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Contributing to 2fa.directory

All the data is managed through a series of JSON files so it may be useful to read up on the JSON syntax.

To add a new site, go to the data files and get familiar with how it is set up. There is one file per entry named after the domain, located in the subdirectory starting with the first letter of the domain. Site icons are stored in folders corresponding to each of those entries in their own folder. Please ensure any JSON files that are edited conform to our .editorconfig.

Guidelines

  1. Don't break the build: We have a simple continuous integration system setup with GitHub Actions. If your pull request doesn't pass, it won't be merged. GH Actions will only check your changes after you submit a pull request.
  2. Use a Nice Icon: SVG is the preferred format. If possible, please also run the image through an optimizing utility such as svgo (command line) or SVGOMG (web) to reduce the file size. If an SVG icon is not available, the icon should be a PNG with a resolution of 32x32, 64x64, or 128x128. If possible, run the PNG image through an optimizing utility such as TinyPNG so that it ideally is below 3 kB in size.
  3. HTTPS links: All sites that support HTTPS should also be linked with an HTTPS address.
  4. Similarweb top 200K: A new site that is not already listed has to be within the Similarweb top 200,000 global rankings. You can check the ranking of a site here.
  5. No 2FA providers: We do not list 2FA providers, such as Authy, Duo or Google Authenticator.

Site Criteria

The following section contains rough criteria and explanations regarding what websites should be listed in 2fa.directory. If one of the following criteria is met, it belongs in 2fa.directory:

  1. Personal Info: Any site that deals with personally identifiable information (PII) such as name, photo, age, address, etc.
  2. Data: This criterion relates to data that is either important or sensitive. Websites detailed in Criteria 1 also fit this criteria.
  3. Money: Any site that deals with money.
  4. Control: This criteria is more general, in that it includes sites that give access to things that may infringe upon criteria 1, 2, or 3. An example of this is a website that allows remote access to a device.

If you have any questions regarding whether or not a site matches one of the criteria, simply open an issue and we'll take a look.

Excluded Sites

A list of excluded sites and categories has also been created with various categories and sites that we have opted not to list on 2fa.directory. You should check the list in the EXCLUSION.md file to make sure that your site is eligible before submitting a pull request.

New Sites

First and foremost, make sure the new site meets our definition requirements of two-factor authentication.

If you are adding multiple sites to the 2FA Directory, please create a new git branch for each website, and submit a separate pull request for each branch. More information regarding how to create new git branches can be found on GitHub's Help Page.

Adding a new website should be pretty straightforward. Create a JSON file in the corresponding subdirectory as shown in the following example:

{
  "Site Name": {
    "domain": "site.com",
    "img": "site.com.png",
    "tfa": [
      "sms",
      "call",
      "email",
      "totp",
      "u2f",
      "custom-software",
      "custom-hardware"
    ],
    "documentation": "<link to site TFA documentation>",
    "categories": [
      "category1",
      "category2"
    ]
  }
}
  • The domain should point to the main page of the service, not the login page (usually the root domain, not a subdomain).
  • Categories must be selected from the values listed in categories.json.
  • The default value for the icon is <domain>.svg, but can be overridden by an img field.
  • If you would like the site's link on 2fa.directory to be different from https://<domain>, you can use a url field to specify this.

Adding a site that supports TFA

Sites that provide TFA can be noted with the tfa field and should contain the TFA methods supported. If a site does provide TFA, it is strongly recommended that you add the documentation field where public documentation is available. Sites supporting TFA must not have a contact property.

The following is an example of a website that supports TFA:

{
  "YouTube": {
    "domain": "youtube.com",
    "tfa": [
      "sms",
      "call",
      "totp",
      "custom-software",
      "u2f"
    ],
    "documentation": "https://www.google.com/intl/en-US/landing/2step/features.html",
    "categories": [
      "entertainment"
    ]
  }
}

Adding a site that does not support TFA

If a site does not provide TFA, the contact field should be included. Inside this object,

  • The twitter field should be included if the site uses Twitter.
  • Facebook can also be included using the facebook field.
  • Email can be included using the email field.
  • Contact forms can be included using the form field.
  • Only email or a contact form can be added, not both. Emails are preferred over contact forms.
  • The language field inside contact can be included for websites whose social media pages/communication channels do not use English. The language codes should be lowercase ISO 639-1 codes.

Do not add the tfa, documentation, or recovery fields.

The following is an example of a website that does not support TFA:

{
  "Netflix": {
    "domain": "netflix.com",
    "contact": {
      "facebook": "netflix",
      "twitter": "Netflixhelps"
    },
    "categories": [
      "entertainment"
    ]
  }
}

Exceptions & Restrictions

If a site requires the user to do something out of the ordinary to set up 2FA or if 2FA is only available to specific account types, you can document this using the notes field.

{
  "Site Name": {
    "domain": "site.com",
    "tfa": [
      "totp"
    ],
    "documentation": "<link to site TFA documentation>",
    "notes": "Specific text goes here.",
    "categories": [
      "category"
    ]
  }
}

Adding a site that is only available or is prevalent in specific regions

If a site (with or without 2FA) is only available in certain countries or most users are located in certain countries - for example a government site or a local retailer - you can note this with the regions field.

{
  "Site Name": {
    "domain": "site.com",
    "tfa": [
      "totp"
    ],
    "documentation": "<link to site TFA documentation>",
    "categories": [
      "category"
    ],
    "regions": [
      "us",
      "ca"
    ]
  }
}

The country codes should be lowercase ISO 3166-1 codes.

If you want to distinguish the entry from others of the same company or service in order to provide a unique name, use "Site Name [CC]" where CC is the country code.

Excluded Regions

If a site is available globally apart from a specific region, this can be noted using the regions array. Excluded regions should be prefixed with a - symbol to exclude the site from that region. Region codes and excluded region codes should not be used together, as adding a region code automatically excludes the site from other regions. The example below shows a site that is available in all regions apart from us.

{
  "Site Name": {
    "domain": "site.com",
    "tfa": [
      "totp"
    ],
    "documentation": "<link to site TFA documentation>",
    "categories": [
      "category"
    ],
    "regions": [
      "-us"
    ]
  }
}

Other Properties

  • additional-domains If a site exists at another domain in addition to the main domain that is listed in the domain field, you can mark this with the additional-domains property.
{
  "Site Name": {
    "domain": "site.com",
    "additional-domains": [
      "site.net",
      "site.io"
    ],
    "tfa": [
      "totp"
    ],
    "documentation": "<link to site TFA documentation>",
    "categories": [
      "category"
    ]
  }
}
  • recovery The recovery field can be used to link to account recovery documentation about what to do if you lose access to your 2FA method.
{
  "Site Name": {
    "domain": "site.com",
    "tfa": [
      "totp"
    ],
    "documentation": "<link to site TFA documentation>",
    "recovery": "<link to site TFA recovery documentation>",
    "categories": [
      "category"
    ]
  }
}
  • custom-software/custom-hardware If a site uses a proprietary software or hardware method, you can add specific details of what is being used. Examples would be Authy or non-U2F security keys.
{
  "Site Name": {
    "domain": "site.com",
    "tfa": [
      "custom-software",
      "custom-hardware"
    ],
    "custom-software": [
      "Authy"
    ],
    "custom-hardware": [
      "Yubico OTP"
    ],
    "documentation": "<link to site TFA documentation>",
    "categories": [
      "category"
    ]
  }
}

Pro Tips

  • See Guideline #2 about icons. The SVG file should go in the corresponding img/ folder.

  • For the sake of organization and readability, it is appreciated if your site chunk follows the same order as the example earlier in the document.

  • If a site supports TFA, their contact information is not needed and must be left out.

Categories

Entries on 2fa.directory have to be put into categories. An entry can have one or many categories. Below is a table of each available category, the name of the category, which title it has on 2fa.directory with a description.

Name Title Description
backup Backup and Sync Online backup and cross-device file synchronization
banking Banking Online banking platforms
betting Betting Betting and Gambling
cloud Cloud Computing "Serverless" cloud computing
communication Communication Online communication platforms excluding email and social media
creativity Creativity Art and design software
crowdfunding Crowdfunding
cryptocurrencies Cryptocurrencies Any site whose main purpose is handling cryptocurrencies
developer Developer Development software
domains Domains DNS Registrars
education Education Non-university education platforms
email Email Email providers
entertainment Entertainment Audio/Video entertainment excluding games
finance Finance Financial, insurance and pension services
food Food Food and beverage services
gaming Gaming Games and game platforms. Sites for buying games should be listed in Retail
government Government Government portals. Excluding education
health Health Health and fitness platforms
hosting Hosting/VPS Online website hosting, VPS, and dedicated server rentals
hotels Hotels and Accommodations Hotels and short term accommodation providers
identity Identity Management Authentication providers, Single Sign On platforms
investing Investing Investment platforms
iot IoT Internet of Things and device management platforms
legal Legal Legal aid services
marketing Marketing & Analytics Marketing campaign providers and analytics services
payments Payments Payment providers
post Post and Shipping Postal and logistics providers
remote Remote Access Remote device access platforms
retail Retail Online retail platforms
security Security Online security and anti-malware services. Excluding VPN and identity management
social Social Social networks
task Task Management Task management and to-do services
tickets Tickets and Events Ticketing and event platforms
transport Transport Transportation services including public transport and airlines
universities Universities University online platforms
utilities Utilities Household utilities including electricity, gas, water, phone and internet providers
vpn VPN Providers
other Other Sites that don't fit in any other category

When adding a category to an entry remember to use the category name and not the title. If you're unsure which category is correct for an entry, ask for assistance by creating a new issue.

A Note on Definitions

Authorization

There are lots of different ideas of what constitutes two-factor authentication and what doesn't, so it stands to reason that we should clarify a bit. For the purposes of this site, two-factor authentication is defined as any service provided as a redundant layer for account authentication. Services that provide authorization redundancy are certainly appreciated, but should not be considered two-factor authentication.

As an example, a site that prompts you for an authentication token following user login would be considered two-factor authentication. A site that does not prompt you for a token upon login, but prompts you for a token when you try to perform a sensitive action would not be considered two-factor authentication.

For context, check out the discussion in issue #242.

Passwordless Authentication

Many sites now offer passwordless authentication, replacing the traditional password (something you know) with a different factor, such as something you have or are. Examples include sites allowing users to log in using a U2F key or a magic link without requiring a second factor. While these methods enhance security, it's important to note that our 2FA Directory focuses on platforms providing two distinct factors for authentication. For passkey-specific options, we invite you to explore the Passkeys Directory. The repository is 2factorauth/passkeys.