Apollo.io vs ZoomInfo SalesOS
Eleven of fourteen models named Apollo.io first on the direct prompt; two named ZoomInfo SalesOS. Both were named by all fourteen models and Apollo.io carries 74 labels and ZoomInfo SalesOS 70, so the shares are not directly comparable.
San Francisco, United States, founded 2015. Named in twenty-two categories this edition.
By ZoomInfo, Vancouver, Washington, United States, founded 2000. Named in three categories this edition.
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the sales intelligence and contact data page.
By framing
Apollo.ioFirst choices, of fourteen modelsZoomInfo SalesOS
Across every category in the November 2026 Edition, Apollo.io and ZoomInfo SalesOS were named in the same answer 198 times, of the 1129 answers naming Apollo.io and the 219 naming ZoomInfo SalesOS. In those answers ZoomInfo SalesOS took the first choice forty-seven times and Apollo.io ninety.
Every model, every framing
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | | | | |
| GPT-5.4 mini | | | | | ||
| Gemini 3.5 Flash | | | | | | |
| Perplexity Sonar | | | | | | |
| Grok 4.20 | | | | | | |
| Mistral Small | | | | | | |
| DeepSeek V4 Flash | | | | | | |
| Llama 4 Maverick | | | | |||
| Qwen 3.7 Flash | | | | | | |
| Kimi K2 | | | | | | |
| GLM 4.7 FlashX | | | | | | |
| MiniMax M2.5 | | | | | | |
| GPT-6 Luna | | | | | | |
| Muse Glimmer 30B | | | | | |
Apollo.io ZoomInfo SalesOS first choice named as an alternative argued againstblank: not namedEach cell is one answer, Apollo.io on the left and ZoomInfo SalesOS on the right.The direct prompt
Apollo.io first, ZoomInfo SalesOS an alternative
11 of 14 modelsZoomInfo SalesOS was named in the answer but not as the choice, or not at all.ZoomInfo SalesOS first, Apollo.io an alternative
2 of 14 modelsApollo.io was named in the answer but not as the choice, or not at all.Neither was the first choice, one was named
1 of 14 modelsThe answer put something else first and named one of the two as an alternative.Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.
By buyer segment
Apollo.io96%#1 of 8ZoomInfo SalesOS0%#8 of 8Apollo.io93%#1 of 13ZoomInfo SalesOS5%#2 of 13ZoomInfo SalesOS73%#1 of 12Apollo.io9%#2 of 12What the models said about Apollo.io
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. One of one in this category shown.
“Apollo's data quality issues are well-documented, with users reporting accuracy has declined, particularly for phone numbers.” Claude Haiku 4.5 · negative prompt · hard negative
What the models said about ZoomInfo SalesOS
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“Avoid ZoomInfo initially unless the company needs enterprise-grade coverage and can justify a substantially higher, quote-based cost.” Perplexity Sonar · budget prompt · hard negative
“ZoomInfo is subject to numerous complaints and multiple lawsuits concerning its collection and sales of personal data” Claude Haiku 4.5 · negative prompt · hard negative
“What to Avoid (The "Expensive" Options) * ZoomInfo: Starts at ~$15,000/year... not suitable for limited budgets.” GLM 4.7 FlashX · budget prompt · hard negative
“Highest data accuracy in US enterprise markets... typically LinkedIn Sales Navigator for networking plus one contact database (Apollo or ZoomInfo) for enrichment” GLM 4.7 FlashX · comparative prompt · first choice
“Best for detailed B2B data, including firmographics, technographics, and intent data. It's a leader in comprehensive contact and company databases” Mistral Small · comparative prompt · first choice
“Enterprise standard for B2B sales intelligence. 420 million+ contact profiles... Largest B2B contact database, enterprise-grade.” Muse Glimmer 30B · comparative prompt · first choice
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.