Diary Book - Journal With Lock
61
Quality Score
Solid
Diary Book - Journal With Lock
Medium confidence
✍️ bumetric analysis
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Diary Book - Journal With Lock is an Android app from Lucidify Labs in the Lifestyle category, currently rated 4.3★ across 4,871 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Quality Score is 61: Solid (established niche player). For a Lifestyle 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
$831
per month
→
12-mo forecast
$727 – $2619
per month
→
24-mo forecast
$673 – $6060
per month
INDIE 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
Loading…
Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
ONE-TIME · BUILD
💰 Estimated build cost
$95K
↳ What it cost to build · not monthly revenue
Likely range $70K – $130K
$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 |
| ⚙ Lifestyle complexity ×1.05 | +$2K |
| 🌐 Cross-platform reach (iOS + Android) | +$34K |
Total estimate
$95K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$25K
↳ What it would sell for · not monthly revenue
Marketplace range $15K – $30K · 28× MRR multiple
💸
~0.3× 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 |
Final multiple
28× MRR
👥 Estimated audience size
535K
Lifetime downloads (US-equivalent)
Monthly active
69K
Daily active
13K
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
| 📲 Lifestyle engagement | ~110 installs / rating |
| 🔁 Lifestyle D30 retention | 13% |
| 📍 DAU / MAU stickiness | 0.20 |
DAU / MAU
19% sticky
🔬
How we forecast this revenue
LOW CONFIDENCEBaseline
$831/mo · ML-estimated from 234 triggers
Growth rate
+6.0% MoM · INDIE tier baseline (compound monthly)
6 months
$708 – $1.7K
12 months
$727 – $2.6K
24 months
$673 – $6.1K
Compound growth at +6.0% MoM (tier baseline for INDIE). Range widens with horizon — typical noise band ±40% at 6mo.. Ranges widen with horizon — distant futures carry more uncertainty.
📊
BU Investment Matrix
Early-stage solo · 43/100INDIE TIERexpected for tierGrowth Velocity
5.0
Founder Strength
4.1
Product Quality
7.9
Revenue Strength
2.9
Monetization Maturity
1.0
Defensibility
3.5
Market Position
0.0
Operational Safety
10.0
- 💰 Revenue: Marginal — $332 - $2078/mo · INDIE tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.4★ across 4,225 reviews — strong (top 10%).
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: Insufficient signal to assess trajectory.
- ⚠️ Risk: Low — 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 = $14K-$26K.
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:
| Low install base (4,871 ratings)METRIC | +$1,500 | |
| Mature app (9y old)METRIC | +$1,500 | |
| Good rating (4.3★)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.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Diary Book - Journal With Lock
- Developer
- Lucidify Labs
- Bundle ID
- in.lucidify.dairybook
- App Store URL
- Open in App Store
- Category
- Lifestyle
- Content rating
- Not found
- Languages
- Not found
Company
- Website
- diarybook.me
- 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
- $831/mo
- Top-grossing rank
- Not found
- All-time revenue
- Not found
- Pricing
- $4.99 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 growth4,871 ratings+18% lifetimeShow 3-year history estimate ▾
Tracked (1 weeks) Pre-tracking estimate (37 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.
📝 About this app
<b>Diary Book - With Lock</b> is a passcode protected, simple yet feature rich, free journal app. With multiple themes, rich text options and different font styles, customize your diary with your own taste. Keep your memories safe in the journal with Google Drive and local backup options.
<u>With over <b>100,000+ downloads</b>, Diary Book is one of the most loved diary apps on Play Store.</u>
<b> Top Features </b>
🔒 <b>In Built App Lock - Fingerprint, Pattern, Pin and Password</b>:
Safeguard your diary with the inbuild lock settings.… View full description on the official store →
<u>With over <b>100,000+ downloads</b>, Diary Book is one of the most loved diary apps on Play Store.</u>
<b> Top Features </b>
🔒 <b>In Built App Lock - Fingerprint, Pattern, Pin and Password</b>:
Safeguard your diary with the inbuild lock settings.… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →🔖 v5.0.0🔄 updated 0d ago📂 Lifestyle💰 Free📺 Ad-supported💎 IAP $4.99 per item
🔔
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📝 Description
95
BU Score · Transcendent
Full revenue analysis
Read the article-style breakdown for Diary Book - Journal With Lock: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
More by Lucidify Labs
View all →📦 Portfolio summaryINDIE studio
2apps·$1K/mocombined
Lead-app heavy — top app contributes 67%
About this analysis
Why medium confidence: 4,871 ratings · no founder-verified revenue (model estimate only).
❓ Frequently Asked Questions
4 answers · auto-generated from this app's public dataHow much does Diary Book - Journal With Lock make per month?▴
Based on our ML-calibrated revenue forecast, Diary Book - Journal With Lock earns approximately $831/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 Diary Book - Journal With Lock?▴
Browse the full Lifestyle 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 Diary Book - Journal With Lock?▴
Diary Book - Journal With Lock is published by Lucidify Labs 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 Diary Book - Journal With Lock's BU Score?▴
Diary Book - Journal With Lock 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.