Fair Usage Policy
This policy covers how CodeCogs' tools and hosted services may be used: fxEditor and its plugins, fxTeX and fxTeX Pro, fxTeX Server, fxCode and fxGraph, and My Home. It sits beside your licence agreement and the Terms of Use; how licensing works is the plain-English summary of all three.
Your equations are yours
- We claim no rights in the equations you make — they are maths. Once made, they can be used for any purpose, anywhere.
- So can the code generated from your own equations: the C++, and the Python, R and PHP wrappers, downloaded from My Home or produced by fxCode.
- What a licence covers is the tools used to make them. The editor on our site is free to try, and free for non-commercial work — see the editor on our site below.
The editor on our site
The equation editor on our home page is there as a demonstration, and for non-commercial use. Try it, experiment with it, and use it for your studies, teaching, research or a personal site, with nothing to pay.
Using it in a commercial setting to make equations you will publish — in a book, course, product, app or documentation that you sell or charge for access to — needs a licence. An Essential licence (£30 a year) covers it, and brings My Home for keeping the equations you make.
The equations themselves stay yours either way. And if you would rather write the LaTeX yourself, fxTeX is free for any use, commercial included.
What is free
- fxTeX is free for any use, commercial included, with no key and no limit. It converts in the reader's browser and never contacts our servers, so there is nothing for us to meter.
- fxEditor, and the CKEditor, TinyMCE and other plugins built on it, are free in non-commercial applications — anything you are not selling or charging for access to.
- fxGraph interactive graphs and calculators are free, including the code to embed one on your own site.
- fxCode: the first 100 LaTeX to C++ conversions in a month are free for testing and non-commercial use.
- fxTeX Server — equations as images from our servers — is free for light, unregistered use: the odd equation in a forum post or a blog. Unregistered use shares one small allowance. Past it, equations still render, with a short notice beneath asking the site to register. If you use it for free, please give us a Link Back.
Everything else — fxEditor in something you sell, the editor on our site for commercial work, fxTeX Pro, fxTeX Server for a website or app that relies on it, and My Home — needs a licence.
What a licence includes
Each licence covers one registered domain, with every subdomain beneath it, or an app identified by its licence key; Enterprise covers up to 5. Two things are measured.
Service loads are starts of fxEditor or fxTeX Pro on your site: each time a page opens the editor, or unlocks fxTeX Pro, under your licence. Your licence's band is how many it includes a month.
Rendering with fxTeX Server is measured as a rate, per domain or key: a burst — how many equations a page can ask for at once — and a rate at which it refills. Every visitor to your site draws on the same allowance. See fxTeX Server access for how a request is recognised as yours.
| Licence | Service loads | fxTeX Server rendering |
|---|---|---|
| Unlicensed | 0 | Bursts of 10, then 1 a second |
| Professional trial | 5,000 a month | Bursts of 1,000, then 67 a second |
| Essential | 200 a month | Bursts of 300, then 10 a second |
| Essential, with a Link Back | 400 a month | Bursts of 600, then 20 a second |
| Professional | 5,000 to 50,000 a month | Bursts of 1,000, then 67 a second |
| Enterprise | No limit | No limit |
The unlicensed allowance is one allowance shared by all unregistered use, everywhere; past it, equations still render, with a notice asking the site to register.
The Professional trial is free for 30 days, with everything Professional includes, to try before you buy.
Going past your allowance. A rendering request past your rate is turned away for a few seconds and then succeeds again — an image request receives a small picture saying so, not a broken image. If your site regularly needs more than its licence includes, of either kind, we will be in touch, using your registered details, about the band or licence that fits. Please do not work around an allowance by spreading one site across several registrations or keys.
My Home
My Home — your own configured editor, saved equations with their names, tags and units, fxGraph calculators, and code downloads — comes with an Essential, Professional or Enterprise licence, for everyone in the organisation that holds it.
- Who belongs. The people who buy and manage a licence are its administrators: they see its licences, keys and billing. Anyone who signs in with an email address at the licence's registered domain joins the organisation as a member, with My Home and nothing to do with billing. Public email services such as Gmail or Outlook never count as an organisation's domain.
- What you save is shared with your organisation. The equations you save, with their names, descriptions, links and tags, are found by everyone in your organisation through search. Please do not save anything there you would not share with them.
- Limits. Each person can keep up to 10,000 saved equations, with up to 12 tags on each.
- Code downloads from your saved equations — C++, and wrappers for Python, R and PHP — are included with the licence.
- fxQuiz — quizzes made from your organisation's saved equations, for students — is included too. Each person can keep up to 1,000 quizzes of up to 50 problems each, and the quizzes and their problems are yours to print, copy and use with your students.
- Online quizzes are answered by students in the editor and marked as they go, for up to 2,000 candidates each. We do not ask students for their names or anything else about them: they sign in with a candidate number and a four-character code, and the codes are worked out when needed rather than kept. Resetting a quiz deletes every candidate, note and answer, and changes every code.
- It is for people. Please do not drive My Home from scripts or use it as storage for anything other than your equations.
- When a licence ends, its organisation's members lose My Home until it is renewed.
Keeping your service running
To avoid any disruption to your service, please:
- Try Professional free, or buy a licence, if you plan to use our services routinely. We will keep you informed of any changes that might affect you.
- Tell us in advance if you expect anything out of the ordinary — a launch, an exam season, a sudden jump in visitors.
- Tell us if you see any interruption or irregularity in the service. We cannot watch how it behaves from every corner of the world, so your experience in the field matters to us; without it, we assume everything is working.
Link Backs
Like everyone, CodeCogs benefits from links from your site back to us, called a 'Link Back', and we'd appreciate a mention whenever and wherever you can. Please recommend us to your friends and colleagues, and promote fxEditor on your website with one of the badges below — which we ask of anyone using our rendering service for free.
The Link Back reward
An Essential licence whose website links back to fxeditor.codecogs.com gets twice its allowance, at no extra cost: 400 service loads a month instead of 200, and rendering in bursts of 600, then 20 a second instead of bursts of 300, then 10 a second. Put one of the badges below on a page of the site your licence is for, then give us that page's address. We check it straight away, and once a week after that: while the link is there the reward stays; if it goes, your licence returns to Essential's allowance until it is back.
To claim it, sign in as the administrator of your Essential licence and come back to this section.
Badges
Copy the code beside the one you want; it links to fxeditor.codecogs.com.
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