比較一覧表
| 順位 | サービス名 | 料金 | 特徴 | 日本語対応 | プラン | 評価 |
|---|---|---|---|---|---|---|
| 1位 | 1Password | From $2.99/month | Most polished UI, great family sharing | ◎ | 有料 | ★★★★☆ 4.5 |
| 2位 | Bitwarden | Free – $1/month | Open-source with high reliability | ○ | 有料 | ★★★★☆ 4.4 |
| 3位 | Dashlane | From $3.33/month | Built-in VPN & dark web monitoring | △ | 有料 | ★★★★☆ 4.2 |
| 4位 | NordPass | From $1.49/month | NordVPN integration, xChaCha20 encryption | ○ | 有料 | ★★★★☆ 4.1 |
| 5位 | LastPass | Free – $3/month | Strong browser integration | ○ | 有料 | ★★★☆☆ 3.8 |
1Password
“I have too many passwords to remember.” “I keep reusing the same password everywhere.” Sound familiar?
According to a 2025 study, the average person manages over 100 online accounts. Email, social media, online banking, shopping sites — setting a unique, strong password for each and remembering them all is simply impossible for humans.
In this article, we compare 5 password managers in detail to help you find the right one. We cover everything from free options to plans for families and teams.
What Is a Password Manager and Why Do You Need One?
A password manager is a tool that encrypts and centrally stores all your passwords. You only need to remember one master password to securely access everything else.
The Dangers of Password Reuse
“Using an easy-to-remember password across multiple sites” is one of the most dangerous security habits.
- Credential stuffing attacks: Attackers automatically try leaked passwords from one site on others. If you reuse passwords, accounts fall like dominoes
- Personal data exposure: If your email account is compromised, attackers can use password resets to infiltrate other services
- Financial losses: Hijacked banking or e-commerce accounts can lead to direct monetary damage
With a password manager, you can auto-generate and store unique, random passwords for every site. The only password you need to remember is the master password.
Key Features of Password Managers
- Password generation: Auto-create strong passwords with letters, numbers, and symbols
- Auto-fill: Automatically fill login credentials in browsers and apps
- Encrypted storage: Protect passwords with strong encryption (AES-256, etc.)
- Multi-device sync: Sync passwords across PC, phone, and tablet
- Security audit: Detect and flag weak or reused passwords
How to Choose a Password Manager
Check these 5 key factors to find the right fit:
1. Security
The most important factor. Verify these capabilities:
- AES-256 encryption: Military-grade encryption standard
- Zero-knowledge architecture: Even the provider can’t see your data
- Two-factor authentication (2FA): Additional verification beyond the master password
- Third-party security audits: Regular independent security reviews
2. Usability
No matter how secure, you won’t stick with it if it’s hard to use.
- Is the UI intuitive and clear?
- How well does the browser extension work (auto-fill accuracy)?
- Is the mobile app easy to navigate?
3. Pricing
Compare free plan limitations and paid plan value.
- What can you do on the free plan (device limits, sync restrictions)?
- Monthly and annual pricing for paid plans
- Family plan availability and value
4. Browser & OS Compatibility
Make sure it works with your daily tools.
- Support for Chrome, Firefox, Safari, Edge, and other major browsers
- Support for Windows, macOS, iOS, and Android
- Passkey support
5. Sharing Features
Can you securely share passwords with family or team members?
- Family plan capacity and pricing
- Business administration features
- Secure password sharing methods
Top 5 Password Managers: Full Comparison
| Feature | 1Password | Bitwarden | LastPass | Dashlane | NordPass |
|---|---|---|---|---|---|
| Free plan | No | Yes | Limited (1 device type) | Limited (1 device) | Limited (1 device) |
| Individual (monthly) | $2.99 | $0.83 | $3.00 | $4.99 | $1.49 |
| Family (monthly) | $4.99 (5 users) | $3.33 (6 users) | $4.00 (6 users) | $7.49 (10 users) | $2.79 (6 users) |
| Password limit | Unlimited | Unlimited | Unlimited | Unlimited | Unlimited |
| Device sync | Unlimited | Unlimited | Paid only | Paid only | Paid only |
| Encryption | AES-256 | AES-256 | AES-256 | AES-256 | XChaCha20 |
| Zero-knowledge | Yes | Yes | Yes | Yes | Yes |
| 2FA support | Yes | Yes | Yes | Yes | Yes |
| Passkey support | Yes | Yes | Yes | Yes | Yes |
| Open source | No | Yes | No | No | No |
| Japanese support | Yes | Yes | Partial | Partial | Yes |
For value, choose Bitwarden (the most generous free plan). For overall quality, choose 1Password (best balance of UI, features, and security).
1Password — The Best All-Around Password Manager
Rating: 5/5 stars
1Password is the gold standard of password managers. Since its 2006 launch, over 15 million users worldwide rely on it daily.
1Password Strengths
- Intuitive UI: Polished design that beginners can navigate easily
- Watchtower: Real-time detection of compromised and weak passwords
- Travel Mode: Hide specific vaults when crossing international borders
- Browser integration: Exceptionally accurate auto-fill
- Passkey management: Industry-leading support for next-gen authentication
1Password Caveats
- No free plan: Only a 14-day free trial
- $2.99/month: Slightly higher than competitors (but justified by features)
Best For
- First-time password manager users
- People who prioritize UI polish
- Apple ecosystem users (macOS/iOS integration is excellent)
Bitwarden — The Free, Open-Source Powerhouse
Rating: 5/5 stars
Bitwarden is the only major open-source password manager. Its free plan is the most generous in the industry — the top choice for budget-conscious users.
Bitwarden Strengths
- Excellent free plan: Unlimited passwords and devices at no cost
- Open source: Source code is publicly available for third-party security verification
- Self-hosting option: Run your own server for complete data control (advanced users)
- Affordable paid plan: Just $0.83/month ($10/year) for all premium features
Bitwarden Caveats
- Utilitarian UI: Less polished than 1Password or Dashlane
- Auto-fill quirks: Some sites may not trigger auto-fill correctly
Best For
- Anyone wanting free password management
- Open-source software advocates
- Tech-savvy users interested in self-hosting
LastPass — The Well-Known Veteran
Rating: 3/5 stars
LastPass once dominated thanks to its generous free plan. However, recent security incidents and free plan restrictions have divided opinion.
LastPass Strengths
- Long track record: Serving users since 2008
- Browser extension quality: Compatible with all major browsers
- Emergency access: Grant trusted contacts access to your account
LastPass Caveats
- Past security incidents: In 2022, encrypted vault data was breached. Security has since been overhauled, but trust recovery is ongoing
- Free plan restrictions: Limited to one device type (PC or mobile, not both)
Best For
- Existing users who find migration inconvenient
- Users who primarily work in a browser
Dashlane — The Feature-Rich Option with Built-In VPN
Rating: 4/5 stars
Dashlane is a multi-feature app that bundles VPN functionality alongside password management. Ideal for those who want comprehensive security in one app.
Dashlane Strengths
- Built-in VPN: Paid plans include a VPN (powered by Hotspot Shield)
- Dark web monitoring: Checks if your personal information has been exposed
- Password health score: Visualizes your overall password strength
- Family plan: Supports up to 10 users (industry-leading capacity)
Dashlane Caveats
- Higher price: $4.99/month is the most expensive of the five
- Incomplete localization: Some UI elements remain in English only
Best For
- Anyone wanting password management and VPN in one package
- People interested in dark web monitoring
- Large families (up to 10-person plan)
Learn more about VPNs: VPN Comparison Guide
NordPass — The Rising Star from NordVPN
Rating: 4/5 stars
NordPass is a password manager from Nord Security, the company behind NordVPN. Released in 2019, it’s relatively new but rapidly gaining market share thanks to strong security and competitive pricing.
NordPass Strengths
- XChaCha20 encryption: Next-generation encryption surpassing AES-256
- Competitive pricing: Premium features for just $1.49/month
- Email masking: Hide your email address for enhanced privacy
- Nord product bundles: Discounts when combined with NordVPN and NordLocker
NordPass Caveats
- Browser extension stability: Slightly less reliable than 1Password or Bitwarden
- Short history: Less proven track record since 2019 launch
Best For
- Existing NordVPN users
- Those interested in cutting-edge encryption
- Value-conscious buyers
Best Password Manager by Use Case
Personal Use (First-Time User)
Recommended: Bitwarden (free) → upgrade to 1Password later
Start with Bitwarden’s free plan — unlimited devices, unlimited passwords, covering all the basics. When you want a more polished UI and advanced features, consider switching to 1Password.
Family Sharing
Recommended: 1Password Family Plan ($4.99/month for 5 users)
For secure family password sharing, 1Password’s family plan is ideal. Create shared vaults for Wi-Fi passwords and streaming logins while keeping personal vaults private.
Team & Business Use
Recommended: 1Password Business ($7.99/user/month)
To centralize team password management, 1Password Business is the best fit. The admin dashboard provides full visibility into team security, and onboarding/offboarding is streamlined.
For broader security considerations, also check our Cloud Storage Security Comparison.
Frequently Asked Questions (FAQ)
Q: Isn’t browser password saving good enough?
A: Chrome and Safari have built-in password saving, but dedicated apps are superior in security and features. Browser-based storage is hard to share across browsers and lacks robust strength checks and breach notifications. For serious security improvement, a dedicated password manager is the way to go.
Q: What if I forget my master password?
A: With zero-knowledge architecture, the provider cannot reset your master password. 1Password issues an “Emergency Kit” — a recovery sheet you should print and store in a safe place.
Q: What if the password manager itself gets hacked?
A: Zero-knowledge encryption means even if servers are breached, only encrypted data is exposed. Without the master password, decryption is practically impossible. The caveat: your master password must be strong.
Q: Are free apps secure enough?
A: Bitwarden’s free plan matches paid apps in security. As an open-source tool with AES-256 encryption and zero-knowledge architecture, there are no security compromises — even at no cost.
Conclusion: Finding Your Perfect Password Manager
Each app in one sentence:
- 1Password → Best overall. Top marks for UI, features, and security. The go-to choice when in doubt
- Bitwarden → Best free option. Open-source, transparent, and cost-effective
- LastPass → Established but rebuilding trust. A viable option if past incidents don’t concern you
- Dashlane → Feature-rich with VPN. For those who want unified security
- NordPass → Rising value player. Great bundle discounts for NordVPN users
If you’re unsure, start with Bitwarden’s free plan. Once you appreciate the convenience of password management, consider upgrading to 1Password for its premium experience.
For those looking to strengthen online security beyond passwords, consider adding a VPN to your toolkit.
Related Articles
- VPN Comparison Guide 2026
- Cloud Storage Comparison 2026: Free Storage & Pricing
- Best 15 AI Tools for 2026: Boost Your Productivity by 3x
Pricing and plan details in this article reflect information available as of March 2026. Please check each service’s official website for the latest details. This article contains affiliate links.
よくある質問(FAQ)
Are password managers really safe?
Yes, well-designed password managers are extremely safe. They use military-grade encryption such as AES-256 or xChaCha20, and your master password is never stored on their servers. Using a password manager is far safer than reusing passwords.
What's the best free password manager?
Bitwarden is our top recommendation. It's open-source with high transparency, and the free plan includes unlimited passwords and multi-device sync.
What happens if I forget my master password?
With most password managers, forgetting your master password means losing access to your data. 1Password provides a Recovery Key that can be saved in advance for account recovery. Always store your backup in a safe location.
Products & Services in This Article
1Password
関連記事
AI会計ソフト比較|freee・マネーフォワード・弥生の自動仕訳精度
freee会計・マネーフォワードクラウド会計・弥生会計のAI自動仕訳精度を徹底比較。料金・使いやすさ・税理士連携など中小企業・個人事業主向けに解説します。
AI搭載CRM比較|Salesforce・HubSpot・Zohoどれを選ぶ?
Salesforce Einstein・HubSpot AI・Zoho CRM AIの3大CRMをAI機能・料金・使いやすさで徹底比較。企業規模別・業種別の最適なCRM選定ガイドです。
【2026年版】AIデザインツール比較|Canva・Figma・Adobe Firefly
Canva AI・Figma AI・Adobe Fireflyを徹底比較。デザイン初心者からプロまで、用途別の最適なAIデザインツールを選べる完全ガイドです。