Guardian Monitor
53
Quality Score
Solid
Guardian Monitor
by Kacper Rychlinski
Low confidence
✍️ Bumetric analysis
“
Guardian Monitor is an iOS app from Kacper Rychlinski in the Education category, currently rated 4.0★ across 52 ratings. Initial signal reads as mostly critical sentiment so far: users flag rough edges and unmet expectations.
Quality Score is 53: Solid (established niche player). For a Education 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
$2.1K
per month
→
12-mo forecast
$1.8K – $6.7K
per month
→
24-mo forecast
$1.7K – $15.4K
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
40 snapshots on record
Rating
4.0
Reviews
52 reviews
Forecast Revenue / mo
$2.1K
Snapshots tracked
40
since Mar 2022
ONE-TIME · BUILD
💰 Estimated build cost
$90K
↳ What it cost to build · not monthly revenue
Likely range $70K – $120K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
📈
Pays back in ~3.6y at current MRR
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 |
| ⚙ Education complexity ×1.20 | +$10K |
| ⚙ 4.5y maintenance × ~1-person team | +$27K |
Total estimate
$90K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$35K
↳ What it would sell for · not monthly revenue
Marketplace range $25K – $45K · 16× MRR multiple
💸
~0.4× 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 |
| 📅 4.5y proven track record | +20% |
| ⭐ ★ rating 3.5-4.0 (mixed) | -8% |
| 🏷 Education category multiple | +6% |
| ⭐ Small user base (<1K ratings) | -8% |
Final multiple
16× MRR
🛠 Estimated tech stack
🍎
Native iOS (SwiftUI)
Medium confidence · 70%
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
| 📦 App bundle size | 36 MB |
| 🏷 Category context | Education |
| 📦 Small-mid iOS bundle | → Native SwiftUI (post-2020 era) |
💀 Maintenance status
Slowing
25%
Last shipped 2026-08-25 · 33 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
| 📅 33 days since last update | Healthy release cadence |
| 👥 Small user base (52 ratings) + 4.5y old | +10% (solo-project pattern) |
Verdict
Slowing
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$2.1K/mo · ML-estimated from 234 triggers
Growth rate
+6.0% MoM · INDIE tier baseline (compound monthly)
Direction
Headwinds: rating drift may slow acquisition
6 months
$1.8K – $4.2K
12 months
$1.8K – $6.7K
24 months
$1.7K – $15.4K
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
Pre-traction · 38/100INDIE TIERlimited signalGrowth Velocity
5.0
Founder Strength
3.0
Product Quality
3.2
Revenue Strength
3.3
Monetization Maturity
1.0
Defensibility
3.1
Market Position
2.0
Operational Safety
10.0
- 💰 Revenue: Modest — $846 - $5287/mo · INDIE tier · medium confidence, trajectory unclear.
- ⭐ Quality: 3.98★ across 52 reviews — weak — significant quality concerns.
- 📍 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 = $38K-$67K.
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 5 of 5 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Paid app ($0.00)METRIC | +$2,800 | |
| Multilingual (15 languages)METRIC | +$1,500 | |
| slowREVIEW | −$1,200 | |
| Established app (4y old)METRIC | +$800 | |
| Pre-traction phase (52 ratings)METRIC | −$300 |
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.
🆕 What's New · v1.7.0
- Support for MiniMed Flex and the Instinct sensor: active insulin and infusion set status
- Live Activity: alarm, voice reading and snooze right from the Lock Screen
- Polished interface details, bug fixes and battery usage optimization
- Live Activity: alarm, voice reading and snooze right from the Lock Screen
- Polished interface details, bug fixes and battery usage optimization
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Guardian Monitor
- Developer
- Kacper Rychlinski
- Bundle ID
- pl.krychlinski.diabetes.GuardianMonitor
- App Store URL
- Open in App Store
- Category
- Education
- Content rating
- 4+
- Languages
- CS, NL, EN, FI, FR, DE, HU, IT, PL, PT, RU, ES, SV, ZH, TR
Company
- Website
- Not found
- Tagline
- Today
- Description
- Find apps and games for iPhone, iPad, Mac, and more on the App Store.
- Founded
- Not found
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- Available
Revenue
- Reported revenue signal / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- Model estimate / mo
- $2.1K/mo
- Top-grossing rank
- Outside top 100 in US Education
- 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.
📈Ratings growth52 ratings+5100% lifetimeShow 3-year history estimate ▾
Tracked (40 weeks) Pre-tracking estimate (0 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
🚀Update Frequency · Releases per Quarter3 releases tracked
🚀Version Release Timeline3 releases tracked
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
Note: This app is for informational purposes only and should not be used to make medical decisions.
Guardian Monitor displays glucose data from supported CGM services without modifying any settings in the original app.
To use the app, you need an account with the original CGM service, as authorization is required for it to function.
Guardian Monitor enhances standard functionality with additional features such as a custom alarm system and voice readouts of glucose levels.
It can also run in the background by playing a standby sound that turns into an alarm when necessary.… View full description on the official store →
Guardian Monitor displays glucose data from supported CGM services without modifying any settings in the original app.
To use the app, you need an account with the original CGM service, as authorization is required for it to function.
Guardian Monitor enhances standard functionality with additional features such as a custom alarm system and voice readouts of glucose levels.
It can also run in the background by playing a standby sound that turns into an alarm when necessary.… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 36 MB🔞 4+📱 iOS 15.0+🔖 v1.7.0🔄 updated 1mo ago🌐 CS, NL, EN, FI, FR +10📂 Education💰 Free🚀 Launched 2022 (4y old)
📅
What Worked™ · Development Pipeline
11 EVENTS TRACKEDDetected changes in this app over its tracked lifetime — each event links cause (what changed) to effect (what moved). Sorted newest first.See full history →Version history →
2026-09
📸
Refreshed store screenshots — 11 of 11 updated
2026-08
🔧
Shipped update — v1.6.6 → v1.7.0
2026-05
🔧
Shipped update — v1.6.5 → v1.6.6
2026-05
📈
Crossed 50 ratings — social-proof flywheel kicking in
2026-05
🔄
Monetization changed: paid → free
2026-03
⭐
Rating ↑ 3.59 → 3.93 (improved 0.34★)
2022-04
📈
Crossed 10 ratings — social-proof flywheel kicking in
→ 30 days after: rating +0.13★ high confidence
2022-04
⭐
Rating ↓ 5.00 → 4.20 (dropped 0.80★)
→ 30 days after: rating +0.13★ high confidence
2022-04
⭐
Rating ↓ 4.43 → 4.00 (dropped 0.43★)
→ 30 days after: rating −0.80★ · reviews +9 medium · co-occurring
2022-04
⭐
Rating ↓ 5.00 → 3.67 (dropped 1.33★)
→ 30 days after: rating −0.80★ · reviews +9 medium · co-occurring
2022-03
🚀
First tracked snapshot — initial data captured
→ 30 days after: rating −0.80★ · reviews +9 high confidence
📸
Store Page History
11 SCREENSHOT CHANGESEvery time a developer swaps a store screenshot we archive both versions. Compare side-by-side to see what messaging / visuals changed.
iPad screenshots
Slot 1
2 ver.
2 ver.
2026-08-06
2026-09-05
Slot 2
2 ver.
2 ver.
2026-08-06
2026-09-05
Slot 3
2 ver.
2 ver.
2026-08-06
2026-09-05
Slot 4
2 ver.
2 ver.
2026-08-06
2026-09-05
Slot 5
2 ver.
2 ver.
2026-08-06
2026-09-05
iPhone screenshots
Slot 1
2 ver.
2 ver.
2026-08-06
2026-09-05
Slot 2
2 ver.
2 ver.
2026-08-06
2026-09-05
Slot 3
2 ver.
2 ver.
2026-08-06
2026-09-05
Slot 6
2 ver.
2 ver.
2026-08-06
2026-09-05
Slot 7
2 ver.
2 ver.
2026-08-06
2026-09-05
Slot 8
2 ver.
2 ver.
2026-08-06
2026-09-05
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇦🇺 AU | 3.875★ | 16 | 3.875★ this version |
| 🇧🇷 BR | 4.25★ | 8 | 4.25★ this version |
| 🇨🇦 CA | 3.25★ | 4 | 3.25★ this version |
| 🇩🇪 DE | 3.96774★ | 31 | 3.96774★ this version |
| 🇫🇷 FR | 3.28571★ | 7 | 3.28571★ this version |
| 🇬🇧 GB | 4.2381★ | 21 | 4.2381★ this version |
| 🇮🇳 IN | 0★ | 0 | — |
| 🇯🇵 JP | 4.38095★ | 21 | 4.38095★ this version |
| 🇺🇸 US | 4.05263★ | 57 | 4.05263★ this version |
🔔
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📝 Description
95
BU Score · Transcendent
About this analysis
Why low confidence: only 52 ratings · no founder-verified revenue (model estimate only) · revenue figure is directional only.
❓ Frequently Asked Questions
9 answers · auto-generated from this app's public dataHow much does Guardian Monitor make per month?▴
Based on our ML-calibrated revenue forecast, Guardian Monitor earns approximately $2.1K/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 Guardian Monitor profitable?▴
With estimated build cost $90K and monthly revenue $2.1K, Guardian Monitor looks slow ROI — payback period is around 3.6 years at the current run-rate. Profitability also depends on paid-acquisition spend and refund rate which the public model doesn't see.
What apps are like Guardian Monitor?▴
Browse the full Education 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 Guardian Monitor built with?▴
Our heuristic places Guardian Monitor on the Native iOS (SwiftUI) stack (Medium confidence, 70%). Signals: app bundle size, category context, store-description markers, release-date era. We don't disassemble binaries. Alternative possibilities: Flutter.
Is Guardian Monitor still actively maintained?▴
Maintenance status: Slowing (25% abandonment risk). Last shipped version was 1 months ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.
How much would Guardian Monitor sell for?▴
Estimated acquisition value: $35K (marketplace range $25K – $45K). Calculated as 16× 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 Guardian Monitor last updated?▴
Guardian Monitor last shipped a new version on 2026-08-25 — 1 months ago. This is the date Apple / Google last accepted a new build, not a content-only push.
Who makes Guardian Monitor?▴
Guardian Monitor is published by Kacper Rychlinski on the Apple App 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 Guardian Monitor's BU Score?▴
Guardian Monitor has a BU Score of 53/100 (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.