Walang Paywalls. Mag-master ng Bawat Exam | Zero Paywalls. Master Every Exam |
Maging mahusay sa AP®, IB®, SAT®, at Competitive Math gamit ang interactive na mga aralin, walang limitasyong pagsasanay, flashcards, personalized na mock exams, at ang sarili mong AI tutor. Lahat sa isang lugar, at lahat ay ganap na libre.
Libre Magpakailanman. Walang Paywalls.
#1
Pagpipilian ng Mag-aaral
80+
Mga Kurso
100%
Libre Habang Buhay
∞
Mga Tanong sa Pagsasanay
130+
Mga Boluntaryo
25,000+
Masayang mga Mag-aaral
Mga Kurikulum
Naghahanap ba ng ibang kurikulum o kurso? Magbukas ng ticket sa Discord
Mag-browse ng mga kurso
No courses found for the selected curriculum.
Student Testimony
Stellar was the lifesaver I needed for my APs
I was completely overwhelmed with my APs at first. I didn’t have the motivation to study or the right resources to succeed. But Stellar changed everything. Its immersive experience kept me motivated, and the high-quality study guides, practice problems, and mock tests gave me the tools I needed. And it’s completely free too!
— 9th Grade AP Student
Feature Comparison
What Makes Stellar Better?
Feature Comparison
We know how frustrating it can be to find a truly free app, one without ads, subscriptions, or hidden paywalls.
That’s why we created a solution, with the best of all your favorite apps, that puts users first.
 |  |  |  |  |  | |
|---|---|---|---|---|---|---|
| Infinite AI-Powered Practice | ||||||
| High Quality Practice Questions | ||||||
| High Quality Study Guides | ||||||
| Unlimited AP FRQ Practice | ||||||
| Full-Length AP Practice Exams | ||||||
| Gamification and Streak | ||||||
| Visual-Based AI Assistant | ||||||
| Practice from Custom Notes and Flashcards | ||||||
| Interactive Lessons and Practice | ||||||
| Leaderboard | ||||||
| Authentic Competitive Math Questions | ||||||
| Intuitive Competitive Math Explanations | ||||||
| Competitive Math Visual Tracker | ||||||
| Price (per month) | FREE $0.00 | $4.00 (Khanmigo) | $18.00 | $19.99 | $27.99 | ≈$40.00 (per Book) |
Mga Interaktibong Aralin
Matuto gamit ang Interaktibo , Mataas na Kalidad na mga Aralin
Ang aming mga aralin ay dinisenyo upang tulungan kang matuto nang mas epektibo at mahusay. Ang mga ito ay komprehensibo, interactive, at ginagawang madaling maunawaan ang anumang konsepto.
Math Graphing Exercise
Please plot the function, on the coordinate plane. You can plot the function by simply clicking two points that are on it.
Grammar Labeling Exercise
For the sentence below, please highlight the nouns yellow, the action verbs green, the prepositions blue, the conjunctions pink, and any adjective or participle purple.
Interactive Coding Exercise
Write python code to find the
Loading editor...
Economics Guided Exercise
The price of Coke, the substitute of Pepsi has increased. How does this change in consumer preference affect the price and quantity of Pepsi? Please move the supply and/or demand curves to demonstrate this change and complete the sentence below.
After the increase of Coke's price, demand for Pepsi , and supply for Pepsi . The price of Pepsi and the quantity of Pepsi .
Foreign Language Tracing Exercise
Trace the Chinese Character below.
Mga Interaktibong Pagsasanay
Magsanay gamit ang Interaktibong Pagsasanay
Makilahok sa mga interactive na gawain tulad ng pag-label, paglutas ng problema, at mga simulation na nagpapadali sa pag-unawa at pagpapanatili ng mga kumplikadong konsepto.
Walang Katapusang Pagsasanay
Mga Walang Hanggan Tanong sa Pagsasanay gamit ang AI
Mag-access ng walang limitasyong, AI-generated na mga tanong na nagbibigay ng tuluy-tuloy na mga oportunidad sa pagsasanay, na tinitiyak na ikaw ay handa at may kumpiyansa sa bawat paksa.
Multiple Choice Question
Choose the best option:
MCQ Estilo ng Pagsusulit
Walang-limitasyong AP®, IB®, at SAT® Estilo MCQs at Pagsasanay na Pagsusulit
Maghanda nang lubusan para sa lahat ng paksa ng AP® na may iba't ibang mock exam na idinisenyo upang gayahin ang tunay na kondisyon ng pagsusulit.
FRQ Estilo ng Pagsusulit
Walang-hanggang AP® at IB® Estilo FRQ Pagsasanay
Sanayin ang mga free-response questions (FRQs) gamit ang mga materyales na ekspertong ginawa upang gayahin ang mga format ng pagsusulit ng AP®.
“In the late 19th and early 20th centuries, American foreign policy was primarily defined by the pursuit of expansionism, driven by a belief in American exceptionalism and a duty to spread democracy and capitalism around the globe. This era saw the United States engage in several conflicts and interventions, including the Spanish-American War of 1898, which not only resulted in territorial acquisitions like Puerto Rico and the Philippines but also marked a significant shift in the nation's identity as a global power. This aggressive foreign policy was justified by arguments of moral obligation, presenting the annexation of overseas territories as a benevolent act aimed at uplifting less fortunate nations, thus embodying a humanitarian facade coupled with economic interests.”
Source: John A. Thompson, historian, “The United States and the Age of Imperialism”, 2003
“Contrarily, the rise of American imperialism during this period can be seen as a hypocritical endeavor, masking underlying motives of economic exploitation and nationalistic fervor under the guise of moral superiority. Critics of this foreign policy argued that instead of liberating oppressed peoples, the United States sought to reproduce its own dominance in foreign lands for the benefit of American corporations and investors. The consequences of such policies were often detrimental, leading to unrest and resistance in the territories affected, as exemplified by the Philippine-American War, where the rhetoric of liberation was starkly at odds with the reality of subjugation and violence. This imperialistic approach not only contradicted the founding principles of liberty and self-determination but also illuminated the darker side of America's global ambitions, showing that the nation's self-image was often built on the subjugation of others.”
Source: David S. Mason, historian, “Imperialism and American Identity”, 2010
Using the excerpts, respond to parts a, b, and c.
a. Briefly describe one major difference between Thompson’s and Mason’s interpretations of American foreign policy in the late 19th and early 20th centuries.
b. Briefly explain how one historical event or development from 1865 to 1917 not directly mentioned in the excerpts could be used to support Thompson’s interpretation.
c. Briefly explain how one historical event or development from 1865 to 1917 not directly mentioned in the excerpts could be used to support Mason’s interpretation.
Login to Stellar to Auto-Score this FRQ
The relationship between urbanization and social patterns has significant implications for both human behavior and policy planning.
A. Define urbanization in the context of human geography.
B. Describe ONE social impact of urbanization on family structures in urban areas.
C. Explain how urbanization can lead to the increased prevalence of social issues, such as crime or poverty.
D. Discuss how urban planning can address the challenges associated with rapid urbanization.
E. Explain the role of public transportation in influencing urban development and social equity.
F. Describe how suburbanization may impact the demographic characteristics of urban areas.
G. Explain the degree to which gentrification alters the cultural landscape of neighborhoods in urban settings. (Response must indicate the degree [low, moderate, high] and provide an explanation.)
Login to Stellar to Auto-Score this FRQ
The temperature of a lake is modeled by a continuous and differentiable function, T(t), which measures the temperature in degrees Celsius at time t (in hours). The following table displays selected values of T(t) over a period of 8 hours.
| t (hours) | 0 | 1 | 3 | 5 | 8 |
|---|---|---|---|---|---|
| T(t) (°C) | 15 | 17 | 20 | 23 | 25 |
(a) Using a right Riemann sum with the intervals [0, 1], [1, 3], [3, 5], and [5, 8], approximate the value of the integral
(b) According to the Mean Value Theorem for Integrals, must there exist a time c in [0, 8] such that T'(c) equals the average value of T over that interval? Justify your answer.
(c) Using the average temperature calculated in part (a), estimate the total increase in temperature from t = 0 to t = 8. Provide the mathematical setup for your calculations.
(d) When the temperature of the lake is 25°C, the rate of change of the temperature is given by
Login to Stellar to Auto-Score this FRQ
This question involves the TemperatureRecord class, which records daily temperatures for a week. You will write two methods in the TemperatureRecord class that help analyze the temperature data.
/**
* An array that stores the daily temperatures.
* The size of the array is 7, representing the temperatures for a week.
*/
private int[] dailyTemperatures;
/**
* The constructor initializes the daily temperatures.
* @param temperatures An array of integers representing the daily temperatures.
* Preconditions: temperatures.length == 7
*/
public TemperatureRecord(int[] temperatures) {
dailyTemperatures = temperatures;
}
/**
* Returns the average temperature recorded for the week, rounded to the nearest integer.
* @return The average temperature.
*/
public int calculateAverageTemperature() { /* to be implemented in part (a) */ }
/**
* Returns the number of days with a temperature above the specified threshold.
* @param threshold The temperature threshold.
* @return The count of days with temperatures above the threshold.
* Preconditions: threshold >= -100 && threshold <= 100
*/
public int countDaysAboveThreshold(int threshold) { /* to be implemented in part (b) */ }
}
(a) Write the calculateAverageTemperature method, which calculates the average temperature for the week. The method should add up all the temperatures in the dailyTemperatures array and divide by the number of days (7). If the sum is 0, due to initialization conditions, ensure it returns 0 as the average.
Class information for this question
private int[] dailyTemperatures
public TemperatureRecord(int[] temperatures)
public int calculateAverageTemperature()
public int countDaysAboveThreshold(int threshold)
(b) Write the countDaysAboveThreshold method. This method iterates through the dailyTemperatures array and counts how many days have temperatures above the provided threshold. The count is then returned.
Consider the following examples:
| Input Temperatures | Threshold | Output |
|---|---|---|
| [70, 75, 80, 85, 90, 95, 100] | 80 | 4 |
| [60, 65, 70, 75, 80, 85, 90] | 80 | 3 |
| [0, -5, -10, -15, -20, -25, -30] | -10 | 2 |
Each input will be a valid set of 7 daily temperatures.
Complete the countDaysAboveThreshold method, ensuring that it iterates correctly through the dailyTemperatures array.
Class information for this question
private int[] dailyTemperatures
public TemperatureRecord(int[] temperatures)
public int calculateAverageTemperature()
public int countDaysAboveThreshold(int threshold)
Login to Stellar to Auto-Score this FRQ
In a 2021 TED Talk, renowned author and philosopher Alain de Botton stated: "Our culture has created the illusion that the arrived-at life is a happy life. We believe that all we need to do is find our dream job, buy a house, or travel to exotic places, and we will be fulfilled. Yet true contentment comes from a deeper understanding of ourselves, our relationships, and the acceptance of life’s inherent challenges and uncertainties."
Write an essay that argues your position on the extent to which de Botton's claim about the pursuit of happiness and fulfillment is valid.
In your response you should do the following:
- Respond to the prompt with a thesis that presents a defensible position.
- Provide evidence to support your line of reasoning.
- Explain how the evidence supports your line of reasoning.
- Use appropriate grammar and punctuation in communicating your argument.
Login to Stellar to Auto-Score this FRQ
AMC Question
Choose the best option:
Walang-hanggang Pagsasanay sa Kompetisyon
Magsanay para sa Competitions
Maghanda para sa mga kumpetisyon tulad ng AMC, AIME, at F=ma na may libu-libong na-curate na problema at walang-hanggang pagsasanay. Subaybayan ang iyong pag-unlad, umakyat sa mga leaderboard, at buuin ang iyong rating sa pamamagitan ng isang gamified system.
Makipag-chat kay Nova
Kilalanin ang iyong bagong Visual AI Assistant
Makakuha ng 24/7 na tulong mula sa iyong biswal, intuitive, at step-by-step na tutor na tumutulong sa iyo na maunawaan ang anumang konsepto.
Hello, how are you?
Using content from
Hello! Welcome to the demo of Nova. You have 6 options of potential questions to choose from. Sign Up for Stellar to ask more questions. How can I help you today?
Reviews
Trusted by Thousands of Students
Reviews
Now it's your turn to experience the true power of Stellar
Great free resource
@burritopig
Looks & works like AP
@dylanh70607
Super helpful & organized
@tvisha
Solid AP practice
@is_mishra
Easy to navigate
@evan
Covers important APs
@sharkibubble
Clean UI + leaderboard
@emilie
Amazing math competition prep and infinite practice
@javajellyfish
Feels like real AP material
@alou
Amazing all-in-one platform
@coffeecreamer
Aesthetic & works well
@pengoh_
Amazing UI and courses
@newrepublic
This is beyond an app
@zachyhads13
Incredible free resource
@thunderbee
Super helpful and completly free
@presstart20
Y'all are santa for studying
@infinium
Final Clarifications
Frequently Asked Questions
Ang Aming mga Kasosyo
Nakikipagtulungan kami sa iba pang mga organisasyon at nonprofit na sumusuporta sa aming misyon na palawakin ang pagiging accessible ng edukasyon. Sa pamamagitan ng mga partnership, nagsusumikap kaming maghatid ng pinakamahusay na nilalaman sa pinakamalawak na madla.
Sumali sa 25,000+ Mag-aaral na Nakakapasa na sa Kanilang mga Pagsusulit
Marahil ang tanging study site na makikita mo sa buong araw na may zero paywalls.
Ang ibang "libreng" study sites ay galit sa amin dahil dito