- ChargeOver
- Chatwork
- ClickSend SMS
- Clockify
- ConvertKit
- CompanyHub
- ClickUp
- Chargebee
- Click Funnels
- Convertful
- Canny
- Clearout
- Customerly
- Convert Box
- Clust
- Continually
- Coassemble
- Constant Contacts
- Cognito Forms
- CallRail
- Curated
- Campaign Monitor
- Close
- Convertri
- CalendarHero (Zoom.ai)
- Clearbit
- Capsule CRM
- Chatbot
- Credit Repair Cloud
- Cisco Webex (Teams)
- Cisco Webex (Meetings)
- Cloze
- Chatforma
- Cloudflare
- ClearoutPhone
- Circle
- CallFire
- ClickMeeting
- Chatter
- Convert Builder
- CloudConvert
- Coda
- Citrix ShareFile
- CloudFill
- Clientify
- ConvertCreator
- Clientjoy
- Cobot
- Chatrace
- Clickatell
- CertifyMe
- ConvergeHub
- Crove (Legacy)
- Checkvist
- Clinked
- CallPage
- Customer.io
- ConvertAPI
- Cheat layer
- CompanyCam (In Review)
- Crisp
- CleverReach
- Content Snare
- Copper
- Clio
- Convertu
- ChartMogul
- Checkfront
- Chatra
- CabinPanda
- CrowdPower
- Coupontools
- Createtos
- CLOSEM
- Crove
- Cyberimpact
- Confluence
- CraftMyPDF.com
- Cliengo
- CATS
- CodeREADr
- Cloudstream Funnels
- Caflou
- Certopus
- cloudlayer.io
- Concord
- ClickBank
- Contact Form 7
- condoo
- ChatGPT (GPT-5.1-chat-latest & GPT-5.1)
- Calendly
- ClickDesigns
- Contentful
- CINC
- Chatfuel
- Campaign Cleaner
- Cal.com
- Chatdaddy
- Crypto Valley Journal
- Code By Integrately
- Certifier
- CallHub
- CoachAccountable
- CheckoutJoy
- Cue Growth
- Copilot
- Chatsistant
- CodeQR
- ClickSign
- CloudYa
- Creatomate
- Crawlbase
- change.photos
- Cliniko
- CircleCi
- ClicData
- Clustdoc
- Carrd
- CentralStation CRM
- Caspio
- ContentStudio
- CAMB.AI