RPN 28x Calc
63
Quality Score
Solid
RPN 28x Calc
Low confidence
✍️ bumetric analysis
“
RPN 28x Calc is an iOS app from tredje design in the Productivity category, currently rated 5.0★ across 33 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Quality Score is 63: 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
$2.4K
per month
→
12-mo forecast
$2.1K – $7.7K
per month
→
24-mo forecast
$2.0K – $17.8K
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
$55K
↳ What it cost to build · not monthly revenue
Likely range $40K – $75K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
📈
Pays back in ~6 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 |
| ⚙ Productivity complexity ×1.10 | +$5K |
Total estimate
$55K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$150K
↳ What it would sell for · not monthly revenue
Marketplace range $100K – $200K · 17× MRR multiple
💸
~2.7× 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 ≥ 4.7 (premium) | +15% |
| 🏷 Productivity category multiple | +8% |
| ⭐ Small user base (<1K ratings) | -8% |
Final multiple
17× MRR
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$2.4K/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
$2.1K – $4.9K
12 months
$2.1K – $7.7K
24 months
$2.0K – $17.8K
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 · 40/100INDIE TIERlimited signalRevenue Strength
3.4
Product Quality
4.0
Market Position
2.0
Growth Velocity
5.0
Defensibility
4.5
Operational Safety
7.0
Founder Strength
4.9
Monetization Maturity
1.0
- 💰 Revenue: Modest — $977 - $6110/mo · INDIE tier · medium confidence, trajectory unclear.
- ⭐ Quality: 5.0★ across 33 reviews — weak — significant quality concerns.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: ⚠ last update 1075d ago — possibly dormant.
- ⚠️ Risk: Moderate — dormant (1075d since update).
🎯 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 = $43K-$78K. Portfolio play ($8K/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 6 of 6 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Paid app ($6.99)METRIC | +$2,800 | |
| Excellent rating (5.0★)METRIC | +$2,200 | |
| excellent appREVIEW | +$1,500 | |
| Mature app (14y old)METRIC | +$1,500 | |
| Single-language (English only)METRIC | −$400 | |
| Pre-traction phase (33 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 · v3.5.4
- Prevents the assistant window from being hidden whan transitioning from Slide Over or Split View into Full Screen mode.
- Corrects the factorial of zero: 0! = 1.
- Corrects the factorial of zero: 0! = 1.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- RPN 28x Calc
- Developer
- tredje design
- Bundle ID
- se.tredje.Calculator
- App Store URL
- Open in App Store
- Category
- Productivity
- Content rating
- 4+
- Languages
- EN
Company
- Website
- Not found
- Tagline
- tredje design
- Description
- tredje design - Eric Roller. The official site of Eric Roller. Macintosh and iOS developer.
- Founded
- Not found
- HQ / Address
- Not found
- 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
- $8.7K/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.
⭐Recent App Store Reviews21 latest · avg 4.9★ · 90.5% 5★ · 0% 1★
5★19 (90%)
4★2 (10%)
3★0 (0%)
2★0 (0%)
1★0 (0%)
+0 ratings/week
Praise: great ×8 best ×5 love ×4 favorite ×2 awesome ×2Complaints: broken ×1
Top positive
★★★★★ I've been looking for a calculator app like this
I only recently discovered this app, so I'm just now digging into its very rich set of features. The Free42 & Plus42 calculators are amazing, but RPN 28x Calc shows what is possible when you ignore the "boundaries" that l…
★★★★★ No longer miss my 28S
I’m so impressed with this calculator. Thanks for creating this! Great attention to detail on the user interface.…
📈Ratings growth33 ratings+3200% lifetimeShow 3-year history estimate ▾
Tracked (24 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.
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
RPN 28x Calc is a programmable scientific calculator with a pleasingly classic look. Despite its nostalgic appearance, it offers a modern and intuitive user experience, allowing you to interact with your operands by touching them in the display.
It is a reverse-polish notation (RPN) calculator with a dynamic stack display. As you add more values to the stack, the display shown on an iPad automatically expands. To see more lines, simply swipe to scroll. You can also re-order the levels or modify any of the values on the stack.
-----… View full description on the official store →
It is a reverse-polish notation (RPN) calculator with a dynamic stack display. As you add more values to the stack, the display shown on an iPad automatically expands. To see more lines, simply swipe to scroll. You can also re-order the levels or modify any of the values on the stack.
-----… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 3 MB🔞 4+📱 iOS 12.4+🔖 v3.5.4🔄 updated 0d ago🌐 EN📂 Productivity💰 Paid
📅
What Worked™ · Development Pipeline
3 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 →
2026-04
💲
Went paid — introduced $6.99 price point
2020-08
📈
Crossed 10 ratings — social-proof flywheel kicking in
2013-01
🚀
First tracked snapshot — initial data captured
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇺🇸 US | 5★ | 33 | 5★ this version |
| 🇬🇧 GB | 5★ | 3 | 5★ this version |
| 🇩🇪 DE | 5★ | 8 | 5★ this version |
| 🇫🇷 FR | 5★ | 4 | 5★ this version |
| 🇯🇵 JP | 4.5★ | 2 | 4.5★ this version |
| 🇨🇦 CA | 5★ | 1 | 5★ this version |
| 🇦🇺 AU | 5★ | 1 | 5★ this version |
| 🇧🇷 BR | 5★ | 2 | 5★ this version |
| 🇮🇳 IN | 0★ | 0 | — |
🔔
Track this app’s revenue
FREEGet an email when revenue moves by your threshold. No spam, unsubscribe in one click.
📝 Description
95
BU Score · Transcendent
Similar apps in Productivity
About this analysis
Why low confidence: only 33 ratings · no founder-verified revenue (model estimate only) · revenue figure is directional only.
❓ Frequently Asked Questions
4 answers · auto-generated from this app's public dataHow much does RPN 28x Calc make per month?▴
Based on our ML-calibrated revenue forecast, RPN 28x Calc earns approximately $8.7K/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 RPN 28x Calc?▴
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 RPN 28x Calc?▴
RPN 28x Calc is published by tredje design 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 RPN 28x Calc's BU Score?▴
RPN 28x Calc 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.