# Qase, Tuskr vs BrowserStack Comparison

| | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Star Rating** | 4.7 out of 5 | 4.6 out of 5 | 4.4 out of 5 | 
| **Total Reviews** | 307 | 586 | 3,338 | 
| **Largest Market Segment** | Small-Business (59.0% of reviews) | Small-Business (48.5% of reviews) | Small-Business (40.9% of reviews) | 
| **Entry Level Price** | $0.00 | $0.00 1 user per month | $0.00 1 user plan | 

---
## Top Pros & Cons

### Qase

Pros:
- Ease of Use (65 reviews)
- Customer Support (53 reviews)

Cons:
- Limited Customization (20 reviews)
- Testing Difficulties (16 reviews)

### Tuskr

Pros:
- Ease of Use (176 reviews)
- Test Cases (119 reviews)

Cons:
- Limited Customization (57 reviews)
- Poor Reporting (53 reviews)

### BrowserStack

Pros:
- Ease of Use (754 reviews)
- Real Devices (725 reviews)

Cons:
- Slow Performance (324 reviews)
- Slow Loading (297 reviews)

---
## Ratings Comparison
| Rating | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
  | **Meets Requirements** | 9.0 (271 reviews) | 9.0 (459 reviews) | 8.8 (2766 reviews) | 
  | **Ease of Use** | 9.3 (275 reviews) | 9.3 (472 reviews) | 8.9 (2847 reviews) | 
  | **Ease of Setup** | 9.4 (203 reviews) | 9.4 (344 reviews) | 8.9 (1846 reviews) | 
  | **Ease of Admin** | 9.3 (112 reviews) | 9.2 (111 reviews) | 8.8 (634 reviews) | 
  | **Quality of Support** | 9.6 (253 reviews) | 9.1 (424 reviews) | 8.7 (2368 reviews) | 
  | **Has the product been a good partner in doing business?** | 9.2 (98 reviews) | 9.1 (100 reviews) | 8.8 (601 reviews) | 
  | **Product Direction (% positive)** | 9.6 (271 reviews) | 9.5 (446 reviews) | 9.3 (2760 reviews) | 

---
## Pricing

### Qase

#### Entry-Level Pricing

Plan: Free

Price: $0.00

Description: For students, small projects, and non-profits.

Key Features:
- Up to 3 users
- 500Mb for attachments
- Test case management

[Browse all 4 editions](https://www.g2.com/products/qase/pricing)

#### Free Trial

Yes

### Tuskr

#### Entry-Level Pricing

Plan: Free

Price: $0.00 1 user per month

Key Features:
- 5 projects
- 1k test cases
- 1 GB file space

[Browse all 4 editions](https://www.g2.com/products/tuskr/pricing)

#### Free Trial

Yes

### BrowserStack

#### Entry-Level Pricing

Plan: Free Trial

Price: $0.00 1 user plan

Key Features:
- Instant Access to Real Devices
- 30 mins each of interactive browser and mobile app testing
- 100 mins of automated browser testing

[Browse all 32 editions](https://www.g2.com/products/browserstack/pricing)

#### Free Trial

Yes

---
## Features Comparison By Category

### Load Testing Tools

| Product | Score | Reviews |
|---|---|---|
| **Qase** | N/A | N/A |
| **Tuskr** | N/A | N/A |
| **BrowserStack** | 8.1/10 | 140 |

#### Functionality

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Stress Testing** | Not enough data | Not enough data | 7.8 (129 reviews) | 
| **Extreme Cases** | Not enough data | Not enough data | 7.7 (122 reviews) | 
| **Test Variety** | Not enough data | Not enough data | 8.5 (129 reviews) | 

#### Reporting

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Reporting** | Not enough data | Not enough data | 8.1 (119 reviews) | 

### Test Management

| Product | Score | Reviews |
|---|---|---|
| **Qase** | 8.7/10 | 190 |
| **Tuskr** | 8.9/10 | 412 |
| **BrowserStack** | 8.6/10 | 531 |

#### Functionality

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Test Repository** | 9.4 (186 reviews) | 9.2 (363 reviews) | 8.6 (330 reviews) | 
| **Integration** | 8.3 (170 reviews) | 8.8 (339 reviews) | 8.7 (414 reviews) | 
| **Test Diversity** | 9.1 (178 reviews) | 9.1 (328 reviews) | 8.8 (323 reviews) | 

#### Management

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Reporting** | 8.7 (178 reviews) | 8.8 (360 reviews) | 8.5 (324 reviews) | 
| **Version Control** | 8.3 (165 reviews) | 8.8 (319 reviews) | Feature Not Available | 
| **Scaling** | 8.6 (166 reviews) | 8.8 (333 reviews) | 8.2 (372 reviews) | 

### Mobile App Testing

| Product | Score | Reviews |
|---|---|---|
| **Qase** | N/A | N/A |
| **Tuskr** | N/A | N/A |
| **BrowserStack** | 8.7/10 | 1565 |

#### Functionality

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Test Feedback** | Not enough data | Not enough data | 8.7 (1186 reviews) | 
| **Test Variety** | Not enough data | Not enough data | 8.7 (1170 reviews) | 
| **Emulation** | Not enough data | Not enough data | 9.0 (1393 reviews) | 

#### Management

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Test History** | Not enough data | Not enough data | 8.5 (1129 reviews) | 
| **Automation** | Not enough data | Not enough data | 8.5 (1187 reviews) | 
| **Organization** | Not enough data | Not enough data | 8.4 (1061 reviews) | 

### Digital Accessibility Platforms

| Product | Score | Reviews |
|---|---|---|
| **Qase** | N/A | N/A |
| **Tuskr** | N/A | N/A |
| **BrowserStack** | 8.3/10 | 147 |

#### Monitoring

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Compliance Monitoring** | Not enough data | Not enough data | 8.3 (139 reviews) | 
| **Real-Time Monitoring** | Not enough data | Not enough data | 8.3 (130 reviews) | 
| **Dynamic Crawling** | Not enough data | Not enough data | Feature Not Available | 
| **Task Management** | Not enough data | Not enough data | Feature Not Available | 

#### Reporting

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Prioritization** | Not enough data | Not enough data | 8.3 (128 reviews) | 
| **Site Comparison** | Not enough data | Not enough data | 8.5 (130 reviews) | 

#### Automation

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Automated Testing** | Not enough data | Not enough data | Feature Not Available | 
| **Automated Scan** | Not enough data | Not enough data | 8.1 (131 reviews) | 

#### Functionality

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Automated Regression Testing** | Not enough data | Not enough data | 8.2 (133 reviews) | 
| **Customizable Testing Tools** | Not enough data | Not enough data | Feature Not Available | 
| **Multi-User Testing** | Not enough data | Not enough data | 8.4 (131 reviews) | 
| **Filtering ** | Not enough data | Not enough data | Feature Not Available | 
| **Overlay Engine** | Not enough data | Not enough data | Feature Not Available | 

#### Generative AI

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **AI Text-to-Speech** | Not enough data | Not enough data | Feature Not Available | 

#### Agentic AI - Digital Accessibility Platforms

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Autonomous Task Execution** | Not enough data | Not enough data | 8.7 (5 reviews) | 
| **Multi-step Planning** | Not enough data | Not enough data | 8.7 (5 reviews) | 
| **Cross-system Integration** | Not enough data | Not enough data | 8.6 (6 reviews) | 
| **Proactive Assistance** | Not enough data | Not enough data | 8.7 (5 reviews) | 

### Digital Accessibility Tools

| Product | Score | Reviews |
|---|---|---|
| **Qase** | N/A | N/A |
| **Tuskr** | N/A | N/A |
| **BrowserStack** | 8.2/10 | 144 |

#### Support

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Recommendations** | Not enough data | Not enough data | 8.5 (121 reviews) | 
| **Progress Tracking** | Not enough data | Not enough data | 8.3 (123 reviews) | 

#### Reporting

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Page Reports** | Not enough data | Not enough data | 8.5 (125 reviews) | 
| **Broken Link Checker** | Not enough data | Not enough data | Feature Not Available | 

#### Functionality

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Individual Page Auditing** | Not enough data | Not enough data | 8.4 (126 reviews) | 
| **Quality Assurance Dashboard** | Not enough data | Not enough data | 8.4 (130 reviews) | 
| **Integration** | Not enough data | Not enough data | 8.2 (122 reviews) | 

#### Generative AI

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **AI Text-to-Speech** | Not enough data | Not enough data | Feature Not Available | 

#### Agentic AI - Digital Accessibility Tools

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Autonomous Task Execution** | Not enough data | Not enough data | 8.1 (15 reviews) | 
| **Multi-step Planning** | Not enough data | Not enough data | 7.7 (15 reviews) | 
| **Cross-system Integration** | Not enough data | Not enough data | 8.4 (18 reviews) | 
| **Proactive Assistance** | Not enough data | Not enough data | 7.7 (15 reviews) | 

### Automation Testing

| Product | Score | Reviews |
|---|---|---|
| **Qase** | 8.8/10 | 89 |
| **Tuskr** | N/A | N/A |
| **BrowserStack** | 8.3/10 | 984 |

#### Functionality 

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Test Feedback** | 8.9 (83 reviews) | Not enough data | 8.6 (900 reviews) | 
| **Test History** | 8.9 (84 reviews) | Not enough data | 8.6 (893 reviews) | 
| **Customization** | 8.5 (82 reviews) | Not enough data | 8.2 (857 reviews) | 
| **Test Variety** | 8.9 (82 reviews) | Not enough data | 8.5 (882 reviews) | 

#### Automation

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Organization** | 8.9 (80 reviews) | Not enough data | 8.4 (843 reviews) | 
| **Reliability** | Feature Not Available | Not enough data | 8.5 (886 reviews) | 
| **Thoroughness** | Feature Not Available | Not enough data | 8.5 (854 reviews) | 

#### Agentic AI - Automation Testing

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Autonomous Task Execution** | 8.1 (6 reviews) | Not enough data | 8.0 (63 reviews) | 
| **Natural Language Interaction** | 8.9 (6 reviews) | Not enough data | 7.6 (56 reviews) | 
| **Proactive Assistance** | 8.9 (6 reviews) | Not enough data | 7.9 (57 reviews) | 

### Software Testing

| Product | Score | Reviews |
|---|---|---|
| **Qase** | 7.6/10 | 21 |
| **Tuskr** | 8.9/10 | 52 |
| **BrowserStack** | 7.8/10 | 191 |

#### Agentic AI - Software Testing

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Autonomous Task Execution** | 7.9 (19 reviews) | 8.8 (45 reviews) | 7.9 (177 reviews) | 
| **Natural Language Interaction** | 7.6 (14 reviews) | 8.8 (42 reviews) | 7.7 (149 reviews) | 
| **Proactive Assistance** | 7.5 (14 reviews) | 9.1 (41 reviews) | 7.7 (150 reviews) | 

### AI Software Testing Tools

| Product | Score | Reviews |
|---|---|---|
| **Qase** | N/A | N/A |
| **Tuskr** | N/A | N/A |
| **BrowserStack** | 8.0/10 | 74 |

#### AI Test Generation &amp; Authoring

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **UI-Based Test Generation** | Not enough data | Not enough data | 8.2 (31 reviews) | 
| **Natural Language Test Creation** | Not enough data | Not enough data | 7.7 (27 reviews) | 
| **Test Coverage Suggestions** | Not enough data | Not enough data | 8.1 (29 reviews) | 

#### Test Maintenance &amp; Resilience 

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Self-healing** | Not enough data | Not enough data | 7.9 (28 reviews) | 
| **Dynamic Element Locators** | Not enough data | Not enough data | 7.8 (24 reviews) | 
| **AI-Powered Test Maintenance** | Not enough data | Not enough data | 8.4 (35 reviews) | 

#### Execution &amp; Analytics

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Intelligent Reporting** | Not enough data | Not enough data | 7.7 (36 reviews) | 
| **Visual Anomaly Detection** | Not enough data | Not enough data | 8.2 (34 reviews) | 
| **Root Cause Analysis** | Not enough data | Not enough data | 8.2 (33 reviews) | 

### AI Accessibility Tools

| Product | Score | Reviews |
|---|---|---|
| **Qase** | N/A | N/A |
| **Tuskr** | N/A | N/A |
| **BrowserStack** | N/A | N/A |

#### AI-Powered Detection &amp; Analysis - AI Accessibility Tools

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Dynamic Content Change Detection** | Not enough data | Not enough data | Not enough data | 
| **Context-Aware Accessibility Detection** | Not enough data | Not enough data | Not enough data | 
| **Computer Vision for UI Interpretation** | Not enough data | Not enough data | Not enough data | 

#### Automated Remediation &amp; Optimization - AI Accessibility Tools

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Keyboard Navigation Optimization** | Not enough data | Not enough data | Not enough data | 
| **AI-Based ARIA Role &amp; Attribute Correction** | Not enough data | Not enough data | Not enough data | 
| **Automated Alt Text Generation** | Not enough data | Not enough data | Not enough data | 

#### Continuous Monitoring &amp; Compliance - AI Accessibility Tools

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Regression Detection for Accessibility Issues** | Not enough data | Not enough data | Not enough data | 
| **Automated WCAG &amp; ADA Compliance Alignment** | Not enough data | Not enough data | Not enough data | 
| **Continuous Accessibility Monitoring** | Not enough data | Not enough data | Not enough data | 

#### Integrations &amp; Workflow Enablement - AI Accessibility Tools

| Feature | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **CMS &amp; Web Platform Integration** | Not enough data | Not enough data | Not enough data | 

---
## Categories
**Shared Categories (2):** [Test Management Tools](https://www.g2.com/categories/test-management), [Software Testing Tools](https://www.g2.com/categories/software-testing)

**Unique to Qase (1):** [Automation Testing Tools](https://www.g2.com/categories/automation-testing-tools)


**Unique to BrowserStack (7):** [AI Software Testing Tools](https://www.g2.com/categories/ai-software-testing-tools), [Load Testing Tools](https://www.g2.com/categories/load-testing-tools), [Mobile App Testing Software](https://www.g2.com/categories/mobile-app-testing), [Digital Accessibility Platforms ](https://www.g2.com/categories/Digital-accessibility-platforms), [Digital Accessibility Tools ](https://www.g2.com/categories/digital-accessibility-tools), [Automation Testing Tools](https://www.g2.com/categories/automation-testing-tools), [AI Accessibility Tools Software](https://www.g2.com/categories/ai-accessibility-tools)


---
## Reviewer Demographics

### By Company Size

| Segment | Qase | Tuskr | BrowserStack | 
|---|---|---|---|
| **Small-Business** | 59.0% | 48.5% | 40.9% | 
| **Mid-Market** | 33.6% | 38.1% | 38.7% | 
| **Enterprise** | 7.5% | 13.4% | 20.4% | 

### By Industry

#### Qase

- **Computer Software:** 31.5%
- **Information Technology and Services:** 21.6%
- **Financial Services:** 5.8%
- **Program Development:** 3.4%
- **Hospital &amp; Health Care:** 2.7%
- **Telecommunications:** 2.4%
- **Computer Games:** 1.7%
- **Entertainment:** 1.7%
- **Marketing and Advertising:** 1.7%
- **Health, Wellness and Fitness:** 1.4%
- **Other:** 26.0%

#### Tuskr

- **Computer Software:** 24.9%
- **Information Technology and Services:** 24.5%
- **Marketing and Advertising:** 4.3%
- **Computer &amp; Network Security:** 2.9%
- **Financial Services:** 2.9%
- **Retail:** 2.3%
- **Accounting:** 2.1%
- **Automotive:** 2.1%
- **Education Management:** 1.8%
- **Consulting:** 1.6%
- **Other:** 30.5%

#### BrowserStack

- **Computer Software:** 22.1%
- **Information Technology and Services:** 21.6%
- **Financial Services:** 5.5%
- **Marketing and Advertising:** 3.9%
- **Retail:** 2.8%
- **Banking:** 2.3%
- **Insurance:** 2.0%
- **Hospital &amp; Health Care:** 1.9%
- **Education Management:** 1.7%
- **Computer &amp; Network Security:** 1.5%
- **Other:** 34.7%

---
## Alternatives

### Alternatives to Qase

- [Zephyr Enterprise](https://www.g2.com/products/zephyr-enterprise/reviews) — 4.1/5 stars (80 reviews)
- [TestRail](https://www.g2.com/products/testrail/reviews) — 4.4/5 stars (611 reviews)
- [PractiTest](https://www.g2.com/products/practitest/reviews) — 4.3/5 stars (233 reviews)
- [TestLink](https://www.g2.com/products/testlink/reviews) — 4.4/5 stars (61 reviews)
- [testomat.io](https://www.g2.com/products/testomat-io/reviews) — 4.8/5 stars (94 reviews)
- [Kualitee](https://www.g2.com/products/kualitee/reviews) — 4.6/5 stars (222 reviews)
- [Postman](https://www.g2.com/products/postman/reviews) — 4.6/5 stars (1788 reviews)
- [Panaya Smart Testing and Change Intelligence](https://www.g2.com/products/panaya-smart-testing-and-change-intelligence/reviews) — 4.5/5 stars (539 reviews)
- [UiPath Agentic Automation](https://www.g2.com/products/uipath-agentic-automation/reviews) — 4.6/5 stars (7582 reviews)
- [Agentforce 360 Platform (formerly Salesforce Platform)](https://www.g2.com/products/agentforce-360-platform-formerly-salesforce-platform/reviews) — 4.5/5 stars (4006 reviews)

### Alternatives to Tuskr

- [TestRail](https://www.g2.com/products/testrail/reviews) — 4.4/5 stars (611 reviews)
- [PractiTest](https://www.g2.com/products/practitest/reviews) — 4.3/5 stars (233 reviews)
- [Panaya Smart Testing and Change Intelligence](https://www.g2.com/products/panaya-smart-testing-and-change-intelligence/reviews) — 4.5/5 stars (539 reviews)
- [Postman](https://www.g2.com/products/postman/reviews) — 4.6/5 stars (1788 reviews)
- [Agentforce 360 Platform (formerly Salesforce Platform)](https://www.g2.com/products/agentforce-360-platform-formerly-salesforce-platform/reviews) — 4.5/5 stars (4006 reviews)
- [Hotjar by Contentsquare](https://www.g2.com/products/hotjar-by-contentsquare/reviews) — 4.3/5 stars (342 reviews)
- [Kualitee](https://www.g2.com/products/kualitee/reviews) — 4.6/5 stars (222 reviews)
- [Userback](https://www.g2.com/products/userback/reviews) — 4.7/5 stars (287 reviews)
- [Harness Platform](https://www.g2.com/products/harness-platform/reviews) — 4.6/5 stars (281 reviews)
- [Ranorex Studio](https://www.g2.com/products/ranorex-studio/reviews) — 4.2/5 stars (258 reviews)

### Alternatives to BrowserStack

- [accessiBe](https://www.g2.com/products/accessibe/reviews) — 4.7/5 stars (1560 reviews)
- [Pcloudy](https://www.g2.com/products/pcloudy/reviews) — 4.4/5 stars (87 reviews)
- [Silktide](https://www.g2.com/products/silktide/reviews) — 4.8/5 stars (283 reviews)
- [Perfecto](https://www.g2.com/products/perfecto/reviews) — 4.4/5 stars (95 reviews)
- [Katalon True Platform](https://www.g2.com/products/katalon-true-platform/reviews) — 4.4/5 stars (224 reviews)
- [TestRail](https://www.g2.com/products/testrail/reviews) — 4.4/5 stars (611 reviews)
- [Siteimprove](https://www.g2.com/products/siteimprove/reviews) — 4.6/5 stars (432 reviews)
- [Sauce Labs](https://www.g2.com/products/sauce-labs/reviews) — 4.3/5 stars (178 reviews)
- [Acquia Web Governance](https://www.g2.com/products/acquia-web-governance/reviews) — 4.5/5 stars (157 reviews)
- [Level Access Accessibility Platform](https://www.g2.com/products/level-access-accessibility-platform/reviews) — 4.5/5 stars (235 reviews)

---
## Top Discussions

### Qase

- Title: [What is Qase?](https://www.g2.com/discussions/what-is-qase) — 2 comments
  > **Top comment:** "Qase is a modern Test Management System that allows you to maintain your entire testing model, collect all of your testing results - both manual and..."
- Title: [What is Qase used for?](https://www.g2.com/discussions/what-is-qase-used-for) — 1 comment
  > **Top comment:** "Test case management"

### Tuskr

- Title: [What is Tuskr used for?](https://www.g2.com/discussions/what-is-tuskr-used-for) — 3 comments
  > **Top comment:** "Tuskr is a test management tool that helps teams plan, organize, and track their testing activities. It’s mainly used by software testers and QA teams to..."
- Title: [Tuskr can be integrated with other tools?](https://www.g2.com/discussions/tuskr-can-be-integrated-with-other-tools) — 1 comment, 1 upvote *(includes official response)*
  > **Top comment:** "Hi Gayathri, Tuskr can seamlessly integrate with over 400 applications through Zapier and Integromat. You can visit https://tuskr.app/integrations for more..."

### BrowserStack

- Title: [What are the benefits of automating a test case?](https://www.g2.com/discussions/what-are-the-benefits-of-automating-a-test-case) — 7 comments, 1 upvote
  > **Top comment:** "There are several benefits to automating a test case, including:

Increased efficiency: Automated testing allows for faster and more efficient execution of..."
- Title: [What can BrowserStack do?](https://www.g2.com/discussions/what-can-browserstack-do) — 4 comments
  > **Top comment:** "conduct testing in browsers on different platforms and devices, as well as the application. More process automation."
- Title: [What is App automate in BrowserStack?](https://www.g2.com/discussions/what-is-app-automate-in-browserstack) — 4 comments, 1 upvote
  > **Top comment:** "App automate in BrowserStack allows you to run you mobile app automation on real devices:..."
- Title: [Which of the following features are supported by BrowserStack automate ?*?](https://www.g2.com/discussions/which-of-the-following-features-are-supported-by-browserstack-automate) — 4 comments
  > **Top comment:** "Comment deleted by user."
- Title: [What is Bird Eats Bug used for?](https://www.g2.com/discussions/what-is-bird-eats-bug-used-for) — 2 comments
  > **Top comment:** "It&#39;s a tool designed to capture issues, launched by the well-known company BrowserStack."

---
**Source:** [G2.com](https://www.g2.com) | [Comparison Page](https://www.g2.com/compare/qase-vs-tuskr-vs-browserstack)

