# Amplitude vs Fullstory: which do AI models recommend for customer intel, September 2026

GTM AI Recommendation Index, September 2026 Edition, Customer intelligence and data science. Zero of twelve models named Amplitude first on the direct prompt; zero named Fullstory. Page: https://gtm-ai-index.com/gtm-data/customer-intelligence-and-data-science/amplitude-vs-fullstory/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Amplitude | 6% | #3 of 14 | 16% | 38 | 12 of 12 |
| Fullstory | 2% | #7 of 14 | 21% | 14 | 10 of 12 |

## The direct prompt, model by model

- Qwen 3.7 Flash: neither first, one named (first choices: Gong, HubSpot, Mixpanel) (alternatives: Amplitude, Clari Copilot, Gainsight, Hightouch, PostHog, Segment, Totango)
- Kimi K2: neither first, one named (first choices: HubSpot Operations Hub + Breeze AI) (alternatives: 6sense, Amplitude, Avoma, Clari Copilot, Mixpanel)
- Claude Haiku 4.5: neither named (first choices: Gainsight) (alternatives: Crunchbase, Demandbase)
- GPT-5.4 mini: neither named (first choices: Microsoft Dynamics 365 Customer Insights) (alternatives: 6sense, Adobe Real-Time CDP, Salesforce CRM Analytics)
- Gemini 3.5 Flash: neither named (first choices: ChurnZero) (alternatives: 6sense, Hightouch, HockeyStack, HubSpot Breeze Intelligence, Mixpanel, Oliv, PostHog, Vitally)
- Perplexity Sonar: neither named (first choices: Segment) (alternatives: ChurnZero, Contentsquare, Hightouch, Outreach, Tealium)
- Grok 4.1 Fast: neither named (first choices: Segment) (alternatives: Hightouch, ZoomInfo)
- Mistral Small: neither named (first choices: Hightouch, Segment) (alternatives: Planhat, Tealium)
- DeepSeek V4 Flash: neither named (first choices: Vitally) (alternatives: Apollo.io, Planhat, Salesmotion)
- Llama 4 Maverick: neither named
- GLM 4.7 FlashX: neither named (first choices: BuildBetter, Segment) (alternatives: Enterpret, HubSpot Marketing Hub, Salesforce Data Cloud)
- MiniMax M2.5: neither named (first choices: HyperOrbit, Planhat) (alternatives: Chattermill, Thematic, Unwrap)

## What the models said about Amplitude

- "Who should avoid them: Startups without dedicated developers to write tracking code" (Gemini 3.5 Flash, negative prompt, hard negative)
- "I'd usually recommend Amplitude if your main goal is to understand and improve the digital customer journey" (GPT-5.4 mini, paraphrase prompt, first choice)

## What the models said about Fullstory

- "Most heatmap and session recording tools (like Hotjar or FullStory) can get very expensive." (Qwen 3.7 Flash, budget prompt, soft negative)
- "Purely B2C-oriented tools like Heap, FullStory... weaker at account-level B2B analysis" (DeepSeek V4 Flash, paraphrase prompt, soft negative)
- "Fullstory is the top choice for understanding users' behavior across digital platforms" (Claude Haiku 4.5, comparative prompt, first choice)
- "Start with FullStory if you are purely digital/service-focused." (Qwen 3.7 Flash, paraphrase prompt, first choice)
- "Choose Contentsquare or FullStory if you care most about user experience diagnosis and session replay." (GPT-5.4 mini, comparative prompt, alternative)

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all twelve models, for a mid-market B2B company; rank is within the category. Comparisons are drawn for the top eight products in each category. Published under CC BY 4.0; the output is the models' output, and nothing here is a recommendation by the index.