# Who uses Customer.io? 35 companies use Customer.io on usedby: 15 confirmed, 2 declared by the company, 18 observed and 0 signals. Of the 16 with a known size, 50% have up to 200 employees. The largest group: Artificial Intelligence companies with up to 200 employees (6 companies). Customers include Buffer, Cosentino's Food Group and Georgia Aquarium. Latest check 2026-11-12: 35 of 35 companies checked, from 20 public sources. - Category: [Personalization & advertising](https://www.usedby.ai/tools/category/marketing-personalization-ads.md) - Website: [customer.io](https://customer.io/) ## Customers Every line is a customer, at one of three proof levels: confirmed (a case study, a named quote, a press release, or the company's own public account of using the tool (its own site, or a post by one of its executives, VP or above)), observed (the vendor shows the company on its own pages) or signal (a job post shows the company's employees use the tool, the weakest proof). A line the company declared to usedby itself, or that it lists as a sub-processor on its own legal page, is marked declared. The first public proof is a relationship-level date, not an adoption date. Relationship labels describe the source's scope. They do not establish current contract, spend or company-wide deployment. The claim permalink identifies the usedby record; the primary source supports the relationship. These two links provide attribution for a summary. Evidence is selected, not exhaustive; missing evidence or a public archive does not establish that none exists. Relationship-level dates are not verified publication dates of the selected source. | Company | Industry | Proof | First public proof | Source | Relationship | Claim | |---|---|---|---|---|---|---| | [Buffer](https://www.usedby.ai/companies/buffer.md) | Marketing Tech | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/buffer), captured 2026-11-12 | Usage described by a public source | [Buffer · Customer.io claim](https://www.usedby.ai/claims/cmwdwzksm010owt4enqhym26q) | | [Cosentino's Food Group](https://www.usedby.ai/companies/cosentino-s-food-group.md) | — | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/cosentinos-goodlight-ai), captured 2026-11-12 | Usage described by a public source | [Cosentino's Food Group · Customer.io claim](https://www.usedby.ai/claims/cmwdx9ku8014kwt4e1f0lhv71) | | [Georgia Aquarium](https://www.usedby.ai/companies/georgia-aquarium.md) | — | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/georgia-aquarium-case-study), captured 2026-11-12 | Usage described by a public source | [Georgia Aquarium · Customer.io claim](https://www.usedby.ai/claims/cmwdx1cgt013cwt4e1knr4qc5) | | [GuestReady](https://www.usedby.ai/companies/guestready.md) | Travel & Hospitality | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/guestready-lifecycle-program), captured 2026-11-12 | Usage described by a public source | [GuestReady · Customer.io claim](https://www.usedby.ai/claims/cmwdx1aik0138wt4eiu6wv9qo) | | [Kinnect.Club](https://www.usedby.ai/companies/kinnect-club.md) | — | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/kinnect), captured 2026-11-12 | Usage described by a public source | [Kinnect.Club · Customer.io claim](https://www.usedby.ai/claims/cmwdxbyim015twt4e8rigtwgs) | | [Klar](https://www.usedby.ai/companies/klar.md) | — | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/klar), captured 2026-11-12 | Usage described by a public source | [Klar · Customer.io claim](https://www.usedby.ai/claims/cmwdwzy5s0113wt4eumrkdnvo) | | [Livestorm](https://www.usedby.ai/companies/livestorm.md) | — | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/livestorm), captured 2026-11-12 | Usage described by a public source | [Livestorm · Customer.io claim](https://www.usedby.ai/claims/cmwdwzvyn010zwt4ek5tz06uh) | | [Monarch](https://www.usedby.ai/companies/monarch-monarchmoney-com.md) | — | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/monarch-money), captured 2026-11-12 | Usage described by a public source | [Monarch · Customer.io claim](https://www.usedby.ai/claims/cmwdwzq1b010swt4efuo1tygt) | | [Nordnet](https://www.usedby.ai/companies/nordnet.md) | — | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/nordnet), captured 2026-11-12 | Usage described by a public source | [Nordnet · Customer.io claim](https://www.usedby.ai/claims/cmwdx1f1d013hwt4ex6shnt2e) | | [Notion](https://www.usedby.ai/companies/notion-notion-so.md) | Workplace Software | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/notion), captured 2026-11-12 | Usage described by a public source | [Notion · Customer.io claim](https://www.usedby.ai/claims/cmwdwzqkk010vwt4etokir125) | | [One Horizon](https://www.usedby.ai/companies/one-horizon.md) | — | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/one-horizon), captured 2026-11-12 | Usage described by a public source | [One Horizon · Customer.io claim](https://www.usedby.ai/claims/cmwdxbfab015hwt4e9tu7pl8w) | | [Showrilly](https://www.usedby.ai/companies/showrilly.md) | — | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/showrilly), captured 2026-11-12 | Usage described by a public source | [Showrilly · Customer.io claim](https://www.usedby.ai/claims/cmwdx13lk012twt4en27qgjmn) | | [Takenos](https://www.usedby.ai/companies/takenos.md) | — | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/takenos), captured 2026-11-12 | Usage described by a public source | [Takenos · Customer.io claim](https://www.usedby.ai/claims/cmwdx15yi012xwt4ezeyoo5ak) | | [Tigres UANL](https://www.usedby.ai/companies/tigres-uanl.md) | Sports & Fitness | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/tigres-raidar-fan-engagement), captured 2026-11-12 | Usage described by a public source | [Tigres UANL · Customer.io claim](https://www.usedby.ai/claims/cmwdxaw7i0151wt4e8qlj8q5a) | | [Vibe](https://www.usedby.ai/companies/vibe.md) | Advertising & AdTech | Confirmed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies/vibeco-email-marketing-program), captured 2026-11-12 | Usage described by a public source | [Vibe · Customer.io claim](https://www.usedby.ai/claims/cmwdx0485011lwt4ev7fjmzpl) | | [Capacity](https://www.usedby.ai/companies/capacity.md) | Artificial Intelligence | Declared by the company · checked 2026-11 | On or before November 2026 | Listed as a sub-processor by the company: [trust.capacity.com](https://trust.capacity.com/subprocessors), captured 2026-11-12 | Listed as a sub-processor by the company | [Capacity · Customer.io claim](https://www.usedby.ai/claims/sp_usage_capacity_customer-io_20261112_mwd8u45p) | | [Read AI](https://www.usedby.ai/companies/read-ai.md) | Artificial Intelligence | Declared by the company · checked 2026-11 | On or before November 2026 | Listed as a sub-processor by the company: [trust.read.ai](https://trust.read.ai/subprocessors), captured 2026-11-12 | Listed as a sub-processor by the company | [Read AI · Customer.io claim](https://www.usedby.ai/claims/sp_usage_read-ai_customer-io_20261112_mwd8tzuh) | | [Mixpanel](https://www.usedby.ai/companies/mixpanel.md) | Data & Analytics | Observed · checked 2026-11 | — | [customer.io](https://customer.io/), captured 2026-11-12 | Listed as a customer by the vendor | [Mixpanel · Customer.io claim](https://www.usedby.ai/claims/cmwdx04re011owt4ei2nysn6n) | | [Segment](https://www.usedby.ai/companies/segment.md) | Data & Analytics | Observed · checked 2026-11 | — | [customer.io](https://customer.io/pricing), captured 2026-11-12 | Listed as a customer by the vendor | [Segment · Customer.io claim](https://www.usedby.ai/claims/cmwdx0i9k0125wt4ea238jmb7) | | [Affirm](https://www.usedby.ai/companies/affirm.md) | Fintech & Payments | Observed · checked 2026-11 | — | [customer.io](https://customer.io/), captured 2026-11-12 | Listed as a customer by the vendor | [Affirm · Customer.io claim](https://www.usedby.ai/claims/cmwdx019c011cwt4e786tl9vu) | | [Angi](https://www.usedby.ai/companies/angi.md) | Marketplace | Observed · checked 2026-11 | — | [customer.io](https://customer.io/pricing), captured 2026-11-12 | Listed as a customer by the vendor | [Angi · Customer.io claim](https://www.usedby.ai/claims/cmwdx009f0119wt4ev4cqtzjq) | | [Clearbit](https://www.usedby.ai/companies/clearbit.md) | Sales Tech & CRM | Observed · checked 2026-11 | — | [customer.io](https://customer.io/pricing), captured 2026-11-12 | Listed as a customer by the vendor | [Clearbit · Customer.io claim](https://www.usedby.ai/claims/cmwdx0oob012lwt4ex4hjhk9w) | | [Cleo](https://www.usedby.ai/companies/cleo.md) | Fintech & Payments | Observed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies), captured 2026-11-12 | Listed as a customer by the vendor | [Cleo · Customer.io claim](https://www.usedby.ai/claims/cmwdx18na0134wt4eb7x25mru) | | [Cursor](https://www.usedby.ai/companies/cursor.md) | DevTools & Infrastructure | Observed · checked 2026-11 | — | [customer.io](https://customer.io/), captured 2026-11-12 | Listed as a customer by the vendor | [Cursor · Customer.io claim](https://www.usedby.ai/claims/cmwdx01sk011fwt4e4w4te1k9) | | [Gamma](https://www.usedby.ai/companies/gamma.md) | Artificial Intelligence | Observed · checked 2026-11 | — | [customer.io](https://customer.io/), captured 2026-11-12 | Listed as a customer by the vendor | [Gamma · Customer.io claim](https://www.usedby.ai/claims/cmwdx06gi011uwt4e1p6ykn9b) | | [Higgsfield](https://www.usedby.ai/companies/higgsfield.md) | Artificial Intelligence | Observed · checked 2026-11 | — | [customer.io](https://customer.io/), captured 2026-11-12 | Listed as a customer by the vendor | [Higgsfield · Customer.io claim](https://www.usedby.ai/claims/cmwdx02q3011iwt4e76f2mp2g) | | [IFTTT](https://www.usedby.ai/companies/ifttt.md) | — | Observed · checked 2026-11 | — | [customer.io](https://customer.io/pricing), captured 2026-11-12 | Listed as a customer by the vendor | [IFTTT · Customer.io claim](https://www.usedby.ai/claims/cmwdx0qdp012pwt4e07pzvik9) | | [Impremis Marketing](https://www.usedby.ai/companies/impremis-marketing.md) | — | Observed · checked 2026-11 | — | [customer.io](https://customer.io/learn/case-studies), captured 2026-11-12 | Listed as a customer by the vendor | [Impremis Marketing · Customer.io claim](https://www.usedby.ai/claims/cmwdx17tx0131wt4e75nln4mk) | | [Lemonade](https://www.usedby.ai/companies/lemonade.md) | Insurance & InsurTech | Observed · checked 2026-11 | — | [customer.io](https://customer.io/pricing), captured 2026-11-12 | Listed as a customer by the vendor | [Lemonade · Customer.io claim](https://www.usedby.ai/claims/cmwdx0mlw012ewt4ef7fkv30i) | | [Mailgun](https://www.usedby.ai/companies/mailgun.md) | DevTools & Infrastructure | Observed · checked 2026-11 | — | [customer.io](https://customer.io/pricing), captured 2026-11-12 | Listed as a customer by the vendor | [Mailgun · Customer.io claim](https://www.usedby.ai/claims/cmwdx0num012iwt4einc396qi) | | [Mapbox](https://www.usedby.ai/companies/mapbox.md) | DevTools & Infrastructure | Observed · checked 2026-11 | — | [customer.io](https://customer.io/pricing), captured 2026-11-12 | Listed as a customer by the vendor | [Mapbox · Customer.io claim](https://www.usedby.ai/claims/cmwdx0hcr0121wt4e6mdsjado) | | [Midi](https://www.usedby.ai/companies/midi.md) | HealthTech & Digital Health | Observed · checked 2026-11 | — | [customer.io](https://customer.io/), captured 2026-11-12 | Listed as a customer by the vendor | [Midi · Customer.io claim](https://www.usedby.ai/claims/cmwdx05kc011rwt4e60zcmagh) | | [OpenRouter](https://www.usedby.ai/companies/openrouter.md) | Artificial Intelligence | Observed · checked 2026-11 | — | [customer.io](https://customer.io/), captured 2026-11-12 | Listed as a customer by the vendor | [OpenRouter · Customer.io claim](https://www.usedby.ai/claims/cmwdx07c8011xwt4ey61ke4xr) | | [QuillBot](https://www.usedby.ai/companies/quillbot.md) | — | Observed · checked 2026-11 | — | [customer.io](https://customer.io/pricing), captured 2026-11-12 | Listed as a customer by the vendor | [QuillBot · Customer.io claim](https://www.usedby.ai/claims/cmwdx0lbg012awt4egqzvto6o) | | [Lovable](https://www.usedby.ai/companies/lovable.md) | Artificial Intelligence | Observed · checked 2026-11 | — | [customer.io](https://customer.io/), captured 2026-11-12 | Listed as a customer by the vendor | [Lovable · Customer.io claim](https://www.usedby.ai/claims/cmwdwzzev0116wt4e0ap2lr7k) | ## By industry and company size Customers per industry, split by employees per company. Every proof level counts, job posts included. A company with no stored size gets its own column, never counted as small. | Industry | Customers | Up to 200 | 201 to 1,000 | Over 1,000 | Size unknown | |---|---|---|---|---|---| | Artificial Intelligence | 6 | 6 | 0 | 0 | 0 | | DevTools & Infrastructure | 3 | 0 | 1 | 0 | 2 | ## Personalization & advertising tools by industry Which Personalization & advertising tools companies use in the industries where Customer.io has customers, ranked by companies. - [Personalization & advertising in Travel & Hospitality](https://www.usedby.ai/companies/industry/travel-hospitality/marketing-personalization-ads.md) (1 Customer.io customer in this industry) ## Published results Reviewed stories only. A figure is the vendor’s or the customer’s claim, quoted with its label; usedby did not measure it. - [Kinnect.Club](https://www.usedby.ai/case-studies/kinnect-club-customer-io.md): **80%** Nudge onboarding survey completion and enrollment (Vendor case study, published 2025-12-02) - [Nordnet](https://www.usedby.ai/case-studies/nordnet-customer-io.md): **50 to 60 percent** Open rates on broad campaigns (Vendor case study, published 2025-12-19) - [Vibe](https://www.usedby.ai/case-studies/vibe-co-customer-io.md): **19-25%** Activation rate after onboarding journey launch (Vendor case study, published 2026-04-01) - [Georgia Aquarium](https://www.usedby.ai/case-studies/georgia-aquarium-customer-io.md): **2,000%** Increase in monthly send volume (more than) (Vendor case study, published 2026-04-23) - [Tigres UANL](https://www.usedby.ai/case-studies/tigres-uanl-customer-io.md): **750,000** fan records unified into a single fan profile (Vendor case study, published 2026-04-29) - [GuestReady](https://www.usedby.ai/case-studies/guestready-customer-io.md): **64%** reduction in unsubscribe rate (Vendor case study, published 2026-06-08) - [Takenos](https://www.usedby.ai/case-studies/takenos-customer-io.md): **99.8%** users landing in a lifecycle stage (Vendor case study, published 2026-07-11) - [Cosentino's Food Group](https://www.usedby.ai/case-studies/cosentino-s-food-group-customer-io.md): **15% to 48%** Email open rate (Vendor case study, published 2026-09-01) - [Showrilly](https://www.usedby.ai/case-studies/showrilly-customer-io.md): **62.3%** Open rate of the "Stuck in draft" automation (Vendor case study, published 2026-10-27) - [Klar](https://www.usedby.ai/case-studies/klar-customer-io.md): **14%** increase in first-transaction conversions (Vendor case study, published 2024-09-18) - [Livestorm](https://www.usedby.ai/case-studies/livestorm-customer-io.md): **135%** increase in average monthly G2 reviews (Vendor case study, published 2024-09-24) - [One Horizon](https://www.usedby.ai/case-studies/one-horizon-customer-io.md): story without a checked figure. (Vendor case study, published 2026-03-17) 12 of 15 stories shown. Every story: https://www.usedby.ai/case-studies ## Before you buy Read on Customer.io’s own pages; the quote was found on the cited page. | Fact | Value | Source | Checked | |---|---|---|---| | Security | SOC 2 Type II, HIPAA | [customer.io](https://customer.io/security) | 2026-11-13 | | Data residency | US, EU | [customer.io](https://customer.io/security) | 2026-11-13 | | Data processing terms | A data processing agreement is available. | [customer.io](https://customer.io/legal/dpa) | 2026-11-13 | | Pricing | Essentials: from $100 per month / billed monthly; Premium: from $1,000 per month / billed yearly; Enterprise: contact sales | [customer.io](https://customer.io/pricing) | 2026-11-13 | ## Alternatives Tools of the same or a competing category, from another vendor, ranked by public customers (every proof level, job posts included). - [Movable Ink](https://www.usedby.ai/tools/movable-ink.md): 66 public customers, 0 shared with Customer.io. - [Bloomreach](https://www.usedby.ai/tools/bloomreach.md): 56 public customers, 0 shared with Customer.io. - [Optimove](https://www.usedby.ai/tools/optimove.md): 50 public customers, 0 shared with Customer.io. - [Smartly](https://www.usedby.ai/tools/smartly.md): 48 public customers, 0 shared with Customer.io. - [Insider One](https://www.usedby.ai/tools/insider-one.md): 46 public customers, 0 shared with Customer.io. More: https://www.usedby.ai/alternatives/customer-io.md ## Frequently asked questions about Customer.io ### Who uses Customer.io? 35 companies use Customer.io (15 confirmed, 2 declared, 18 observed), including Buffer, Cosentino's Food Group, and Georgia Aquarium. ### What results do companies report with Customer.io? Companies that use Customer.io report these results in public case studies. Kinnect.Club: 80% of users who started the Nudge onboarding survey completed it and were enrolled in the monthly program (source: [customer.io](), checked November 12, 2026). Georgia Aquarium: monthly send volume increased by more than 2,000% (source: [customer.io](), checked November 12, 2026). Tigres UANL: Starting from 750,000 fan records accumulated across years of campaigns, ticketing, e-commerce, POS, and digital engagement (source: [customer.io](), checked November 12, 2026). ### How much does Customer.io cost? Customer.io lists these prices on its own website: Essentials: $100; Premium: $1,000 per month, billed yearly; Enterprise: price on request. Source: [customer.io](), checked November 13, 2026. ### Is Customer.io SOC 2 compliant? Customer.io states on its own website that it holds SOC 2 Type II and HIPAA. Source: [customer.io](), checked November 13, 2026. ### Where does Customer.io store customer data? Customer.io lists these data hosting regions on its own website: US and EU. Source: [customer.io](), checked November 13, 2026. ### Does Customer.io offer a data processing agreement (DPA)? Yes: Customer.io states on its own website that a data processing agreement (DPA) is available to customers. Source: [customer.io](), checked November 13, 2026. ### Which industries use Customer.io? The industries with the most Customer.io customers are Artificial Intelligence (6) and DevTools & Infrastructure (3). ### What are the alternatives to Customer.io? Ranked by public customers (every proof level counts, job posts included), the top Customer.io alternatives are Movable Ink (66 customers, 0 shared), Bloomreach (56 customers, 0 shared), Optimove (50 customers, 0 shared), and Smartly (48 customers, 0 shared). [See all Customer.io alternatives](https://www.usedby.ai/alternatives/customer-io.md). ### How does usedby know who uses Customer.io, and how current is it? Each company here links to a public page that names it as a Customer.io customer, and each line shows its proof level. A company that declared Customer.io itself is marked Declared. The latest check ran on November 12, 2026. [How usedby collects and checks its data](https://www.usedby.ai/methodology.md). --- Source: https://www.usedby.ai/tools/customer-io · How we check: https://www.usedby.ai/methodology