Mathjax Inc
Public records show a registered, tax-exempt organization in good standing.
What it says it does
MathJax, Inc., provides software for displaying mathematical notation in web pages while making it accessible to users who have disabilities such a blindness or dyslexia. MathJax can be used to make educational, research materials, and publications on STEM subjects accessible to the visually impaired, improving the quality of life for them, and their ability to progress in their educations and careers.
- Income
- $161,980
- Spending
- $160,813
- Reserves
- 3.8 months of spending
- Largest source of income
- donations and private grants, 100%
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Financial health
Good: 74 out of 100. Higher than 42% of charities in its peer group (education, under $250k).
Reserves
20 of 35Spendable reserves would cover 3.8 months of spending.
Debt
20 of 20It owes 0% of what it owns.
Living within its means
12 of 15Income exceeded spending by 1% of income.
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Governance
This organization files the short tax form, which does not ask about boards, policies or audits. That is normal for a small charity and is not a mark against it.
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Impact evidence
Describes programs. Its tax return describes what it does but we have found no measurable results in it.
Programs described in its return (2)
- $113,865 spent. Development of the MathJax software library, including the speech rule engine that underlies its support for the visually impaired. The software is freely available to anyone. Usage information is difficult to acquire, as we do not have access to the logs for all installations of MathJax, but one of the major content delivery networks (CDNs) lists MathJax among its top 10 most popular libraries (of over 1 million being served), with over 3.1 billion requests per month. MathJax can also be incorporated into other projects, and one of the major mechanisms for doing so (npm.js) lists over 150 projects that do. The source code repository on GitHub shows 13,000 followers for the MathJax projects. We made the official v4.0.0 release in August, a major update for MathJax including significant improvements to its assistive support. A v4.1.0 release followed in December, addressing some issues and request from our users.
- $38,600 spent. Documentation for how to use MathJax in webpages and incorporate it into other applications, for accessible mathematical notation. We do not have statistics on how many users view the documentation (it is not hosted on a machine for which we have access to the server logs), but Google's search report indicates more than 11,800 searches per month that reach www.mathjax.org (though the documentation is hosted elsewhere). The MathJax issue tracker had more than 164 issues posted in 2025, with nearly all of them receiving an answer from MathJax developers. The v4.0.0 also included a major update to the on-line documentation, expanding sections that were limited or missing in the v3 documentation, adding numerous new examples, and improving clarity throughout. The documentation is now over 450 pages (with 58 pages just about what's new in v4 alone).
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Legitimacy checks
Is it registered with the IRS? Passed.
Listed in the IRS master file of tax-exempt organizations as a 501(c)(3) charitable organization.
Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.
Has the IRS revoked its tax-exempt status? Passed.
Not on the IRS automatic revocation list.
Source: Automatic revocation of exemption list, Internal Revenue Service, file dated October 13, 2026.
Are donations tax-deductible? Passed.
On the IRS list of organizations eligible to receive tax-deductible contributions.
Source: Publication 78 data: organizations eligible for tax-deductible contributions, Internal Revenue Service, file dated October 13, 2026.
Is it keeping up with its IRS filings? Passed.
Most recent return on file covers the year ending December 2025.
Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.
How long has it been tax-exempt? Passed.
Recognized by the IRS since November 2022.
Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.
Is it in good standing with state regulators? Passed.
Not on California's list of charities barred from soliciting. Other states are not yet checked.
Source: May Not Operate or Solicit for Charitable Purposes list, California Attorney General, Registry of Charities and Fundraisers, file dated October 21, 2026.
Ratings and checks are our reading of public records, using the published method. They are not a statement about anyone's honesty. If you work for this organization, you can send corrections or results, confirm you want gifts through Veridonate, or ask to be removed from giving.