://www.g2.com/products/moengage/reviews) — 4.5/5 stars (524 reviews) - [ClickFunnels](https://www.g2.com/products/clickfunnels/reviews) — 4.6/5 stars (417 reviews) ### Alternatives to AB Tasty - [VWO Testing](https://www.g2.com/products/wingify-vwo-testing/reviews) — 4.4/5 stars (928 reviews) - [Optimizely Web Experimentation](https://www.g2.com/products/optimizely-web-experimentation/reviews) — 4.2/5 stars (411 reviews) - [Kameleoon](https://www.g2.com/products/kameleoon/reviews) — 4.6/5 stars (137 reviews) - [Insider One](https://www.g2.com/products/insider-one/reviews) — 4.8/5 stars (1357 reviews) - [Webtrends Optimize](https://www.g2.com/products/webtrends-optimize/reviews) — 4.8/5 stars (217 reviews) - [Dynamic Yield](https://www.g2.com/products/dynamic-yield/reviews) — 4.5/5 stars (157 reviews) - [Adobe Target](https://www.g2.com/products/adobe-adobe-target/reviews) — 4.0/5 stars (70 reviews) - [LaunchDarkly](https://www.g2.com/products/launchdarkly/reviews) — 4.5/5 stars (734 reviews) - [Bloomreach](https://www.g2.com/products/bloomreach-bloomreach/reviews) — 4.6/5 stars (764 reviews) - [Monetate](https://www.g2.com/products/monetate/reviews) — 4.1/5 stars (130 reviews) --- ## Top Discussions ### GrowthBook No discussions available for this product. ### Optimizely Feature Experimentation - Title: [Is optimizely open source?](https://www.g2.com/discussions/is-optimizely-open-source) — 1 comment > **Top comment:** "No. It is not." ### AB Tasty - Title: [What are some examples of how you have used the personalization features?](https://www.g2.com/discussions/what-are-some-examples-of-how-you-have-used-the-personalization-features) — 1 comment, 1 upvote > **Top comment:** "AB Tasty has many use cases across industries to improve the sales conversion rate." - Title: [Can I carry out tests without the help of my technical teams?](https://www.g2.com/discussions/easy-to-use) — 1 comment, 1 upvote *(includes official response)* > **Top comment:** "Yes, that’s the whole idea behind AB Tasty. You are in the driving seat of your website so you can be independent, modify your pages, and set up your tests..." - Title: [How does AB Tasty use the data it collects?](https://www.g2.com/discussions/ab-tasty-and-data-protection-1bd205bf-e955-41ff-ad84-ab6d379cf476) — 1 comment, 1 upvote *(includes official response)* > **Top comment:** "When a contract is signed between AB Tasty and the customer, it is specified that AB Tasty processes data collected on users, but it is not the owner: we..." - Title: [Is AB Tasty compliant with personal data protection laws?](https://www.g2.com/discussions/ab-tasty-and-data-protection) — 1 comment, 1 upvote *(includes official response)* > **Top comment:** "Since we’re dedicated to respecting international laws and regulations, we make sure that our solution is compliant with all data regulation." - Title: [How do I install AB Tasty on my site?](https://www.g2.com/discussions/setup-and-technical-requirements) — 1 comment, 1 upvote *(includes official response)* > **Top comment:** "Before you can set up a campaign, you need to install the AB Tasty tag on your site. This process only takes a few minutes. " --- **Source:** [G2.com](https://www.g2.com) | [Comparison Page](https://www.g2.com/compare/growthbook-vs-optimizely-feature-experimentation-vs-ab-tasty)