Captio AI vs InnoCaption

Only for eligible users based in the US with a US cell number, home address and SSN; US residents can keep using it on a trip abroad if they tell support first. The app was not found in the UK, Canada or Mexico App Stores.

Sources: InnoCaption availability outside the United States (InnoCaption Help Center), Real-time Call Caption App (InnoCaption (Mezmo Corporation)), Apple listing

InnoCaption captions incoming, outgoing and three-way calls, voicemail and 911 calls. It works with your existing number through call forwarding.

Sources: Real-time Call Caption App (InnoCaption (Mezmo Corporation)), Apple App Store listing, Features (InnoCaption (Mezmo Corporation))

InnoCaption Web captions meetings you dial into by phone, or sends InnoCaption Bot (AI captions only) to Teams, Meet, Zoom and Webex. The app can't caption FaceTime; a separate InnoCaption Video app makes captioned video calls.

Sources: Use InnoCaption for Zoom and other video conference meetings (InnoCaption Help Center), Use InnoCaption Bot (InnoCaption Help Center), Get captions for FaceTime calls (InnoCaption Help Center), Who We Are (InnoCaption (Mezmo Corporation))

InnoCaption says its FCC-funded service can't be used when both people are in the same room, including a classroom. The same company has separate apps that aren't FCC-funded: InnoScribe (free, on Google Play) and Bridge Live (with the paid Bridge product).

Sources: In-person captioning (InnoCaption Help Center), Classroom captioning (InnoCaption Help Center), Google Play listing, Mezmo Technologies Inc pricing page

You can switch between live stenographers (CART), available 24/7, and AI captions before or during a call. If every stenographer is busy, an optional AI fallback takes over.

Sources: Real-time Call Caption App (InnoCaption (Mezmo Corporation)), Stenographers (InnoCaption (Mezmo Corporation)), Caption modes on InnoCaption (InnoCaption Help Center), Choose between stenographer and AI caption modes (InnoCaption Help Center), "All live captioners are busy" message (InnoCaption Help Center)

AI captions can use a secondary language from a list of over 20, such as Spanish, Chinese, Vietnamese and Arabic. Live stenographers caption English only; the Security page still says AI supports Spanish in addition to English.

Sources: Languages available for captioning (InnoCaption Help Center), Caption modes on InnoCaption (InnoCaption Help Center), Security (InnoCaption (Mezmo Corporation))

InnoCaption says captions match the language spoken on the call and it does not translate speech.

Source: Languages available for captioning (InnoCaption Help Center)

You need a mobile data or Wi-Fi connection to use InnoCaption.

Sources: Real-time Call Caption App (InnoCaption (Mezmo Corporation)), Apple App Store listing

InnoCaption Bot shows who is speaking in online meetings. On phone calls you can choose to caption only the other person, or your own voice too.

Sources: Use InnoCaption Bot (InnoCaption Help Center), Features (InnoCaption (Mezmo Corporation))

Call transcripts are kept on your device and can be backed up to your own iCloud or Google account. Without a backup, deleting the app deletes them; they are not stored on InnoCaption's servers.

Sources: View and share call transcripts (InnoCaption Help Center), Back up and restore call transcripts (InnoCaption Help Center), Security (InnoCaption (Mezmo Corporation))

A Summarize button turns a saved call transcript into a summary with key points. The transcript goes to InnoCaption's server temporarily for this.

Sources: Summarize transcripts (InnoCaption Help Center), Apple App Store listing

You can add names, places and technical terms to a Custom Word List.

Sources: Add words to your Custom word list (InnoCaption Help Center), Apple App Store listing

Transcripts stay on your device, and call audio and transcripts are not kept after the call, except voicemail. The privacy notice says your data is never used to train AI models; stenographers hear only the other person.

Sources: InnoCaption (Mezmo Corporation) privacy policy, Call confidentiality (InnoCaption Help Center), Security (InnoCaption (Mezmo Corporation))

Registration asks for your full name, date of birth, last four digits of your SSN, home address and cell number, sent to the FCC's TRS Fund Administrator. You self-certify your hearing loss; no doctor's note is needed.

Sources: Personal information required for registration (InnoCaption Help Center), Real-time Call Caption App (InnoCaption (Mezmo Corporation)), New IP CTS Registration Requirements FAQs (Federal Communications Commission)

The FCC lists Mezmo Corporation (dba InnoCaption) with full IP CTS and conditional IP Relay certification. The service is paid from the federal TRS Fund.

Sources: Internet-Based TRS Providers (Federal Communications Commission), InnoCaption eligibility and why it's free (InnoCaption Help Center), New IP CTS Registration Requirements FAQs (Federal Communications Commission), Internet Protocol (IP) Captioned Telephone Service (Federal Communications Commission)

Free for eligible US users with hearing loss or a speech disability, with no limit on the number or length of calls.

Sources: Real-time Call Caption App (InnoCaption (Mezmo Corporation)), Usage limits for InnoCaption (InnoCaption Help Center)

The app is free with no in-app purchases on the App Store. Bridge, the company's separate workplace product, costs from US$300 per device plus US$80 a month (US prices, October 2026).

Sources: Apple App Store listing, Mezmo Technologies Inc pricing page