App Overview

Encrypted Email - Proton Mail icon

Encrypted Email - Proton Mail

Proton AG · Productivity

Proton Mail is the encrypted email app trusted by over 100 million people

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
50,231 ratings · Top 5%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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Build Kit

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A product spec, screen plans, and build steps for your coding agent.

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What's included18 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
Preview a sample Build Kit No email needed

Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Encrypted Email - Proton Mail: map the core Productivity workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

Screenshots

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App Store description

Proton Mail is the encrypted email app trusted by over 100 million people. Get a secure, private email address protected by end-to-end encryption, with no ads, no AI training and no inbox scanning. Based in Switzerland and protected by some of the world's strictest privacy laws. Your inbox, your rules. Why choose Proton Mail for secure email • Free encrypted email: create a free @proton.me or @protonmail.com email address • Password-protected emails: send encrypted emails to anyone, even people who don't use Proton • Spam, phishing and tracker protection: with built-in spam filters, phishing alerts and email tracker blocking • Organize your inbox: with folders, labels and simple swipe gestures • Offline mode: read, write and organize emails offline, and everything syncs when you're back online • Private categories: keep important emails in focus with automatic, private categories • Multiple accounts: switch between multiple Proton Mail accounts in one secure email app • Get up to 1 GB of free email storage, or up to 15 GB with Mail Plus Secure email with encryption Everything in your inbox is stored with zero-access and end-to-end encryption, emails between Proton users can only be read by you and your recipient. Proton Mail can't read or scan your messages. Our open-source apps use OpenPGP encryption and are independently audited. A private alternative to temp mail Need a temp mail address for a sign-up? Create up to 10 free hide-my-email aliases on the web. They forward to your inbox, keep your real email address private, and can be disabled or deleted at any time. Switch to secure email Easy Switch moves your email to your new secure inbox with no manual exporting or importing. Connect Gmail to use your Gmail address alongside your Proton email in one secure inbox, or set up auto-forwarding from as many Gmail accounts as you like. The Wall Street Journal: "Proton Mail offers encrypted email, which makes it virtually impossible for anyone to read it except the sender and the recipient." How can Proton Mail be free? We believe everyone deserves private email. Free accounts are funded by our community of paid subscribers. Upgrade for more email storage, more addresses and custom domains. Follow Proton for the latest news and offers: Facebook: /proton X: @protonprivacy Reddit: /protonmail Instagram: /protonprivacy Learn more: https://proton.me/mail Our open-source code: https://github.com/ProtonMail

Written user reviews are not shown here. Check current App Store reviews >

Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Implement advanced filtering and sorting features.

Assumption to check: Email sorting and filtering options are limited.

Validate with people who use this workflow before building.

Hypothesis 2

Optimize search algorithms and provide suggestions.

Assumption to check: Search functionality can be slow and inaccurate.

Validate with people who use this workflow before building.

Hypothesis 3

Add tags and groups for better contact organization.

Assumption to check: Limited contact management features.

Validate with people who use this workflow before building.

Hypothesis 4

Simplify UI elements and improve layout.

Assumption to check: User interface can be cluttered.

Validate with people who use this workflow before building.

Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

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BUILD KIT DIFFICULTY
Advanced

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.