How much does Warbler Guide App make per month?

Based on our ML-calibrated revenue forecast, Warbler Guide App earns approximately $200/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.

Is Warbler Guide App profitable?

With estimated build cost $135K and monthly revenue $200, Warbler Guide App looks well below break-even — current monthly revenue is much smaller than the estimated build cost. Profitability also depends on paid-acquisition spend and refund rate which the public model doesn't see.

What apps are like Warbler Guide App?

Browse the full Books & Reference 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.

What is Warbler Guide App built with?

Our heuristic places Warbler Guide App on the Native Android (Kotlin) stack (High confidence, 80%). Signals: app bundle size, category context, store-description markers, release-date era. We don't disassemble binaries. Alternative possibilities: Flutter.

Is Warbler Guide App still actively maintained?

Maintenance status: At risk (60% abandonment risk). Last shipped version was 11 months ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.

When was Warbler Guide App last updated?

Warbler Guide App last shipped a new version on 2025-11-16 — 11 months ago. This is the date Apple / Google last accepted a new build, not a content-only push.

Who makes Warbler Guide App?

Warbler Guide App is published by Princeton University Press - Warblers 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 Warbler Guide App's BU Score?

Warbler Guide App has a BU Score of 42/100 (Emerging). The score combines App Store rating, ratings count, monetization model and revenue signals calibrated against founder-verified MRR anchors. See the BU Score formula.

Warbler Guide App

Quality Score

Emerging

Warbler Guide App

Name: Warbler Guide App — app revenue, audience, build cost & risk profile
Creator: Bumetric
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Warbler Guide App revenue, Warbler Guide App app analytics, mobile app revenue estimate, Books & Reference revenue, Android app revenue

by Princeton University Press - Warblers

Low confidence

2.7 Google Play rating

✍️ Bumetric analysis

“

Warbler Guide App is an Android app from Princeton University Press - Warblers in the Books & Reference category, currently rated 2.7★ across 78 ratings. Initial signal reads as mixed reviews: supporters praise core features while critics cite stability and value gaps.

Quality Score is 42: Emerging (early traction worth watching). For a Books & Reference app, that means early traction worth watching. 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

$200

per month

→

12-mo forecast

$100 – $931

per month

→

24-mo forecast

$100 – $2790

per month

MICRO tier

💡 Grow this revenue

Free AI audit of this app’s store listing

Title & subtitle keyword fit
Description hook & conversion structure
Screenshots, ratings, reviews strategy

Run free AI audit →

Typical impact: +2-5× organic installs

📊 Performance Tracking LIVE

1 snapshots on record

idle

Rating

2.7

Reviews

78 reviews

Forecast Revenue / mo

$200

Snapshots tracked

since Sep 2026

ONE-TIME · BUILD 💰 Estimated build cost

$135K

↳ What it cost to build · not monthly revenue

Likely range $100K – $180K

$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
⚙ Books & Reference complexity ×0.95	$-2525
🌐 Cross-platform reach (iOS + Android)	+$26K
⚙ 9.7y maintenance × ~1-person team	+$58K

Total estimate $135K

🛠 Estimated tech stack

🤖

Native Android (Kotlin)

High confidence · 80%

Also possible

Flutter

Heuristic guess from app bundle size, category, store description signals, and release-date stack era. Bumetric does not disassemble binaries — for binary-level certainty you would need an SDK intelligence tool or the manifest itself. Reasoning chain on the right. Full ruleset on /methodology.

Signals we read

🏷 Category context	Books & Reference
📦 Compact Android bundle	→ Native Kotlin

💀 Maintenance status

At risk

60%

Last shipped 2025-11-16 · 332 days ago

0 · Active 50 · At risk 100 · Abandoned

Heuristic risk score from time-since-last-update + ratings velocity proxy + Editor's Choice / curated featuring signals. Calibrated against 2024-2025 app-store ranking decay reports. Not a guarantee — a quiet app with a healthy codebase looks the same as an abandoned one until something breaks. Full math on /methodology.

Risk signals

📅 11 months since last update	Concerning gap
👥 Small user base (78 ratings) + 9.7y old	+10% (solo-project pattern)

Verdict At risk

🔬

How we forecast this revenue

LOW CONFIDENCE

Baseline

$200/mo · ML-estimated from 234 triggers

Growth rate

+8.0% MoM · MICRO tier baseline (compound monthly)

Direction

Headwinds: rating drift may slow acquisition

6 months

$127 – $508

12 months

$100 – $931

24 months

$100 – $2.8K

Compound growth at +8.0% MoM (tier baseline for MICRO). Range widens with horizon — typical noise band ±60% at 6mo.. Ranges widen with horizon — distant futures carry more uncertainty.

📊

BU Investment Matrix

Insufficient data · 31/100MICRO TIERtoo early to score

Growth Velocity

5.0

Founder Strength

3.2

Product Quality

2.2

Revenue Strength

2.3

Monetization Maturity

1.0

Defensibility

4.4

Market Position

0.0

Operational Safety

7.0

💰 Revenue: Marginal — $0 - $500/mo · MICRO tier · indicative confidence, trajectory unclear.
⭐ Quality: 2.74★ across 78 reviews — weak — significant quality concerns.
📍 Market: Not yet charting in any of the 9 monitored markets.
📈 Growth: last update 332d ago — slow cadence.
⚠️ Risk: Moderate — no material risk signals detected.

🎯 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 = $3K-$6K.

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 4 of 4 triggers

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

Paid app ($12.99)METRIC		+$2,800
Below-average rating (2.7★)METRIC		−$1,500
Mature app (9y old)METRIC		+$1,500
Pre-traction phase (78 ratings)METRIC		−$300

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: Warbler Guide App
Developer: Princeton University Press - Warblers
Bundle ID: com.warbler.android
App Store URL: Open in App Store
Category: Books & Reference
Content rating: Not found
Languages: Not found

Company

Website: press.princeton.edu
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
Model estimate / mo: $200/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

Warbler Guide App

Tom Stephenson & Scott Whittle

The Warbler Guide App is the perfect companion to Princeton’s revolutionary and widely acclaimed book The Warbler Guide, by Tom Stephenson and Scott Whittle. Whether for study or field use, this innovative app delivers the full power of The Warbler Guide in your pocket—plus unique new app-only features. 

The app allows you to identify birds by view or song, quickly and intuitively. Exciting new 3D graphics enable you to view a bird from the exact angle you see it in the field.… View full description on the official store →

App Specs

🔐 Own this app? Claim & verify MRR →

🔖 v1.1.79🔄 updated 11mo ago📂 Books & Reference💰 Free🚀 Launched 2017 (9y old)

🧪