A single security failure can destroy customer trust and lead to legal trouble. The good news: most breaches come from basic mistakes that a checklist can prevent. Use this one before you launch.
Authentication and access
- Use strong login: one-time passwords, strong passwords or trusted sign-in options, plus optional two-factor authentication for sensitive actions.
- Protect sessions: short-lived tokens, secure refresh and logout that really clears access.
- Apply least privilege: users, staff and the app itself get only the permissions they need.
- Add biometric unlock where appropriate, with a safe fallback.
Data protection
- Encrypt data in transit with HTTPS/TLS everywhere.
- Encrypt sensitive data at rest and use the phone’s secure storage for tokens and keys.
- Never hard-code secrets (API keys, passwords) inside the app; anything shipped can be extracted.
- Collect only what you need and delete data you no longer require.
- Avoid logging sensitive data in logs, crash reports or analytics.
APIs and the back end
- Validate everything on the server. Never trust the app to enforce rules such as prices or permissions.
- Authenticate and authorise every API request, and limit request rates.
- Protect against common attacks such as injection and broken access control; see the OWASP lists.
Code, dependencies and release
- Keep libraries updated and remove unused ones; outdated packages are a common entry point.
- Test before release: automated scans, manual review of risky flows (login, payments) and, for high-risk apps, an independent penetration test.
- Prepare for incidents: monitoring, alerts, a way to force an update and a plan for informing users.
Privacy and compliance
- Publish a clear privacy policy and ask for permissions only when needed, explaining why.
- India’s data-protection law and sector rules affect how personal data must be handled — get professional advice for health and financial apps.
- Follow store policies for data disclosure.
Special cases
- Payments: use certified payment providers instead of handling card data yourself.
- Health apps: apply strict access control, audit logs and consent — see how to build a telemedicine app.
- Real-time and location apps: protect location data and let users control sharing — see cab booking apps.
Keep security going after launch
Schedule dependency updates, review logs, patch vulnerabilities quickly and re-test after major changes. Budget for it — see the app cost guide for maintenance costs.
Build apps with security in mind
Security is cheaper when it is designed in from the start. Explore our mobile app development service, read how to make a mobile app or get a free quote.
