Calca
66
Quality Score
Solid
Calca
Medium confidence
✍️ bumetric analysis
“
Calca is an iOS app from Krueger Systems, Inc. in the Productivity category, currently rated 4.5★ across 153 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Quality Score is 66: 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
💡 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
$70K
↳ What it cost to build · not monthly revenue
Likely range $50K – $95K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
📈
Pays back in ~4 months 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 |
| 📦 Asset bundle (78 MB) | +$11K |
| ⚙ Productivity complexity ×1.10 | +$6K |
Total estimate
$70K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$275K
↳ What it would sell for · not monthly revenue
Marketplace range $200K – $350K · 16× MRR multiple
💸
~3.9× return on build cost
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 ≥ 4.4 (solid) | +8% |
| 🏷 Productivity category multiple | +8% |
| ⭐ Small user base (<1K ratings) | -8% |
Final multiple
16× MRR
👥 Estimated audience size
11K
Lifetime downloads (US-equivalent)
Monthly active
3.3K
Daily active
1.4K
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
42% sticky
🔬
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
Below median · 49/100MID TIERunderperforming peersGrowth Velocity
5.0
Founder Strength
6.2
Product Quality
6.4
Revenue Strength
3.7
Monetization Maturity
1.0
Defensibility
6.0
Market Position
2.0
Operational Safety
9.0
- 💰 Revenue: Modest — $3K - $7K/mo · MID tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.55★ across 153 reviews — solid.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: last update 234d ago — slow cadence.
- ⚠️ 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 = $90K-$160K. Portfolio play ($35K/mo combined) commands premium.
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 9 of 9 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 | |
| Excellent rating (4.5★)METRIC | +$2,200 | |
| bugsREVIEW | −$1,800 | |
| 5 starREVIEW | +$1,800 | |
| excellent appREVIEW | +$1,500 | |
| Mature app (12y old)METRIC | +$1,500 | |
| highly recommendREVIEW | +$1,400 | |
| Early-stage install base (153 ratings)METRIC | +$400 | |
| Single-language (English only)METRIC | −$400 |
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 · v1.7.2
* New binary shift operators (like C's)
* More detailed reason if Apple Intelligence fails
* Fix toolbar colors when editing documents
* More detailed reason if Apple Intelligence fails
* Fix toolbar colors when editing documents
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Calca
- Developer
- Krueger Systems, Inc.
- Bundle ID
- com.kruegersystems.calca.ios
- App Store URL
- Open in App Store
- Category
- Productivity
- Content rating
- 4+
- Languages
- EN
Company
- Website
- Not found
- Tagline
- Calca - The Text Editor that Loves Math
- Description
- Calca is an advanced symbolic calculator for iOS, OS X, and Windows that's as easy to use as a text editor.
- Founded
- Not found
- HQ / Address
- 4556 University Way NE #220 Seattle, WA 98105 USA
- Employees
- Not found
- Logo
- Available
Revenue
- Verified revenue / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- ML model estimate / mo
- $16.7K/mo
- Top-grossing rank
- Outside top 100 in US Productivity
- 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 growth153 ratings+200% lifetimeShow 3-year history estimate ▾
Tracked (57 weeks) Pre-tracking estimate (37 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.
💰Pricing History$0.00 → $9.99 (+0%)
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
Calca is a powerful symbolic calculator that gives you instant answers as you type. It solves equations and simplifies complex expressions - it's a computer algebra system in your pocket! It's also a rich Markdown text editor so that you can explain your ideas alongside your calculations.
Calca is perfect for professionals and students - anyone who works with numbers and equations. Variables and functions can be created with only a few keystrokes and can be manipulated with a rich library of operators and functions.
Calca updates as you type - just like a spreadsheet.… View full description on the official store →
Calca is perfect for professionals and students - anyone who works with numbers and equations. Variables and functions can be created with only a few keystrokes and can be manipulated with a rich library of operators and functions.
Calca updates as you type - just like a spreadsheet.… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 78 MB🔞 4+📱 iOS 15.0+🔖 v1.7.2🔄 updated 0d ago🌐 EN📂 Productivity💰 Paid
📅
What Worked™ · Development Pipeline
7 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 →
2026-05
📈
Crossed 50 ratings — social-proof flywheel kicking in
2026-05
💲
Went paid — introduced $9.99 price point
2026-03
⭐
Rating ↑ 3.86 → 4.60 (improved 0.74★)
2022-10
📈
Crossed 100 ratings — social-proof flywheel kicking in
2014-12
📈
Crossed 50 ratings — social-proof flywheel kicking in
2013-07
📈
Crossed 10 ratings — social-proof flywheel kicking in
2013-07
🚀
First tracked snapshot — initial data captured
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇦🇺 AU | 4.55556★ | 27 | 4.55556★ this version |
| 🇧🇷 BR | 4.33333★ | 3 | 4.33333★ this version |
| 🇨🇦 CA | 4.61904★ | 21 | 4.61904★ this version |
| 🇩🇪 DE | 4.60526★ | 38 | 4.60526★ this version |
| 🇫🇷 FR | 4.27778★ | 18 | 4.27778★ this version |
| 🇬🇧 GB | 4.36842★ | 19 | 4.36842★ this version |
| 🇮🇳 IN | 4.83333★ | 6 | 4.83333★ this version |
| 🇯🇵 JP | 5★ | 6 | 5★ this version |
| 🇺🇸 US | 4.54901★ | 153 | 4.54901★ this version |
🔔
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📝 Description
95
BU Score · Transcendent
Full revenue analysis
Read the article-style breakdown for Calca: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
More by Krueger Systems, Inc.
View all →📦 Portfolio summaryINDIE studio
3apps·$35K/mocombined
✓ Diversified — top app contributes 48%; risk spread across portfolio
Similar apps in Productivity
About this analysis
Why medium confidence: 153 ratings · no founder-verified revenue (model estimate only).
❓ Frequently Asked Questions
4 answers · auto-generated from this app's public dataHow much does Calca make per month?▴
Based on our ML-calibrated revenue forecast, Calca earns approximately $16K/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 Calca?▴
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 Calca?▴
Calca is published by Krueger Systems, Inc. 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 Calca's BU Score?▴
Calca has a BU Score of 66/100 (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.