How much does Winmail.dat, MSG, MHT Viewer make per month?

Based on our ML-calibrated revenue forecast, Winmail.dat, MSG, MHT Viewer earns approximately $847/mo. This is a US-storefront-equivalent estimate; global revenue can be several times larger for internationally-distributed apps. See the methodology page for the full formula and confidence bands.

What apps are like Winmail.dat, MSG, MHT Viewer?

Browse the full Productivity category catalog to find similar apps with revenue, build cost, audience and tech stack data. Each /p/{slug} page also shows a Compare side-by-side widget with three peer apps from the same niche.

Who makes Winmail.dat, MSG, MHT Viewer?

Winmail.dat, MSG, MHT Viewer is published by Letter Opener GmbH on the Google Play Store. See the full publisher portfolio (other apps by the same developer) via the More by developer block on the product page above.

What is Winmail.dat, MSG, MHT Viewer's BU Score?

Winmail.dat, MSG, MHT Viewer has a BU Score of 61/100 (Solid). The score combines App Store rating, ratings count, monetization model and revenue signals calibrated against founder-verified MRR anchors. See the BU Score formula.

Winmail.dat, MSG, MHT Viewer

Quality Score

Solid

Winmail.dat, MSG, MHT Viewer

Name: Winmail.dat, MSG, MHT Viewer — app revenue, audience, build cost & risk profile
Creator: GetAppValue
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Winmail.dat, MSG, MHT Viewer revenue, Winmail.dat, MSG, MHT Viewer app analytics, mobile app revenue estimate, Productivity revenue, Android app revenue

by Letter Opener GmbH

High confidence

3.9 Google Play rating

✍️ GetAppValue analysis

“

Winmail.dat, MSG, MHT Viewer is an Android app from Letter Opener GmbH in the Productivity category, currently rated 3.9★ across 17,019 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.

Quality Score is 61: Solid (established niche player). For a Productivity app, that means established niche player. The full BU Investment Matrix below scores 8 dimensions including monetisation, growth, and operational risk.

Track changes month-over-month in the Performance section below: live snapshot history and revenue forecast included.

💰 Monthly revenue · now vs forecast

● Right now

$5.0K

per month

→

12-mo forecast

$5.2K – $10.8K

per month

→

24-mo forecast

$6.4K – $19.2K

per month

MID tier

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Description hook & conversion structure
Screenshots, ratings, reviews strategy

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Typical impact: +2-5× organic installs

📊 Performance Tracking LIVE

Loading…

idle

Rating

—

Reviews

—

Forecast Revenue / mo

—

Snapshots tracked

since first record

ONE-TIME · BUILD 💰 Estimated build cost

$85K

↳ What it cost to build · not monthly revenue

Likely range $65K – $115K

$25K · MVP floor $100K · indie scale $500K+ · studio build

📈 Slow ROI — current MRR is well below build cost

Synthetic estimate. Inputs: category complexity, file size, screen count, monetization layer, platform reach, age × team-size proxy. Calibrated against 2024-2026 indie-agency rate surveys. Full math + source list on /methodology.

Where the money goes

🧱 MVP baseline (design + 1-store ship)	+$28K
📱 5 unique screens × $4.5K	+$22K
⚙ Productivity complexity ×1.10	+$5K
🌐 Cross-platform reach (iOS + Android)	+$30K

Total estimate $85K

ONE-TIME · EXIT VALUE 💵 Estimated acquisition value

$15K

↳ What it would sell for · not monthly revenue

Marketplace range $10K – $15K · 15× MRR multiple

💸 ~0.2× build cost (under-water)

Synthetic estimate. Multiple band derived from ad-supported + age, rating quality, category demand, and user-base maturity. Calibrated against 2024-2026 indie-app-marketplace closed-deal medians. Full math + comparable deal list on /methodology.

How the multiple was built

📺 Ad-supported base	15× MRR
⭐ ★ rating 3.5-4.0 (mixed)	-8%
🏷 Productivity category multiple	+8%

Final multiple 15× MRR

👥 Estimated audience size

1.2M

Lifetime downloads (US-equivalent)

Monthly active

375K

Daily active

165K

Synthetic estimate from ratings × category benchmarks. Calibrated against 2024-2026 mobile-attribution retention + DAU/MAU reports. Numbers are US-storefront-equivalent — true global audience can be 5-10× larger for international apps. Full math + source list on /methodology.

How we sized it

📲 Productivity engagement	~75 installs / rating
🔁 Productivity D30 retention	30%
📍 DAU / MAU stickiness	0.45

DAU / MAU 44% sticky

🔬

How we forecast this revenue

MEDIUM CONFIDENCE

Baseline

$5.0K/mo · ML-estimated from 234 triggers

Growth rate

+4.0% MoM · MID tier baseline (compound monthly)

6 months

$4.7K – $7.9K

12 months

$5.2K – $10.8K

24 months

$6.4K – $19.2K

Compound growth at +4.0% MoM (tier baseline for MID). Range widens with horizon — typical noise band ±25% at 6mo.. Ranges widen with horizon — distant futures carry more uncertainty.

📊

BU Investment Matrix

Stalled · 40/100MID TIERno growth momentum

Growth Velocity

5.0

Founder Strength

3.4

Product Quality

7.9

Revenue Strength

3.7

Monetization Maturity

1.0

Defensibility

3.6

Market Position

0.0

Operational Safety

7.0

💰 Revenue: Modest — $3K - $7K/mo · MID tier · medium confidence, trajectory unclear.
⭐ Quality: 3.94★ across 17,019 reviews — strong (top 10%).
📍 Market: Not yet charting in any of the 9 monitored markets.
📈 Growth: ⚠ last update 514d ago — possibly dormant.
⚠️ Risk: Moderate — dormant (514d since update).

🎯 For competitors: Mixed picture. Worth competing if you have a clear UX or pricing edge — otherwise crowded segment.

💵 For acquirers: Estimated asking range 18-32× monthly = $90K-$160K.

Composite of 8 dimensions computed deterministically from public signals — no LLM, every score traces back to a measurable input. Default weights shown; "compete" / "acquire" / "invest" lenses re-weight without re-fetching.

Range:

💰 Forecast Revenue / mo

MODEL

Revenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.

🔬Forecast Breakdown — Why This Estimate?Top 6 of 6 triggers

Our ML model uses 200+ signals from public data. These are the most influential for this app:

Mid install base (17,019 ratings)METRIC		+$5,500
securityREVIEW		+$1,800
excellent appREVIEW		+$1,500
slowREVIEW		−$1,200
Established app (6y old)METRIC		+$800
Ad-supported / freemiumMETRIC		+$600

METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)

📥 Estimated Downloads / week

PROXY · ratings × 50/wk —

Industry-rule estimate (Sensor Tower / data.ai): one weekly install ≈ 50 new ratings. Solid points = tracked snapshots · faded line = pre-tracking model backfill.

📈 Reviews Growth

LIVE

Cumulative review count from first BU snapshot. Each point = a tracked update.

⭐ Rating Trend

LIVE

Average rating evolution. Updates with each new review batch.

🗓️ Snapshot Timeline

HISTORY

Each bar shows a tracked update and the metric delta from the previous snapshot.

Profile & Insights

Everything we know — and don't — about this app and its company.

Identification

App name: Winmail.dat, MSG, MHT Viewer
Developer: Letter Opener GmbH
Bundle ID: app.letteropener
App Store URL: Open in App Store
Category: Productivity
Content rating: Not found
Languages: Not found

Company

Website: winmail.help
Tagline: Not found
Description: Not found
Founded: Not found
HQ / Address: Not found
Employees: Not found
Logo: Not found

Revenue

Reported revenue signal / mo: Not found
AI revenue estimate / mo: Not found
AI annual estimate: Not found
ML model estimate / mo: $235/mo
Top-grossing rank: Not found
All-time revenue: Not found
Pricing: Not found

Founder

Founder data not yet collected for this app.

Funding

Funding data not yet collected for this app.

Press & Links

Press & Links data not yet collected for this app.

Contacts & Socials

Contacts & Socials data not yet collected for this app.

Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.

📝 About this app

<h2><b>Open 📎 Winmail.dat, MSG, EML and MHT files easily and securely</b></h2> Letter Opener has always been the perfect app to open <b>Winmail.dat</b> and <b>MSG</b> e-mail files—the format used by Microsoft Outlook and Exchange—and also internet standard <b>EML</b> email files. And it’s even easier and more secure with Letter Opener for Android. Your files are never transferred or shared when you use Letter Opener, and your files and content stays protected on your device.… View full description on the official store →

App Specs

🔐 Own this app? Claim & verify MRR →

🔖 v2.3.0🔄 updated 0d ago📂 Productivity💰 Free

🧪

Tech & Domain Intel — winmail.help

Mail provider: Google Workspace
Tech stack: Apple Pay / Sign in with Apple · Google Workspace

Derived from public RDAP + DNS TXT records (no scraping, no login).

🔔

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📝 Description

BU Score · Transcendent

Full revenue analysis

Read the article-style breakdown for Winmail.dat, MSG, MHT Viewer: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.

Read deep-dive →