The TOEFL (Test of English as a Foreign Language) and the IELTS (International English Language Testing System) are both standardized tests used to assess English language proficiency for non-native English speakers. 

Here are some key differences in their preparation:

1. **Format**: The TOEFL is entirely computer-based, while the IELTS includes both paper-based and computer-based options.

2. **Sections**: The TOEFL consists of four sections: Reading, Listening, Speaking, and Writing. The IELTS has four sections as well: Listening, Reading, Writing, and Speaking.

3. **Accent**: The TOEFL typically includes American accents in its listening and speaking sections, while the IELTS may include a variety of accents, including British, Australian, Canadian, and New Zealand.

4. **Scoring**: The TOEFL uses a scale of 0-120, with each section scored separately. The IELTS uses a 9-band scale, with each section scored individually and then averaged for an overall band score.

5. **Preparation Materials**: Both tests have official preparation materials available, including practice tests, sample questions, and study guides. Additionally, there are many third-party resources and test prep courses available for both exams.

Ultimately, the choice between TOEFL and IELTS often depends on the requirements of the institution or organization you are applying to, as well as personal preferences regarding test format and content.

Toefl [Test of english as a foreign language] is done by people who want to study in foreign countries[english speaking countries] but ielts [english language testing system ]is done by people who want to work/study in english speaking countries[us,uk,newzealand,australia etc.]

Both[ielts/toefl] test your proficiency of english language.