一、关于本协议
本协议是您与「中性浮力模拟」开发者张坤鹏（以下简称“开发者”或“我们”）之间，就您使用本应用及其付费功能订立的协议。
当您在本应用内勾选“我已阅读并同意《用户协议》”，并点击“确认并继续”后，本协议成立并生效。在您同意前，我们会向您提供完整协议文本。对于收费方式、已购权益、退款、安全风险、责任边界及争议解决等与您有重大利害关系的内容，我们将通过加粗、单独提示或弹窗等合理方式提请您注意。
如您不同意本协议，请勿点击“确认并继续”，并停止使用本应用。未成年人应在监护人同意和指导下阅读并决定是否接受本协议。
iOS 版本同时适用 Apple 的标准最终用户许可协议及相关平台规则。本协议是对本应用具体功能、付费规则和安全边界的补充，不替代 Apple 标准最终用户许可协议。
本应用另有《隐私政策》和《重要声明与安全提示》，与本协议共同适用。
二、服务内容
1. 本应用是一款包含游戏化机制的潜水中性浮力交互式模拟学习工具，帮助用户理解呼吸、浮力调节装置（BCD）、配重、深度、压力和浮力变化之间的基本关系，并提供模拟练习及设备本地练习记录。
2. 本应用不是正式潜水课程，不提供任何潜水资格、等级或认证，不进行真实水下技能考核，也不能替代合格潜水教练的指导、认证培训、泳池或开放水域训练。
3. 当前版本中，基础模式和休闲模式为免费功能；进阶模式为付费功能。每个进阶模式可免费试玩一次，之后需要购买相应解锁项目方可继续使用。
4. 本应用的功能、模式名称、界面和内容可能根据产品维护、安全要求及适用规则进行合理调整，但不会在没有合法依据的情况下追溯性取消或实质减少用户已经购买的核心权益。
三、许可与平台规则
本应用的软件许可同时受您下载本应用的平台所适用的标准最终用户许可协议和使用规则约束。本协议主要补充本应用的具体功能、付费规则、安全边界和用户行为要求。
在您遵守本协议、适用平台规则和法律法规的前提下，您可以为个人学习目的，在您拥有或控制的设备上使用本应用。未经开发者授权，不得转售或出租本应用，不得以本应用本身作为收费服务的主要内容，也不得以开发者、合作方或任何潜水培训、认证机构的名义开展商业宣传。
除适用法律、平台规则或第三方开源许可证另有允许外，您不得非法分发、再许可本应用，或使未经授权的第三方获得使用权。
如本协议与强制性法律规定冲突，以强制性法律规定为准；涉及平台许可、购买、账户及退款流程的事项，以适用的平台规则为准，但不得减损您依法享有的消费者权利。
四、使用限制
您不得：
1. 对本应用进行反向工程、反编译、破解，规避或破坏付费及解锁机制，或者制作、传播破解版本；适用法律明确允许或所含开源组件许可证另有约定的除外；
2. 将本应用用于违法活动，或者侵犯开发者、其他用户或第三方的合法权益；
3. 将本应用的模拟数据、评分、提示、称号、分析或任何其他结果，用于真实潜水计划、减压判断、返程气量判断、装备选择、事故处置、救援指挥或医疗判断；
4. 以任何方式宣称本应用获得潜水培训或认证机构的授权、认证、推荐或背书，除非开发者已取得明确书面授权。
五、付费与解锁
1. 当前进阶解锁项目采用一次性购买、非订阅、无自动续费的方式。一次购买可解锁购买页面明确列明的进阶练习模式及相关分析功能。
2. “一次性购买”表示同一购买项目不会按月或按年自动续费。购买所包含的具体模式、功能和权益，以购买页面及应用商店支付确认页面列明的信息为准。
3. 一次性购买包括购买时已经上线并明确列入该购买项目的功能，以及开发者明确说明包含在同一购买项目内的维护和更新；不当然包括未来单独立项、单独标价的独立产品、内容包或服务。
4. 具体价格、币种和可能适用的税费，以购买页面及应用商店支付确认页面显示为准。价格调整不影响调整前已经完成的购买。
5. iOS 版本中的数字功能解锁通过 Apple 应用内购买系统完成；在其他应用商店发行的版本中，通过该应用商店允许或指定的支付方式完成。具体交易主体、计费方式、商户身份及适用条款，以支付确认页面和相应平台规则为准。
6. 恢复购买：您通常可以使用完成购买时的同一应用商店账户，在符合平台规则的设备上恢复此前购买。能否在家庭成员之间共享，取决于应用商店规则和该购买项目的实际配置；除平台规则明确允许外，不同账户之间不共享购买权益。
7. 本应用可能在设备本地缓存解锁状态，但有效购买权益以应用商店返回的购买记录或有效权益为准。
六、免费试玩
1. 当前版本为每个进阶模式提供一次免费试玩。具体试玩范围、时长和可使用功能，以对应模式进入页面的提示为准。
2. 试玩资格依据当前设备中的本地状态记录判断，不与实名身份或应用商店账户绑定。
3. 因卸载重装、删除应用本地数据、设备或系统恢复、更换设备等原因，试玩状态可能发生变化，实际可用状态以本应用页面显示为准。
4. 如未来调整试玩判断方式、试玩范围或时长，我们将在变更生效前以显著方式告知；该调整不会影响用户已经完成的付费购买权益。
七、退款与购买问题
1. 通过 Apple App Store 或其他应用商店完成的购买，其退款申请由相应应用商店按照适用法律及平台退款政策处理。请通过购买平台提供的官方渠道提交申请。
2. 开发者通常无法直接向您的原支付方式发起退款，也不能代替应用商店作出最终退款决定；但会在平台规则和法律允许的范围内，配合提供购买权益、交付情况或技术问题所需的信息。
3. 如购买完成后出现功能未解锁、恢复购买失败或已购权益无法正常使用，请通过本协议列明的邮箱联系我们。我们将核查并在合理范围内提供修复、恢复权益或其他必要支持。
4. 是否退款、退款金额、退款渠道和处理时间，由购买平台依据适用法律、交易情况及其政策处理。
5. 本条对平台退款流程的说明，不排除依法应由开发者承担的修复、继续履行、恢复权益、退款、赔偿或其他责任。
6. 您依据中华人民共和国消费者权益保护相关法律享有的法定权利，不因本协议而减损。
八、未成年人
未成年人应在监护人同意和指导下使用本应用。任何付费购买均应经监护人同意，并使用监护人授权的支付方式。
如发生未成年人未经监护人同意的购买，请及时通过购买平台提供的退款渠道申请处理；我们将在平台规则和法律允许的范围内予以配合。
九、知识产权
本应用及其内容，包括但不限于程序、界面、图像、文字、音频、视频和内容组合，其知识产权归开发者或相应权利人所有，并受法律保护。本协议仅授予使用许可，不转让任何知识产权。
除本协议、应用内正常功能、适用法律、平台规则或相关许可证明确允许外，未经授权，您不得复制、修改、非法传播、出售或用于未经许可的商业用途。
本应用使用的第三方开源软件、字体、图标及其他第三方内容，按照其各自许可证或授权条款使用；本协议不会限制用户依法根据相应许可证享有的权利。
十、责任边界
1. 在适用法律允许的范围内，本应用按照当前可提供状态提供。开发者不保证本应用始终不中断、绝对不存在错误，或者永久兼容所有未来设备和操作系统；但仍将依法履行明确承诺的功能交付、质量保障、售后支持和消费者保护义务。
2. 本应用为模拟学习工具，不能替代真实潜水培训、专业潜水装备、潜水电脑或现场专业判断。用户不得将模拟内容用于真实潜水决策。
3. 因用户违反本协议、超出本应用设计用途使用，或擅自将模拟结果应用于真实潜水而产生的后果，由相关责任方依照适用法律承担。
4. 本协议不排除或限制依法不得排除或限制的责任，包括因开发者故意或重大过失造成的责任、依法应承担的人身损害责任以及用户的法定消费者权利。
十一、与其他文件的关系
《用户协议》主要规范软件使用、付费和购买权益；《隐私政策》主要规范个人信息处理；《重要声明与安全提示》主要说明模拟局限、潜水风险和不得用于真实潜水决策的边界。
三份文件共同适用。对于同一事项存在不一致的，优先适用针对该事项作出的特别约定；仍无法确定的，按照适用法律、通常理解以及不减损用户法定消费者权利的原则解释。任何文件均不得排除依法不得排除的责任或权利。
十二、隐私
我们对与您有关的信息的处理，适用《隐私政策》。请您一并阅读。
十三、协议变更
我们可能因功能变化、法律法规或平台规则更新本协议。涉及收费方式、已购权益、责任范围、争议解决或其他与用户有重大利害关系的实质变更，我们将在生效前通过应用内显著提示等方式告知，并在法律要求时重新取得您的明确同意。
一般文字修正、联系方式更新或不影响用户实质权利的调整，可以通过更新日期或应用内通知告知。未经合法依据，协议更新不会追溯性取消或实质减少您已完成购买的核心权益。
如您不同意实质变更，可以停止使用受变更影响的功能；您依法享有的退款、投诉及其他消费者权利不受影响。
十四、终止
如用户破解或规避付费机制、制作传播破解版本、侵犯本应用知识产权，或利用本应用实施违法行为，开发者可以依法采取与违法或违约程度相适应的必要措施，包括制止相关行为、限制被非法取得的功能、停止与该违法行为直接相关的技术支持，并依法追究责任。
对于能够纠正的一般违约，开发者原则上会先给予合理通知和改正机会；法律法规要求立即处理或存在现实安全风险的除外。
涉及软件许可终止的事项，同时按照下载平台适用的标准最终用户许可协议处理。终止不影响用户依法享有的已购权益、退款请求、投诉权利及依法不得排除的消费者权利。
十五、准据法与争议解决
本协议的订立、效力、解释、履行及争议解决，适用中华人民共和国大陆地区法律，但不排除依法必须适用的其他强制性规定。
因本协议产生的争议，双方应先友好协商。协商不成的，用户可以依法向消费者权益保护组织、市场监督管理部门或其他有权机构投诉，也可以向依法具有管辖权的人民法院提起诉讼。
十六、联系我们
服务提供者：张坤鹏
联系邮箱：eagle.zhang2026@qq.com
如您对本协议、购买权益或售后服务有疑问，可以通过上述邮箱联系我们。
1. About This Agreement
This Agreement is made between you and Zhang Kunpeng, the developer of Neutral Buoyancy Simulator (the “Developer,” “we,” or “us”), regarding your use of the App and its paid features.
This Agreement takes effect when you check “I have read and agree to the User Agreement” and tap “Confirm & Continue.” The complete text is made available before acceptance. Pricing, purchased entitlements, refunds, safety risks, limits of liability, dispute resolution, and other matters of material interest will be highlighted through bold text, separate notices, or dialogs where appropriate.
If you do not agree, do not tap “Confirm & Continue” and stop using the App. Minors should review and accept this Agreement only with the consent and guidance of a guardian.
The iOS version is also governed by Apple’s standard end-user license agreement and applicable platform rules. This Agreement supplements, and does not replace, Apple’s standard end-user license agreement.
The Privacy Policy and Important Notice & Safety Information also apply to the App.
2. Services
2.1 The App is an interactive scuba neutral-buoyancy learning simulator with gamified elements. It helps users understand basic relationships among breathing, the buoyancy control device (BCD), weighting, depth, pressure, and buoyancy, and provides simulated practice and local practice records.
2.2 The App is not a formal diving course, does not issue any diving qualification, rating, or certification, does not assess actual in-water skills, and cannot replace instruction by a qualified diving professional, recognized certification training, pool training, or open-water training.
2.3 In the current version, Basic Mode and Casual Mode are free. Advanced Mode is paid. Each advanced mode currently offers one free trial before purchase is required.
2.4 Features, mode names, interfaces, and content may be reasonably adjusted for maintenance, safety, or compliance purposes. Core entitlements already purchased will not be retroactively cancelled or materially reduced without a lawful basis.
3. License and Platform Rules
The software license is also subject to the standard end-user license agreement and usage rules of the platform from which you downloaded the App. This Agreement supplements the App’s features, payment rules, safety boundaries, and user-conduct requirements.
Subject to this Agreement, applicable platform rules, and law, you may use the App for personal learning purposes on devices you own or control. Without authorization, you may not resell or rent the App, make the App itself the main content of a paid service, or conduct commercial promotion in the name of the Developer, a partner, or any diver-training or certification organization.
Except as permitted by law, platform rules, or applicable open-source licenses, you may not unlawfully distribute or sublicense the App or give unauthorized third parties access to it.
Mandatory law prevails over conflicting terms. Platform licensing, purchases, accounts, and refund processes are governed by the applicable platform rules without reducing your statutory consumer rights.
4. Restrictions
You must not:
4.1 reverse engineer, decompile, crack, circumvent, or interfere with payment or unlocking mechanisms, or create or distribute cracked versions, except where expressly permitted by law or an applicable open-source license;
4.2 use the App for unlawful activity or infringe the lawful rights of the Developer, other users, or third parties;
4.3 use simulated data, scores, prompts, titles, analyses, or other results for real-dive planning, decompression decisions, turn-pressure decisions, equipment selection, incident response, rescue direction, or medical judgment;
4.4 claim that the App is authorized, certified, recommended, or endorsed by a diver-training or certification organization unless the Developer has received express written authorization.
5. Payment and Unlocking
5.1 The current Advanced unlock is a one-time purchase, not a subscription, and has no automatic renewal. One purchase unlocks the advanced practice modes and related analyses expressly listed on the purchase page.
5.2 “One-time purchase” means that the same purchase item is not billed monthly or annually. Included features and entitlements are those shown on the purchase page and store payment confirmation page.
5.3 A one-time purchase includes features that are live and expressly included at the time of purchase, and maintenance or updates expressly stated to be part of the same purchase item. It does not automatically include future standalone products, separately priced content packs, or services.
5.4 Price, currency, and applicable tax are shown on the purchase page and store payment confirmation page. Later price changes do not affect completed purchases.
5.5 Digital unlocking on iOS is processed through Apple’s in-app purchase system. Versions distributed through other app stores use payment methods permitted or designated by the relevant store. The transaction party, billing method, merchant identity, and applicable terms are shown during purchase and governed by the relevant platform.
5.6 Restore purchases: prior purchases can usually be restored on eligible devices using the same store account used for purchase. Family sharing depends on store rules and the configuration of the purchase item. Entitlements are not shared across different accounts unless the platform expressly permits it.
5.7 The App may cache unlock status locally, but valid purchase entitlement is determined by the purchase record or active entitlement returned by the app store.
6. Free Trial
6.1 The current version provides one free trial for each advanced mode. Trial scope, duration, and available features are shown on the relevant mode-entry page.
6.2 Trial eligibility is determined from local state on the current device and is not linked to a verified identity or store account.
6.3 Trial status may change after reinstalling the App, deleting local App data, restoring a device or system, or changing devices. The status shown in the App controls availability.
6.4 Future changes to trial eligibility, scope, or duration will be prominently disclosed before taking effect and will not affect completed purchases.
7. Refunds and Purchase Issues
7.1 Refund requests for purchases made through the Apple App Store or another app store are handled by the relevant store under applicable law and its refund policy. Submit requests through the store’s official channel.
7.2 The Developer generally cannot issue a refund directly to your original payment method or decide a store refund on the store’s behalf, but will provide information reasonably required regarding entitlement, delivery, or technical issues where permitted by law and platform rules.
7.3 If paid features do not unlock, purchase restoration fails, or purchased entitlements do not function, contact us using the email below. We will investigate and provide repair, entitlement restoration, or other necessary support within a reasonable scope.
7.4 Refund eligibility, amount, method, and timing are determined by the purchase platform under applicable law, the transaction circumstances, and its policy.
7.5 This description of store refund procedures does not exclude any repair, continued performance, entitlement restoration, refund, compensation, or other liability the Developer must bear under law.
7.6 Your statutory consumer rights are not reduced by this Agreement.
8. Minors
Minors should use the App with guardian consent and guidance. Any paid purchase must be approved by a guardian and use a payment method authorized by that guardian.
For a purchase made by a minor without guardian consent, promptly use the refund process provided by the purchase platform. We will cooperate as permitted by platform rules and law.
9. Intellectual Property
Intellectual property in the App and its content, including software, interfaces, images, text, audio, video, and content combinations, belongs to the Developer or the relevant rights holder and is protected by law. This Agreement grants a license to use the App and does not transfer intellectual property.
Except as expressly permitted by this Agreement, normal App functionality, applicable law, platform rules, or an applicable license, you may not copy, modify, unlawfully distribute, sell, or commercially use such content without authorization.
Third-party open-source software, fonts, icons, and other content are used under their respective licenses or authorization terms. This Agreement does not restrict rights granted under those licenses.
10. Liability Boundaries
10.1 To the extent permitted by law, the App is provided in its currently available state. The Developer does not guarantee uninterrupted or error-free operation or permanent compatibility with every future device or operating system, but remains responsible for promised delivery, quality, support, and consumer-protection obligations required by law.
10.2 The App is a learning simulator and cannot replace real diving training, professional diving equipment, a dive computer, or on-site professional judgment. Simulated content must not be used for real-dive decisions.
10.3 Consequences arising from use outside the App’s intended purpose or application of simulated results to real diving will be allocated among responsible parties under applicable law.
10.4 Nothing in this Agreement excludes or limits liability that cannot lawfully be excluded or limited, including liability for intentional misconduct or gross negligence, legally applicable personal-injury liability, and statutory consumer rights.
11. Relationship With Other Documents
The User Agreement governs use, payment, and purchased entitlements. The Privacy Policy governs personal-information handling. The Important Notice & Safety Information explains simulation limits, diving risks, and the prohibition on using simulated results for real-dive decisions.
All three documents apply. A specific provision addressing a matter prevails over a general provision. Unresolved ambiguity is interpreted under applicable law, ordinary understanding, and the principle that statutory consumer rights must not be reduced.
12. Privacy
Our handling of information relating to you is governed by the Privacy Policy.
13. Changes
We may update this Agreement due to feature, legal, regulatory, or platform changes. Substantive changes involving payment, purchased entitlements, liability, dispute resolution, or other matters of material interest will be prominently disclosed before taking effect, and renewed express consent will be obtained where required by law.
Minor wording corrections, contact updates, or changes that do not affect substantive rights may be disclosed through an updated date or in-App notice. Updates will not retroactively cancel or materially reduce purchased core entitlements without a lawful basis.
If you do not agree to a substantive change, you may stop using the affected feature. Statutory rights to refunds, complaints, and other remedies remain unaffected.
14. Termination
If a user cracks or circumvents payment, creates or distributes cracked versions, infringes App intellectual property, or uses the App for unlawful activity, the Developer may take lawful and proportionate measures, including stopping the conduct, restricting unlawfully obtained features, suspending technical support directly related to the violation, and pursuing legal responsibility.
For an ordinary breach that can be cured, the Developer will generally provide reasonable notice and an opportunity to correct it, unless immediate action is required by law or a real safety risk exists.
Software-license termination is also governed by the standard end-user license agreement of the download platform. Termination does not affect lawful purchased entitlements, refund requests, complaint rights, or consumer rights that cannot be excluded.
15. Governing Law and Disputes
The formation, validity, interpretation, performance, and dispute resolution of this Agreement are governed by the laws of mainland China, without excluding mandatory rules that must apply.
Disputes should first be addressed through friendly negotiation. If unresolved, users may complain to a consumer-protection organization, market-regulation authority, or other competent body, or bring proceedings before a court with lawful jurisdiction.
16. Contact
Service provider: Zhang Kunpeng
Email: eagle.zhang2026@qq.com
Contact us at the email above regarding this Agreement, purchased entitlements, or after-sales support.