63
Quality Score
Solid
Plank - 21 Day Challenge
✍️ bumetric analysis
“
Plank - 21 Day Challenge is an Android app from Fit apps in the Health & Fitness category, currently rated 4.5★ across 3,070 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Quality Score is 63: Solid (established niche player). For a Health & Fitness 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.
💰 Revenue · today and ahead
Today
$5.0K/mo
In 12 months
$5.2K – $10.8K
In 24 months
$6.4K – $19.2K
MID 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
Typical impact: +2-5× organic installs
📊 Performance Tracking LIVE
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Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
ONE-TIME · BUILD💰 Estimated build cost
$175K
↳ What it cost to build · not monthly revenue
Likely range $130K – $235K
$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 |
| 💎In-app purchase plumbing | +$9K |
| ⚙Health & Fitness complexity ×1.40 | +$23K |
| 🌐Cross-platform reach (iOS + Android) | +$45K |
| ⚙7.2y maintenance × ~1-person team | +$43K |
Total estimate$175K
ONE-TIME · EXIT VALUE💵 Estimated acquisition value
$25K
↳ What it would sell for · not monthly revenue
Marketplace range $20K – $35K · 40× MRR multiple
💸~0.1× build cost (under-water)
Synthetic estimate. Multiple band derived from iap / freemium model + 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
| 💎IAP / freemium model base | 28× MRR |
| 📅7.2y proven track record | +20% |
| ⭐★ rating ≥ 4.4 (solid) | +8% |
| 🏷Health & Fitness category multiple | +10% |
Final multiple40× MRR
👥 Estimated audience size
150K
Lifetime downloads (US-equivalent)
Monthly active
22K
Daily active
7.8K
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
| 📲Health & Fitness engagement | ~70 installs / rating |
| 📅7.2y of rating accumulation | -30% |
| 🔁Health & Fitness D30 retention | 22% |
| 📍DAU / MAU stickiness | 0.35 |
DAU / MAU35% sticky
🛠 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 | Health & Fitness |
| 📦Compact Android bundle | → Native Kotlin |
💀 Maintenance status
Likely abandoned
88%
Last shipped 2020-01-10 · 2325 days ago
0 · Active50 · At risk100 · 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
| 📅6y+ since last update | Likely abandoned |
VerdictLikely abandoned
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$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
Building · 56/100MID TIERcompetitive build-outGrowth Velocity
5.0
Founder Strength
6.4
Product Quality
8.1
Revenue Strength
3.7
Monetization Maturity
5.0
Defensibility
9.3
Market Position
0.0
Operational Safety
7.0
- 💰 Revenue: Modest — $3K - $7K/mo · MID tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.52★ across 3,070 reviews — strong (top 10%).
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: ⚠ last update 2323d ago — possibly dormant.
- ⚠️ Risk: Moderate — dormant (2323d since update).
🎯 For competitors: Strong subscription moat. Hard to outcompete on retention. Better angle: free alternative with one-time purchase, or feature parity for an underserved sub-niche.
💵 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
MODELRevenue 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:
| Excellent rating (4.5★)METRIC | +$2,200 | |
| Low install base (3,070 ratings)METRIC | +$1,500 | |
| Established app (7y old)METRIC | +$800 | |
| Ad-supported / freemiumMETRIC | +$600 |
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)
📈 Reviews Growth
LIVECumulative review count from first BU snapshot. Each point = a tracked update.
⭐ Rating Trend
LIVEAverage rating evolution. Updates with each new review batch.
App Specs
🔐 Own this app? Claim & verify MRR →🔖 v1.0.3.0🔄 updated 6y ago📂 Health & Fitness💰 Free📺 Ad-supported💎 IAP $2.99 per item🚀 Launched 2019 (7y old)
📝 About this app
The 21-day plank app for men and women is designed to strengthen and train the abs, core muscles, as well as burning belly fat and losing weight.
Exercise plank is the best exercise for the abdominals, and with our app the plank for 21 days, you can train your abs muscles and reduce weight.
If you want to train your abs at home - then this plank counter will be one of the best, as it is suitable for home fitness workouts.
You can also use the exercise bar for weight loss and for weight loss.… View full description on the official store →
Exercise plank is the best exercise for the abdominals, and with our app the plank for 21 days, you can train your abs muscles and reduce weight.
If you want to train your abs at home - then this plank counter will be one of the best, as it is suitable for home fitness workouts.
You can also use the exercise bar for weight loss and for weight loss.… View full description on the official store →
🧪
Tech & Domain Intel — fit-apps.com
- Mail provider
- Yandex Mail
Derived from public RDAP + DNS TXT records (no scraping, no login).
🔔
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Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Plank - 21 Day Challenge
- Developer
- Fit apps
- Bundle ID
- plank.challenge.workout.exercise.plank
- App Store URL
- Open in App Store
- Category
- Health & Fitness
- Content rating
- Not found
- Languages
- Not found
Company
- Website
- fit-apps.com
- Tagline
- Not found
- Description
- Not found
- Founded
- Not found
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- Not found
Revenue
- Verified revenue / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- ML model estimate / mo
- $650/mo
- Top-grossing rank
- Not found
- All-time revenue
- Not found
- Pricing
- $2.99 per item
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.
📈Ratings growth3,070 ratings+49% lifetimeShow 3-year history estimate ▾
Tracked (1 weeks) Pre-tracking estimate (36 weeks) · model-based, ±5% noise · anchored to release date and current value
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.
More by Fit apps
View all →📦 Portfolio summaryINDIE studio
6apps·$7K/mocombined
✓ Diversified — top app contributes 24%; risk spread across portfolio
Full revenue analysis
Read the article-style breakdown for Plank - 21 Day Challenge: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
❓ Frequently Asked Questions
10 answers · auto-generated from this app's public dataHow much does Plank - 21 Day Challenge make per month?▾
Based on our ML-calibrated revenue forecast, Plank - 21 Day Challenge earns approximately $649/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 Plank - 21 Day Challenge profitable?▾
With estimated build cost $175K and monthly revenue $649, Plank - 21 Day Challenge 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.
How many users does Plank - 21 Day Challenge have?▾
Estimated audience: ~150K lifetime downloads, ~22K monthly active users, and ~7K daily active users. Derived from ratings count × category installs-per-rating × age decay. US-storefront-equivalent — global audience can be 5-10× larger for internationally-distributed apps.
What apps are like Plank - 21 Day Challenge?▾
Browse the full Health & Fitness 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 Plank - 21 Day Challenge built with?▾
Our heuristic places Plank - 21 Day Challenge 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 Plank - 21 Day Challenge still actively maintained?▾
Maintenance status: Likely abandoned (88% abandonment risk). Last shipped version was 6+ years ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.
How much would Plank - 21 Day Challenge sell for?▾
Estimated acquisition value: $25K (marketplace range $20K – $35K). Calculated as 40× monthly revenue using the standard multiple for the detected monetization model + adjustments for age, rating quality and category demand. Calibrated against 2024-2026 Flippa / Acquire.com / MicroAcquire closed-deal medians.
When was Plank - 21 Day Challenge last updated?▾
Plank - 21 Day Challenge last shipped a new version on 2020-01-10 — more than 6 year(s) ago. This is the date Apple / Google last accepted a new build, not a content-only push.
Who makes Plank - 21 Day Challenge?▾
Plank - 21 Day Challenge is published by Fit apps 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 Plank - 21 Day Challenge's BU Score?▾
Plank - 21 Day Challenge has a BU Score of 63/100 (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.